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Oxidation behavior of C/C composites with SiC/ZrSiO_4-SiO_2 coating 认领 引用 被引量：6
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作者 李杨 肖鹏 +2 位作者 李专 罗威 周伟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第2期397-405,共9页
A SiC/ZrSiO4？SiO2 （SZS） coating was successfully fabricated on the carbon/carbon （C/C） composites by pack cementation, slurry painting and sintering to improve the anti-oxidation property and thermal shock resist... A SiC/ZrSiO4？SiO2 （SZS） coating was successfully fabricated on the carbon/carbon （C/C） composites by pack cementation, slurry painting and sintering to improve the anti-oxidation property and thermal shock resistance. The anti-oxidation properties under different oxygen partial pressures （OPP） and thermal shock resistance of the SZS coating were investigated. The results show that the SZS coated sample under low OPP, corresponding to the ambient air, during isothermal oxidation was 0.54% in mass gain after 111 h oxidation at 1500 ° C and less than 0.03% in mass loss after 50 h oxidation in high OPP, corresponding to the air flow rate of 36 L/h. Additionally, the residual compressive strengths （RCS） of the SZS coated samples after oxidation for 50 h in high OPP and 80 h in low OPP remain about 70% and 72.5% of those of original C/C samples, respectively. Moreover, the mass loss of SZS coated samples subjected to the thermal cycle from 1500 ° C in high OPP to boiling water for 30 times was merely 1.61%. 展开更多
关键词 C/C composite SiC/ZrSiO4-SiO2 coating oxygen partial pressure anti-oxidation thermal shock residual compressive strength
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Application of CO_2-TPD in the Synthesis of Composite Oxides from Metal-Organic Precursors 认领 引用 被引量：2
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作者 Zong Ping SHAO Hui DONG +1 位作者 Guo Xing XIONG Wei Shen YANG 《Chinese Chemical Letters》 SCIE CAS 2000年第6期561-564,共4页
CO2-TPD was demonstrated an effective way to investigate the phase formation during pyrolysis for the preparation of composite oxides using metal-organic molecules as precursors.Based on the CO2-TPD results, it was fo... CO2-TPD was demonstrated an effective way to investigate the phase formation during pyrolysis for the preparation of composite oxides using metal-organic molecules as precursors.Based on the CO2-TPD results, it was found that calcination condition had deep effect on the carbonate formation and the minimum firing temperature to acquire pure phase composite oxide.An optimized calcination schedule was then developed. 展开更多
关键词 CO_2-TPD composite oxide synthesis metal-organic precursors
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Study on the Different Photocatalytic Performances for Tetracycline Hydrochloride Degradation of p-block Metal Composite Oxides Sr1.36Sb2O_6 and Sr2Sb2O_7 认领 引用 被引量：1
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作者 HUANG Yi-Wei MAO Jing-Yun +2 位作者 QIAN Qing-Rong XUE Hun LIU Yan-Ru 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2021年第3期394-402,275,共9页
p-block metal composite oxides Sr1.36Sb2O6 and Sr2Sb2O7 synthesized by a hydrothermal method as photocatalysts in the degradation of tetracycline hydrochloride under UV light irradiation have been ex... p-block metal composite oxides Sr1.36Sb2O6 and Sr2Sb2O7 synthesized by a hydrothermal method as photocatalysts in the degradation of tetracycline hydrochloride under UV light irradiation have been extensively studied.The effects of synthesis conditions on the photocatalytic activity were discussed.The Sr1.36Sb2O6-100°C-24 h-5 and Sr2Sb2O7-150℃-24 h-2 samples prepared under optimal conditions exhibited remarkably different photocatalytic activities.The essential factors influencing the difference of photocatalytic performance were revealed.The results showed that the different photocatalytic activities observed for Sr1.36Sb2O6and Sr2Sb2O7 could be attributed to their different electronic and crystal structures.Our work will provide a new perspective for the screening and design of p-block metal composite oxide photocatalysts to enhance the removal of organic pollutants in the environment. 展开更多
