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EFFECTS OF Pb COMPOUND ADDITIVES ON THE PROPERTIES OF YBa_2Cu_3O7-δ 认领 引用 被引量：9
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作者 F.H.Li Z.G.Fan +3 位作者 J.Wang C.S.Liu D.W.Soh Y.J.Cho 《Acta Metallurgica Sinica(English Letters)》 EI CAS 2005年第2期145-148,共4页
The melting temperature and critical transition temperature Tc of YBa2Cu3O7-δ with deferent content additives of PbO and BaPbO3 were studied. When PbO was doped in YBa2Cu3O7-δ, the melting temperature of YBa2Cu3O7-... The melting temperature and critical transition temperature Tc of YBa2Cu3O7-δ with deferent content additives of PbO and BaPbO3 were studied. When PbO was doped in YBa2Cu3O7-δ, the melting temperature of YBa2Cu3O7-δ was reduced, however its superconductivity was weakened. From the XRD pattern of the sintered mixture of YBa2Cu3O7-δ and PbO, it was known that there was a reaction between YBa2Cu3O7-δ and PbO, and the product was BaPbO3. Hence different contents of BaPbO3 (10mass%, 20mass% and 30mass%) were added in YBa2Cu3O7-δ. It was proved that there were no reactions between YBa2Cu3O7-δ and BaPbO3. And the superconductivity of the mixtures was much better than that of the samples with PbO additive. 展开更多
关键词 YBa2Cu3O7-δ PbO additive melting temperature superconductivity
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Effect of B2O3Additives on the Sintering and Dielectric Behaviors of CaMgSi2O6Ceramics 认领 引用 被引量：1
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作者 Huanping Wang Shiqing Xu +2 位作者 Suya Zhai Degang Deng Haidong Ju 《Journal of Materials Science & Technology》 SCIE EI CAS 2010年第4期351-354,共4页
The effects of B2O3 addition,as a sintering agent,on the sintering behavior,microstructure and dielectric properties of CaMgSi2O6 ceramic have been investigated.The CaO-MgO-B2O3-SiO2 glassy phase came forth by adding ... The effects of B2O3 addition,as a sintering agent,on the sintering behavior,microstructure and dielectric properties of CaMgSi2O6 ceramic have been investigated.The CaO-MgO-B2O3-SiO2 glassy phase came forth by adding B2O3 into CaO-MgO-SiO2 ceramic powders,and it was advantageous to lower the synthesis temperature of CaMgSi2O6 crystalline phase.Moreover,the emergence of CaO-MgO-B2O3-SiO2 glass phase could effectively lower the sintering temperature of CaMgSi2O6 ceramic and promote the CaMgSi2O6 grains growing.With 6 wt pct B2O3 addition,the densification temperature of CaMgSi2O6 ceramic could be effectively reduced from 1300 to 1100℃,and the dielectric constant(εr)and dielectric loss(tanδ)were:εr=7.61 and tanδ=7.4×10^-4(1 MHz). 展开更多
