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KMID : 0362219950220020131
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Journal of The Korean Research Society for Dental Materials
1995 Volume.22 No. 2 p.131 ~ p.139
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TENSILE STRENGTH OF 14K GOLD-ALLOY SOLDERED JOINTS IN TITANIUM
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Kim Tae-Jo
Chu Young-Ho
Lee Min-Ho
Bae Tae-Sung
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Abstract
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This study was performed to evaluate the effect of surface roughness on the flow of a 14K gold solder and the tensile strength of solder joints in titanium. To evaluate the flow of 14K gold solder on titanium, the spreading area of solder 10mg at 840℃ was measured on the titanium plate of 15 ×15 ×1mm. Two pieces of titanium rod 30mm in length and 3mm in diameter were butt-soldered using a electric resistance heating and tensile test was subjected to a crosshead speed of 0.5mm/min. Titanium surfaces were polished with ＃80∼＃2000 emery paper and blasted with 50㎛ glass bead or alumina. The solder-matrix interface region was analyzed by EPMA.
The results obtained were summarized as follows ;
1. Maximum spreading area was obtained when the surfaces were polished with ＃240 emery paper, the spreading area decreased with the decrease of surface roughness.
2. Maximum tensile strength value was 398.18 ±15.82 MPa when the soldering surfaces were polished with ＃2000 emery paper, and tensile strength increased with the decrease of surface roughness.
3. EPMA data for the solder matrix interface region revealed that the diffusion of Au and Cu occured to the titanium matrix, and the reaction zone in the solder showed the increase of Au, Cu, and Ti.
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