热压烧结制备可磨耗封严Al2024/hBN复合材料及其性能

Fabrication and properties of abradable sealing Al2024/hBN composites by hot-pressing sintering

采用热压烧结技术制备可磨耗封严Al2024/hBN复合材料,研究了球磨时间对复合材料微观组织和力学性能的影响。结果表明,通过热压烧结技术制备的Al2024/hBN复合材料具有较高的密度和硬度,分别达到2.52g·cm^(-3)和HR15Y 90以上。随着球磨时间的增加,热压烧结样品微观组织发生显著变化,由颗粒状变为层片组织结构;摩擦系数和体积磨损量降低,最低达到0.32和2.3×10^(-3)mm^(3)·m^(-1)·N^(-1),三点弯曲力由1.2 kN提高到2.3 kN。

The abradable sealing Al2024/hBN composites were produced by hot-pressing sintering.The influence of ball milling time on the microstructure and mechanical properties was investigated.The results show that,the Al2024/hBN composites sintered by hot-pressing sintering have a relatively higher density and hardness,up to 2.52 g/cm^(3) and HR15Y 90,respectively.With the extension of ball milling time,the microstructure of the composites significantly changes from the spherical particle to the lamellar structure,the friction coefficient and volume wear rate reduce,reaching the minimum of 0.32 and 2.3×10^(-3)mm^(3)·m^(-1)·N^(-1),respectively.The maximum bending force increases with the ball milling time,from 1.2 kN to 2.3 kN in the three-point bending test at room temperature.