Turning of Si3N4 ceramics preheated by Laser

레이저 예열에 의한 $Si_3N_4$ 세라믹스의 선삭가공

  • 김선원 (한국기계연구원 정보장비연구센터) ;
  • 이제훈 (한국기계연구원 정보장비연구센터) ;
  • 서정 (한국기계연구원 정보장비연구센터) ;
  • 신동식 (한국기계연구원 정보장비연구센터)
  • Published : 2007.05.30

Abstract

Silicon Nitride ($Si_3N_4$), which is widely used in a variety of applications, is hard-to-machine due to its high hardness. At high temperature (e.g. above $1000^{\circ}C$), however, the machinability can be greatly improved. In this work, we used a $CO_2$ laser with a high absorptivity to $Si_3N_4$ of 0.9 to preheat the surface of a rothting $Si_3N_4$ rod. Preheating and turning of $Si_3N_4$ was executed at the same time. The result of machining was MRR of $8.0mm^3/s$ that is four times faster than normal grinding. Continuous chip formation was observed by a microscope.

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