B_4C/TiB_2/Mo喷嘴冲蚀性能及其冲蚀机理

Erosion Properties and Mechanisms of B_4C/TiB_2/Mo Series Nozzles

利用热压工艺,成功制备了B4C/TiB2/Mo系列喷嘴。利用SiC磨料,对BMT系列喷嘴进行了冲蚀实验。根据冲蚀实验结果得到了BMT系列喷嘴的冲蚀磨损特性。结果表明,BMT系列喷嘴具备优良的抗冲蚀特性,其体积冲蚀磨损率最低可达0.81×10-3mm3/g。BMT系列喷嘴体积冲蚀磨损率由小到大依次为:BMT21<BMT31<BMT22<BMT23<BMT33<BMT11<BMT12<BMT32<BMT13。采用Abaqus仿真技术,结合扫描电镜技术,分析了BMT32喷嘴的冲蚀磨损机理。结果表明,BMT32喷嘴在入口处的冲蚀机制主要为脆性断裂;在出口处的冲蚀机制主要为疲劳断裂;在中间部分的冲蚀机制主要是微切削。

B4C/TiB2/Mo（BMT） series nozzles were erosion resistance properties of different nozzles in prepared successfully by hot-pressing process. Meanwhile, volume erosion rates and BMT series were analyzed according to erosion experiments using SiC as abrasive particle, It was concluded that BMT series nozzles had excellent erosion resistance, and the lowest volume erosion rate of those was 0.81×10^-3 mm^3/g. Volume erosion rate of different nozzles varied from the lowest to the highest as following： BMT21〈BMT31〈BMT22〈BMT23 〈BMT33〈BMTll〈BMT12〈BMT32〈BMT13. Combinated Abaqus simulation technology with SEM technology, erosion mechanisms of BMT32 nozzle were researched. It was shown that erosion mechanisms at entry, exit and middle of the nozzle were different. The erosion mechanism at entry of BMT32 nozzle was brittle fracture, and at exit was fatigue fracture, and at middle was micro-cutting.