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SiC Nanowires Toughed HfC Ablative Coating for C/C CompositesHejun Li,Yongjie Wang,Qiangang Fu,Yanhui ChuState Key Laboratory of Solidification Processing,Northwestern Polytechnical University摘 要:In order to improve ablation resistance of carbon/carbon(C/C) composites,SiC nanowires were prepared on C/C composites surface in prior through chemical vapor......
Si粉在空气中燃烧合成Si3N4粉体 崔猛1,林志明1,李江涛1,杨筠1 (1.中国科学院,理化技术研究所,北京,100080;2.中国科学院,研究生院,北京,100049) 摘要:经20h机械活化后的Si粉,在空气中可以实现自燃烧合成反应,并表现出二次燃烧现象.燃烧产物的表层与内部具有显著不同的特征,表层产物中以α-Si3N4为主相,并有少量Si2N2O相和非晶SiO2共存,内部为整块的灰白色松散Si3N4粉体,其相组成与反应条件有关.本文研究了经机械活化(MA)处理后的硅粉在空气中燃烧反应的整个过程,证实了机械活化处理后的Si粉在空气中燃烧的可行性,分析了燃烧产物主要是Si3N4而不是SiO2的原因,并通过调整成份实现了对产物相组成的控制. 关键词:机械活化; 空气中燃烧; Si3N4; [全文内容正在添加中] ......
and Engineering,Shenzhen University摘 要:Silver nanowires have attracted wide research attention for their excellent optical,electrical and chemical properties.Many researches were performed toward synthesizing and application of silver nanowires.The application of silver nanowires such as transparent conductive film electrode,conductive silver adhesive......
P-doped Germanium Nanowires with Fanobroadening in Raman Spectrum何亮,XIONG Biao,ZHOU Peng,LUO Wen,SONG Peishuai,WANG Xukun,HAO Zhimeng,YANG Xiao,NIU Chaojiang,TIAN Xiaocong,YAN Mengyu,麦立强State Key... germanium(Ge) nanowires and P-doped Ge nanowires on Si(111) substrate were investigated,the phosphorus(P)-doping in Ge nanowires was also characterized.Vapor liquid solid-low pressure chemical vapor......
助烧剂对无压烧结Si3N4力学性能的影响 金日梅1,贾德昌1,周玉1 (1.哈尔滨工业大学 哈尔滨 150001) 摘要:研究了三种助烧剂MgO,Al2O3+AlN和Y2O3+AlN对1 800℃×3 h工艺下无压烧结Si3N4力学性能的影响情况.发现材料力学性能主要决定于助烧剂的种类,其次取决于含量.其Y2O3+AlN虽使最终生成的β-Si3N4长径比较小,线度尺寸最短,但最利于致密化,因而使材料力学性能最佳,添加量(质量分数)为12%Y2O3+6%AlN时,陶瓷的抗弯强度,断裂韧性和维氏硬度分别达到431.6 MPa,5.10 MPa*m1/2和14.52 GPa. 关键词:助烧剂; Si3N4; 力学性能; 无压烧结; [全文内容正在添加中] ......
Superhydrophobic diamond-coated Si nanowires for application of anti-biofoulingWenjing Long1,2,Haining Li1,2,Bing Yang1,Nan Huang1,Lusheng Liu1,Zhigang Gai3,Xin Jiang11. Shenyang National Laboratory...-fouling performance has been investigated. The Si nanowires prepared by a metal-assisted chemical etching technique exhibit a super-hydrophilic surface. The treatment in CH4/H2 gas plasma environment......
Mechanical properties of Mn-doped ZnO nanowires studied by first-principles calculationsZhan-jun Gao, You-song Gu, Xue-qiang Wang, and Yue Zhang School of Materials Science and Engineering... nanowires and to study the doping and size effects. A series of strains were applied to ZnO nanowires in the axial direction and the elastic moduli of ZnO nanowires were obtained from the energy versus......
表面活性剂对Si3N4注射成型的影响 司文捷1,苗赫濯1,熊滔1,颜鲁婷2 (1.清华大学新型陶瓷与精细工艺国家重点实验室,北京,100084;2.北京交通大学,北京,100044) 摘要:就硬脂酸(SA)及硅烷KH570两种不同的表面活性剂对注射成型各阶段的影响进行了研究.实验证明:硬脂酸在降低原始粉料混合粘度时所起的作用明显;硅烷KH570在降低经过表面氧化处理的Si3N4粉料混合粘度时作用效果明显;不同表面活性剂及不同用量对脱脂效果影响不大;但随着表面活性剂用量增加,烧结体密度逐渐减小,同样硬度也逐渐减小.但当溶剂脱脂应用于脱脂阶段时,烧结体性质在密度,硬度方面都有所提高,表面活性剂的影响不再呈明显的规律性. 关键词:表面活性剂; 粘度; 密度; Si3N4; CIM; [全文内容正在添加中] ......
Large-scale Growth of Copper Oxide Nanowires on Various Copper SubstratesYumei Yue1,Mingji Chen2,Yang Ju21. Faculty of Aerospace Engineering,Shenyang Aerospace University2. Department of Mechanical Science and Engineering,Nagoya University摘 要:Large-scale growth of copper oxide nanowires was realized on surfaces of various copper-containing substrates......
晶种对自增韧Si3N4显微结构和性能的影响 张立同1,吕杰2,刘伯操2 (1.西北工业大学,西安,710072;2.北京航空材料研究院,北京,100095) 摘要:采用热压烧结-高温气压处理的方法研究了棒状β-Si3N4晶种对La2O3-Y2O3系自增韧Si3N4显微结构和性能的影响.结果表明,加入晶种将在组织中引入粗大柱状β-Si3N4晶粒,分布均匀;随着晶种加入量的增加,粗大柱状β-Si3N4晶粒数量增加,组3织明显粗化.当晶种加入量较小时(10vol%),材料具有较高的断裂韧性(~12MPam1/2),同时保持较高的强度(800~900MPa),而当晶种加入量较大时,则表现为抗弯强度的明显下降.分析表明,大晶粒直径及其面积百分数是影响断裂韧性的主要因素. 关键词:晶种; 自增韧性Si3N4; 显微结构; 力学性能; 粗大柱状晶; [全文内容正在添加中] ......