关键词 p-block metal composite oxide Sr1.36Sb2O6 Sr2Sb2O7 photocatalytic tetracycline hydrochloride
Preparation and oxidation property of ZrB_2-MoSi_2/SiC coating on carbon/carbon composites 认领 引用 被引量：19
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作者 张武装 曾毅 +2 位作者 GBOLOGAH Lemuel 熊翔 黄伯云 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1538-1544,共7页
To improve the oxidation resistance of carbon/carbon composites,ZrB2-MoSi2/SiC coating on the carbon/carbon substrate was prepared.The inner coating of SiC was prepared by pack cementation and the outer coating of ZrB... To improve the oxidation resistance of carbon/carbon composites,ZrB2-MoSi2/SiC coating on the carbon/carbon substrate was prepared.The inner coating of SiC was prepared by pack cementation and the outer coating of ZrB2-MoSi2 was prepared by slurry painting.The phase compositions and microstructures of the coating were characterized by XRD and SEM,respectively.The preparation and the high temperature oxidation property of the coated composites were investigated.The results show that the outer coating of carbon/carbon composites is composed of ZrB2,MoSi2 and SiC phases.The mass losses of the ZrB2-MoSi2/SiC coated samples with SiC nano-whiskers after 30 h and 10 h of oxidation at 1 273 K and 1 773 K were,respectively,5.3% and 3.0%.The ZrB2-MoSi2/SiC coated samples exhibit self-sealing performance and good oxidation resistance at high temperature. 展开更多
关键词 carbon/carbon composites ZrB2-MoSi2 SiC coating oxidation
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基于宏观润滑−微观位错协同机制ZrB2/TiO2复合膜层的高温摩擦学性能 认领 引用
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作者 宁炳坤 倪培全 +4 位作者 谢天祥 钱伟峰 常敬 陈永楠 王楠 《中国有色金属学报》 EI CAS CSCD 北大核心 2026年第6期2325-2337,共13页
为了改善钛合金的高温摩擦学性能,采用微弧氧化技术通过调控电解液硼源浓度,在TC4钛合金表面制备了不同ZrB2含量的ZrB2/TiO2复合膜层(B3、B5、B7),系统研究了复合膜层在200℃、400℃和600℃条件下的摩擦磨损行为,揭示了ZrB_(2... 为了改善钛合金的高温摩擦学性能,采用微弧氧化技术通过调控电解液硼源浓度,在TC4钛合金表面制备了不同ZrB2含量的ZrB2/TiO2复合膜层(B3、B5、B7),系统研究了复合膜层在200℃、400℃和600℃条件下的摩擦磨损行为,揭示了ZrB2含量对复合膜层高温摩擦学性能的影响规律及自润滑机制。结果表明:随着摩擦温度升高,复合膜层中的ZrB2逐渐氧化生成B2O3玻璃相和ZrO2,其中B2O3在摩擦界面铺展形成连续润滑薄膜。B5膜层在200~600℃宽温域范围内均表现出最优异的减摩耐磨性能,200℃、400℃、600℃时复合膜层的摩擦因数较传统PEO膜层的分别降低了61.5%、69.1%和58.8%,B5膜层在200℃的磨痕深度最浅且磨损最轻微。这主要是由于B5膜层实现了力学性能与自润滑性能的最佳平衡,适量ZrB2的添加既提供了足够的初始硬度以承载载荷,又能在高温摩擦过程中持续、稳定地释放B2O3润滑相。分子动力学模拟结果表明,B5膜层的应变分布最为均匀,位错演化过程最为稳定。过量添加ZrB2导致膜层结构均匀性下降,高温下氧化剧烈、硬度衰减严重,从而降低了耐磨性能。本文为钛合金高温耐磨表面处理技术的发展提供了参考。 展开更多
关键词 微弧氧化 ZrB2/TiO2复合膜层 高温摩擦学 自润滑 分子动力学模拟
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Preparation and characterization of ZrO_2/TiO_2 composite photocatalytic film by micro-arc oxidation 认领 引用 被引量：9
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作者 罗强 蔡启舟 +4 位作者 李欣蔚 潘振华 李玉洁 陈喜娣 严青松 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期2945-2950,共6页
ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr（OH）4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope （... ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr（OH）4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope （SEM）, energy dispersive X-ray （EDX）, X-ray diffraction （XRD） and ultraviolet-visible （UV-Vis） spectrophotometer. The composite film shows a lamellar and porous structure which consists of anatase, futile and ZrO2 phases. The optical absorption edge of film is shifted to longer wavelength when ZrO2 is introduced to TiO2. Furthermore, the photocatalytic reaction rate constants of degradation of rhodamine B solution with ZrO2/TiO2 composite film and pure TiO2 film under ultraviolet irradiation are measured as 0.0442 and 0.0186 h 1, respectively. 展开更多
关键词 pure titanium micro-arc oxidation Zr（OH）4 colloidal particle ZrO2/TiO2 composite photocatalytic film
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SiC-MoSi_2/ZrO_2-MoSi_2 coating to protect C/C composites against oxidation 认领 引用 被引量：8
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作者 付前刚 张佳平 +2 位作者 张正中 李贺军 孙粲 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2113-2117,共5页
