多孔NiAl金属间化合物的造孔机理  

Pore formation mechanism of porous NiAl intermetallics

作　　者：董虹星[1] 刘秋平[2] 贺跃辉[3] 吴靓[3] 

机构地区：[1]杭州科技职业技术学院机电工程学院,杭州311402 [2]浙江工业大学化学工程与材料学院,杭州310014 [3]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2013年第2期474-479,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重大基础研究发展计划资助项目(2009CB623406);国家杰出青年基金资助项目(50285102);国家自然科学基金资助项目(50721003)

摘　　要：以Ni、Al元素粉末为原料,采用反应烧结工艺制备多孔NiAl金属间化合物材料,表征各烧结温度所对应的孔结构,研究NiAl烧结体的造孔机理。结果表明:在多孔NiAl金属间化合物材料的制备过程中,当温度在1 100℃以下,随着烧结温度的升高,NiAl烧结体中的孔隙度和最大孔径呈现增大的趋势;经1 100℃烧结之后,多孔NiAl的孔隙度为53%,最大孔径为55μm;造孔机理为Al熔点附近的Ni、Al之间的剧烈扩散造孔形成大量的开孔隙度,以及高温烧结阶段的Ni与中间相的扩散形成的多孔NiAl材料骨架中的孔洞。The porous NiAl intermetallic was prepared using Ni, Al elemental powders as raw material through reaction sintering process, and the pore structures corresponding to the sintering temperature was also characterized. The results show that the porosity of porous NiAl intermetallic compounds during the preparation increases with the sintering temperature increasing, The porosity in the sintered body and the maximum pore size of porous NiAl are about 53% and 55 μm, respectively, at 1 100 ℃. The pore formation mechanism of porous NiAl is that the large number of open porosity forms by the dramatic interdiffusion reaction between Ni and Al near the Al melting point temperature, and the porosity in the porous material skeletons forms by the interdiffusion reaction between the Ni and intermediates at high temperature.

关 键 词：多孔NiAl 金属间化合物 孔隙度 造孔机理 

分 类 号：TG15[金属学及工艺—热处理]