期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到6,710篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
ZrO2对Li2O-Al2O3-B2O3微晶玻璃析晶行为及微波介电性能的影响 认领 引用
1
作者 倪宇博 陈志斌 +8 位作者 曾广 罗琼 陈巧 刘佳 李文俊 邹澳琪 王静 田培静 韩建军 《硅酸盐通报》 CAS 北大核心 2026年第3期835-844,共10页
随着5G技术的推进,微波和毫米波频段器件对高性能介电材料的需求日益增长。本文以Li2O-Al2O3-B2O3(LAB)体系微晶玻璃为研究对象,采用低温共烧法制备了能在超低温下烧结致密且具有优异微波介电性能的微晶玻璃,并研究了外... 随着5G技术的推进,微波和毫米波频段器件对高性能介电材料的需求日益增长。本文以Li2O-Al2O3-B2O3(LAB)体系微晶玻璃为研究对象,采用低温共烧法制备了能在超低温下烧结致密且具有优异微波介电性能的微晶玻璃,并研究了外加ZrO2对LAB微晶玻璃析晶行为及微波介电性能的影响。结果表明:当ZrO2掺量从0.2%(摩尔分数,下同)增至0.8%时,LAB微晶玻璃主晶相为LiBO2,析出晶体种类和数量基本没有变化。微晶玻璃Avrami指数n为3.05~3.89,表明该体系的晶体生长机制主要为体析晶,ZrO2的引入降低了微晶玻璃的析晶活化能。随着ZrO2掺量的增加,LAB微晶玻璃显微结构中气孔增多,体积密度也因此而降低。当外加0.2%ZrO2时,Z1微晶玻璃在650℃下烧结7 h具备良好的微波介电性能,微波相对介电常数εr=7.5,品质因素Q×f=16958 GHz,该微晶玻璃是一种良好的超低温共烧陶瓷(ULTCC)候选材料。 展开更多
关键词 Li2O-Al2O3-B2O3微晶玻璃 超低温共烧陶瓷 ZrO2 微波介电性能 析晶活化能 微观结构
暂未订购 下载PDF
石墨烯对光固化Al2O3陶瓷力学性能的影响 认领 引用
2
作者 刘耀 余庆轩 +3 位作者 王中原 文蓉江 李澜波 占丽娜 《热加工工艺》 CAS 北大核心 2026年第13期75-82,共8页
针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含... 针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含量的石墨烯,制备高固相、低粘度的光固化浆料。通过傅里叶红外光谱、旋转流变仪、沉降试验及Beer-Lambert模型分析,优化了浆料配方与光固化工艺参数。结果表明:当KH560含量为2.5wt%、石墨烯含量为0.01wt%时,浆料粘度最低、沉降分层最少;在曝光时间4 s条件下,添加0.01wt%石墨烯的浆料透射深度为382μm,临界曝光能量为44.3 m J/cm2。经1750℃烧结后,陶瓷零件致密度达99.7%,弯曲强度为27.61 MPa,维氏硬度为13.45GPa。石墨烯通过位阻效应及裂纹偏转机制有效促进了烧结致密化并改善了力学性能。本研究为光固化增材制造高致密、高性能氧化铝陶瓷提供了试验依据。 展开更多
关键词 石墨烯 光固化 Al2O3陶瓷 浆料 流变性能
暂未订购 下载PDF
釉中SiO2和Al2O3含量对青花瓷“晕散”的影响研究 认领 引用
3
作者 李小龙 胡其国 +2 位作者 赵田贵 董伟霞 包启富 《中国陶瓷》 CAS CSCD 北大核心 2026年第7期79-88,共10页
青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光... 青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光谱(FTIR)、电子探针(EPMA)、光学显微镜(OM)等设备分析青花瓷釉中SiO2和Al2O3含量对青花装饰晕散距离、微观结构、釉层网络结构以及釉中Co2+浓度的影响,结合理论计算阐明了青花瓷“晕散”与釉料黏度之间的关系。实验结果表明,随着釉中SiO2和Al2O3含量的增加,釉层网络结构中Si—O—Si键数量增多并且增强,釉层黏度增大;黏流活化能拟合结果表明,黏流活化能增大,原子间作用力越强,Co2+在釉中扩散越困难,青花瓷线条的“晕散”距离从250μm减小到10μm。本研究有助于从物理化学角度理解青花“晕散”机制,为青花装饰工艺的优化提供科学依据。 展开更多
关键词 青花瓷 SiO2 Al 2O3 晕散 黏流活化能
暂未订购 下载PDF
退火对原子层沉积W/Al2O3纳米薄膜形貌与电学性能的影响 认领 引用
4
作者 高管哗 王国政 +1 位作者 蒋恩桐 王天昊 《物理化学进展》 2026年第2期110-121,共12页
在氮气气氛下对原子层沉积法制备的W/Al2O3薄膜进行了退火处理,利用高阻测试仪、扫描电子显微镜及能量色散X射线谱对薄膜进行表征,研究了退火对薄膜电学性能及形貌的影响。结果表明,在1 h退火时间下,400℃~600℃退火不仅使薄膜方块电阻... 在氮气气氛下对原子层沉积法制备的W/Al2O3薄膜进行了退火处理,利用高阻测试仪、扫描电子显微镜及能量色散X射线谱对薄膜进行表征,研究了退火对薄膜电学性能及形貌的影响。结果表明,在1 h退火时间下,400℃~600℃退火不仅使薄膜方块电阻数值明显降低,而且随退火温度升高呈持续下降趋势,当退火温度上升至700℃~800℃时,方块电阻偏离下降趋势,出现了明显上升趋势;当退火时间延长至2 h时,薄膜在400℃~500℃条件下仍保持下降趋势,但在600℃条件下方块电阻出现明显跃升。SEM与EDS结果表明,电学异常与薄膜表面连续性下降密切相关。 展开更多
关键词 原子层沉积 W/Al2O3纳米薄膜 退火 方块电阻 表面形貌
暂未订购 下载PDF
Tb3+离子掺杂的Al2O3基发光材料的微波水热合成与性能 认领 引用
5
作者 程文俊 刘静 张俊计 《纳米技术》 2026年第2期17-25,共9页
以Al(NO3)3·9H2O和尿素为原料,采用微波水热–焙烧法制备了稀土离子Tb3+掺杂的Al2O3基发光材料。利用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、同步热分析仪(TG-DSC)、荧光光谱仪(FS)和Chromaticity Diagram等对产物的结构、形貌... 以Al(NO3)3·9H2O和尿素为原料,采用微波水热–焙烧法制备了稀土离子Tb3+掺杂的Al2O3基发光材料。利用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、同步热分析仪(TG-DSC)、荧光光谱仪(FS)和Chromaticity Diagram等对产物的结构、形貌、发光性能和CIE色度进行分析和表征。结果表明,在180℃下微波水热30 min,可制备出结晶良好的叶片状勃姆石。勃姆石经不同温度的焙烧,由γ-Al2O3向δ-Al2O3转变,焙烧后的样品形貌基本保留前驱体的形貌。掺杂Al2O3基发光材料的发光来自Tb3+的5D4→7Fj (j = 3, 4, 5, 6)能级跃迁发射,发光强度随焙烧温度的提高趋于增强,CIE色度随焙烧温度变化不明显,呈绿色。 展开更多
