| 질화규소 세라믹의 레이저 예열선삭에 관한 연구 (Ⅱ)예열선삭된 SSN 및 HIPSN 질화규소 세라믹의 표면특성 |
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| A Study on Laser Assisted Machining for Silicon Nitride Ceramics (Ⅱ) - Surface Characteristics of LAM Machined SSN and HIPSN |
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Jong-Do Kim, Su-Jin Lee, Tae-Young Kang, Jeong Suh, Jae-Hoon Lee |
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| Abstract |
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This study focused on laser assisted machining (LAM) of silicon nitride ceramic that efficiently removes the material through machining of the softened zone by local heating. The effects of laser-assisted machining parameters were studied for cost reduction, and active application in processing of silicon nitride ceramics in this study. Laser assisted machining of silicon nitride allows effective cutting using CBN tool by local heating of the cutting part to the softening temperature of YSiAlON using by the laser beam. When silicon nitride is sufficiently preheated, the surface is oxidized and decomposed and then forms bloating, micro crack and silicate layer, thereby making the cutting process more advantageous. HIPSN and SSN specimens were used to study the machining characteristics. Higher laser power makes severer oxidation and decomposition of both materials. Therefore, HIPSN and SSN specimens were machined more effectively at higher power. |
| Key Words:
SSN, HIPSN, HPDL, LAM, Surface variation, Vickers hardness |
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