关键词 Dielectric properties Microstructure CaMgSi2O6 ceramic B2O3 addition
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Effects of Nucleating Additives on Crystallization and Properties of CaO-B_2O3-SiO2 Glass-ceramics 认领 引用 被引量：1
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作者 WANG Zhongjian ZHANG Jifa +1 位作者 HU Yichen HOU Fengzhen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第6期997-1000,共4页
ZrO2,TiO2 and P2O5 were doped in CaO-B2O3-SiO2 glass-ceramics as nucleating additives.Effects of different nucleating additives on the phase separation and crystalline behaviors were investigated by using gradient tem... ZrO2,TiO2 and P2O5 were doped in CaO-B2O3-SiO2 glass-ceramics as nucleating additives.Effects of different nucleating additives on the phase separation and crystalline behaviors were investigated by using gradient temperature furnace,DTA and XRD.Then,sintering process of the glass-ceramics was investigated by testing sintering shrinkage,dielectric constant and loss.The experimental results shows that the glass-ceramics doped with nucleating additives represents higher crystallization,with ZrO2 as an exceptional effective dopant to promote the precipitation of wollastonite crystal.Finally,ZrO2 containing glass-ceramics was chosen to study the influence of sintering temperature and soaking time with the help of X-ray diffraction analysis and density measurement.The glass-ceramics can be well consolidated at 850℃for 10 min,with low dielectric constant(5.87)and loss(3.21×10^-4),which is desirable for LTCC application. 展开更多
关键词 CaO-B2O3-SiO2 glass-ceramics nucleating additives crystallization sinterability
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Effects of CeO_2 additives on the microstructure and mechanical properties of WC-Al_2O_3 composites 认领 引用 被引量：1
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作者 QU Haixia WU Qiong WEN Hongquan 《Baosteel Technical Research》 EI CAS 2015年第3期17-22,共6页
To improve the mechanical properties of WC-Al2O3 composites, the effects of trace amount of CeO2 additives on the microstructure and mechanical properties of the WC-Al2O3 composites prepared by hot pressing were inves... To improve the mechanical properties of WC-Al2O3 composites, the effects of trace amount of CeO2 additives on the microstructure and mechanical properties of the WC-Al2O3 composites prepared by hot pressing were investigated. The results revealed that the WC-Al2O3 composites doped with 0.1% CeOz possessed refined microstructure and enhanced mechanical properties compared with that of the undoped WC-Al2O3composites. Trace CeO2 suppressed the decarburization of WC, promoted the microstructural refinement, and improved the interface coherence of the WC matrix and Al2O3. When 0.1% CeO2 was added to the WC-Al2O3 composites, the effect of CeO2 resulted in the achievement of a relative density of 98.82% with an excellent Vickers hardness of 16.89 GPa, combining a fracture toughness of 9.85 MPa. m1/2 with an acceptable flexural strength of 1 024.05 MPa. 