To improve the oxidation resistance of carbon/carbon （C/C） composites in air at high temperatures, a SiC- MoSi2/ZrO2-MoSi2 coating was prepared on the surface of C/C composites by pack cementation and slurry method.... To improve the oxidation resistance of carbon/carbon （C/C） composites in air at high temperatures, a SiC- MoSi2/ZrO2-MoSi2 coating was prepared on the surface of C/C composites by pack cementation and slurry method. The microstructures and phase compositions of the coated C/C composites were analyzed by scanning electron microscopy and X-ray diffraction, respectively. The result shows that the SiC-MoSi2/ZrO2-MoSi2 coating is dense and crack-free with a thickness of 250-300 μm. The preparation and the high temperature oxidation property of the coated composites were investigated. The as-received coating has excellent oxidation protection ability and can protect C/C composites from oxidation for 260 h at 1773 K in air. The excellent anti-oxidation performance of the coating is considered to come from the formation of ZrSiO4, which improves the stability of the coating at high temperatures. 展开更多
关键词 carbon/carbon composites SiC-MoSi2/ZrO2-MoSi2 coating oxidation resistance
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High temperature oxidation and ablation behaviors of HfB2-SiC/SiC coatings for carbon/carbon composites fabricated by dipping-carbonization assisted pack cementation 认领 引用 被引量：7
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作者 Lei Zhou Jiaping Zhang +5 位作者 Dou Hu Qiangang Fu Wuqing Ding Jiaqi Hou Bing Liu Mingde Tong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第16期88-98,共11页
To improve the uniformity and the content of HfBin Hf B-Si-based ceramic coating and alleviate the damage of substrate,and then enhance the high-temperature(1700°C)oxidation and cyclic ablation resistances of car... To improve the uniformity and the content of HfBin Hf B-Si-based ceramic coating and alleviate the damage of substrate,and then enhance the high-temperature(1700°C)oxidation and cyclic ablation resistances of carbon/carbon composites,a close-knit double layer HfB2-SiC/SiC coatings with a mosaic structure and high content of HfBwere prepared by a novel dipping-carbonization assisted pack cementation methods(DPC–HS/S).In contrast,a HfB2-SiC/SiC coatings were also fabricated by pack cementation(PC–HS/S).Results revealed that the oxidation and ablation protective performances of the DPC–HS/S coatings were superior to those of PC–HS/S coatings.After 30 thermal cycles between 1500°C and room temperature,the mass gain of the coated sample was 0.78%,and the mass loss was 1.65%after oxidation at 1700°C for 156 h.Moreover,under an oxyacetylene torch ablation for 180 s(3 cycles),the linear ablation rate of the DPC–HS/S coated specimen was 1.62μm/s,which was much lower than that of PC–HS/S coated specimen(3.08μm/s). 展开更多
关键词 C/C composites HfB2 Oxidation resistance Cyclic ablation resistance
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Morphology and Frictional Characteristics Under Electrical Currents of Al_2O_3/Cu Composites Prepared by Internal Oxidation 认领 引用 被引量：10
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作者 刘瑞华 宋克兴 +3 位作者 贾淑果 徐晓峰 郜建新 国秀花 《Chinese Journal of Aeronautics》 SCIE EI CAS 2008年第3期281-288,共8页
Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and coppe... Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and copper against brass are investigated and compared. The changes in morphology of the sliding surface and subsurface are examined with scanning electron microscope （SEM） and energy dispersive X-ray spectrum （EDS）. The results show that the wear resistance of the Al2O3/Cu composites is superior to that of copper under the same conditions, Under a given electrical current, the wear rate of Al2O3/Cu composites decreases as the Al2O3-content increases, However, the wear rates of the Al2O3/Cu composites and copper increase as the sliding speed and pressure increase under dry sliding condition. The main wear mechanisms for Al2O3/Cu composites are of abrasion and adhesion; for copper, it is adhesion, although wear by oxidation and electrical erosion can also be observed as the speed and pressure rise. 展开更多
