The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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TENSILE BOND STRENGTH OF SOLDER JOINT BETWEEN GOLD ALLOY AND NICKEL-CHROMIUM ALLOY

금합금과 Ni-Cr 합금의 납착부 인장강도

  • Jeong, Jun-Oh (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Choi, Hyeon-Mi (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Choi, Jeong-Ho (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Ahn, Seung-Geun (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Song, Kwang-Yeob (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Park, Charn-Woon (Department of Prosthodontics, College of Dentistry, Chonbuk National University)
  • 정준호 (전북대학교 치과대학 보철학교실) ;
  • 최현미 (전북대학교 치과대학 보철학교실) ;
  • 최정호 (전북대학교 치과대학 보철학교실) ;
  • 안승근 (전북대학교 치과대학 보철학교실) ;
  • 송광엽 (전북대학교 치과대학 보철학교실) ;
  • 박찬운 (전북대학교 치과대학 보철학교실)
  • Published : 1996.04.01
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Abstract

The purpose of this study was to evaluate the tensile strength of solder joint between gold alloy and nickel-chromium alloy. The specimens were made with type III gold alloys and Ni-Cr-Be alloy and Degular Lot 2 solder. Eighteen paired specimens were made, and subdivided into three groups. Group I specimens were gold alloy-gold alloy combination, Group II specimens were gold alloy-Ni-Cr alloy combination, Group III specimens were Ni-Cr alloy-Ni-Cr alloy combination. Solder block were made with solder investment(Degussa A,G, Germany) and stored in room temperature for 24 hours. To reduce the formation of metallic oxide and increase wetting properties, flux was used before preheating and soldering procedure. The specimens were preheated at $650^{\circ}C$ and flux were applied again and gas-oxygen torch was used to solder the specimen. All soldered specimens were subjected to a tensile force in the Instron universal testing machine : the crosshead speed was 1 mm/mim. Tensile strength values of three soldered joint groups were 1. Gold alloy-Gold alloy solder joint : $$48.8kg/mm^2$$ 2. Gold alloy-Ni-Cr alloy solder joint : $$30.9kg/mm^2$$ 3. Ni-Cr alloy-Ni-Cr alloy solder joint : $$31.8kg/mm^2$$ The microscopic examination of fracture site showed cohesive and combination fracture modes in gold alloy specimens, but showed all adhesive fracture modes in Ni-Cr alloy containing specimens.

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