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本文采用粉末冶金方法制备了4组不同Ce O2含量的超细WC-9%Ni-Cr3C2硬质合金试样。利用Hot Disk热常数分析仪,采用瞬变平面热源法(TPS)技术测量了深冷处理前后材料的导热率;采用三点法测量了处理前后合金抗弯强度的变化情况。同时文章还利用XRD、SEM和EDX对合金烧结后的相成分组成与残余应力、微观结构和感兴趣区域进行了检测、观察和分析。结果表明:Ce O2的添加降低了合金的热导率和抗弯强度,增加了合金的残余应力;当Ce O2添加量为1.35wt.%时(4#合金),三者的变化分别为0.33%、17.17%和38.24%。深冷处理后,不同Ce O2含量的WC-9%Ni-Cr3C2热导率、抗弯强度提高幅度可达8.03%(1#合金)和7.23%(1#合金),但同时可在一定程度上降低合金的残余应力。
In this paper, four groups of ultrafine WC-9% Ni-Cr3C2 cemented carbide samples with different Ce O2 contents were prepared by powder metallurgy. The thermal conductivity of the material before and after cryogenic treatment was measured by the Hot Plane Thermal Analyzer (TGA). The three-point method was used to measure the flexural strength of the alloy before and after treatment. At the same time, the phase composition, residual stress, microstructure and region of interest of sintered alloy were also detected, observed and analyzed by XRD, SEM and EDX. The results show that the addition of Ce O2 decreases the thermal conductivity and flexural strength of the alloy, and increases the residual stress of the alloy. When the Ce O2 content is 1.35wt.% (4 # alloy), the changes of the three are 0.33 %, 17.17% and 38.24%. After cryogenic treatment, the thermal conductivity of WC-9% Ni-Cr3C2 with different content of Ce O2 can be improved by up to 8.03% (1 # alloy) and 7.23% (1 # alloy), but to a certain extent Reduce the residual stress of the alloy.