关键词 Al2O3/Cu composite internal oxidation friction and wear surface morphology current carder
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C/SiC/MoSi_2-SiC-Si multilayer coating for oxidation protection of carbon/carbon composites 认领 引用 被引量：5
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作者 张雨雷 李贺军 +2 位作者 胡志雄 李克智 张磊磊 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2118-2122,共5页
C/SiC/MoSi2-SiC-Si oxidation protective multilayer coating for carbon/carbon （C/C） composites was prepared by pack cementation and slurry method. The microstructure, element distribution and phase composition of the... C/SiC/MoSi2-SiC-Si oxidation protective multilayer coating for carbon/carbon （C/C） composites was prepared by pack cementation and slurry method. The microstructure, element distribution and phase composition of the as-received coating were analyzed by scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDS） and X-ray diffraction （XRD）. The results show that the multilayer coating was composed of MoSi2, SiC and Si. It could effectively protect C/C composites against oxidation for 200 h with the mass loss of 3.25% at 1873 K in static air. The mass loss of the coated C/C composites results from the volatilization of SiO2 and the formation of cracks and bubble holes in the coating. 展开更多
关键词 C/C composites C/SiC MoSi2 SiC multilayer coating oxidation
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One dimensional CeO2 nanorods/poly(ethylene oxide) solid composite electrolyte for all-solid-state lithium-ion batteries 认领 引用 被引量：6
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作者 Yudi Guo Erqing Zhao +1 位作者 Xiaofang Zhao Shuailei Liu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2024年第3期570-577,I0005,共8页
The research of poly(ethylene oxide)(PEO)-based solid composite electrolyte with high ionic conductivity and excellent interfacial stability is the key to the development of all-solid-state lithium-ion batteries(ASSLI... The research of poly(ethylene oxide)(PEO)-based solid composite electrolyte with high ionic conductivity and excellent interfacial stability is the key to the development of all-solid-state lithium-ion batteries(ASSLIBs). Herein, uniform nanorod structured CeO2 fillers were controllably synthesized by electrospinning, which were subsequently filled into PEO polymer to prepare CeO2/PEO solid composite electrolyte. The addition of CeO2 nanorods can reduce both the glass transition temperature and the melting point of PEO polymer, and also interact with PEO and lithium bis(trifluoromethanesulphonyl)imide(LITFSI) by Lewis acid—base reaction. Therefore, the solid composite electrolyte exhibits a high ionic conductivity of 4.52 × 10-4S/cm, a wide electrochemical stability window of about 4.8 V, and a good interfacial stability with Li at 55℃. Moreover, the LiFePO_4/Li ASSLIB divulges the discharging specific capacity of 165, 162, 156 and 146 mA,h/g at 0.2, 0.5, 1 and 2 C, respectively, and achieves the capacity retention of 90.3% after 150 cycles at 0.5 C. Consequently, one dimensional CeO2 nanorods can be considered as an alternative filler for polymeric solid electrolyte. 展开更多
关键词 Poly(ethylene oxide) Solid composite electrolyte CeO2nanorods Ionic conductivity Rare earths
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Oxidation of Al_2O_3-30%TiCN-0.2%Y_2O_3 Composite 认领 引用 被引量：3
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作者 李喜坤 邱关明 +3 位作者 修稚萌 孙旭东 严长浩 代少俊 《Journal of Rare Earths》 SCIE EI CAS 2005年第3期276-279,共4页
