超细晶WC-Co硬质合金制备工艺研究

Study on the preparation technology of ultrafine WC Co cemented carbide

以超细WC粉、Co粉为主要原料,采用低压烧结法制备超细晶WC-12Co硬质合金,研究球磨时间对超细晶硬质合金组织性能的影响。研究结果表明,随着球磨时间的延长,硬质合金密度变化不大,钴磁呈降低趋势,磁力、硬度与抗弯强度呈升高趋势,显微组织结构均表现为致密、均匀。球磨64h后的硬质合金硬度为1730 HV3,抗弯强度为5137 MPa。

Ultrafine WC-12Co cemented carbide was prepared by low pressure sintering with ultrafine WC powder and Co powder as main raw materials.The effect of milling time on the microstructure and properties of ultrafine WC-12Co cemented carbide was studied.The results show that with the increase of milling time,the density of cemented carbide changes little,the cobalt magnetism decreases,the magnetic force,hardness and bending strength increase,and the microstructure is compact and uniform.After ball milling for 64H,the hardness of cemented carbide is 1730 HV3,and the bending strength is 5137 MPa.