展开更多
关键词 CeO2 additives microstructure mechanical properties WC-Al2O3 composites
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基于TiO_2-Y_2O_3粉体催化发光甲醇气体传感器的研究 认领 引用 被引量：11
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作者 饶志明 谢静宜 +2 位作者 刘林洁 曾玉云 蔡文联 《化学学报》 SCIE CAS 北大核心 2007年第6期532-536,共5页
发现当甲醇气体通过TiO2-Y2O3(质量比为3∶1)粉体表面时,可被空气中的O2催化氧化产生强烈的化学发光,基于此研制了一种新型的甲醇气体传感器.此传感器对甲醇的检测具有较高灵敏度和较强的选择性.在波长490nm处进行定量分析,催化发光强... 发现当甲醇气体通过TiO2-Y2O3(质量比为3∶1)粉体表面时,可被空气中的O2催化氧化产生强烈的化学发光,基于此研制了一种新型的甲醇气体传感器.此传感器对甲醇的检测具有较高灵敏度和较强的选择性.在波长490nm处进行定量分析,催化发光强度与甲醇浓度在一定范围内呈良好的线性关系,其线性范围为25.74～12870mg/m3(r=0.9995,n=8);检出限为8.58mg/m3(信噪比=3).外来物质如正己烷、三氯甲烷、苯、无水乙醇、甲醛、丙酮、氨、甲苯与甲醇共存时,除了丙酮、乙醇和氨分别引起干扰外,苯与其它气体不干扰测定.该传感器工作时间可持续80h以上,是一种长寿命的、性能稳定的气体传感器,并成功地实现了对甲醇气体的实时在线检测. 展开更多
关键词 催化发光 甲醇 气体传感器 TiO2-Y2O3粉体
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CeO_2-Y_2O_3涂层和负载型Pd催化剂催化燃烧VOCs(英文) 认领 引用 被引量：11
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作者 金凌云 鲁继青 +2 位作者 罗孟飞 谢冠群 何迈 《物理化学学报》 SCIE CAS 北大核心 2007年第11期1691-1695,共5页
制备了一种粘附在堇青石蜂窝陶瓷载体上的CeO_2-Y_2O_3(CeY)复合氧化物新涂层.以二氧化铈和柠檬酸钇为前驱体,制备过程中无有害物质产生,对环境友好.CeY涂层和Pd/CeY催化剂通过SEM、EDX、XRF和Raman光谱等表征.结果表明,此涂层的粘结强... 制备了一种粘附在堇青石蜂窝陶瓷载体上的CeO_2-Y_2O_3(CeY)复合氧化物新涂层.以二氧化铈和柠檬酸钇为前驱体,制备过程中无有害物质产生,对环境友好.CeY涂层和Pd/CeY催化剂通过SEM、EDX、XRF和Raman光谱等表征.结果表明,此涂层的粘结强度高,对活性组分的吸附性能好,适合用来负载钯催化剂.Y_2O_3大部分进入了峰窝陶瓷的孔道内,CeO_2和Pd物种则富集在载体的表面.以CO、甲苯和乙酸乙酯的催化燃烧来评价Pd/CeY催化剂的性能,此催化剂具有较好的催化活性和热稳定性.500℃焙烧的催化剂,CO、甲苯和乙酸乙酯的T99(转化率99%以上所需的最低反应温度)分别为150、220和310℃;1050℃焙烧的催化剂,它们的T99分别为180、250和330℃.高温焙烧的催化剂,活性物种PdO的晶粒增大,这可能导致催化剂的活性下降. 展开更多
关键词 CeO2-Y2O3涂层 Pd催化剂 堇青石蜂窝陶瓷载体 催化燃烧
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Crystallization and dielectric properties of lead-free glass-ceramic composites with Gd_2O_3 addition 认领 引用 被引量：6
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作者 Zhou, Yi Zhang, Qingmeng +2 位作者 Luo, Jun Tang, Qun Du, Jun 《Rare Metals》 SCIE EI CAS CSCD 2012年第3期281-284,共4页
