(广州有色金属研究院 粉末冶金研究所，广州 510650)
摘 要: 采用高速压制(HVC)技术成形Ti粉，研究润滑剂、两次压制对成形效果的影响，探讨适合HVC技术特点的表征方式。结果表明：与高速压制纯Ti粉相比，含0.3%(质量分数)润滑剂的粉末能在更大的冲击行程下成形而获得更高的压坯密度，并且有利于减少表面剥落和分层等缺陷；两次高速压制时，压坯内应力聚集导致分层和烧结后出现膨胀；HVC的成形效果同时取决于冲击能量和装粉量，质量能量密度能全面表征装粉量和冲击能量等不同参数下的压坯密度；纯Ti粉末在质量能量密度为118 J/g时，所获得的压坯致密度为96.0%。
关键字: Ti粉；高速压制(HVC)；分层；质量能量密度
（Department of Powder Metallurgy, Guangzhou Research Institute of Nonferrous Metals, Guangzhou 510650, China）
Abstract:High velocity compaction (HVC) was adopted to press Ti powder. The effects of lubricant and two impacts on the green bodies were investigated, and the representation of HVC was discussed. The results indicate that compared with pure Ti powder without lubricant, the powder containing 0.3% (mass fraction) lubricant is able to form at larger stroke length to attain higher green density. In addition, green surface peeling and delamination of this powder are lessened. For two impacts, stress gets together in the green body and causes delamination and swell after sintering. The forming ability of HVC lies on impact energy and powder filling amount simultaneously. Therefore, mass energy density can characterize the green density achieved at different powder filling amount and impact energy. For pure Ti powder, the green relative density is 96.0% when the mass energy density is 118 J/g.
Key words: Ti powder; high velocity compaction; delamination; mass energy density
