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利用无压反应烧结工艺制备纳米Al2O3颗粒增强多孔Fe–Cr–Ni复合材料,研究成型预压压力和烧结工艺对多孔金属基复合材料的高温弯曲强度和抗氧化性能的影响。结果表明,对于原始粉末的初压成坯,不同的压力导致不同的初坯密度和颗粒与颗粒之间的间隙,烧结后得到的样品含有不同的气孔率和相组成;由于金属基体在实验温度提高时开始软化以及气孔率会降低,在其共同作用下样品的高温强度先降低后缓慢升高;预压压力增加而导致的样品孔隙率较低,说明试样在氧化过程中接触氧的表面积较小,有助于提高复合材料的抗氧化性能。
The porous Fe-Cr-Ni composite was prepared by pressureless reaction sintering process and the effect of pre-compression pressure and sintering process on the flexural strength and oxidation resistance of porous metal matrix composites at high temperature was studied. The results show that the initial pressure of the original powder into the blank, different pressures lead to different initial density and the gap between the particles and the particles obtained after sintering samples containing different porosity and phase composition; as the metal matrix at the experimental temperature The softening and porosity of the samples begin to increase as the temperature increases, and the temperature of the sample decreases slowly and then increases slowly. The increase of the pre-pressure increases the porosity of the sample, which indicates that the sample is exposed to oxygen during the oxidation process Small, helps to improve the composite’s oxidation resistance.