Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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A Study on Improvement of Metal-Ceramic Bonding Strength by Addition of Aluminum to Casting Metal Alloy

도재주조용 합금에 있어서 알루미륨 첨가에 따른 metal-ceramic과의 결합력 증진에 관한 연구

  • Lee, Jae-Won (Surface Science Lab. Dept. of Chemistry, Sungkyunkwan University) ;
  • Min, Byong-Kuk (Dept. of Dental Laboratory Technology, Dongnam Health Science College) ;
  • Han, Min-Soo (Dept. of Porcelain Technology, Myongji University)
  • 이재원 (성균관대학교 화학과 표면연구실) ;
  • 민병국 (동남보건대학 치기공과) ;
  • 한민수 (명지대학교 도자기 기술학과)
  • Published : 2002.01.30
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Abstract

The Purpose of this study was to investigate the chemically improvement of metal-ceramics bond strength in the course of recasting Ni-Cr metal composite system with 10wt.%, 20wt.% and 30wt.% aluminum respectively. We have tested the bond strength, micro-structure, chemical composition of each metal composites and metal- ceramic bond interfaces by 3-point bending strength tester, SEM and EDS. We have made the conclusions through this study as follow: 1. The most suitable amount of aluminum to the Ni-Cr metal composite recasting is 20wt. % for improving metal-ceramics bond strength with debonding strength value of 49.54 kgf/mm2. 2. The aluminum must be changed to small spread alumina like phases and second aluminum-metal composites phases in the morphology of Ni-Cr metal composite system by adding during it's casting. These second phases have inclined functional oxide phases mixed with metal elements and they must take roll to improvement of metal-ceramics bond strength. 3. In the case of 30wt.% aluminum appended to Ni-Cr metal composite system, an excess of second inclined functional oxide phases produce cracks and spalling of them apart from it's base material. It must be a important factor of reduction of metal-ceramics bond strength.

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