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以单质Fe粉和Cr粉为原料,采用粉末冶金法制备了Fe-25Cr合金。研究了压制压力、烧结温度和烧结时间对合金致密度和显微组织的影响。结果表明,烧结坯体的最终密度在所研究的范围内与压制压力、烧结温度、烧结时间成正比,但当烧结温度为1 300℃,烧结坯体的晶粒明显发生长大。粉末冶金法制备高致密度Fe-25Cr合金的最佳工艺参数为:压制压力800 MPa,烧结温度1 280℃,烧结时间60 min,所得到烧结坯体的相对密度为95.23%,实际密度为7.313 5 g/cm3。
Fe-25Cr alloy was prepared by powder metallurgy with Fe powder and Cr powder as raw materials. The effects of pressing pressure, sintering temperature and sintering time on the density and microstructure of the alloy were investigated. The results show that the final density of the sintered body is proportional to the pressing pressure, the sintering temperature and the sintering time. However, when the sintering temperature is 1300 ℃, the grains of the sintered body obviously grow up. The optimum technological parameters for the preparation of high density Fe-25Cr alloy by powder metallurgy are as follows: the compaction pressure is 800 MPa, the sintering temperature is 1,280 ℃, the sintering time is 60 min, the relative density of sintered body is 95.23% and the actual density is 7.313 5 g / cm3.