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초소형 스퍼기어 제조를 위한 초소성 A1-78Zn 분말 압출
이경훈(K. H. Lee),김진우(J. W. Kim),황대원(D. W. Hwang),김종현(J. H. Kim),장석상(S. S. Chang),김병민(B. M. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
This study was designed to fabricate the micro-electro-mechanical systems (MEMS) parts such as micro spur gears using hot extrusion of gas atomized Al-78Zn powders. For this purpose, it is important to develop new methods to fabricate micro-dies and choose suitable extrusion conditions for a micro-forming. Micro-dies with Ni were fabricated by LIGA technology. LIGA technology was capable to produce micro-extrusion dies with close tolerances, thick bearing length and adequate surface quality. Superplastic Al-78Zn powders have the great advantage in achieving deformation under low stresses and exhibiting good micro formability with average strain rates ranging from 10<SUP>-3</SUP> to 10<SUP>-2</SUP> s<SUP>-1</SUP> and constant temperatures ranging from 503 to 563K. Al-78Zn powders were compacted into a cylindrical shape (Φ3xh10) under compressive force of 10kN and, subsequently, the compacted powders were extruded at 563K in a hot furnace. Micro-extrusion has succeeded in forming micro-gear shafts.