首页|微量Y2O3对WC-6Co非均匀结构硬质合金微观结构及性能的影响

微量Y2O3对WC-6Co非均匀结构硬质合金微观结构及性能的影响

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  • 国家科技期刊平台
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采用低压烧结法制备了不同Y2O3 添加量(质量分数)的WC-6Co非均匀硬质合金，并通过扫描电子显微镜、X射线衍射仪、能谱仪、金相显微镜、电子万能力学试验机、硬度计、矫顽磁力仪等设备研究了Y2O3 质量分数对WC-6Co非均匀硬质合金微观结构、相成分及性能的影响。结果表明:Y2O3 不会对合金相对密度和相组成产生影响;Y2O3 与合金中杂质元素硫、氧等形成稳定的化合物，弥散分散于WC晶界，阻碍WC晶粒的融合长大，降低WC晶粒粒度，抑制WC晶粒非均匀结构的均匀化。随着Y2O3 添加量的增加，合金的硬度逐渐增加，而抗弯强度呈现出先迅速上升后下降的趋势。Y2O3 质量分数为 0。048%对WC-6Co非均匀硬质合金性能提升最明显，硬度和抗弯强度分别达到1530 kgf·mm-2 和2902 MPa。
Effect of trace Y2O3 on microstructure and properties of WC-6Co cemented carbides with inhomogeneous structure
Inhomogeneous structure WC-6Co cemented carbides with the different Y2O3 additions(mass fraction)were prepared by low pressure sintering.The microstructure and properties of the cemented carbides were investigated by scanning electron microscope(SEM),X-ray diffraction analyzer(XRD),energy dispersive spectrometer(EDS),metallographic microscope,electronic universal mechanical test machine,hardness meter,and coercivity magnetometer.The results show that,the relative density and phase composition of the cemented carbides are not affected by Y2O3 addition.Y2O3 forms a stable solid solution with the impurity elements such as sulfur and oxygen,which disperses in the WC grain boundary,hinders the fusion and growth of WC grains,reduces the size of WC grains,and inhibits the homogenization of WC grains in inhomogeneous structure.With the increase of Y2O3 mass fraction,the hardness of the cemented carbides increases gradually,and the bending strength shows a trend of rapid rise and then decline.The optimum properties of the cemented carbides are obtained when the Y2O3 mass fraction is 0.048%,the hardness and bending strength are 1530 kgf·mm-2 and 2902 MPa,respectively.

Y2O3WC-6Cocemented carbidesmicrostructuremechanical properties

唐彦渊、羊求民、徐国钻、王红云、钟志强

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崇义章源钨业股份有限公司,赣州 341300

江西理工大学材料冶金化学学部,赣州 341000

Y2O3 WC-6Co 硬质合金 微观结构 力学性能

江西省重点研发计划资助项目江西省教育厅科学技术研究项目面上项目江西省主要学术和技术带头人培育计划青年人才项目赣州市2020科技重大专项赣州市2020青年人才计划项目赣州市重点研发计划一般项目

20203BBE53052GJJ20080720212BCJ23005202101124490

2024

10.19591/j.cnki.cn11-1974/tf.2021120008

粉末冶金技术
中国机械工程学会,中国金属学会,中国有色金属学会,北京科技大学

粉末冶金技术

CSTPCD北大核心
影响因子：0.341
ISSN：1001-3784
年,卷(期)：2024.42(2)
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