The oxidation behavior of Al2O3-30%TiCN-0.2%Y2O3 composite and its effect on high temperature bending strength was studied. The result indicates that the mass gain during static oxidation of the material under normal ... The oxidation behavior of Al2O3-30%TiCN-0.2%Y2O3 composite and its effect on high temperature bending strength was studied. The result indicates that the mass gain during static oxidation of the material under normal atmosphere follows the parabolic law. Oxide increases with increasing temperature and prolonging time. It has good oxidation resistance. The product of oxidation of the material is TiO2. Therefore, the volume of the material expands. The oxide film is destroyed because residual stress inside the oxide film is released. Proper oxidation is beneficial to the improvement of bending strength of Al2O3-30%TiCN-0.2%Y2O3 composite. The strength increase is up to 4.5%. 展开更多
关键词 composite Al2O3-30%TiCN-0.2%Y2O3 oxidation behavior bend strength parabolic law residual stress rare earths
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Preparation of Al_2O_3/Au nano-laminated composite coatings and their oxidation resistance on stainless steel 认领 引用 被引量：3
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作者 高俊国 陆峰 +2 位作者 汤智慧 王长亮 何业东 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2491-2497,共7页
Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employ... Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employed to investigate the oxidation resistance of the composite coatings. The results revealed that the applied Al2O3/Au nano-laminated composite coatings improved the oxidation and spallation resistance of the stainless steel substrate significantly. The mechanism accounting for oxidation resistance was related with the suppression of inward oxygen diffusion and selective oxidation of Cr in the substrate. The mechanism accounting for spallation resistance was attributed to the relaxation of thermal stress by the nano-laminated structure. 展开更多
关键词 Al2O3/Au composite coatings magnetron sputtering oxidation resistance spallation resistance
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Effect of La_2O_3/Ce O_2 particle size on high-temperature oxidation resistance of electrodeposited Ni-La_2O_3/Ce O_2 composites 认领 引用 被引量：3
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作者 孟君晟 吉泽升 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3571-3577,共7页
Ni-La2O3/CeO2 composite films were prepared by electrodeposition from a nickel sulfate bath containing certain content of micrometer and nanometer La2O3/CeO2 particles. The effect of La2O3 or CeO2 particle size on the... Ni-La2O3/CeO2 composite films were prepared by electrodeposition from a nickel sulfate bath containing certain content of micrometer and nanometer La2O3/CeO2 particles. The effect of La2O3 or CeO2 particle size on the oxidation resistance of the electrodeposited Ni-La2O3/CeO2 composites in air at 1000 °C was studied. The results indicate that, compared with the electrodeposited Ni-film, Ni-La2O3/CeO2 composites exhibit a superior oxidation resistance due to the codeposited La2O3 or CeO2 particles blocking the outward diffusion of nickel. Moreover, compared with nanoparticles, La2O3 or CeO2 microparticles have stronger effect because La2O3 or CeO2 microparticles also act as a diffusion barrier layer at the onset of oxidation. 展开更多
关键词 Ni-based composite electrodeposition high-temperature oxidation La2O3 CeO2 reactive element effect oxidation mechanism
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Comparative investigation of microstructure and high-temperature oxidation resistance of high-velocity oxy-fuel sprayed CoNiCrAlY/nano-Al2O3 composite coatings using satellited powders 认领 引用 被引量：7
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作者 Pejman Zamani Zia Valefi 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第9期1779-1791,共13页