Lead-free glass-ceramic composites in barium sodium niobate silica system with Gd2O3 addition were synthesized through melt-casting fol-lowed by controlled crystallization technique. Crystallization and dielectric pro... Lead-free glass-ceramic composites in barium sodium niobate silica system with Gd2O3 addition were synthesized through melt-casting fol-lowed by controlled crystallization technique. Crystallization and dielectric properties of the Gd2O3 adding glass-ceramic composites were investigated. With the increase in the concentration of Gd2O3, the glass transition temperature and the crystallization temperature of the pre-cursor glass shift towards the higher temperature. The crystallization behavior that occurred during the heat treatment procedure leads to the enhancement of dielectric constant. All the three compositions of glass-ceramic composites exhibit ferroelectricity when tested at room tem-perature. Both the values of the remanent polarization and coercive field are enhanced regularly with the gradual increase in the concentration of Gd2O3 additive under the same testing field. 展开更多
关键词 Gd2O3 addition glass-ceramic composites crystallization dielectric properties ferroelectricity
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阴极气膜微弧放电沉积ZrO_2-Y_2O_3陶瓷涂层 认领 引用 被引量：17
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作者 韩伟 何业东 +2 位作者 王德仁 薛润东 高唯 《稀有金属》 CAS 北大核心 2004年第4期622-626,共5页
采用阴极气膜微弧放电沉积制备ZrO2 Y2 O3陶瓷涂层 ,利用水溶液中阴极气膜放电产生的等离子体的能量 ,使在阴极表面形成的沉积物直接烧结为陶瓷涂层。研究了沉积涂层的影响因素和涂层形貌及结构。SEM ,EDS和XRD分析结果表明 ,获得的ZrO2... 采用阴极气膜微弧放电沉积制备ZrO2 Y2 O3陶瓷涂层 ,利用水溶液中阴极气膜放电产生的等离子体的能量 ,使在阴极表面形成的沉积物直接烧结为陶瓷涂层。研究了沉积涂层的影响因素和涂层形貌及结构。SEM ,EDS和XRD分析结果表明 ,获得的ZrO2 Y2 O3陶瓷涂层表面光滑、与基体结合致密、成分和相结构均匀 ,是一种由Y2 O3部分稳定的ZrO2 陶瓷涂层。通过测试阴极气膜放电过程中电流随时间的变化以及电位在两电极间分布 。 展开更多
关键词 阴极气膜微弧放电 等离子体电解沉积 ZrO2-Y2O3 陶瓷涂层
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MgO-Al_2O_3-SiO_2-TiO_2-Y_2O_3玻璃的弹性模量 认领 引用 被引量：7
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作者 迟玉山 沈菊云 +1 位作者 陈学贤 缪之训 《无机材料学报》 SCIE EI CAS 北大核心 2002年第3期475-479,共5页
根据硬盘基板用材料的要求,制备了MgO－Al2O3－SiO2－TiO2－Y2O3高弹性模量玻璃(120GPa)玻璃的弹性模量随组成的变化服从Makishima－Mackenzie理论,MgO、Al2O3、TiO2、Y2O3等具有较高单位体积离解能的氧化物有利于提高玻璃的弹性模量．... 根据硬盘基板用材料的要求,制备了MgO－Al2O3－SiO2－TiO2－Y2O3高弹性模量玻璃(120GPa)玻璃的弹性模量随组成的变化服从Makishima－Mackenzie理论,MgO、Al2O3、TiO2、Y2O3等具有较高单位体积离解能的氧化物有利于提高玻璃的弹性模量．但玻璃弹性模量的理论计算值低于测试值．这是因为Makishima－Mackenzie理论没有考虑玻璃内阳离子的具体配位状态,对MgO、Y2O3堆积密度因子的推导存在误差．因此利用Makishima－Mackenzie理论发展高弹性模量玻璃时应对MgO、Y2O3等氧化物的计算进行修正． 展开更多
关键词 MgO-Al2O3-SiO2-TiO2-Y2O3玻璃 弹性模量 Makishima-Mackenzie理论 硬盘基板
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复合TiO_2-Y_2O_3催化发光环氧丙烷气体传感器 认领 引用 被引量：7
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作者 李铭 陈景业 +1 位作者 胡玉斐 李攻科 《分析化学》 SCIE EI CAS CSCD 北大核心 2019年第2期191-197,共7页
