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분말사출성형된 17-4 PH STS의 기공율에 따른 강도 모델
성환진,하태권,안상호,장영원 한국분말야금학회 2003 한국분말야금학회 학술대회논문집 Vol.2003 No.1
분말야금된 소결체의 가장 큰 특징 중의 하나는 피할 수 없는 소결체의 기공이다. 이러한 기공이 기계적 특성에 미치는 영향에 관해서는 많은 연구가 오래 전부터 진행되었었다. 그러나 기존의 연구는 거의 대부분 일반 분말야금에 의한 것이고 분말사출성형된 소결체의 기공율과 기계적 특성 광계는 거의 연구가 이루어 지지 않았다. 본 연구에서는 기공율의 조절이 용이한 분말사출성형 공정을 이용하여 소결 초기부터 완전 치밀화에 가까운 조직까지 다양한 소경율의 시편을 만
분말사출성형된 17-4 PH STS 소결체의 밀도에 따른 인장 특성
성환진,하태권,안상호,장영원 한국분말야금학회 2002 한국분말재료학회지 (KPMI) Vol.9 No.4
It is well known that the powder injection molding(PIM) process can overcome the shape limitations of traditional powder compaction, the costs of machining, the productivity limits of isostatic pressing and slip casting, and the defect and tolerance limitations of conventional casting. Increasing demands from industry for not only the dimensional accuracy nut mechanical strength in PIMed parts have had much effort focused on the investigation of mechanical properties of mechanical strength in PIMed parts have had much effort focused on the investigation of mechanical properties of sintered parts formed with high-strength metallic powders. The 17_4 PH $10\mu{m}$ were injection-molded into flat tensile specimens. Sintering of the compacts was carried out at the various temperatures ranging from 900 to $1350^{\circ}C$. Sintering behavior of the compacts and tensile properties of sintered specimens were investigated.
성환진,하태권,안상호 한국분말야금학회 2002 한국분말야금학회 학술대회논문집 Vol.2002 No.1
분말사출성형(PIM, Powder Injection Molding) 기술은 금속, 초경 또는 세라믹 등과 같은 소결 가능한 분말을 유기결합체와 혼압하고 이를 기존의 사출성형법을 이용하여 일정한 형상으로 성형한 다음 결합제 제거정 공정을 거처 최종 고온 소결함으로써 3차원의 복잡한 형상의 부품을 후가공 없이 정밀하게 대량 생산 할 수 있는 신분말 성형 기술이다.기계 , 항공,전자정보,반도체,의료 등의 제반 분야에서 산업 및 생활기기들이 초소형화, 초정밀
분말사출성형에 의한 WC-Co 계 milling insert 제조
성환진 한국분말야금학회 1999 한국분말재료학회지 (KPMI) Vol.6 No.1
The purpose of this study is to investigate the manufacturing feasibility of WC-Co milling inserts via Powder Injection Molding (PIM) process. WC-Co is used in a wide variety of cutting tools due to its high hardness, stiffness, compressive strength and wear resistance properties. WC-Co parts for a high stress application were conventionally produced by the press and sinter method, which were Iimited to 2 dimensional shapes. Manufacturing WC-Co parts for a high stress application by PIM implies that tool efficiency can be highly improved due to increased freedom is design. P30 grade WC powder (WC-Co-TiC-TaC system) was mixed with RIST-5B133 binder and injection molded into milling inserts (Taegu Tech. Model WCMX 06T 308). The mean grain size of the powder was about 0.8$\mu$m. Injection molded specimens were debound by solvent extraction and thermal degradation method at various conditions. The specimens were sintered at 140$0^{\circ}C$ for 1 hr in vacuum. Carbon content, weight loss, dimensional change, and macro defects of the specimen were carefully monitored at each stage of the PIM process. PIMed WC-Co milling inserts reached 100% full density after sinteing. Its mechanical properties and micro-structures were comparable with the press and sintered milling insert. Carbon content of the sintered WC-Co insert was mainly determained by the atmosphere of thermal debinding. By controlling powder loading and injection molding condition, dimensional accuracy could be obtained within 0.4%. We confirm that PIM can not only be an alternative manufacturing method for WC-Co parts economically but also provide a design freedom for more effieient cutting tools.