改性SiC微粉复合粒子的制备与表征  

Preparation and characterization of modified SiC compound abrasive particles

作　　者：华勇[1] 李亚萍[1] 蒋登高[2] 武广才[1] 

机构地区：[1]河南工业大学,河南郑州450001 [2]郑州大学,河南郑州450001

出　　处：《金刚石与磨料磨具工程》2010年第3期10-13,18,共5页Diamond & Abrasives Engineering

基　　金：河南工业大学博士基金项目(150291)

摘　　要：针对SiC超细微粉在磨具制造过程中存在的易团聚、分散稳定性差、与结合剂相容性低等问题,本课题借助悬浮聚合工艺,采用聚丙烯酸对SiC微粉进行表面包覆改性,优化筛选出了羧甲基纤维素和CaCO3复合分散剂及其相关的较佳改性工艺条件。结果表明：反应温度65℃,反应时间30 min,搅拌速度500 r/min条件下,SiC弹性复合粒子的分散性和成球性最好;羧甲基纤维素浓度9%-11%、CaCO3用量0.5%~2%时,分散效果最好。制备出的有机物包覆的SiC微粉弹性复合粒子,显著改善了SiC超细微粉的分散流动性和其与有机结合剂的相容性。Aiming at the problems of easy reunion,poor dispersivity and bad compatibility with the bond of the ultrafine SiC powders existing in making resin bond polishing wheels,the authors designed a new technique of surface modification with polyacrylic acid（PAA） coating on SiC powder surfaces by means of co-polymerization process.The optimal complex dispersant system of carboxymethyl cellulose（CMC） and CaCO3 as well as optimal modifying process conditions were ascertained based on experiments.The results showed that,under reaction temperature 65 ℃ for 30 min at stirring speed 500 r/min,the best dispersivity and granulating ability of the coated SiC particles were obtained.With CMC concentration 9%~11% and CaCO3 0.5%~2%,the best dispersing effect was realized.The modified SiC compound particles have excellent dispersing and flowing performances,as well as high compatibility with organic bonds.

关 键 词：碳化硅微粉 表面改性 聚丙烯酸 碳化硅复合粒子 

分 类 号：TG73[金属学及工艺—刀具与模具]