电铸制备TiB2/Cu复合材料的性能

Properties of Electroforming TiB2/Cu Composites

摘要:

使用粒度约为3 μm的导电陶瓷TiB2颗粒作为铜基复合材料的增强相，在酸性硫酸铜溶液中用电铸方法制备TiB2/Cu电火花加工用工具电极。用扫描电镜和金相显微镜观察其组织结构，用维氏硬度计测量硬度，用中性盐雾试验测量其耐腐蚀性，用电火花加工脆硬材料衡量其抗电蚀性。结果表明：电铸Cu与TiB2/Cu晶粒平均直径分别为30，10 μm，硬度分别为984，1235 MPa，腐蚀失重分别为47.8，40.3 mg；TiB2颗粒的加入可显著细化晶粒，提高硬度、耐腐蚀性和抗电蚀性。

Abstract:

Cu-based TiB2/Cu electrodes reinforced by conductive ceramic TiB2 particles with a particle size of about 3 mm were prepared by electroforming in acid H2SO4 solution. Their structure was observed by scanning electron microscopy and metallographic microscope, hardness was measured by Vickers hardness tester, the corrosion resistance was measured by salt spray tests, and the electric erosion resistance was evaluated by brittle-hard materials. The results show that the reinforcing TiB2 particles are uniformly distributed in the matrix. The particle size of the electroformed Cu and TiB2/Cu is 30 and 10 mm, the hardness is 984 and 1235 MPa, and the corrosion is 47.8 and 40.3 mg, respectively. Compared with Cu electricity deposit, TiB2/Cu composites have preferable surface, small grains and higher hardness, and this kind of composite material as an EDM tool electrode material show good corrosion resistance and electrical erosion resistance.