摘要
研究了铁粉温压压坯在真空和氢气中的烧结行为。压制铁粉时，粉末温度为110℃，模具温度为80～100℃。烧结时，压坯于室温装炉，升温速度为2.5℃／min。烧结温度分别为1100℃1150℃和1250℃。实验发现，不同温度下真空烧结1h和氢气中烧结1h，与压坯密度相比较烧结密度都降低，生坯密度越高，烧结密度下降越多。测量了真空或氢气中低温预烧结前后压坯重量和体积变化和不同预烧结制度对应的最终烧结密度，发现经真空预烧结后的压坯在1250℃真空烧结，可有效地提高温压压坯的烧结密度。实验表明，烧结铁的密度是温压及烧结两个过程综合作用的结果。在选择温压温度和方式时，有必要考虑温压压坯的烧结行为。
Vacuum sintering and sintering in hydrogen atmosphere of warm-compacted green compacts has been studied.During compacting of iron powders, the temperature of iron powders was 110℃, the temperature of the die tool was 80～100℃. During sintering, the green compacts were loaded at the room temperature, the heating up rate was 2. 5℃/min.The sintering temperatures were 1100, 1150 and 1250 ℃ respectively. Experimental results show that sintering densities of all compacts decrease after sintering at all given temperature for 1h in vacuum or in hydrogen atmosphere. Variations of weight and volume of the compacts after sintering and the final sintered densities through pre-sintering were measured,finding that high temperature sintering at 1250℃ with pre-sintering can effectively enhance the final sintering densities of the green compacts. The present study indicates that the density value of sintered iron is consequent results of the combination effect of warm-compacting and sintering. One of two processing may lead to the variation in the final density of the compacts. And although warm compaction may increase the density of the green compact, the sintering behavior of warm-compacted green compacts should be taken into account for optimizing the temperature and specification of warm-compaction.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
1999年第2期107-110,共4页
Powder Metallurgy Technology
关键词
粉末冶金
温压
烧结
铁基制品
铁粉
powder metallurgy
warm compaction
sintering
iron based compacts
