超声空化对多孔氮化钛颗粒的破碎作用(英文)

Fragmentation of Porous TiN Particles by Ultrasonic Cavitation

采用功率超声处理设备研究了超声空化对多孔TiN颗粒的破碎作用.激光粒度分析结果表明随着超声作用时间的延长,多孔TiN颗粒发生破碎,经过一定时间超声作用后会有大量的亚微米级颗粒生成(0.2μm^1μm)。较系统地研究了超声功率、处理时间、颗粒含量、液体体积对多孔TiN颗粒破碎过程的影响。结合扫描电镜结果分析了超声空化对多孔氮化钛颗粒的破碎机理。

In this study,a high-intensity ultrasonic treatment system was used for the fragmentation of micrometer sized porous TiN ceramic particles in the range of 100~700 μm. Fragmentation of particles was observed and substantial sub-micron particles（ranging from 0. 2~1μm）were obtained by laser particle size analyzer. The effects of various pa-rameters such as applied ultrasonic power,treatment time,solids concentration and liquid volume on fragmentation were investigated. The results indicated that the relationship between the specific ultrasound energy and the mean particle size of the particles can be described by an empirical size-energy model. Based on laser particle size analyzer and SEM,the mechanism of fragmentation of porous TiN was proposed and characterized. The fraction of sub-micron particles became more pronounced with increased duration and applied power,but with decreased solids concentration and suspension volume. Through incorporation with XRD and DSC, the lattice strain induced in particle during ultrasonic treatment was detected.