分散剂和消泡剂对溶胶原位成型所制砂轮性能的影响  

Effect of Dispersant and Defoamer on the Properties of Grinding Wheel Produced by Sol-in-Situ

作　　者：万隆[1] 刘莹莹[1] 王俊沙[1] 李建伟 徐俊杰[1] 李颖颖[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2017年第12期8-13,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51375157)~~

摘　　要：以金刚石微粉和硅溶胶等为原料,采用溶胶-凝胶原位成型法来制备金刚石/陶瓷结合剂砂轮.研究了4种分散剂及3种消泡剂对金刚石/陶瓷结合剂混合浆料和砂轮性能的影响.结果表明:当萘系减水剂添加量(质量分数)为0.4%时,混合浆料粘度达最小值,分散性和流动性最佳;当有机硅DD消泡剂添加量为0.2%时,复合烧结体显微结构变均匀,气孔率最小,抗折强度最大;与无添加剂砂轮相比,添加分散剂和消泡剂的砂轮结构均匀致密,磨削后的硬质合金工件表面质量较好,无较深划痕,表面粗糙度为0.04μm.With micro diamond powder and silica sol as raw materials, the diamond and vitrified grinding wheel were prepared by sol-gel in-situ method.The effect of dispersant and defoamer on the prop- erties of mixed slurry and abrasives was studied.The results show that with 0.4% naphthalene based super plasticizer added, the dispersity and the fluidity of mixed slurry are good,and the viscosity reaches the min- imum value.When the addition of silicone defoamer DD is 0.2G, the microstructure of the composite sin- tered body is uniform with the minimum porosity and the maximum bend strength. Compared with the grinding wheel without additives, the mierostructure of grinding wheel with dispersant and defoamer is dense and uniform.The surface quality of cemented carbide grinded by the new designed wheel is better.No deep scratches were observed,and the surface roughness was 0.04 μm.

关 键 词：溶胶-凝胶 金刚石 分散剂 消泡剂 

分 类 号：TG74[金属学及工艺—刀具与模具] TB332[一般工业技术—材料科学与工程]