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
吴彦红 1吴同敬 2李虎 1吴佳益3
作者信息
- 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
- 折叠
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1 450℃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 1 400℃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2 230 MPa、硬度22.78 GPa、断裂韧性11.9 MPa·m1/2.
Abstract
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 X-ray 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 density of the samples increases with the increase of temperature and can reach 99.3％at 1 450℃;the hardness,bending strength and fracture toughness of the samples increase firstly and then decrease with the increase in sintering temperature.WC-Co cemented carbide samples prepared at 1 400 ℃ have excellent mechanical properties,of which bending strength reaches 2 230 MPa,hardness reaches 22.78 GPa and fracture toughness reaches 11.9 MPa·m1/2.
关键词
高温高压/烧结温度/WC-Co/硬质合金/物理力学性能Key words
high temperature and high pressure/sintering temperature/WC-Co/cemented carbide/physical and mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据