温度对汽车零部件切削加工用PCBN复合材料结构与性能的影响研究  

Effect of Temperature on Structure and Performance of PCBN Composites for Automotive Parts Machining

作　　者：杨桂娟[1] 杨胜才 王冠群 YANG Guijuan;YANG Shengcai;WANG Guanqun(College of Automation Engineering,Tangshan Polytechnic College,Tangshan 063000,Hebei,China;College of Materials Science and Engineering,Fuzhou University,Fuzhou 350116,Fujian,China;Fujian Key Laboratory of Preparation and Forming Technology for Advanced Materials,Fuzhou 350118,Fujian,China)

机构地区：[1]唐山工业职业技术学院自动化工程学院,河北唐山063000 [2]福州大学材料科学与工程学院,福建福州350116 [3]福建省新材料制备与成形技术重点实验室,福建福州350118

出　　处：《矿冶工程》2023年第2期145-148,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51871057)。

摘　　要：以TiN作为主要结合剂,加入一定量的Al粉和Ti粉,研究了烧结温度(1300~1600℃)对TiN⁃Al⁃Ti结合立方氮化硼(CBN)烧结合成聚晶立方氮化硼(PCBN)复合材料的组成、显微结构以及力学性能的影响。结果表明,PCBN试样的物相主要为BN、TiB_(2)、TiN、AlN,烧结过程中Ti与CBN反应生成TiN和TiB_(2)相;PCBN的相对密度、抗弯强度以及硬度随着烧结温度升高总体上呈上升趋势。1500℃烧结时,可以得到综合性能好的复合材料,其相对密度、抗弯强度、断裂韧性和显微硬度分别为99.1%、807.8 MPa、6.2 MPa·m^(1/2)和3233HV。Polycrystalline Cubic boron nitride(PCBN)composites were synthesized by adding a certain amount of Al and Ti,with TiN as the main binder.The effects of temperature(1300-1600℃)on the composition,microstructure and mechanical properties of the PCBN composites sintered with TiN⁃Al⁃Ti in combination with CBN were investigated.It is found that the phases of PCBN specimen are mainly composed of BN,TiB_(2),TiN and AlN,and almost all Ti reacts with CBN in the sintering process to form TiN and TiB_(2) phases.The relative density,flexural strength and hardness of PCBN are generally trending up with the rising of sintering temperature.And composite material with good comprehensive performance can be obtained at a sintering temperature of 1500℃,showing its relative density of 99.1%,flexural strength of 807.8 MPa,fracture toughness of 6.2 MPa·m^(1/2),and micro⁃hardness of 3233HV.

关 键 词：超硬材料 立方氮化硼 聚晶立方氮化硼 烧结 结合剂 TiN BN TiB_(2) 切削 

分 类 号：TG74[金属学及工艺—刀具与模具]