Satellited CoNiCrAlY–Al2O3feedstocks with 2wt%, 4wt%, and 6wt% oxide nanoparticles and pure CoNiCrAlY powder were deposited by the high-velocity oxy fuel process on an Inconel738 superalloy substrate. The oxida... Satellited CoNiCrAlY–Al2O3feedstocks with 2wt%, 4wt%, and 6wt% oxide nanoparticles and pure CoNiCrAlY powder were deposited by the high-velocity oxy fuel process on an Inconel738 superalloy substrate. The oxidation test was performed at 1050℃ for 5, 50, 100,150, 200, and 400 h. The microstructure and phase composition of powders and coatings were characterized by scanning electron microscopy and X-ray diffraction, respectively. The bonding strength of the coatings was also evaluated. The results proved that with the increase in the percentage of nanoparticles(from 2wt% to 6wt%), the amount of porosity(from 1vol% to 4.7vol%), unmelted particles, and roughness of the coatings(from 4.8 to 8.8 μm) increased, and the bonding strength decreased from 71 to 48 MPa. The thicknesses of the thermally grown oxide layer of pure and composite coatings(2wt%, 4wt%, and 6wt%) after 400 h oxidation were measured as 6.5, 5.5, 7.6, and 8.1 μm, respectively.The CoNiCrAlY–2wt% Al2O3coating showed the highest oxidation resistance due to the diffusion barrier effect of well-dispersed nanoparticles. The CoNiCrAlY–6wt% Al2O3coating had the lowest oxidation resistance due to its rough surface morphology and porous microstructure. 展开更多
关键词 MCrAlY coating CoNiCrAlY-Al2O3composite satellited feedstock microstructure high-temperature oxidation high-velocity oxy-fuel spraying
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Oxidation Resistance of In Situ Reaction/Hot Pressing Synthesized Ti2AlC-20%TiB2 Composite at 600-900℃in Air 认领 引用 被引量：1
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作者 Wenting Wang Jingjun Xu +4 位作者 Jun Zuo Ke Ma Yang Li Guangqi He Meishuan Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2024年第4期739-748,共10页
The oxidation behavior and kinetics of Ti2AlC-20vol.%TiB2 composite at 600-900℃ in air were investigated.The results showed that the oxidation kinetics of the composite followed a logarithmic law within the giv... The oxidation behavior and kinetics of Ti2AlC-20vol.%TiB2 composite at 600-900℃ in air were investigated.The results showed that the oxidation kinetics of the composite followed a logarithmic law within the given temperature range,which indicated that the composites had excellent oxidation resistance.The selective oxidation of Al in Ti2AlC was greatly enhanced,which facilitated the formation of a continuous and dense protective layer of Al2O3.Meanwhile,the existence of molten B2O3 inhibited the outward diffusion of Ti and inward diffusion of oxygen,which prevented the growth of anatase TiO2 at 600℃ and rutile TiO2 at 700-900℃.Therefore,the incorporation of TiB2 completely inhibited the abnormally rapid oxidation of bulk Ti2AlC at 600℃ and improved its oxidation resistance at 700-900℃. 展开更多
关键词 MAX phase Ti2AlC-TiB2composite Intermediate temperature oxidation Oxidation kinetics
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Properties of TiO_2-SiO_2 Mixed Oxides and Photocatalytic Oxidation of Heptane and Sulfur Dioxide 认领 引用 被引量：3
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作者 XIEChao XUZi-li YANGQiu-jing LINa WANGDe-bao DUYao-guo 《Chemical Research in Chinese Universities》 SCIE EI CAS 2005年第1期48-52,共5页
A series of TiO 2-XSiO 2[X denotes the molar fraction(%) of silica in the mixed oxides] with different \{n(Ti)\}(Si) ratios was prepared with ammonia water as a hydrolysis catalyst. The photocatalysts prepared were ch... A series of TiO 2-XSiO 2[X denotes the molar fraction(%) of silica in the mixed oxides] with different \{n(Ti)\}(Si) ratios was prepared with ammonia water as a hydrolysis catalyst. The photocatalysts prepared were characterized by XRD, thermal analysis, FTIR, UV-Vis and SPS. The characterization results of FTIR and UV-Vis spectra show that Ti atoms were gradually changed from octahedral coordination to tetrahedral coordination with the addition of silica, which is not beneficial for obtaining strong Brnsted acidity and higher photocatalytic activity. The photocatalytic activity experiments, which were conducted by using heptane(or SO 2) as the model reactant, showed that TiO 2-SiO 2 containing a suitable amount of silica can exhibit much higher photocatalytic activity than pure TiO 2. The enhanced photocatalytic activity can be attributed to three following factors: (1) smaller crystalline size; (2) higher thermal stability; (3) the new strong Brnsted acidity. 展开更多
关键词 TiO 2-SiO 2 mixed oxide Basic hydrolysis Photocatalytic oxidation
