Cu-Fe基金刚石复合材料的制备工艺及性能

采用真空热压烧结工艺制备了Cu-Fe基粉末金刚石复合材料磨头,通过金相、XRD及硬度测试等实验方法,研究了不同烧结温度下制得的合金材料的显微组织特性和性能。结果表明,在实验条件下,烧结体中各元素之间产生了冶金结合,且合金化程度随着温度的升高而增大;930℃时,烧结体中金刚石与基体结合性较好,金刚石无石墨化现象,烧结体的硬度最高,达到160HB。     

Effects of cerium on microstructure and bonding strength of Cu-14Al-4.5Fe bronze plasma sprayed coating

Cu-14Al-4.5Fe bronze powders with and without 0.6% Ce were prepared and their coatings were fabricated on 45# carbon steel substrate by atmospheric plasma spraying. The effects of rare earth Ce on the coating interface bonding strength, coatings and bonding interface vertical sections microstructure were investigated by tensile machine, X-ray diffraction analysis, scanning electron microscopy (SEM) and electronic probe microanalysis (EPMA). The results showed that the shape of powders was more spherical like, and the coating’s hardness and interface bonging tensile strength would be improved to 8.9% and 17.4%, respectively, higher than that of the Cu-14Al-4.5Fe coating without 0.6% Ce added. The refined of κ phases, well distributed matrix phases in coatings and the promotion of Fe, Al elements diffusion led to the improvement in interface bonding strength and hardness of the Cu-14Al-4.5Fe coating with addition of 0.6% Ce, which hardened and strengthened the coating.     

Cu-Fe基粉末烧结金刚石复合材料界面结合特性

以Cu-Fe基粉末为基体材料,在真空压力烧结条件下制备了金刚石复合材料。利用扫描电镜、能谱仪、X射线衍射仪等研究粉末与金刚石颗粒界面结合特性。结果表明,930℃、15MPa烧结温度和压力下,烧结胎体中Fe原子向金刚石表面扩散,形成一定厚度的扩散层,并与金刚石中的C发生化学反应生成Cfe15,呈非连续层片状分布于金刚石颗粒表面,实现了金刚石颗粒与金属的化学键结合。