原料配方对氧化铝/铝金属陶瓷材料性能的影响

Effect of Raw Material Formulation on the Properties of Al2O3-Al Cermet Materials

金属陶瓷既保持了陶瓷材料的特性,又具备金属材料优势,因此应用非常广泛。利用粉末冶金方法制备氧化铝/铝金属陶瓷材料,研究原料配方对氧化铝/铝金属陶瓷材料性能的影响,为研制得到耐磨性能好、导热系数高的金属陶瓷材料提供参考。结果表明,氧化铝与铝的质量比为1∶3时,所制备的金属陶瓷的性能最好,致密度最高,铝与氧化铝分布均匀。加入MgO的助烧效果相对于SiO2和Y2O3要好,且致密化程度较高,其试样硬度和强度比添加了SiO2和Y2O3的试样要高。采用沉淀法制取复合粉体制备金属陶瓷比球磨法制取复合粉体制备的金属陶瓷性能优异,致密度和表面硬度较高,其致密度为97.1%,表面硬度为875 HV,电阻率为0.0169Ω·m。

Cermet not only retains the characteristics of ceramic materials, but also has the advantages of metal materials, so the application is very extensive. In this paper, alumina/aluminum cermet materials were prepared by powder metallurgy method. The influence of raw material formula on the properties of alumina/aluminum cermet was studied. The reference was made to the ceramic materials with good wear resistance and high thermal conductivity. The results show that when the mass ratio of alumina to aluminum is 1∶3, the properties of the prepared cermets are the best, the density is the highest, and the distribution of aluminum and alumina is uniform. The effect of adding MgO is better than that of SiO2 and Y2O3, and the degree of densification is higher, and the hardness and strength of the sample are higher than those of SiO2 and Y2O3. The properties of sintered cermets using the composite powder prepared via the precipitation method are higer than that of sintered cermets using the composite powder prepared via the ball mill method, and the densities and surface hardness were high, the density was 97.1%, the surface hardness was 875 HV and the electric resistance was 0.0169 Ω·m.