关键词 微波水热法 Al2O3基质 发光性能
暂未订购 下载PDF
Effect of Nano-ZrO2on Microstructure and Thermal Shock Behaviour of Al_2O3/SiC Composite Ceramics Used in Solar Thermal Power 认领 引用 被引量：7
6
作者 XU Xiaohong JIAO Guohao +3 位作者 WU Jianfeng LENG Guanghui FANG Binzheng ZHAO Fang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第2期285-289,共5页
The Al2O3-ZrO2(3Y)-SiC composite ceramics used in solar thermal power were prepared by micrometric Al2O3,nano-ZrO2 and SiC powders under the condition of pressureless sintering.The bulk density and bending strength of... The Al2O3-ZrO2(3Y)-SiC composite ceramics used in solar thermal power were prepared by micrometric Al2O3,nano-ZrO2 and SiC powders under the condition of pressureless sintering.The bulk density and bending strength of samples with 10vol%nano-ZrO2 sintered at 1480℃were 3.222 g/cm3 and 160.4MPa,respectively.The bending strength of samples after 7 times thermal shock tests(quenching from 1000℃to 25℃in air medium)is 132.0MPa,loss rate of bending strength is only 17%.The effect of nano-ZrO2 content on the microstructure and performance of Al2O3-ZrO2(3Y)-SiC composite ceramic was investigated.The experimental results show that the bending strength of samples with above 10vol%nano-ZrO2 content has decreased,because the volume expansion resulting from t-ZrO2 to m-ZrO2 phase transformation is excessive;Adding proper nano-ZrO2 would be contributed to improve the thermal shock resistance of the composite ceramics.The Al2O3-ZrO2(3Y)-SiC composite ceramic has promising potential application in solar thermal power. 展开更多
关键词 Al2O3 nano-ZrO2 transformation toughening thermal shock resistance composite ceramics solar thermal power
暂未订购 下载PDF
纳米Al2O3增强铝基复合材料制备技术及力学性能研究进展 认领 引用 被引量：4
7
作者 荣智峥 魏午 +4 位作者 赵宇 毕舰镭 高阳 黄晖 聂祚仁 《材料工程》 EI CAS CSCD 北大核心 2025年第5期130-144,共15页
纳米Al2O3/Al复合材料作为轻质高性能结构材料,可实现轻量化节能减排,在航空航天、汽车工业、船舶制造、国防及5G电子通讯等领域具有广阔的应用前景。本文主要介绍高能球磨粉末冶金法、超声辅助铸造法、搅拌摩擦法、增材制造法、... 纳米Al2O3/Al复合材料作为轻质高性能结构材料,可实现轻量化节能减排,在航空航天、汽车工业、船舶制造、国防及5G电子通讯等领域具有广阔的应用前景。本文主要介绍高能球磨粉末冶金法、超声辅助铸造法、搅拌摩擦法、增材制造法、原位反应法等国内外纳米Al2O3/Al复合材料制备技术。总结分析纳米Al2O3增强体、增强体与铝基体的界面微结构、增强体的尺寸和含量、铝基体的晶粒尺寸、增强体的分散性和微观构型设计对纳米Al2O3/Al复合材料力学性能的影响。概述了纳米Al2O3/Al复合材料中主要的强化机制。最后,展望了纳米Al2O3/Al复合材料未来在高增强体体积分数的大尺寸制备技术、非均质构型优化以及高强耐热结构功能一体化等方面的发展方向。 展开更多
关键词 纳米Al2O3 铝基复合材料 制备方法 力学性能 强化机制
暂未订购 下载PDF
Microstructure and electrical properties of Lu_2O_3-doped ZnO-Bi_2O_3-based varistor ceramics 认领 引用 被引量：16
8
作者 徐东 史小锋 +4 位作者 程晓农 杨娟 樊曰娥 袁宏明 施利毅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第12期2303-2308,共6页
