歯科ろう付に関する研究 (第11報) : 赤外線ろう付における各種合金の前ろう付強度について

概要

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The purpose of this study was to compare the differcence of the tensile strength of presoldered joints between the infrared soldering and the torch soldering with regard to Au-Pt, Pd-Cu and Ni-Cr alloy. The conclusions were obtained as follows : 1. No significant difference of the tensile strength of presoldered joints were obtained between the infrared soldering and the torch soldering respectively in Au-Pt, Pd-Cu alloy. In Ni-Cr alloy, the tensile strength of presoldered joints presoldered by the infrared soldering was statistically stronger than the torch soldering (a=0.05). However, the revised tensile strength of both soldering in the alloy were similar. It was suggested that porosity might be one of critical factors on the tensile strength of presoldered joints. 2. Comparing porosity ratio of presoldered joints between the infrared soldering and thetorch soldering, no significant difference were obtained respectively in Au-Pt and Pd-Cu alloy. In Ni-Cr alloy, porosity ratio of the infrared soldering was one-third as much as the torch soldering. It had to be recomended that the infrared soldering should be employed when Ni-Cr alloy was used.
1991-08-01