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KMID : 0362419960340010143
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Journal of Korean Academy of Prosthodontics
1996 Volume.34 No. 1 p.143 ~ p.150
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Tensile bond stregth of solder joint betweenn gold alloy and nickel-hromium alloy
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Jeong Jun-Oh
Choi Hyeon-Mi
Choi Jeong-Ho
Ahn Seung-Geun
Song Kwang-Yeob
Park Charn-Woon
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Abstract
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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℃ 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/min. @ES Tensile strength values of three soldered joint groups were @EN 1. Gold alloy-Gold alloy solder joint : 48.8 kg/㎟ 2. Gold alloy -Ni-Cr alloy solder joint : 30.9 kg/㎟ 3. Ni-Cr alloy -Ni-Cr alloy solder joint : 31.8 kg/㎟ 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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