17-4PH金属注射成形(MIM)材料缺陷的实验分析  

ANALYSIS OF DEFECTS OF MIM17-4PH GREEN PARTS

作　　者：顾虎[1] 李峥[1] 毕景维[1] 马远飞[1] 曹勇家[1] 

机构地区：[1]安泰科技股份有限公司,北京100081

出　　处：《粉末冶金工业》2005年第5期5-10,共6页Powder Metallurgy Industry

基　　金：国家"863"项目(No.2001AA337050);北京市科委高新技术产业化项目(H20040290)

摘　　要：研究了注射成形生坯厚度与缺陷产生的临界升温速度的关系。实验结果证明,热脱粘缺陷主要表现为开裂缺陷与气泡孔缺陷。注射成形时生坯中所形成的气孔和粘结剂中高分子聚合物组元热解产生的气孔是造成缺陷的主要原因。MIM17-4PH烧结坯中残留的微孔隙使制品难以完全致密化,并造成缺陷。采用溶剂萃取-热解二步脱粘工艺达到了无缺陷脱粘的目的。The relationship between thickness of MIM green parts and critical heating rate was studied.Results showed that the defects formed during debinding caused by porosity in grcen parts and polymer pyrolysis are cracks and bubbles.The remained micro-porosity makes densifcation of MIM17-4PH difficult.The defect-free component can be obtained by solvent-thermal debinding method.

关 键 词：金属注射成形 热脱粘 烧结 缺陷 

分 类 号：TF124.39[冶金工程—粉末冶金]