复杂部件用铁基合金的注射成形工艺研究  

Study on injection molding process of complex parts for iron-based alloys

作　　者：周芬[1] 罗蒙 谢敏[1] 包金小 郜建全[1] 宋希文[1] ZHOU Fen;LUO Meng;XIE Min;BAO Jinxiao;GAO Jianquan;SONG Xiwen(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Suzhou Shareate Tools Co.,Ltd,Suzhou,215121,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]苏州新锐合金工具有限公司,江苏苏州215121

出　　处：《粉末冶金工业》2022年第2期21-26,共6页Powder Metallurgy Industry

基　　金：内蒙古自然科学基金资助项目(2018LH05019)。

摘　　要：针对常规方法无法制备出一种形状复杂及壁薄的铁基合金部件,本研究以氧化物为主要原料,以高密度聚乙烯(HDPE)、聚乙烯-乙烯乙酸乙脂共聚物(EVA)、石蜡(PW)及硬脂酸(SA)为粘结剂,研究了注射成形用喂料的最佳粘结剂的组成及最佳固含量。在此基础上,研究了正庚烷脱脂的最佳工艺,及热脱脂气氛对制品中碳氧含量的影响规律。研究结果表明,粘结剂组成为15%HDPE-75%PW-8%EVA-2%SA且最佳固含量为50%的喂料具有流动性好、注射坯强度高的特点。正庚烷脱脂的最佳工艺条件为40℃下脱脂80 min。热脱脂的气氛对最终制品中的碳、氧含量有影响,氢气气氛下脱脂时,碳含量高,氧含量低,氩气气氛下相反。氢气还原后的制品结构为铁相,且密度较高。The iron-based alloy part with complex shapes and thin walls could not be prepared by conventional methods.In this paper,the iron-based alloy part made of Fe-Ni-Co-Mo-Ti alloy was produced by powder injection molding.Oxides were used as raw materials,and high-density polyethylene(HDPE),polyethylene-ethylene ethyl acetate copolymer(EVA),paraffin(PW)and stearic acid(SA)were used as binders to study the optimal binder composition and optimal solids content for feeding.On this basis,the optimal process of n-heptane degreasing and the influence of thermal degreasing atmosphere on carbon and oxygen content in products were studied.The composition of the optimized binder system was determined by testing the relationship between the torque and time of feedstock,and combining with the quality of the green parts measuring.The optimal solids loading of feedstock was determined by torque rheometer.The microstructures of the mixed powder,the green part,the solvent-debound part,and the thermal-debound part were observed using a field emission scanning electron microscope(FESEM)and scanning electron microscopy(SEM).The mixing torque was recorded using a torque rheometer(ZJL-200)at 115℃and 45 r/min.The contents of carbon and oxygen residues in the sintered samples were measured by a carbon/sulphur determinator(CS-8810)and an oxygen and nitrogen analyzer(ON-2000),respectively.The influence of different debinding atmospheres on the carbon and oxygen residues in the sintered samples were also investigated.The densities of the sintered samples were tested using Archimedes’method.The results show that the feedstock with the binder composition of 15%HDPE-75%PW-8%EVA-2%SA and with the optimum solid con tent of 50%has a good fluidity and the green parts have high strength.The optimum condition for the binder removal of n-heptane is 80 min-40℃.The thermal debinding atmosphere affects the carbon and oxygen content of the product.When debinding in hydrogen atmosphere,the residual carbon content is high,the residual oxygen content is

关 键 词：铁基合金 注射成形 粉末装载量 脱脂 

分 类 号：TG141[一般工业技术—材料科学与工程]