대한치과보철학회지 (The Journal of Korean Academy of Prosthodontics)

  • 제41권4호
  • /
  • Pages.440-450
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  • 2003
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  • 0301-2875(pISSN)
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  • 2005-3789(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
권호 표지

레이저 융합된 Co-Cr 합금의 물리적 성질에 관한 연구

MECHANICAL PROPERTIES OF LASER WELDED Co-Cr ALLOY

  • 배기창 (경희대학교 치과대학 치과보철학교실) ;
  • 우이형 (경희대학교 치과대학 치과보철학교실) ;
  • 이성복 (경희대학교 치과대학 치과보철학교실)
  • Bae Ki-Chang (Department of Prosthodontics, Division of Dentistry, Graduated School, Kyung Hee University) ;
  • Woo Yi-Hyung (Department of Prosthodontics, Division of Dentistry, Graduated School, Kyung Hee University) ;
  • Lee Sung-Bok (Department of Prosthodontics, Division of Dentistry, Graduated School, Kyung Hee University)
  • 발행 : 2003.08.01
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초록

Statement of problem : The joints of removable partial denture alloys have failed frequently after routine usage. Purpose : The purpose of this study was to evaluate the mechanical properties of the laser welded Co-Cr alloys. Material and method : For this study 20 Co-Cr specimens were casted and 10 of them were seperated on the middle area and laser welded with Alpha laser welding machine(Siro Lasertec, Pforzheim, Germany). Rest of them which were as cast, were used as a control group. For the section of the experimental specimens, wire cutting machine was used to make a even gap of the all specimens. Laser welding was done with manufacturer's instrunction and tested each specimen by Instron Machine. Tensile strength, 0.2% yield strength and % elongations were recorded. Fractured surfaces were investigated with SEM. Results : The results were as follows : 1. The tensile strength of the laser welded group(617.7MPa) was about 75% of the as cast group(820.4MPa). It had stastically significant differences(p<0.05). 2. The % elongation of the experimental group was 6.6 which was lower than the control group(14.3). 3. Fracture of the experimental group occured in the welded surface and showed many voids. In contrast, the fracture surface of the control group was showed rough surfaces without any voids. Conclusion : The tensile strengths of the as-cast joints were higher than those for the laser welded joints, and the % elongation of the experimental group was lower than the control group. Porosity was found in laser-welded joints.

키워드

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