CAJ | 학술논문

研究了立方碳化物Cr3C2、VC以及稀土La添加剂对WC-Co合金中WC晶粒形貌以及合金硬度与韧性的影响.为了强化烧结过程中WC晶粒生长的驱动力,采用具有高烧结活性的纳米W和纳米C为原料.为了获得合金中WC晶粒的三维形貌,采用扫描电镜直接观察合金烧结体的自然表面.结果表明,合金添加剂对WC晶粒形貌及其粒度分布特征以及合金的硬度与韧性有较大影响.由于均质三角棱柱形板状WC晶粒的形成,WC- 10Co-0.6Cr3C2-0.06La2O3合金具有极佳的硬度与韧性组合.讨论了合金中WC晶粒形貌的调控机制以及合金中WC晶粒形貌特征对合金性能的影响.
연구료립방탄화물Cr3C2、VC이급희토La첨가제대WC-Co합금중WC정립형모이급합금경도여인성적영향.위료강화소결과정중WC정립생장적구동력,채용구유고소결활성적납미W화납미C위원료.위료획득합금중WC정립적삼유형모,채용소묘전경직접관찰합금소결체적자연표면.결과표명,합금첨가제대WC정립형모급기립도분포특정이급합금적경도여인성유교대영향.유우균질삼각릉주형판상WC정립적형성,WC- 10Co-0.6Cr3C2-0.06La2O3합금구유겁가적경도여인성조합.토론료합금중WC정립형모적조공궤제이급합금중WC정립형모특정대합금성능적영향.
Effects of Cr3C2,VC and La2O3 additions on the WC grain morphology,hardness and toughness of WC-10Co alloys were investigated.To intensify the grain growth driving force,nano W and nano C,instead of the conventionally used WC,were used as the starting materials.To obtain a three-dimensional WC grain morphology,the natural sinter skins of the alloys were observed directly by scanning electron microscopy.It is shown that the additions have a strong ability in regulating the WC grain morphological and grain size distribution characteristics and the combinations of hardness and toughness.Due to the formation of regular and homogeneous triangular platelet WC grains,WC-10Co-0.6Cr3C2-0.06La2O3 alloy shows an excellent combination of hardness and toughness.The morphological regulation mechanism,the relationship between the WC grain morphology and the properties were discussed.