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以WC-16%Co(质量分数)废旧硬质合金块体为原料,采用氧化-原位还原碳化的方法对其进行回收制备再生WC-16%Co复合粉,并对再生复合粉进行低压烧结制备再生硬质合金块体材料.通过热力学计算确定氧化物粉末和炭黑发生原位还原碳化反应的温度范围,采用实验方法系统研究了原料粉末中配C量对再生复合粉和再生硬质合金的物相组成、力学性能等的影响,并对再生合金的显微组织与性能的关系进行了分析.结果表明:随着原料粉中配C量的增加,再生复合粉中的Co6W6C相逐渐减少,总C和游离C含量增加;当配C量为16.60%时,可制备出化学成分符合原生WC-16%Co复合粉要求的再生复合粉,经低压烧结可得到物相纯净,断裂韧性达到23.05 MPa·m1/2,横向断裂强度达到4020 MPa的高性能再生硬质合金;再生硬质合金的Co相分布是否均匀,对再生硬质合金的综合性能优良与否起到至关重要的作用.
The WC-16% Co (mass fraction) waste cemented carbide block was used as a raw material, and the regenerated WC-16% Co composite powder was recovered by oxidation-in situ reduction carbonization method, and the low pressure sintering Preparation of regenerated cemented carbide block material through the thermodynamic calculation to determine the oxide powder and carbon black in situ reduction carbonation reaction temperature range, the experimental method was used to systematically study the raw material powder with C content of recycled composite powder and regenerated hard alloy The phase composition and the mechanical properties of the regenerated alloy were investigated.The results showed that the Co6W6C phase in the regenerated composite powder gradually decreased with the increase of the amount of C in the raw material powder , The content of total C and free C increased. When the amount of C was 16.60%, the regenerated composite powder with the chemical composition conforming to the requirement of primary WC-16% Co composite powder could be prepared, and the phase was pure and the fracture toughness was achieved by low pressure sintering 23.05 MPa · m1 / 2 and transverse rupture strength of 4020 MPa. Whether the distribution of Co phase in regenerated cemented carbide is even and plays an important role in the excellent performance of regenerated cemented carbide .