Lu2O3-doped ZnO-Bi2O3-based varistor ceramics samples were prepared by a conventional mixed oxide route and sintered at temperatures in the range of 900-1 000°C,and the microstructures of the varistor ceramics sa... Lu2O3-doped ZnO-Bi2O3-based varistor ceramics samples were prepared by a conventional mixed oxide route and sintered at temperatures in the range of 900-1 000°C,and the microstructures of the varistor ceramics samples were characterized by X-ray diffractometry(XRD)and scanning electron microscopy(SEM);at the same time,the electrical properties and V-I characteristics of the varistor ceramics samples were investigated by a DC parameter instrument for varistors.The results show that the ZnO-Bi2O3-based varistor ceramics with 0.3%Lu2O3(molar fraction)sintered at 950°C exhibit comparatively ideal comprehensive electrical properties.The XRD analysis of the samples shows the presence of ZnO,Bi-rich,spinel Zn7Sb2O12 and Lu2O3-based phases. 展开更多
关键词 ZnO-Bi2O3 ceramics varistor rare earth electrical properties
暂未订购 下载PDF
Effect of La_2O_3 on Microstructure and Transmittance of Transparent Alumina Ceramics 认领 引用 被引量：12
9
作者 杨秋红 曾智江 +2 位作者 徐军 张红伟 丁君 《Journal of Rare Earths》 SCIE EI CAS 2006年第1期72-75,共4页
Optically transparent alumina ceramics were fabricated by conventional process and sintered without pressure in H2 atmosphere. The results indicate that relative densities of alumina specimens increase to theoretical ... Optically transparent alumina ceramics were fabricated by conventional process and sintered without pressure in H2 atmosphere. The results indicate that relative densities of alumina specimens increase to theoretical densities （T. D. ） with increasing content of La2O3. With increasing holding time during sintering, much less pores and larger grains were found in the sintered alumina samples. Higher transmittance was achieved in alumina codoped with MgO and La2O3 as compared with that doped with MgO only. The total-transmittance of alumina sample is up to 86% at twavelength range of 300 - 800 nm. 展开更多
关键词 inorganic nonmetallic material alumina transparent ceramics microstructure La2O3 rare earths
暂未订购 下载PDF
Mechanical properties and plasma erosion resistance of BN_p/Al_2O_3-SiO_2 composite ceramics 认领 引用 被引量：5
10
作者 段小明 贾德昌 +5 位作者 周玉 杨治华 王玉金 任凤琴 于达仁 丁永杰 《Journal of Central South University》 SCIE EI CAS 2013年第6期1462-1468,共7页
BNp/Al2O3-SiO2 system ceramic matrix composites with different volume fractions （10%-60%） of hexagonal BN particulates （BNp） were prepared by hot-press sintering technique. Phase components, microstructure, mechan... BNp/Al2O3-SiO2 system ceramic matrix composites with different volume fractions （10%-60%） of hexagonal BN particulates （BNp） were prepared by hot-press sintering technique. Phase components, microstructure, mechanical properties and plasma erosion resistance were also investigated. With the increase of h-BNp content, relative density and Vickers＇ hardness of the composite ceramics decrease, while the flexural strength, elastic modulus and fracture toughness increase and then decrease. The plasma erosion resistance linearly deteriorated with the increase of BNp content which is mainly determined by the density, crystal structure and atomic number of the elements. 展开更多
关键词 BNp/Al2O3-SiO2 composite ceramics microstructures mechanical properties plasma erosion resistance
暂未订购 下载PDF
Thermal shock fatigue behavior of TiC/Al_2O_3 composite ceramics 认领 引用 被引量：6
11
