应用了一种新颖的微型超声粉末模压成型方法(micro-UPM)成型超高分子量聚乙烯(UHMWPE)微塑件.先利用超声振动使UHMWPE粉末自身快速加热并塑化,之后在合模压力下快速充填微型腔,成功制备了多种规格的微塑件.差示扫描量热实验结果表明,micro-UPM UHMWPE微塑件为两相状态,由初生态和熔化-再结晶态两相组成.在超声塑化时间为0.5～1.5 s的范围内,熔化-再结晶相熔融峰面积逐渐增大,而初生态相熔融峰面积逐渐缩小,结晶度逐渐减小.当超声塑化时间为1.Ss时,微塑件结晶度达到最小值54.3％,而熔化-再结晶相分数达最大值98.3％,micro-UPMUHMWPE微塑件塑化质量最佳.单晶X射线衍射实验表明,微塑件中间区的结晶度数值比表层大,与普通注塑成型的微塑件相比,micro-UPM微塑件的结晶取向性不明显.
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