cBN@TiN/β-Sialon复合陶瓷及刀具的制备与性能  

Preparation and Properties of cBN@TiN/β-Sialon Composite Ceramic and Cutting Tool

作　　者：黄坤恒 罗展鹏 罗嗣春 郭伟明[1] 林华泰 HUANG Kunheng;LUO Zhanpeng;LUO Sichun;GUO Weiming;LIN Huatai(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Mechanical and Electronic Engineering,Pingxiang University,Pingxiang 337055,China)

机构地区：[1]广东工业大学机电工程学院,广州510006 [2]萍乡学院机械电子工程学院,萍乡337055

出　　处：《机械工程材料》2024年第6期33-38,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(52172066)。

摘　　要：采用放电等离子烧结技术,通过原位生成TiN包覆cBN(cBN@TiN)颗粒制备了cBN@TiN/β-Sialon复合陶瓷,研究了其物相组成、微观形貌、力学性能以及制成的可转位刀具连续干式切削球墨铸铁时的切削性能,并与β-Sialon陶瓷及刀具进行对比分析。结果表明:cBN@TiN/β-Sialon复合陶瓷由β-Sialon、cBN和TiN相组成,其抛光态表面无明显气孔,cBN@TiN颗粒均匀分布,未发生明显脱落,基体相晶粒呈等轴状和长棒状;cBN@TiN/β-Sialon复合陶瓷的相对密度和晶粒尺寸与β-Sialon陶瓷相近,硬度和断裂韧性分别为(17.40±0.11)GPa和(6.19±0.10)MPa·m^(1/2),高于β-Sialon陶瓷;与β-Sialon陶瓷刀具相比,cBN@TiN/β-Sialon复合陶瓷刀具的耐磨性更好,切削寿命更长。cBN@TiN/β-Sialon composite ceramic were prepared by in-situ generation of TiN coated cBN(cBN@TiN)particles by discharge plasma sintering technique.The phase composition,micromorphology and mechanical properties of the ceramic were studied.The cutting properties of indexable tool maded by the composite ceramic in continuous dry cutting ductile iron were also studied.The microstructure and propertres of the composite ceramic and cutting tool were compared with those ofβ-Sialon ceramic and cutting tool.The results show that the cBN@TiN/β-Sialon composite ceramic was composed ofβ-Sialon,cBN and TiN phases.There were no obvious pores on the polished surface of the ceramic,cBN@TiN particles were evenly distributed and did not fall off obviously.The matrix phase grains were equiaxial and long rod-like.The relative density and grain size of cBN@TiN/β-Sialon composite ceramic were similar to those of theβ-Sialon ceramic.The hardness and fracture toughness of the composite ceramic were(17.40±0.11)GPa and(6.19±0.10)MPa·m^(1/2),respectively,which were higher than those of theβ-Sialon ceramic.Compared with the β-Sialon ceramic cutting tool,the cBN@TiN/β-Sialon composite ceramic cutting tool had better wear resistance and a longer cutting life.

关 键 词：SIALON陶瓷 CBN 力学性能 切削性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]