摘要
以立方氮化硼(CBN)、碳化钨和钴粉为实验原料,将其高温真空处理后,在六面顶压机上通过高温超高压烧结合成了不同WC-Co含量的PCBN复合材料,并对其物相、致密性、硬度、磨耗比、抗冲击韧性以及微观形貌进行分析。结果表明,在实验范围内,当WC-Co含量为11%时,CBN与结合剂之间结合力较弱,PCBN复合材料内部结构相对疏松,气孔率最高,磨耗比和显微硬度达到最大,分别为7 200和35.6 GPa;当WC-Co含量为20%时,PCBN复合材料表面气孔明显减少,内部结构紧密,气孔率最低,致密度明显提高,抗弯强度和抗冲击次数达到最大,分别为750 MPa和80次,相比WC-Co含量为11%的PCBN复合材料分别提高了22%和45%。
Using cubic boron nitride(CBN),tungsten carbide and cobalt powder as experimental raw mate-rials, after high temperature vacuum treatment, PCBN composites with different WC-Co contents were synthesized by high temperature and ultra-high pressure sintering on a six-sided top press.The phase, compactness, hardness, abrasion ratio, impact toughness and micro morphology of the PCBN composites were analyzed.The results show that in the experimental range, when the WC-Co content is 11%,the bonding force between CBN and the binder is weak, the internal structure of the PCBN composite is relatively loose, the porosity of the sample is the highest, and the wear ratio and microhardness reach the maximum, 7 200 and 35.6 GPa, respectively.When the WC-Co content is 20%,the porosity on the surface of the PCBN composite is significantly reduced, the internal structure is compact, the porosity is the lowest, the density is significantly improved, and the flexural strength and impact times reach the maximum, 750 MPa and 80 times, which are 22% and 45% higher than those of the PCBN composite with 11% WC-Co content, respectively.
作者
徐敏
江文清
XU Min;JIANG Wen-qing(Electrical Engineering Institute,Jiujiang Vocational and Technical College,Jiujiang 332000,China;Automotive Engineering Institute,Jiujiang Vocational and Technical College,Jiujiang 332000,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2022年第2期91-95,共5页
Rare Metals and Cemented Carbides