制备了TiO_2-Y_2O_3纳米复合材料,并研究了环氧丙烷在其表面产生的催化发光现象,基于此,研制了环氧丙烷催化发光传感器。此传感器对丙酮、乙醛、苯等常见的挥发性有机物没有响应,显示出良好的选择性。对复合物的不同氧化物比例及烧结温... 制备了TiO_2-Y_2O_3纳米复合材料,并研究了环氧丙烷在其表面产生的催化发光现象,基于此,研制了环氧丙烷催化发光传感器。此传感器对丙酮、乙醛、苯等常见的挥发性有机物没有响应,显示出良好的选择性。对复合物的不同氧化物比例及烧结温度进行优化,得到TiO_2与Y_2O_3质量比为1∶3、烧结温度为500℃时,催化材料性能最佳。在最优实验条件下,即197℃、波长490 nm及载气流速0.3 L/min时,催化化学发光强度与环氧丙烷浓度在4.5～1375 mg/L范围内呈现良好的线性关系,检出限(3σ)为1.25 mg/L。此传感器具有灵敏快速、操作简便等优点,采用此传感器实时监测熏蒸谷物中环氧丙烷残留量,结果与气相色谱法吻合,相对偏差为2.7%～4.9%,显示出此传感器良好的性能。对环氧丙烷催化氧化的机理进行了初步探讨。 展开更多
关键词 纳米TiO2-Y2O3 环氧丙烷 催化发光 气体传感器
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Significant enhancement in water resistance of Pd/Al2O3 catalyst for benzene oxidation by Na addition 认领 引用 被引量：4
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作者 Shunyu Kang Meng Wang +3 位作者 Na Zhu Chunying Wang Hua Deng Hong He 《Chinese Chemical Letters》 SCIE CAS CSCD 2019年第7期1450-1454,共5页
A series of Na-doped 1 wt% Pd/Al2O3 catalysts with different Na loadings were prepared by wet impregnation and tested for the catalytic oxidation of benzene. Suitable addition of Na had a remarkable promotion effect o... A series of Na-doped 1 wt% Pd/Al2O3 catalysts with different Na loadings were prepared by wet impregnation and tested for the catalytic oxidation of benzene. Suitable addition of Na had a remarkable promotion effect on water resistance and enhancement of low temperature activity of Pd/Al2O3 catalysts. The optimal mole ratio between Na and Pd was 1:1. The properties of the prepared catalysts were characterized by X-ray diffraction (XRD), Brunauer Emmett Teller (BET), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), O2-temperature-programmed desorption (O2-TPD), and in situ DRIFTS. Results indicated that the addition of Na not only decreased the content of adsorbed water species but also increased the amount of liable surface oxygen species, which are likely the key factors for the excellent water resistance of the catalyst. Na addition also improved the mobility of the lattice oxygen species, which was favorable for catalytic activity. Moreover, the well-dispersed negatively charged Pd particles and suitable redox properties derived from Na addition also contributed to the improved performance and water resistance of the Na1Pd1/Al2O3 catalyst. In situ DRIFTS results revealed that benzene was oxidized to maleate and acetate species via intermediate o-benzoquinone species, which finally turned into harmless CO2 and H2O. 展开更多
关键词 Sodium addition Pd/Al2O3 Benzene Water resistance Catalytic oxidation
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Effects of Yttrium Ion on Formation Mechanism of ZrO_2-Y_2O_3 Ceramic Coatings Formed by Plasma Electrolytic Oxidation on Al-12Si Alloy 认领 引用 被引量：4
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作者 王萍 LI Jianping +2 位作者 GUO Yongchun YANG Zhong WANG Jianli 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第5期1044-1048,共5页
ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that... ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that adding an appropriate amount of yttrium ion can improve the growing rate of ceramic coating at different oxidation stages and decrease arc voltage. The thickness of ZrO2-Y2O3 coating is 16 μn thicker than that of ZrO2 coating and the maximum oxidation rate improves by 0.6 μm/min. In addition, the arc voltage decreases from 227 to 172 V. It can be seen that the rate of oxidation firstly increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g-L-1The maximum thickness is 90 μm.Compared to ZrO2 coating, the micropores of ZrO2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by ZrO2 and Y2O3 ceramic particles. Meanwhile, the binding force between coating and substrate is better and the coating is uniform and compact. The ceramic layer is mainly composed of c-Y0.15Zr0.85O1.93□0.07, m-ZrO2, α-Al2O3, ,γ-Al2O3 and Y2O3. It is indicated that ZrO2 has beert fully stabilized by yttrium ion through the formation of solid solution. 展开更多
关键词 Al-12Si alloys yttrium ion plasma electrolytic oxidation ZrO2-Y2O3 ceramic coating
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高能球磨Al_2O_3-Y_2O_3粉体混合物的研究 认领 引用 被引量：3
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作者 李长青 左洪波 +2 位作者 张明福 韩杰才 孟松鹤 《兵器材料科学与工程》 CAS 北大核心 2006年第3期46-50,共5页
为了合成Y3Al5O12(YAG),对Al2O3-Y2O3粉体混合物进行了高能球磨研究。研究表明球磨后的粉体XRD衍射峰明显,并非无定形态,球磨后粉体中的Al2O3、Y2O3达到纳米级别尺寸后,随着晶粒尺寸的减少而晶格畸变增加,且烧结成的YAG粉体与Al2O3、Y2O... 为了合成Y3Al5O12(YAG),对Al2O3-Y2O3粉体混合物进行了高能球磨研究。研究表明球磨后的粉体XRD衍射峰明显,并非无定形态,球磨后粉体中的Al2O3、Y2O3达到纳米级别尺寸后,随着晶粒尺寸的减少而晶格畸变增加,且烧结成的YAG粉体与Al2O3、Y2O3粉体有相似的晶格变化趋势。 展开更多
关键词 高能球磨 Al2O3-Y2O3 晶格畸变 YAG
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水热法制备(NH_4)_xWO3-y和WO_3·1/3H_2O:反应温度对产物物相、微结构和光学性能的影响(英文) 认领 引用 被引量：3
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作者 王琨 康利涛 +3 位作者 陈石 董丽 梁伟 高峰 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2014年第5期550-556,共7页
本工作研究了水热法制备钨系氧化物过程中反应温度对产物物相、微结构和光学性能的影响。XRD结果表明100℃条件下制备的样品为纳米六方相铵钨青铜(NH4)xWO3-y。随着水热温度升高(140和180℃),部分六方相(NH4)xWO3-y逐步转变为正交相三... 本工作研究了水热法制备钨系氧化物过程中反应温度对产物物相、微结构和光学性能的影响。XRD结果表明100℃条件下制备的样品为纳米六方相铵钨青铜(NH4)xWO3-y。随着水热温度升高(140和180℃),部分六方相(NH4)xWO3-y逐步转变为正交相三氧化钨WO3·1/3H2O,形成两相共存产物。SEM和TEM分析证实(NH4)xWO3-y和WO3·1/3H2O粒子均为沿[001]方向(c轴)生长的短棒状单晶,随水热反应进行它们会通过取向融并(oriented attachment)方式进一步长大。结构分析同时证实,棒状晶的物相与其尺寸存在明显联系,纳米尺寸的棒状晶为六方(NH4)xWO3-y相,而微米尺寸的棒状晶为正交WO3·1/3H2O相。依据实验结果,提出了一种表面能控制的六方相(NH4)xWO3-y向正交相WO3·1/3H2O相转变机理。光学性能测量表明,100℃制备的六方相(NH4)xWO3-y样品可以很好的遮蔽近红外光(遮蔽率:74.5%),同时保持高可见光透过率(67.6%)。 展开更多
关键词 (NH4)xWO3-y WO3-x·1 3H2O 反应温度 近红外光遮蔽性能
