润滑剂含量不同时W-Ni-Fe合金的温压行为

Warm compacting behavior of W-Ni-Fe alloy with different lubricant contents

研究90W-7Ni-3Fe合金的温压成形工艺,探讨润滑剂含量不同时温压行为对硬粉的作用,并比较温压工艺与常温压制工艺的不同。结果表明:在相同单位压制压力下,温压压坯密度明显高于常温压制的;润滑剂含量为0.6%(质量分数)时压坯密度达到最大值,温压压制与常压压制相比,压坯密度增加0.26 g/cm3;润滑剂含量超过0.6%后,压坯密度又逐渐下降;添加润滑剂后合金的脱模力明显降低,其温压脱模力较常压脱模力小;试样的抗拉强度、伸长率在润滑剂含量为0.6%时达最大值,这与烧结体的密度随润滑剂含量的变化一致;同时温压烧结坯的密度与常压试样的区别不明显,但抗拉强度和伸长率都高于同批的常压试样。

The warm compacting process of 90W-7Ni-3Fe alloys was discussed. The warm compacting behavior of hard powders with different lubricant contents, and the difference between room-temperature （RT） compaction and warm compaction was investigated. The results indicate that the relative density of greens via warm compaction is clearly higher than that of greens via RT compaction under the same compacting pressure. The highest green density is obtained in the sample via warm compaction with 0.6% lubricant, 0.26 g/cm3 higher than that of samples compacted at RT. When the lubricant addition is more than 0.6%, the green density decreases. The greens containing lubricant obviously have a decrease in ejecting force, and also the ejection force in warm compaction is lower than that in RT compaction. Both the tensile strength and elongation reach the highest values in the sample with 0.6% lubricant, which is in agreement with the change of sintered density as a function of lubricant content. Although little difference exists between the densities obtained by RT compaction and warm compaction, the warm compaction leads to higher tensile strength and elongation.