作者 SI Tingzhi LIU Ning +1 位作者 ZHANG Qing＇ an YOU Xianqing 《Rare Metals》 SCIE EI CAS 2008年第3期308-314,共7页
The thermal shock fatigue behaviors of pure hot-pressed alumina and 30 wt.% TiC/Al2O3 composites were studied. The effect of TiC and Al2O3 starting particle size on the mechanical properties of the composites was disc... The thermal shock fatigue behaviors of pure hot-pressed alumina and 30 wt.% TiC/Al2O3 composites were studied. The effect of TiC and Al2O3 starting particle size on the mechanical properties of the composites was discussed. Indentation-quench test was conducted to evaluate the effect of thermal fatigue temperature difference （ΔT） and number of thermal cycles （Ⅳ） on fatigue crack growth （Δa）. The mechanical properties and thermal fatigue resistance of TiC/Al203 composites are remarkably improved by the addition of TiC. The thermal shock fatigue of monolithic alumina and TiC/Al2O3 composites is due to a ＂true＂ cycling effect （thermal fatigue）. Crack deflection and bridging are the predominant reasons for the improvement of thermal shock fatigue resistance of the composites. 展开更多
关键词 ceramic matrix composites TiC/Al2O3 composites thermal shock fatigue fatigue behavior fatigue resistance
暂未订购 下载PDF
Microstructure and microwave dielectric properties of lead borosilicate glass ceramics with Al_2O_3 认领 引用 被引量：4
12
作者 韦鹏飞 周洪庆 +2 位作者 王杰 张一源 曾凤 《Journal of Central South University》 SCIE EI CAS 2011年第6期1838-1843,共6页
The effects of Al2O3 addition on both the sintering behavior and microwave dielectric properties of PbO-B203-SiO2 glass ceramics were investigated by Fourier transform infrared spectroscope （FTIR）, differential ther... The effects of Al2O3 addition on both the sintering behavior and microwave dielectric properties of PbO-B203-SiO2 glass ceramics were investigated by Fourier transform infrared spectroscope （FTIR）, differential thermal analysis （DTA）, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results show that with the increase of Al2O3 content the bands assigned to [SiO4] nearly disappear. Aluminum replaces silicon in the glass network, which is helpful for the formation of boron-oxygen rings. The increase of the transition temperature Tg and softening temperature Tf of PbO-B2O3-SiO2 glass ceramics leads to the increase of liquid phase precipitation temperature and promotes the structure stability in the glasses, and consequently contributes to the decreasing trend of crystallization. Densification and dielectric constants increase with the increase of Al2O3 content, but the dielectric loss is worsened. By contrast, the 3% （mass fraction） Al2O3-doped glass ceramics sintered at 725℃ have better properties of density p=2.72 g/cm3, dielectric constant Er=6.78, dielectric loss tan8=2.6×10^-3 （measured at 9.8 GHz）, which suggest that the glass ceramics can be applied in multilayer microwave devices requiring low sintering temperatures. 展开更多
关键词 PbO-B203-SiO2 glass ceramics Al2O3 Fourier transform infrared spectroscope microstructure dielectric properties
暂未订购 下载PDF
