石蜡接枝马来酸酐对碳化钨粉末注射成形专用料性能的影响  

Effect of Maleic Anhydride on Performance of Paraffin Based Tungsten Carbide Powder Injection Molding Special Materials

作　　者：章诚 史安康 曹峥 吴盾 ZHANG Cheng;SHI Ankang;CAO Zheng;WU Dun(School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164

出　　处：《常州大学学报（自然科学版）》2018年第5期17-22,41,共7页Journal of Changzhou University：Natural Science Edition

摘　　要：通过熔融法制备石蜡(PW)接枝马来酸酐(MAH)的共聚物,并分别用石蜡与石蜡接枝马来酸酐(PW-gMAH)作为粘结剂制备碳化钨(WC)粉末注射成形专用料。利用红外光谱仪、旋转流变仪、热重分析仪等研究了MAH的引入对专用料性能的影响。结果表明:马来酸酐成功接枝到石蜡上;PW-g-MAH制备的专用料弯曲强度远高于PW制备的专用料强度,但MAH的引入并不影响专用料的复数黏度;MAH的引入提高了专用料在中温区的活化能,因此设计碳化钨粉末注射成形专用料的一步热脱脂工艺时,要适当延长PW-g-MAH制备的专用料在中温区脱脂的升温速率和保温时间。Paraffin（PW）grafted maleic anhydride（MAH）was prepared by melt method.MAH grafted with PW and pureparaffin were used to prepare tungsten carbide（WC）powder injection molding compound,respectively.The properties of special materials prepared from paraffin and paraffin grafted maleic anhydride were studied by infrared spectroscopy,rotational rheometer and thermogravimetric analyzer,respectively.The results showed that maleic anhydride was successfully grafted onto paraffin wax.The powder loading of special material for the injection molding of tungsten carbide powder was 57%.The bending strength of the special material prepared by paraffin wax grafted MAH was much higher than that of paraffin wax.However,compared with paraffin,PW grafted with MAH did not affect the complex viscosity of specialty materials.Compared with the special material prepared from paraffin,the PW grafted with MAH increased the activation energy of the special material in the mid-temperature zone.Therefore,when designing an one-step hot degreasing process for the injection molding of tungsten carbide powder,degreasing heating rate and holding time in the medium temperature zone should be properly extended.

关 键 词：石蜡 马来酸酐 复数黏度 热脱脂 碳化钨 

分 类 号：TF124.39[冶金工程—粉末冶金]