凝胶注模法制备复杂形状钨铜复合材料  

Gel-casting Preparation of W-Cu Composites with Complex Shape

作　　者：陶庆良 魏瑶瑶[1] 李邦怿 谢海林 吴坷 朱玉斌[1] TAO Qing-liang WEI Yao-yao LI Bang-yi XIE Hai-lin WU Ke ZHU Yu-bin(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, Chin)

机构地区：[1]上海大学材料科学和工程学院,上海200444

出　　处：《稀有金属与硬质合金》2017年第4期28-33,共6页Rare Metals and Cemented Carbides

摘　　要：利用非水基体系凝胶注模法制备了复杂形状钨铜复合材料坯体。研究了分散剂含量以及固相含量对钨铜浆料黏度的影响,绘制了坯体的室温干燥曲线并制订了干燥制度,同时对坯体微观形貌、抗弯强度等进行了表征和测试。结果表明:分散剂添加量为0.15%(质量分数,基于金属粉末质量)时浆料黏度达到最低,在此基础上浆料的固相含量可达到45%(体积分数),满足凝胶注模的要求;坯体先在室温下干燥10h后放入100℃的恒温干燥箱中干燥8h,可得到表面无变形、无开裂的钨铜坯体;随着固相含量的增大,坯体致密性和均匀性均随之提高;坯体表面质量较好,抗弯强度可达到26.9 MPa。W-Cu blanks with complex shape were prepared by non-aqueous gel-casting. The effect of disper- sant content and solid content on slurry viscosity was investigated. The blank drying curve was drawn and the drying system was established. Microstructure and bending strength of the blank were characterized. The results show that when the dosage of dispersant is 0.15%（ mass fraction and based on the quality of the metal powder）,slurry viscosity reaches the minimum and the slurry can obtain 45% （volume fraction） solid to meet the requirement of gel-casting. The blank is dried firstly at room temperature for 10 h and then placed in a constant temperature drying oven at 100℃ for 8 h to obtain W-Cu blank without deforma- tion and cracking on its surface. With the increase of solid content, both the density and uniformity of the blank increase. The blank has good surface quality and its bending strength can be up to 26.9 MPa.

关 键 词：钨铜复合材料 坯体 复杂形状 凝胶注模成形 浆料黏度 分散剂 

分 类 号：TB33[一般工业技术—材料科学与工程]