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
13
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
暂未订购 下载PDF
Microstructure and Mechanical Properties of Al_2O_3/ZrO_2 Directionally Solidified Eutectic Ceramic Prepared by Laser 3D Printing 认领 引用 被引量：20
14
作者 Zhi Liu Kan Song +4 位作者 Bo Gao Tian Tian Haiou Yang Xin Lin Weidong Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第4期320-325,共6页
Directionally solidified eutectic ceramics such as Al2O3/ZrO2 are promising structural materials for ap- plications in harsh environment with an ultrahigh temperature. In this work, through adopting assistant heating ... Directionally solidified eutectic ceramics such as Al2O3/ZrO2 are promising structural materials for ap- plications in harsh environment with an ultrahigh temperature. In this work, through adopting assistant heating laser 3D printing, Al2O3/ZrO2 eutectic samples were manufactured with suppressing the forma- tion of cracks. The dependence of the average rod spacing （λav） on the scanning rate （V） follows a relation with λavV0.5 = 1 μm1.5 s^-0.5. Typical eutectic microstructures, so-called complex regular, were analyzed with respect to its evolution with modulating the growth conditions. Formation mechanism of the solidifi- cation defect, shrinkage porosity, was discussed and the defect is found to be significantly suppressed by optimizing the solidification parameters. The maximum hardness and fracture toughness are mea- sured to he 16.7 GPa and 4.5 MPa m1/2, respectively. The interplay between the propagation of cracks and the Al2O3/ZrO2 interface is discussed. 展开更多
关键词 Al2O3 ZrO2 Eutectic Solidification
暂未订购 下载PDF
Sintering,crystallization and dielectric properties of CaO-B_2O_3-SiO_2 system glass ceramics 认领 引用 被引量：3
15
作者 戴斌 朱海奎 +2 位作者 周洪庆 许贵军 岳振星 《Journal of Central South University》 SCIE EI CAS 2012年第8期2101-2106,共6页
CaO-B203-SiO2 （CBS） glass powders are prepared by conventional glass melting method at different melting temperatures whose properties and microstructures are characterized by X-ray diffraction （XRD） and scanning ... CaO-B203-SiO2 （CBS） glass powders are prepared by conventional glass melting method at different melting temperatures whose properties and microstructures are characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It is found that there are SiO2 and some unknown phases in CBS glass melting liquid from 1 300 ℃ to 1 500 ℃ and the amount of these phases decreases with the increase of the melting temperature. The CBS glass melted at 1 450 ℃ could be sintered from 830 ℃ to 930 ℃ and the bulk densities of the samples are all higher than 2.4 g/cm^3. From the points of the properties and energy conservation, the melting temperature of 1 450 ℃ is the optimal melting temperature. The glass ceramic sintered at 850 ℃ exhibits better dielectric properties： er=6.33, tan6=2.2×10^-3 at 10 GHz, and the major phases of the samples are CaSiO3, CaB2O4 and SiO2. 展开更多
关键词 glass ceramics CaO-B2O3-SiO2 sintering dielectric properties microstructure
暂未订购 下载PDF
Si3N4/Si2N2O相界面结合力及结构特征 认领 引用
