Mo/Al2O3复合材料的制备及性能研究

Study on Preparation and properties of Mo/Al2O3 composites

针对氧化铝陶瓷和金属钼的特点,为解决氧化铝陶瓷低温脆性大、金属钼高温易氧化和蠕变等问题,通过溶胶凝胶法制备金属陶瓷颗粒,采用放电等离子烧结(SPS)制备了配比不同的Mo/Al2O3金属陶瓷复合材料,探究了Mo颗粒含量对Mo/Al2O3金属陶瓷性能的影响。结果表明:在1400℃下进行真空放电等离子烧结可得到Mo/Al2O3金属陶瓷,且在vol.%Mo=x(x=15,20,25)范围内、组分配比相同的情况下,添加20%Mo可制得综合性能较好的Mo/Al2O3金属陶瓷,其密度为5.2g/cm^3、硬度(HV0.5)为12.7、断裂韧性4.24MPa·m^1/2。

To solve the low temperature brittleness of alumina ceramics and the high temperature oxidation and creep of molybdenum metals,ceramic particles were prepared by sol-gel method according to the characteristics of alumina ceramics and molybdenum metal.Mo/Al2O3 ceramic composites with different particle sizes and composition were prepared by spark plasma sintering(SPS),and the effects of Mo particle size and content on Mo/Al2O3 cermet properties were investigated.The results shewed that Mo/Al2O3 cermet performance samples were obtained by vacuum discharge plasma at the 1400℃sintering temperature,and the comprehensive performance of cermet prepared by adding 20%Mo was better among the ones prepared in the range of vol.%Mo=x(x=15,20,25)at the same composition ratio,as its density was 5.2 g/cm^3,hardness(HV0.5)12.7,and the fracture toughness 4.24 MPa·m^1/2.