工程陶瓷微爆轰弧加工过程的观察与分析

建立了微爆轰弧加工(MDAM)实验系统,对工程陶瓷MDAM过程进行观察及分析.通过运用高速摄像和电流信号测量技术手段,对微爆轰弧的外观形态及工作电流对其影响进行了分析,对Si3N4和Al2O3两种材料的轰击蚀坑形成过程进行了高速摄像观察,并利用扫描电镜(SEM)观察了轰击蚀坑的表面及截面形貌.结果表明,微爆轰弧的直径随...

Observation and Analysis of Micro-detonation Arc Machining Process for Engineering Ceramic

An experimental system is established to observe and analyze the micro-detonation arc machining(MDAM) process.By means of high speed photography and current signal acquisition,the relationship between the external shape of micro-detonation arc and the working current is studied.The formations of ablation pit in Si3N4 and Al2O3 are observed by using high speed photography and the surface and cross-section topography are observed by using scanning electron microscape(SEM).The experimental results show that the diameter of micro-detonation arc increases with the working current and the diameter of ablation pit expands with the machining time;Si3N4 ceramic can decompose in machining,the surface structure is loosen,and some transverse cracks at subsurface are produced by thermal shock;Al2O3 ceramic can directly melt in machining,lots of micro-cracks distribute on the surface,and the main composition of deteriorative layer in grass phase.