还原气氛对纯铁粉压制性能的影响
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摘要
还原气氛在铁粉精还原退火过程中清除杂质和氧化物,进一步提高粉末化学纯度,对压制性能有重要影响。通过LAP100.29生粉在同种生产工艺、不同还原气氛中的退火还原试验,研究还原气氛对纯铁粉压制性能的影响。结果表明:不同还原气氛对铁粉的压制性能影响不同,氨分解氢较甲醇制氢还原纯铁粉在600 MPa时的压缩密度低0.02 g/cm~3;相同混合粉配方的脱模膨胀率和烧结膨胀率均比甲醇制氢还原粉偏高。
The reducing atmosphere is an important factor in reduction for removing impurities and oxides from iron powder to improve the chemical purity. It has an important effect on pressing properties. Through annealing reduction tests of LAP100.29 raw powder in the same production process and different reducing atmosphere,the influence of reducing atmosphere on the pressing performance of pure iron powder was studied. The results show that different reducing atmospheres have different effects on the pressing properties of iron powder,and the compression density of pure iron powder at 600 MPa reduced by hydrogen from ammonia decomposition is 0.02 g/cm~3 lower than that reduced by hydrogen from methanol. Demoulding expansion rate and sintering expansion rate of pure iron powder reduced by hydrogen from ammonia decomposition are also higher than those reduced by hydrogen from methanol.
The reducing atmosphere is an important factor in reduction for removing impurities and oxides from iron powder to improve the chemical purity. It has an important effect on pressing properties. Through annealing reduction tests of LAP100.29 raw powder in the same production process and different reducing atmosphere,the influence of reducing atmosphere on the pressing performance of pure iron powder was studied. The results show that different reducing atmospheres have different effects on the pressing properties of iron powder,and the compression density of pure iron powder at 600 MPa reduced by hydrogen from ammonia decomposition is 0.02 g/cm~3 lower than that reduced by hydrogen from methanol. Demoulding expansion rate and sintering expansion rate of pure iron powder reduced by hydrogen from ammonia decomposition are also higher than those reduced by hydrogen from methanol.
引文
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