MoAlB has promising aeronautic and high-temperature applications due to its excellent mechanical property, favorable thermal conductivity and fantastic high temperature oxidation resistance etc. In this work, in order to obtain MoAlB with preferable properties, the fine-grained MoAlB ceramics were prepared by proprietary mechanical alloying and hot-pressing sintering technology. The microstructure observation showed that MoAlB with a small grain size of 1.26 μm could be obtained when the molar ratio of Mo, Al and B was 1:1.3:1 and the sintering temperature was 1300 °C. The testing results indicated that the as-prepared MoAlB ceramic showed better comprehensive mechanical properties compared with the reported results. The compressive strength, hardness, flexural strength and fracture toughness are 2420 MPa, 15.46 GPa, 382.87 MPa and 7.1 MPa·m^1/2, respectively. It also exhibited favorable high temperature oxidation resistance due to the rapid formation of alumina scales. These results can cast light for future development of ultrahigh-temperature ceramics.

MoAlB由于其优异的机械性能，良好的导热性和出色的高温抗氧化性等优点，在航空和高温应用中具有广阔的前景。在这项工作中，为了获得性能更好的MoAlB，通过专有的方法制备了细晶粒的MoAlB陶瓷。机械合金化和热压烧结技术。显微组织观察表明，当Mo，Al和B的摩尔比为1：1.3：1且烧结温度为1300°C时，可以获得1.26μm小晶粒尺寸的MoAlB。测试结果表明，所制备的MoAlB陶瓷与报道的结果相比具有更好的综合机械性能。压缩强度，硬度，弯曲强度和断裂韧性为2420MPa，15.46GPa，382.87MPa和7.1MPa·m。^1/2。由于氧化铝水垢的快速形成，它还表现出有利的高温抗氧化性。这些结果可以为超高温陶瓷的未来发展提供参考。