采用机械合金化方法制备了Cr含量为30％(质量分数)的两相颗粒极细的Ag-Cr合金,在700℃,800℃及0.1MPa纯氧气中氧化时,机械合金化Ag-30Cr合金外层为Ag层,其下方为复合氧化物AgCrO2,最内层为连续的Cr2O3,这一结构不同于粗晶粒粉末冶金Ag-Cr合金的复杂的混合氧化膜.这主要是由于晶粒的细化加快了Cr颗粒的溶解,加速了Cr从合金到膜的扩散,从而有效地促进Cr2O3层的形成. A two-phase Ag-Cr alloy with a Cr content of 30% (mass fraction) was prepared by mechanical alloying. When the alloy was oxidized in pure oxygen at 700 ℃, 800 ℃ and 0.1MPa, the alloy Ag-30Cr The outer layer is Ag layer, the bottom of which is composite oxide AgCrO2, and the innermost layer is continuous Cr2O3, which is different from the complex mixed oxide film of coarse grain powder metallurgy Ag-Cr alloy, which is mainly due to the grain The refinement accelerates the dissolution of Cr particles and accelerates the diffusion of Cr from the alloy to the film, thereby effectively promoting the formation of the Cr2O3 layer.