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含LiAlO2-Y2O3复合助烧剂的氮化硅陶瓷低温致密化研究 认领 引用 被引量：5
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作者 郭昂 王战民 +1 位作者 赵世贤 李凌锋 《耐火材料》 CAS 北大核心 2020年第5期369-373,共5页
以高α相含量的Si3N4粉体为主要原料,LiAlO 2-Y2O3作为复合助烧剂,在无压条件下烧结Si3N4陶瓷,研究了LiAlO2-Y2O3助烧剂体系对Si3N4陶瓷烧结致密化过程、相变过程和显微结构的影响。结果表明:LiAlO2-Y2O3助烧剂对Si3N4陶瓷致密化温度的... 以高α相含量的Si3N4粉体为主要原料,LiAlO 2-Y2O3作为复合助烧剂,在无压条件下烧结Si3N4陶瓷,研究了LiAlO2-Y2O3助烧剂体系对Si3N4陶瓷烧结致密化过程、相变过程和显微结构的影响。结果表明:LiAlO2-Y2O3助烧剂对Si3N4陶瓷致密化温度的降低和相转变速率的提高有明显作用,在1500℃有低共熔点液相LiAlSi 3O 8生成,且α-Si3N4向β-Si3N4的相转变开始进行,埋碳烧结时被氧化部分为试样表面。在LiAlO2-Y2O3助烧剂体系中,对Si3N4陶瓷低温致密化起主导作用的是LiAlO 2,当LiAlO 2加入量为8%(w)时试样的相对密度达到98.1%,且可以得到发育良好的柱状β-Si3N4晶粒。而Y2O3对α-Si3N4向β-Si3N4的相转变速率有明显提高,随着Y2O3加入量的增加,β-Si3N4转化率随之提高。当Y2O3加入量为8%(w)时β-Si3N4转化率达到91%。 展开更多
关键词 氮化硅 LiAlO2-Y2O3助烧剂 致密化 β-Si3N4转化率
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Concentration and annealing effect on PL properties of sol-gel derived SiO_2-Y_2O_3:Eu3+ nanocomposites 认领 引用 被引量：2
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作者 王忆 曾庆光 +3 位作者 胡社军 吴坤彬 蒋俊宏 陈根廷 《Journal of Rare Earths》 SCIE EI CAS 2010年第2期176-180,共5页
An improved sol-gel method was employed to prepare Eu3+ ions doped SiO2-Y2O3 nanocomposites.Systematic study was carried out on the effect of post-annealing treatment on photoluminescence(PL) properties of the samples... An improved sol-gel method was employed to prepare Eu3+ ions doped SiO2-Y2O3 nanocomposites.Systematic study was carried out on the effect of post-annealing treatment on photoluminescence(PL) properties of the samples under various europium ions doping concentrations.X-ray diffraction(XRD) patterns indicated that the samples showed an amorphous matrix structure,and the scanning electron microscopy(SEM) pictures showed that the samples presented a nano size(from 21 to 42 nm) granular-stack structure after hi... 展开更多
关键词 Eu3+doped SiO2-Y2O3 glass photoluminescence（PL） nanocomposites rare earths
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Sol-gel热压法制备Al_2O_3-Y_2O_3复合陶瓷涂层及其抗高温氧化性能 认领 引用 被引量：4
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作者 李良坚 何业东 王德仁 《材料热处理学报》 EI CAS 北大核心 2005年第6期101-104,共4页
探索了一种采用sol-gel热压法一次性制备厚陶瓷涂层的新技术。在样品表面涂覆sol-gel与纳米、微米氧化物粉组成的混合料浆层,在加压加热条件下使其固化,然后在高温下烧结,可以在试样表面获得一层连续的、厚的Al2O3-Y2O3陶瓷涂层。扫描... 探索了一种采用sol-gel热压法一次性制备厚陶瓷涂层的新技术。在样品表面涂覆sol-gel与纳米、微米氧化物粉组成的混合料浆层,在加压加热条件下使其固化,然后在高温下烧结,可以在试样表面获得一层连续的、厚的Al2O3-Y2O3陶瓷涂层。扫描电子显微镜(SEM)、X射线衍射(XRD)结果分析表明,该陶瓷涂层与基体结合紧密,厚度大于10μm。900℃氧化的实验结果表明,用此方法制备的陶瓷涂层具有优异的抗高温氧化性能。 展开更多
关键词 Sol-gel热压 Al2O3-Y2O3陶瓷涂层 抗氧化性能
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Synthesis of ZrO_2-HfO_2-Y_2O_3-Sc_2O_3 Nano-Particles by Sol-Gel Technique in Aqueous Solution of Alcohol 认领 引用 被引量：1
