使用粉末冶金模压成形和无压反应烧结方法制备出Ni3Al金属间化合物多孔材料, 研究了反应过程中Ni3Al金属间化合物多孔材料的体积膨胀、孔结构参数、组织形貌, 以及在KOH溶液中的抗腐蚀性能。结果表明: 烧结后Ni3Al金属间化合物多孔材料发生了显著膨胀, 最大孔径和开孔隙度都随着温度的升高而升高, 当温度到达750℃时体积膨胀受到限制, 最大孔径出现下降趋势; Kirkendall效应导致的镍铝偏扩散反应是体积膨胀和孔隙形成的主要原因。在碱溶液中Ni3Al金属间化合物多孔材料的腐蚀电位偏正、质量稳定, 表现出优异的抗腐蚀性能。
Porous Ni3Al alloys were fabricated by cold pressing and pressureless sintering of Ni/Al elemental powder mixtures. The swelling behavior, pore structure parameters and microstructure of porous Ni3Al during synthesis procedure have been systematically investigated. The results show that swelling effect take place after sintering. The maximum pore size and open porosity increase with increasing of temperature, but when temperature exceeds 750oC the swelling begins to suppress and the maximum pore size begins to decrease. The prime reason of the pore formation can be attributed to the Kirkendall effect in the process of reactive synthesis. The corrosion potential of porous Ni3Al in KOH solution is more positive than the other two porous compacts , and its weight is stable.
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