16
作者 包嘉鑫 王卫国 +1 位作者 陈松 罗旭 《材料科学与工程学报》 CAS CSCD 北大核心 2026年第1期75-83,共9页
氮化硅陶瓷材料具有优良的综合性能,已在装备制造业和国防建设等领域得到应用。进一步提高氮化硅的力学性能,需深入了解相界面结构及特性,为高性能氮化硅陶瓷材料的研究和开发提供重要的理论基础。本研究通过透射电子显微镜观察了热等... 氮化硅陶瓷材料具有优良的综合性能,已在装备制造业和国防建设等领域得到应用。进一步提高氮化硅的力学性能,需深入了解相界面结构及特性,为高性能氮化硅陶瓷材料的研究和开发提供重要的理论基础。本研究通过透射电子显微镜观察了热等静压烧结的氮化硅陶瓷的Si3N4/Si2N2O相界面,构建了Si3N4/Si2N2O多种相界面模型。利用近列匹配和面重合阵点密度方法分析了Si3N4/Si2N2O相界面的结构特征,并利用分子动力学模拟计算了Si3N4/Si2N2O相界面的拉伸性能。研究结果表明,发育良好的Si2N2O晶粒与Si3N4晶粒结合紧密,界面处原子匹配有序,面重合原子密度较高,其位向关系为[0001]//[001],(1010)//(010);具有(1010)//(010)匹配特征的Si3N4/Si2N2O相界面的分离功高于其他相界面,所能承受的拉伸应力也高于其它相界面。以上结果表明,具有(1010)//(010)匹配特征的Si3N4/Si2N2O界面是一类低能稳定的相界面,增加此类相界面将有益于改善氮化硅陶瓷材料的力学性能。 展开更多
关键词 Si3N4陶瓷 Si2N2O 相界面 结合力
暂未订购 下载PDF
The fluorescence and thermoluminescence characteristics of α-Al_2O_3:C ceramics 认领 引用 被引量：3
17
作者 张斌 陆神洲 +1 位作者 张浩佳 杨秋红 《Chinese Physics B》 SCIE EI CAS 2010年第7期581-584,共4页
This paper reports that polycrystalline （α-Al2O3：C ceramics are fabricated by conventional ceramics process. The excitation, emission spectra, thermoluminescence （TL） and optical stimulated luminescence （OSL） ... This paper reports that polycrystalline （α-Al2O3：C ceramics are fabricated by conventional ceramics process. The excitation, emission spectra, thermoluminescence （TL） and optical stimulated luminescence （OSL） of α-Al2O3：C polycrystalline ceramics are investigated. There exists 410nm maximum emission peak which is caused by recombination of an electron with F＋ centre to produce an excited F centre. The samples show three clear TL glow peaks at 405, 493 and 610 K. The attenuation constant of exponentially decaying fast component （τ1） and slow component（τ2） of OSL curve are 8.43s and 41.73s, respectively. Those fluorescence and thermoluminescence characteristics are similar with α-Al2O3：C crystal. 展开更多
关键词 α-Al2O3：C ceramics thermoluminescence optical stimulated luminescence
暂未订购 下载PDF
THE STRUCTURE AND PROPERTIES OF Li_2O-Al_2O_3-SiO_2LOW EXPANSION GLASS CERAMICS CONTAINING B_2O_3 认领 引用 被引量：8
18
作者 XIAO Jing LI Hong CHENG Jinshu Wuhan University of Technology Wuhan University of Metallurgy 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1999年第1期41-45,共5页
Through measuring the coefficient of linear expansion, the structure and properties of the Li2O-Al2O3-SiO2 low expansion glass ceramics containing B2O3 are studied by JR and XRD. It is shoutn that the IR method is eff... Through measuring the coefficient of linear expansion, the structure and properties of the Li2O-Al2O3-SiO2 low expansion glass ceramics containing B2O3 are studied by JR and XRD. It is shoutn that the IR method is efficient in the study of the glass-ceramics structure. There is a " Boron abnormality" in the system which has an important influence on the properties of the glass-ceramics. 展开更多
关键词 boron abnormality Li2O-Al2O3-SiO2 system glass ceramics
暂未订购 下载PDF
Studies on the Structure and Properties of Multiphase Al_2O_3 Abrasion-resistant Ceramics 认领 引用 被引量：3
19
作者 WU Ren-Ping YU Yan RUAN Yu-Zhong 《Chinese Journal of Structural Chemistry》 SCIE CAS 北大核心 2006年第7期805-810,共6页
