摘要
金属 气体共晶定向凝固 (Gasar)是一种制备规则多孔金属的新工艺。利用自行开发的Gasar装置 ,成功制备了具有规则气孔分布的藕状多孔金属Mg ,并研究了铸型预热温度和气体压力等工艺参数对气孔率、气孔大小和分布的影响。结果表明 :提高铸型预热温度可以完全消除无气孔金属壳 ;随着氢气压力的增大 ,铸锭的平均直径都在减小 ;在整个Gasar凝固中约有 8%左右的氢气溢出。
Metal-gas eutectic directional solidification (Gasar) ia a novel technology for preparing lotus-type metals with oriented pores parallel to the solidification direction. We developed a Gasar apparatus to have successfully prepared lotus-type porous Mg samples. Effects of technological parameters, including preheating temperature of cast mold and gas pressure, on gas-hole rate, gas-hole size and gas-hole distribution in the lotus-type porous Mg were investigated. The results indicate that gas holes in metal shell can be eliminated by the increase of the preheating temperature of cast mold. Average diameters of the ingot decrease with hydrogen pressure increase.About 8% hydrogen is overflowed during the total Gasar solidification.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2005年第1期1-4,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目 (50 4 0 4 0 0 2 )
教育部博士点基金资助项目 (2 0 0 2 0 0 0 30 86)
航天技术创新基金资助项目 (0 32 0 0 31 0 1 0 1 )
关键词
多孔金属
共晶
定向凝固
藕状结构
Porous Metal, Eutectic, Directional Solidification, Lotus-type Structure
