采用粉末注射成形方法制备了钛合金坯体,然后利用溶剂脱脂方法脱除坯体中可溶性粘结剂.通过对溶剂脱脂动力学分析表明,在脱脂过程中,存在动力学控制步骤转化的过程,提出了脱脂临界厚度的概念.当厚度超过5 mm时,试样脱脂过程受扩散控制,在常温下进行溶剂脱脂时,其扩散系数为1.86×10-6 cm2.s-1,活化能为12.96 KJ.mol-1.K-1;在厚度小于5 mm时,试样脱脂过程受粘结剂溶解和扩散混合控制.
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