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Null 包大杰1 (1.上海柴油机厂,上海,200432) 摘要: 问:何谓钢铁中全碳量(总碳量)和游离碳?答:碳在钢,铁中主要以化合状态和游离状态存在.在钢中主要以铁的碳化物如:Fe3C,Fe23C6等以及与某些合金元素的碳化物如:Mn3C,WC,TiC,MoC,VC,Cr3C2,Cr6C2等形式存在,统称为化合碳,钢中很少有游离碳.在铁中碳除以化合碳存在外,还以游离状态(石墨碳)存在,而且是主要形式.但是在白口铁中则多以碳化铁(Fe3C)形式存在. [全文内容正在添加中] ......
Preparation of high-purity tantalum ethoxide by vacuum distillation YANG Sheng-hai(杨声海)1, CHEN Yong-ming(陈永明)1, YANG Hai-ping(杨海平)1, LIU Yin-yuan(刘银元)1, TANG Mo-tang(唐谟堂)1, QIU Guan-zhou(邱冠周)2...; Abstract: Effects of reflux ratio, water addition and content of water in ethanol on the purity and yield of tantalum ethoxide during vacuum distillation were......
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Electrochemical synthesis and characterization of tantalum alkoxides YANG Sheng-hai(杨声海)1, CAI Ya-nan(蔡亚楠)2, YANG Hai-ping(杨海平)1, JIN Sheng-ming(金胜明)2 1. School of Metallurgical Science...; Abstract: Tantalum(Ⅴ) propoxide (Ta(OPrn)5), isopropoxide (Ta(OPri)5) and butoxide(Ta(OBun)5) were synthesized by electro- chemical reactions of corresponding alcohol at sacrificial tantalum anode......
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Synthesis and characterization of tantalum nitride nanopowder prepared through homogeneous reaction MA Chun-hong(马春红)1, 2, ZHANG Wei-feng(张威峰)1, HE Ji-lin(何季麟)2, ZHU Hong-min(朱鸿民)1 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Ningxia Orient Tantalum Industry Ltd., Shizuishan 753000, China Received 15 July......
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Engineering, Guizhou University, Guiyang 550003, China) Abstract: Tantalum metal was prepared by solid oxygen-ion conducting membrane (SOM) technology from Ta2O5 directly in molten CaCl2. Through... the rate of deoxidization. Contrarily, small porosity results in the formation of compact out-layer of tantalum metal. While the Ta2O5 pellet pressed by 4 MPa and sintered at 1 150 ℃ for 2 h has appropriate......