以碳酸钴为原料,采用氢气还原法在带式无舟皿连续还原炉中制备超细球形钴粉.考察还原温度和还原时间对钴粉粒度的影响.结果表明,在420~460 ℃还原180 min左右,可以制备费氏粒度为0.9 μm左右的超细球形钴粉.采用二氧化碳气体钝化处理技术降低了钴粉的氧含量.采用制备的钴粉为超细晶粒硬质合金的粘结剂,用低压烧结工艺制备出钴相高度分散、晶粒均匀的超细晶粒YG10硬质合金.其晶粒度为0.4 μm,矫顽磁力达38.0 kA/m,硬度大于93.0 HRA,抗弯强度高于3 700 MPa.
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