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通过金相、硬度、密度和抗弯强度测定,对添加稀土的Ti C基钢结硬质合金进行显微组织、力学性能分析。结果表明:在一定的范围内,随着稀土氧化物La2O3含量的增加,Ti C基钢结硬质合金密度、硬度和抗弯强度均提高。当稀土氧化物La2O3加入量为0.48%时所获得的Ti C基钢结硬质合金显微组织均匀,硬度值达到HRC68.5。La2O3能够与金属粉末界面上的杂质和氧化膜作用,有助于润湿性的改善,从而有利于致密化的进程,减小孔隙度,提高抗弯强度。
The microstructure and mechanical properties of rare earth-added TiC-based cemented carbide were analyzed by metallography, hardness, density and flexural strength. The results show that the density, hardness and flexural strength of TiC-based steel bonded carbide increase with the increase of La2O3 content in a certain range. When the amount of rare earth oxide La2O3 added is 0.48%, the microstructure of TiC-based steel bonded carbide is uniform and the hardness reaches HRC68.5. La2O3 acts as an impurity and oxide film at the metal powder interface, contributing to the improvement of wettability, thereby facilitating the densification process, reducing the porosity and increasing the flexural strength.