多孔NiAl金属间化合物的造孔机理
来源期刊：中国有色金属学报2013年第2期
论文作者：董虹星 刘秋平 贺跃辉 吴靓
文章页码：474 - 480
关键词：多孔NiAl；金属间化合物；孔隙度；造孔机理
Key words：porous NiAl; intermetallics; porosity; pore formation mechanism
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55 μm；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。
Abstract: 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.
董虹星1，刘秋平2，贺跃辉3，吴 靓3
(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)
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55 μm；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。
关键词：多孔NiAl；金属间化合物；孔隙度；造孔机理
DONG Hong-xing1, LIU Qiu-ping2, HE Yue-hui3, WU Liang3
(1. College of Electromechanical Engineering, Hangzhou Polytechnic, Hangzhou 311402, China;
2. College of Chemical Engineering and Material Science, Zhejiang University of Technology, Z)
Abstract: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.
Key words:porous NiAl; intermetallics; porosity; pore formation mechanism
