微晶蜡含量对17-4PH不锈钢喂料流变性的影响  

Effect of microcrystalline wax content on rheological properties of 17-4PH stainless steel feedstock

作　　者：杨忠臣[1] 李笃信[1] 卢仁伟 黎正科 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]长沙聚众冶金科技有限公司,长沙410083

出　　处：《粉末冶金材料科学与工程》2013年第6期926-930,共5页Materials Science and Engineering of Powder Metallurgy

摘　　要：研究微晶蜡含量对改进型石蜡基17-4PH不锈钢喂料流变性能的影响,比较4种喂料的综合流变因子大小,对粘结剂与金属粉末的相容性进行观测。采用毛细管流变仪测试喂料的流变性能,用扫描电镜观察喂料的形貌。结果表明:4种喂料均呈假塑性流体,微晶蜡的加入可提高喂料的流变性能,且在温度160℃、剪切速率1 000 s-1的条件下,向石蜡中加入质量分数为20%微晶蜡的喂料具有较好的综合流变性能,其综合流变学因子αstv=3.068×10-6。同时,适量微晶蜡的加入有助于提高金属粉末在粘结剂中分散的均匀性。The effect of the content of microcrystalline wax （MW） on rheological properties of 17-4PH stainless steel feedstock was studied and the comprehensive rheological indexes of four feedstocks were compared. The compatibility of binder and metal powders was observed. The rheological properties of feedstocks were tested by capilary rheological instrument, and the morphologies of feedstocks were observed by SEM. The results show that four feedstocks are pseudoplastic fluid, and adding MW to feedstocks can improve the rheological properties, putting 20% MW into the feedstock can acquire relative good comprehensive rheological properties in the condition of temperature of 160℃, shear rate of 1 000 s-1 and the comprehensive rheological index is 3.068×10-6. Meanwhile, putting MW into the feedstock can improve dispersion of binder and metal powders.

关 键 词：金属注射成形 17-4PH不锈钢 微晶蜡 流变性能 

分 类 号：TF124.39[冶金工程—粉末冶金]