共搜索到11381条信息,每页显示10条信息,共1139页。用时:0小时0分0秒523毫秒
......
体经800 ℃还原1 h后,样品中的W2C和WC完全消失,得到纯净的W粉,而且W的衍射峰有明显的宽化,说明此时W粉的粒度有所细化. 图1 W,C摩尔比为1:2.6的前驱体及前驱体在不同温度下还原1 h后产物的XRD谱 Fig. 1 XRD patterns of precursor with tungsten carbon molar ratio of 1:2.6...SEM像 Fig. 2 SEM images of products prepared by carbon assisting hydrogen reduction of precursor with tungsten carbon molar ratio of 1:2.6 at different temperatures for 1 h 而C与H2O反应生成的CO会与W发生反应生成......
......
Key laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. School of Physics Science and Technology, Central South University, Changsha 410083, China) Abstract: The W18O49 submicron-rod arrays were grown on tungsten substrate by vapor deposition using WO3 powders as raw material. The morphology and structure of the resultant tungsten oxide submicron-rods were......
......
, Zhi-hong PENG, Gui-hua LIU School of Metallurgy and Environment, Central South University, Changsha 410083, China Received 18 May 2018; accepted 27 February 2019 Abstract: Pyrochlore-type tungsten... to the efficient preparation of PTO powder and cleaner tungsten metallurgy. Key words: pyrochlore-type tungsten oxide; ammonium tungstate solution; ferrous ion; crystallization; mechanism 1 Introduction......
......
词: 氧化钨; 绒球状结构; 微米管; 纤维 中图分类号: TF123 文献标识码: A Synthesis of tungsten oxide with pompon-like structure GAO Li1, WANG Shi-liang2, 3, HE Yue-hui2, HUANG Bai-yun2 (1. Hunan Cofly New Energy Source Co Ltd, Changsha 410075, China; 2. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China; 3. School of Physics Science and Technology, Central South......
......
J. Cent. South Univ. (2012) 19: 1773-1779 DOI: 10.1007/s11771-012-1206-z Effect of inclusion on high cycle fatigue response of a powder metallurgy tool steel YAO Jun(姚君)1,2, QU Xuan-hui(曲选辉)1,2, Rafi... fatigue response of a high V-alloyed powder metallurgy tool steel (AISI 11) with different inclusion sizes was studied. Two materials of this grade at a similar hardness of about HRC 60 were subjected......