结合剂分散性对陶瓷结合剂cBN固结磨具微观结构和性能的影响  

Effect of Vitrified Bond Dispersion on Microstructure and Properties of Vitrified Bond cBN Grinding Tools

作　　者：刘小磐[1] 贺洛霆 鄢永高[2] 潘晓毅 陈帅鹏 岳嵩 LIU Xiaopan;HE Luoting;YAN Yonggao;PAN Xiaoyi;CHEN Shuaipeng;YUE Song(College of Materials Science and Engineering,Hunan University,Changsha 410082,China;State Key Laboratory of New Material Composite Technology,Wuhan University of Science and Technology,Wuhan 430000,China;China Nonferrous Guilin Mineral and Geological Research Institute Co.,Ltd.,Guilin 541000,China;College of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430000 [3]中国有色桂林地质矿产研究院有限公司,广西桂林541000 [4]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《湖南大学学报（自然科学版）》2023年第12期112-121,共10页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(751229124);广西重点研发计划项目(AB20159010)。

摘　　要：本文探究了硅烷偶联剂KH560的浓度对陶瓷结合剂粉体分散性和放置稳定性的影响,并探究了改性机理.进而以不同分散性的结合剂粉体制备了cBN磨具,探究了结合剂粉体改性方式和放置时间对磨具微观机理、力学性能和磨削性能的影响.结果表明:以质量分数为3.0%的KH560作为添加量时,改性后的陶瓷结合剂微粉的分散性和放置稳定性最好.采用质量分数为3.0%KH560改性的陶瓷结合剂微粉放置360 h后,其所制备的cBN磨具样品微观结构均匀,抗弯强度与洛氏硬度均达到最大值,分别为189.3 MPa和100.15 HRB,相较于未改性的cBN磨具其相应数值分别增加了14.54%和5.82%;用该结合剂制备的cBN磨具珩磨轴承钢内孔时,被加工工件的表面粗糙度Ra为0.054μm,相较于未改性的cBN磨具所加工的工件其数值下降了48.6%.The effect of the concentration of silane coupling agent KH560 on the dispersion and placement stability of the vitrified bond was investigated,together with the mechanism of modification.Furthermore,cBN grinding tools were prepared with vitrified bond of different dispersion,and the influence of modification methods of vitrified bond and storage time on the micro-mechanism,mechanical properties and grinding performance of cBN grinding tools were studied.The results show that when the KH560 addition was 3.0%,the vitrified bond powder displayed the best dispersion and placement stabilization.The microstructure of CBN abrasive tools prepared by using 3.0%KH560 modified vitrified bond powder for 360 h was uniform,and the bending strength and Rockwell hardness reached the maximum values of 189.3 MPa and 100.15 HRB,which were 12.72%and 5.82%higher than those of unmodified cBN grinding tools respectively.The surface roughness value of the workpiece was 0.054μm when using this grinding tool to honed the inner holed of bearing steel,which was 48.6%lower than that of the workpiece processed by unmodified cBN grinding tools.

关 键 词：陶瓷结合剂 表面改性 CBN磨料 力学性能 磨削性能 

分 类 号：TG74[金属学及工艺—刀具与模具]