高温高压制备WC-3%Co硬质合金及其物理力学性能表征  

Preparation of WC-3%Co Cemented Carbide at High Temperature and High Pressure and Characterization of its Physical and Mechanical Properties

作　　者：吴彦红 吴同敬 李虎 吴佳益 Wu Yanhong;Wu Tongjing;Li Hu;Wu Jiayi(Zhengzhou Product Quality Inspection and Testing Center,Zhengzhou Henan 450006,China;Henan Defective Product Recall Center,Zhengzhou Henan 450006,China;Henan Institute of Metrology,Zhengzhou Henan 450008,China)

机构地区：[1]郑州市产品质量检验检测中心,河南郑州450006 [2]河南省缺陷产品召回中心,河南郑州450006 [3]河南省计量测试科学研究院,河南郑州450008

出　　处：《硬质合金》2024年第3期213-219,共7页Cemented Carbides

摘　　要：高温高压法是合成宝石的有效方法,应用于复合材料的制备,具有超高等静压力和合成时间短这两大优势。本文采用高温高压法制备WC-3%Co硬质合金,利用万能试验机、X射线衍射仪(XRD)、显微硬度计等对试样进行物相组成和力学性能表征。研究了烧结温度对WC-3%Co硬质合金物相和物理力学性能的影响。结果表明:通过高温高压烧结可以确保所制备的硬质合金样品为较为纯净的WC相和Co相;样品的相对密度随着温度的升高而升高,在1450℃时相对密度可以达到99.3%;随烧结温度的升高,样品的硬度、抗弯强度和断裂韧性均呈现先升高后降低的趋势。当烧结温度为1400℃时,制备的WC-Co硬质合金样品具有优异的力学性能,抗弯强度2230 MPa、硬度22.78 GPa、断裂韧性11.9 MPa·m^(1/2)。High temperature and high pressure method,an effective method for synthesizing gems,has the advantages of ultra-high isostatic pressure and short synthesis time in the preparation of composite materials.In this paper,WC-3%Co cemented carbide was prepared at high temperature and high pressure,and the phase composition and mechanical properties of the cemented carbide samples were characterized by using tools including a universal testing machine,an Xray diffractometer(XRD),and a microhardness tester.The effects of sintering temperature on the phase and physical and mechanical properties of WC-3%Co cemented carbide were investigated.The results show that sintering at high temperature and high pressure can ensure that the prepared cemented carbide samples are pure WC and Co phases;the relative densityof the samples increases with the increase of temperature and can reach 99.3% at 1 450 ℃;the hardness, bending strengthand fracture toughness of the samples increase firstly and then decrease with the increase in sintering temperature. WC-Cocemented carbide samples prepared at 1 400 ℃ have excellent mechanical properties, of which bending strength reaches2 230 MPa, hardness reaches 22.78 GPa and fracture toughness reaches 11.9 MPa·m^(1/2).

关 键 词：高温高压 烧结温度 WC-CO 硬质合金 物理力学性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]