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Effect of Y2O3, CeO2 on Sintering Properties of Si3N4 Ceramics 王黎1,苏盛彪1,李竟先2,包亦望1 (1.Key Laboratory for Advanced Ceramics, China Building Material Academy, Beijing 100024, China;2.Department of Materials Science, South China University of Science and Technology, Guangzhou 510641, China) Abstract:The effect of rare earth oxides Y2O3 or CeO2 on sintering properties of Si3N4 ceramics was studied......
Fabrication and Properties of Porous Si3N4 Ceramic with High PorosityXiangming Li 1) , Litong Zhang 2) and Xiaowei Yin 2) 1) College of Water Resources and Architecture Engineering, Northwest...="ChDivSummary" name="ChDivSummary">A novel process combining oxidation-bonding and sintering was developed to fabricate porous Si3N4 ceramic with high porosity. After sintering at 1800℃, the SiO2 in porous......
infiltration using porous Si3N4 ceramic as preform. The average grain size of SiC was 30 nm. Relationship between SiC content and relative complex permittivity of Si3N4-SiC within the frequency range... GHz when the sample thickness was 2.5 mm. The excellent microwave absorbing abilities of Si3N4-SiC ceramic were attributed to the interfacial polarization at interface between Si3N4 and SiC......
等效厚度评估GaAs MMIC的Si3N4电容可靠性 黄云1,钮利荣2,林丽3 (1.电子元器件可靠性物理及其应用技术国家级重点实验室,广州,510610;2.南京电子器件研究所,南京,210016;3.华南理工大学应用物理系,广州,510641) 摘要:通过不同 GaAs MMIC的 MIM Si3N4电容结构, 运用 TDDB理论研究分析了斜坡电压下的 MIM Si3N4电容的导电特性和击穿特性,确定了 GaAs MMIC的 MIM Si3N4电容失效不是介质本征 击穿导致失效,而主要是由 Si3N4 介质的缺陷引起.基于缺陷导致介质电场击穿的原理,提出了等 效厚度模型评估和监测 GaAs MMIC的 Si3N4介质电容的质量和可靠性的新方法,可以用于工艺生 产线实现对 Si3N4介质电容的质量和可靠性进行快速评估和监测. 关键词:Si3N4电容; 等效厚度; 评估; 可靠性......
Moisture-proof and Enhanced Effect of Inorganic Coating on Porous Si3N4 Ceramic程传兵1,2,FAN Runhua2,WANG Chonghai3,WANG Hongsheng3,ZHOU Changling3,刘福田11. School of Materials Science and Engineering... Ceramics摘 要:Inorganic coating was fabricated on the surface of the porous Si3N4 ceramic by polymer derived(PD) and spraying technology, via using vinyl......
添加WC对纳米Si3N4陶瓷组织和力学性能的影响 田春艳1,刘宁1,卢茂华1 (1.合肥工业大学材料科学与工程学院,合肥,230009) 摘要:采用热压烧结制备了纳米Si3N4-WC复合陶瓷,研究了WC颗粒的添加对纳米Si3N4陶瓷组织与力学性能的影响.试验结果表明:纳米Si3N4-WC复合陶瓷的基体显微组织由粒径小于100 nm的等轴晶粒构成,WC以独立颗粒的形式存在,对显微组织影响不大;纳米Si3N4-WC复合陶瓷的硬度随WC含量的增加而升高,但低于单相纳米Si3N4陶瓷,添加适量的WC颗粒可以提高纳米Si3N4陶瓷的断裂韧性,但对抗弯强度影响不大. 关键词:纳米Si3N4陶瓷; WC; 显微组织; 力学性能; [全文内容正在添加中] ......
Si3N4陶瓷与Si3N4陶瓷及金属连接的研究进展 郑仕远1,曹优明1 (1.渝西学院化学与环境科学系,重庆402160) 摘要:对Si3N4陶瓷与Si3N4陶瓷,Si3N4陶瓷与金属的连接工艺进展进行了系统的介绍,重点评述了Si3N4直接钎焊法,Si3N4间接钎焊法,Si3N4陶瓷玻璃焊法的研究进展,并提出了今后研究的重点. 关键词:氮化硅; 连接; 钎焊; [全文内容正在添加中] ......
长颗粒(柱状晶)Si3N4陶瓷的研究及进展 尤显卿1,刘宁1,许育东1,斯庭智1 (1.合肥工业大学材料科学与工程学院,合肥,230009) 摘要:Si3N4陶瓷材料由于具有很好的高温性能及高的力学性能,而被广泛地用于结构陶瓷,如切削刀具等.然而,因为其对缺陷很敏感,故易受灾难性的失效.人们发展了多种Si3N4增韧陶瓷,其中自增韧由于一些优异的性能越来越受到人们的重视.在此文中,着重介绍了影响Si3N4陶瓷长颗粒(柱状晶)晶粒生成的因素,并介绍了国内外对长颗粒Si3N4晶的控制研究. 关键词:长颗粒(柱状)Si3N4晶粒; 自韧; 力学性能; 纳米复合; 微观设计; [全文内容正在添加中] ......
Study on Microstructure of Alumina Based Rare Earth Ceramic Composite Xu Chonghai1 (1.School of Mechanical Engineering, Shandong Institute of Light Industry, Jinan 250353, China) Abstract:Analysis techniques such as SEM, TEM and EDAX were used to investigate the microstructure of rare earth reinforced Al2O3/(W, Ti)C ceramic composite. Chemical and physical compatibility of the composite......
Al2O3对Si3N4结合SiC材料抗氧化和抗碱侵蚀性的影响 黄朝晖1,王金相1,孙加林1,洪彦若1 (1.北京科技大学 北京100083) 摘要:研究了添加0~8％Al2 O3对烧成Si3N4结合SiC耐火材料的显微结构,抗氧化和抗碱侵蚀能力的影响.借助XRD,SEM及光学显微镜观察发现:添加Al2 O3通过氮化反应烧结使得材料基质中的Si3N4由纤维状Si3N4向柱状Sialon相转化,显微结构更加致密.4#试样中的Al2O3加入量对提高Si3N4结合SiC耐火材料的抗氧化和抗碱侵蚀性的作用已极其明显. 关键词:Si3N4结合SiC; Al2O3添加物; 抗氧化性; 抗碱侵蚀性; Sialon相; Si3N4 bonded SiC; Al2O3 addition; Oxidation resistance; Alkali resistance; Sialon phase......