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作者 甄强 陈瑞芳 +1 位作者 严凯 李榕 《Journal of Rare Earths》 SCIE EI CAS 2007年第2期199-203,共5页
Agglomeration-free nanosized ZrO2-HfO2-Y2O3-Sc2O3 composite powders were successfully synthesized by Sol-Gel technique in heated aqueous solution of alcohol, using analytically pure ZrOCl2 · 8H2O, HfOCl2·8H2... Agglomeration-free nanosized ZrO2-HfO2-Y2O3-Sc2O3 composite powders were successfully synthesized by Sol-Gel technique in heated aqueous solution of alcohol, using analytically pure ZrOCl2 · 8H2O, HfOCl2·8H2O, Y（NO3）3·6H2O, and Sc2O3 as raw materials. The effect of synthesis condition on the size and dispersity of the composite powders was investigated by means of XRD, TEM, and TG-DSC techniques. The results showed that well-dispersed predecessor of ZrO2-HfO2-Y2O3-Sc2O3 composite nanopowders could be obtained. The optional condition ： PEG6000 as dispersant was 1%, alcohol/H2O ratio was 5/1, metallic ion concentration in whole solution was 0.5 mol·L^-1 and the pH value of the solution was 12. After calcined at 620 ℃, the powder obtained was in uniform cubic structure, and its average particle size was about 13 nm, which was good for producing nanocrystalline solid electrolyte. 展开更多
关键词 ZrO2-HfO2-Y2O3-Sc2O3 composite nanopowders sol-gel aqueous solution of alcohol dispersibility rare earths
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模板浸渍法制备Al2O3-ZrO2-Y2O3复合陶瓷纤维及其烧结工艺 认领 引用 被引量：1
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作者 高俊国 刘雪姣 +2 位作者 马怀超 张海涛 何业东 《材料热处理学报》 EI CAS CSCD 北大核心 2011年第3期1-4,9,共4页
以蚕丝为模板,Al、Zr、Y的硝酸盐乙醇溶液为浸渍液,采用模板浸渍法制备了Al2O3-ZrO2-Y2O3复合陶瓷纤维。采用FE-SEM,XRD,TG-DTG和DTA对复合陶瓷纤维的制备及烧结工艺进行了分析研究,实验结果表明所得陶瓷纤维保留了原蚕丝模板纤维的形貌... 以蚕丝为模板,Al、Zr、Y的硝酸盐乙醇溶液为浸渍液,采用模板浸渍法制备了Al2O3-ZrO2-Y2O3复合陶瓷纤维。采用FE-SEM,XRD,TG-DTG和DTA对复合陶瓷纤维的制备及烧结工艺进行了分析研究,实验结果表明所得陶瓷纤维保留了原蚕丝模板纤维的形貌,随着烧结温度的提高,蚕丝基体逐渐热解,纤维直径逐渐变小,在1200℃烧结后的主要相组成为:α-Al2O3、θ-Al2 O3、Y2 O3稳定t-ZrO2和m-ZrO2。 展开更多
关键词 模板浸渍法 蚕丝 Al2O3-ZrO2-Y2O3复合陶瓷纤维
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YBa_2Cu_3O7-y超导体中氧的非化学计量和缺陷平衡 认领 引用 被引量：3
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作者 李国勋 黄爱琴 +1 位作者 马淑兰 李国斌 《中国稀土学报》 CAS 北大核心 1989年第2期21-24,共4页
本文提出了一种直接合成热重法,在空气中测定了室温下YBa_2Cu_2O7-y超导体分子式中的y值为0.234±0.005。研究了不同温度下氧空位浓度的变化,求得氧空位形成焓为:ΔHf(o)=0.43eV(正交晶系);ΔHf(t)=0.24eV(四方晶系)。从... 本文提出了一种直接合成热重法,在空气中测定了室温下YBa_2Cu_2O7-y超导体分子式中的y值为0.234±0.005。研究了不同温度下氧空位浓度的变化,求得氧空位形成焓为:ΔHf(o)=0.43eV(正交晶系);ΔHf(t)=0.24eV(四方晶系)。从两种晶系的氧空位浓度与温度的关系推出了晶型转变温度约为670℃左右。 展开更多
关键词 YBa2Cu3O7-y 超导体 氧 氧空位 钇
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