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使用粉末冶金模压成形和无压反应烧结方法制备出Ni_3Al金属间化合物多孔材料,研究了反应过程中Ni_3Al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Ni_3Al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Ni_3Al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。
The Ni_3Al intermetallic compound porous materials were prepared by powder metallurgy press molding and pressureless reaction sintering. The volume expansion, pore structure parameters, microstructure and pore structure of Ni_3Al intermetallic compound porous materials during the reaction were studied. Corrosion performance. The results show that the porous Ni_3Al intermetallic compound expands significantly after sintering, and the maximum pore diameter and open porosity increase with increasing temperature. When the temperature reaches 750 ℃, the volume expansion is limited and the maximum pore diameter decreases. The Ni-Al partial diffusion reaction caused by Kirkendall effect is the main reason for volume expansion and pore formation. Corrosion potential of Ni_3Al intermetallic compound porous material in alkaline solution is positive, and its quality is stable, showing excellent corrosion resistance.