(1. 杭州科技職業(yè)技術(shù)學(xué)院 機(jī)電工程學(xué)院，杭州 311402;
2. 浙江工業(yè)大學(xué) 化學(xué)工程與材料學(xué)院，杭州 310014；
3. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 以Ni、Al元素粉末為原料，采用反應(yīng)燒結(jié)工藝制備多孔NiAl金屬間化合物材料，表征各燒結(jié)溫度所對(duì)應(yīng)的孔結(jié)構(gòu)，研究NiAl燒結(jié)體的造孔機(jī)理。結(jié)果表明：在多孔NiAl金屬間化合物材料的制備過程中，當(dāng)溫度在1 100 ℃以下，隨著燒結(jié)溫度的升高，NiAl燒結(jié)體中的孔隙度和最大孔徑呈現(xiàn)增大的趨勢(shì)；經(jīng)1 100 ℃燒結(jié)之后，多孔NiAl的孔隙度為53%，最大孔徑為55 μm；造孔機(jī)理為Al熔點(diǎn)附近的Ni、Al之間的劇烈擴(kuò)散造孔形成大量的開孔隙度，以及高溫?zé)Y(jié)階段的Ni與中間相的擴(kuò)散形成的多孔NiAl材料骨架中的孔洞。
關(guān)鍵字: 多孔NiAl；金屬間化合物；孔隙度；造孔機(jī)理
（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