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Bimetallic NixFe2-xP cocatalyst with tunable electronic structure for enhanced photocatalytic benzyl alcohol oxidation coupled with H2evolution over red phosphorus 认领 引用 被引量：1
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作者 Shuang Li Haili Lin +5 位作者 Xuemei Jia Xin Jin Qianlong Wang Xinyue Li Shifu Chen Jing Cao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第3期363-377,共15页
Although bimetallic phosphide cocatalysts have attracted considerable interest in photocatalysis research owing to their advantageous thermodynamic characteristics,superstable and efficient cocatalysts have rarely bee... Although bimetallic phosphide cocatalysts have attracted considerable interest in photocatalysis research owing to their advantageous thermodynamic characteristics,superstable and efficient cocatalysts have rarely been produced through the modulation of their structure and composition.In this study,a series of bimetallic nickel-iron phosphide(NixFe2-xP,where 0<x<2)cocatalysts with controllable structures and overpotentials were designed by adjusting the atomic ratio of Ni/Fe onto nonmetallic elemental red phosphorus(RP)for the photocatalytic selective oxidation of benzyl alcohol(BA)coupled with hydrogen production.The catalysts exhibited an outstanding photocatalytic activity for benzaldehyde and a high H2yield.The RP regulated by bimetallic phosphide cocatalysts(NixFe2-xP)demonstrated higher photocatalytic oxidation-reduction activity than that regulated by monometallic phosphide cocatalysts(Ni2P and Fe2P).In particular,the RP regulated by Ni1.25Fe0.75P exhibited the best photocatalytic performance.In addition,experimental and theoretical calculations further illustrated that Ni1.25Fe0.75P,with the optimized electronic structure,possessed good electrical conductivity and provided strong adsorption and abundant active sites,thereby accelerating electron migration and lowering the reaction energy barrier of RP.This finding offers valuable insights into the rational design of highly effective cocatalysts aimed at optimizing the photocatalytic activity of composite photocatalysts. 展开更多
关键词 Bimetallic phosphides cocatalyst Composition regulation Red phosphorus Selective oxidation of benzyl alcohol H2
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Oxidation Behavior of Fe26Cr1Mo Stainless Steel in the Presence of Ni-La_2O_3 Electrodeposited Composite Film 认领 引用
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作者 彭晓 周龙江 +1 位作者 李铁藩 吴维岁 《Journal of Rare Earths》 SCIE EI CAS 1997年第3期36-41,共6页
The oxidation behaviors of Fe26Cr1Mo with and without the Ni La 2O 3 electrodeposited composite film have been investigated by thermogravimetric analysis (TGA) and a scanning electron microscope equipped with an energ... The oxidation behaviors of Fe26Cr1Mo with and without the Ni La 2O 3 electrodeposited composite film have been investigated by thermogravimetric analysis (TGA) and a scanning electron microscope equipped with an energy dispersive analytical X ray system(SEM/EDAX). The experimental results show that the oxide scale growing on Fe26Cr1Mo exposed at 900 ℃ spalled severely during cooling, while after the stainless steel was coated with the Ni La 2O 3 electrodeposited composite film, its high temperature cyclic oxidation resistance was significantly improved. The reason is that a La 2O 3 modified NiO scale, which has a superior adhesion to the substrate, was formed on the Fe26Cr1Mo stainless steel coated with Ni La 2O 3 composite film. 展开更多
关键词 Rare earths La Ni La 2O 3 electrodeposited composite film Stainless steel Oxidation behavior
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Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
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作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a nat... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2O 3-SiO 2-TiO 2-ZrO 2 composite ceramic membranes surface nanoscale topography microstructure
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