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采用先进粉末冶金工艺制备了两种碳含量不同的WC-6.5%Co超细硬质合金,研究了超细硬质合金中碳含量的变化对合金显微组织、基本物理力学性能及铣削性能的影响规律。结果表明,在相同的烧结制度条件下,高碳合金比低碳合金的平均晶粒尺寸大,尺寸分布不均匀性增加,合金的弯曲强度和硬度下降。直径为Ф1.0 mm和Ф1.4 mm微铣刀的铣削试验结果表明,合金中碳含量的增加,降低了合金的平均铣削寿命。
Two kinds of WC-6.5% Co ultrafine cemented carbide with different carbon contents were prepared by advanced powder metallurgy. The effects of carbon content in ultrafine cemented carbide on the microstructure, basic physical and mechanical properties and milling performance of the alloy Affect the law. The results show that under the same sintering conditions, the average grain size of the high-carbon alloy is larger than that of the low-carbon alloy, the size distribution is increased, and the bending strength and hardness of the alloy are decreased. Milling tests on Ф1.0 mm and Ф1.4 mm micro-mills show that an increase in carbon content in the alloy reduces the average milling life of the alloy.