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	固/气共晶定向凝固中的工艺判据
	张华伟 ; 李言祥 ; 刘源 ; ZHANG Huawei ; LI Yanxiang ; LIU Yuan
	2010-06-08 ; 2010-06-08
关键词	多孔金属 固/气共晶 定向凝固 气体逸出 藕状结构 Gasar porous metal solid/gas eutectic directional solidification gas escaping lotus-type structure Gasar TG111.4
其他题名	THE CRITICAL PROCESSING CONDITIONS FOR DIRECTIONAL SOLIDIFICATION OF SOLID/GAS EUTECTICS
中文摘要	气体压力和熔体过热度决定熔体中气体溶解量从而直接影响多孔试样的气孔率．通过理论分析建立了固/气共晶定向凝固中气体逸出和藕状多孔结构形成所需的过热度和气体压力判据．以金属/氢共晶为例．计算结果表明,过热度和氩气分压均应有一适中的范围,给定氢气和氩气分压时,过热度应高于藕孔形成临界过热度而低于氢气逸出临界过热度;给定过热度和氢气分压时,氩气分压应高于氢气逸出临界氩气分压而低于藕孔形成临界氩气分压．该分析结果从藕状多孔Mg的实验结果得到了验证,可以作为高质量规则多孔材料实际制备过程的工艺参数指导原则．; Among all the processing parameters which affect porous structure obtained by di- rectional solidification of a solid/gas(e.g.metal/hydrogen)eutectic(Gasar),the gas pressure above melts and the superheating temperature of melts are the most observable and easily governed because they directly control the amount of hydrogen saturated in melts.The critical processing conditions for hydrogen to escape and for formation of lotus-type porous structure have been deduced through theoretical analysis and calculation.The results show that both the superheating temperature and the argon partial pressure should have moderate values,viz.with given partial pressures of hydrogen and argon,the superheating temperature should be bigger than the threshold of formation of lotus-type structure and smaller than that of hydrogen to escape;however,with given superheat degree and hy- drogen partial pressure,the argon partial pressure should be bigger than the threshold of hydrogen to escape and smaller than that of formation of lotus-type porous structure.These conclusions were verified by the experimental results of lotus-type porous Mg and will contribute to the fabrication of high-quality regular porous metals by Gasar process.; 国家自然科学基金项目50404002; 国家重点基础研究发展计划项目2004CCA05100资助~~
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/48440]
专题	清华大学
推荐引用方式 GB/T 7714	张华伟,李言祥,刘源,等. 固/气共晶定向凝固中的工艺判据[J],2010, 2010.
APA	张华伟,李言祥,刘源,ZHANG Huawei,LI Yanxiang,&LIU Yuan.(2010).固/气共晶定向凝固中的工艺判据..
MLA	张华伟,et al."固/气共晶定向凝固中的工艺判据".(2010).

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