钴-抑制剂超细复合粉末的制备

Preparation of Ultrafine Co-Inhibitor Composite Powders

以氧化钴(Co3O4)、过渡金属氧化物(V2O5、Ta2O5、MoO3、TiO2)和碳粉(C)为原料,用真空直接还原碳化技术制备了应用于硬质合金的钴-抑制剂(Co-VC、Co-TaC、Co-Mo2C、Co-TiC)超细复合粉末。用XRD分析了不同反应温度和时间下生成物的相组成,用SEM观察了复合粉末的形貌。结果表明:直接还原碳化技术能使钴-抑制剂超细复合粉末在较低温度下合成,钴的添加能有效降低过渡金属氧化物的碳化温度。通过对比实验和热力学探讨了低温碳化的机理。

While the Co3O4, transition-metal oxides （V2O5, Ta2O5, MoO3 and TiO2） and carbon black was the raw materials, ultrafine Co-inhibitor composite powders （Co-VC, Co-TaC, Co-Mo2C and Co-TiC）, which can be applied in hardmetal industry, were synthesized via direct reduction ＆ carbonization process in vacuum. Phases of the resultants synthesized at different temperatures and in different dwell time were detected by XRD. The morphology of the composite powders was observed by SEM. Results show that ultrafine Co-inhibitor composite powders could be synthesized at low temperatures, which were effectively reduced by the participation of Co3O4. The mechanism of low-temperature carbonization was studied by comparative experiments and thermodynamic analysis.