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配制水雾化铁粉+1.5％Cu或+2.5％Ni+2.0％Cu的粉末混合料,进行等静压制到7.1g/cm~3密度,在网带炉中于1120℃(分解氨保护)烧结20分钟,或在步进梁式炉中于1280℃(70-30N-H_2气氛)烧结40分钟。采用在网带炉中于900℃预烧、复压和分别在1120℃和1280℃最终烧结的技术,可以得到7.4g/cm~3的密度。其显微组织。对于Fe-Cu合金,在1120℃烧结时,沿晶粒边界含有富铜相,在晶粒
A water-atomized iron powder + 1.5% Cu or + 2.5% Ni + 2.0% Cu powder mixture was prepared and isostatically pressed to a density of 7.1 g / cm ~ 3 at 1120 ° C in a belt furnace (decomposed ammonia protection) Sintered for 20 minutes or sintered in a walking beam furnace at 1280 ° C (70-30 N-H 2 atmosphere) for 40 minutes. The density of 7.4g / cm ~ 3 can be obtained by the technology of pre-sintering at 900 ℃ in reticle furnace, re-pressing and final sintering at 1120 ℃ and 1280 ℃ respectively. Its microstructure. For the Fe-Cu alloy, it contains a copper-rich phase along the grain boundaries during sintering at 1120 ° C,