| Project/Area Number |
09672014
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | The Nippon Dental University School of Dentistry |
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Principal Investigator |
OHKUMA Kazuo The Nippon Dental University School of Dentistry Dentistry, Departmant of Dental Materials Science, assistant, 歯学部, 助手 (50203740)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
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| Keywords | Dual phase alloy / Hardness / 18wt%Au-40Ag-20Pd-22Cu alloy / Bending strength / Tensile strength / Color stability / Gold addition / Alloys for laser / 二相構造合金 |
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| Research Abstract |
High levels of tensile strength and elongation are required to make clasps. We used laser irradiation to harden only the surface layer of a Gold-Silver-Palladium alloy partially hardened by laser irradiation, to yield high elasticity and fatigue resistance. We evaluated laser-irradiated Silver-palladium-copper alloys for laser irradiation, in terms of the mechanical characteristics, and obtained the following results.
The laser-produced surface modification in an 18 wt%Au-4OAg-2OPd-22Cu alloy after softening heat treatment, increased hardness (1O6% higher than by softening heat treatment), and bending strength (15% higher than by softening heat treatment) and decreased elongation (21%-Iower than by softening heat treatment). The luminosity (L*) of the laser-produced surface modification in a l8wt%Au-4OAg-2OPd-22Cu alloy immersed in 0.100 Na2S solution at 37 * for 3 days was 73.07.
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