The Al2O3 abrasion-resistant ceramics is successfully prepared by using waste aluminum sludge as the main raw material with the addition of a little clay, talc and barium carbonate. The crystal structure and microstru... The Al2O3 abrasion-resistant ceramics is successfully prepared by using waste aluminum sludge as the main raw material with the addition of a little clay, talc and barium carbonate. The crystal structure and microstructure of ceramic are characterized by means of XRD, SEM, etc., and the physical and mechanical properties are also tested. The results show that besides the phase of corundum, a little mullite, Mg-Al spinel and hyalophane phases also exist in the product. These phases are produced via reaction in-situ, which can inhibit the overgrowth of Al2O3 grain in grain boundary, and improve the integral property of the material. 展开更多
关键词 Al2O3 ceramic crystal structure property in-situ synthesis
暂未订购 下载PDF
Al2O3coated polyimide porous films enable thin yet strong polymer-in-salt solid-state electrolytes for dendrite-free lithium metal batteries 认领 引用
20
作者 Haotian Zhang Shengfa Feng +6 位作者 Mufan Cao Xiong Xiong Liu Pengcheng Yuan Yaping Wang Min Gao Long Pan Zhengming Sun 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第8期492-497,共6页
The ineluctable introduction of lithium salt to polymer solid-state electrolytes incurs a compromise between strength,ionic conductivity,and thickness.Here,we propose Al2O3-coated polyimide(AO/PI)porous film as ... The ineluctable introduction of lithium salt to polymer solid-state electrolytes incurs a compromise between strength,ionic conductivity,and thickness.Here,we propose Al2O3-coated polyimide(AO/PI)porous film as a high-strength substrate to support fast-ion-conducting polymer-in-salt(PIS)solid-state electrolytes,aiming to suppress lithium dendrite growth and improve full-cell performance.The Al2O3coating layer not only refines the wettability of polyimide porous film to PIS,but also performs as a high modulus protective layer to suppress the growth of lithium dendrites.The resulting PI/AO@PIS exhibits a small thickness of only 35μm with an outstanding tensile strength of 11.3 MPa and Young's modulus of 537.6 MPa.In addition,the PI/AO@PIS delivers a high ionic conductivity of 0.1 m S/cm at 25°C.As a result,the PI/AO@PIS enables symmetric Li cells to achieve exceptional cyclability for over 1000 h at 0.1 m A/cm2without noticeable lithium dendrite formation.Moreover,the PI/AO@PIS-based LiFePO4||Li full cells demonstrate outstanding rate performance(125.7 m Ah/g at 5 C)and impressive cycling stability(96.1%capacity retention at 1 C after 200 cycles).This work highlights the efficacy of enhancing the mechanical properties of polymer matrices and extending cell performance through the incorporation of a dense inorganic interface layer. 展开更多
关键词 Polymer-in-salt solid-state electrolytes Inorganic interface layer Al2O3interfaciAl layer Li dendrites Cycling performance
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