一种蜡基粉末注射成形粘结剂的研究  

An investigation of ceryl powder injection molding binder

作　　者：陈强[1] 李丹丹[1] 蔡一湘[1] 谭立新[1] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院),广东广州510650

出　　处：《材料研究与应用》2014年第2期103-107,共5页Materials Research and Application

摘　　要：以石蜡基注射成形粘结剂为研究对象,通过对由石蜡（PW）、聚乙烯（PE）及聚丙烯（PP）等组成的注射成形粘结剂进行改进,用乙烯-乙酸乙烯酯共聚物（EVA）代替原有的聚丙烯,同时对改进后的粘结剂与原来的粘结剂进行了对比试验.试验结果表明：改进后的粘结剂的粉末填充量从原来的54%增加到60%,塑化时间只有原来的1/10,且二次浇口料也能较好的注形,喂料的性能得到了整体性的提高;注射工艺周期从原来的120~150s缩短至36~42s;成品率从原来的75%左右,提高至98%以上;脱脂工艺和烧结变形易于控制,制品的尺寸公差为±0.4%.By improving the binder of injecting molding composed of PW,PE（polyethylene）and PP（polypropylene）,PP（polypropylene）was replaced with EVA（ethylene-acetic acid vinyl ester）and new binder was investigated taking the paraffin（PW）as the principal thing of the binder of injecting molding.The test results showed that the powder filling amount increased from 54% to 60% and the plasticizing time decreased to one tenth of primary time after improving binder;also the twice pouring feed could note shape better,the performance of feed was improved entirely;injection cycle shortened from 120-150s to 36-42s;the rate of final products increased from 75% to more than 98%;it is easy to control degrease and sintering deformation,the dimensional precision is controlled about 0.40%.

关 键 词：注射成形 粘结剂 粉末填充量 

分 类 号：TF124[冶金工程—粉末冶金]