Optimizing mechanical properties of laser-welded gold alloy through heat treatment

Dental Materials : Official Publication of the Academy of Dental Materials
Ikuya WatanabeT Okabe

Abstract

The goal of this work was to improve the mechanical strength of laser-welded gold alloy with age-hardenability at intraoral temperature. The gold alloy was cast conventionally in plate patterns (0.5 mm x 3.0 mm x 20 mm). After bench-cooling the mold to room temperature (as-cast state), transverse sections of the plate were made at mid-span. They were butted against one another and welded using Nd:YAG laser (current: 320 A; time: 10 ms; spot diameter: 1 mm). Three laser pulses were applied from both sides to cover the joint width (3.0 mm) of the specimens before or after solution heat treatment at 700 degrees C/5 min. Uncut control specimens (non-welded) were also prepared. After solution treatment, two different heat treatments were given the laser-welded specimens: high-temperature aging at 250 degrees C/15 min, or intraoral aging at 37 degrees C/3 days. Control specimens underwent all of the heat treatments after solution treatment. Tensile testing was conducted at a crosshead speed of 2 mm/min and a gauge length of 10 mm. Solution treatment of the gold alloy before laser-welding did not improve the mechanical strength of laser-welded gold alloy after high-temperature aging or intraoral aging. The joint strengths of laser-wel...Continue Reading

References

Jul 1, 1972·Journal of Dental Research·K F LeinfelderD F Taylor
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Nov 1, 1994·Dental Materials : Official Publication of the Academy of Dental Materials·I WatanabeK Hisatsune

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Citations

Jul 12, 2008·European Journal of Orthodontics·Jens Johannes BockRobert Andreas Werner Fuhrmann
Oct 1, 2011·Journal of Oral Science·Hisaji KikuchiTakayuki Yoneyama
Mar 27, 2012·Dental Materials Journal·Yasuko TakayamaChikahiro Ohkubo
Dec 12, 2013·Lasers in Medical Science·Youssef S Al JabbariSpiros Zinelis
Dec 18, 2008·Journal of Applied Oral Science : Revista FOB·Jens Johannes BockRobert Andreas Werner Fuhrmann

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