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A Study for Low Carat Gold Alloys with Age-hardenability at Intraoral Temperature

Research Project

Project/Area Number 11671940
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 補綴理工系歯学
Research InstitutionNagasaki University

Principal Investigator

HISATSUNE Kunihiro  School of Dentistry, Nagasaki University, Professor, 歯学部, 教授 (20037526)

Co-Investigator(Kenkyū-buntansha) TANAKA Yasuhiro  School of Dentistry, Nagasaki University, Instructor, 歯学部, 助手 (10217086)
SHIRAISHI Takanobu  School of Dentistry, Nagasaki University, Assoc. Prof., 歯学部, 助教授 (10150468)
TAKUMA Yasuko  School of Dentistry, Nagasaki University, Research Fel., 歯学部, 教務職員 (60160074)
MIURA Eri  School of Dentistry, Nagasaki University, Instructor, 歯学部, 助手 (70315258)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsdental alloy / gold alloy / superlattice / phase transformation / age-hardening / electron microscope / X-ray diffraction / 電気抵抗 / ビッカース硬さ / 低温時効
Research Abstract

Gold alloys are one of the most useful materials in dental treatment. The required strength is an application of heat treatment wife age4iardening,The hardening is controlled by the formation of ordered phase with L1_0 structure. However, there appears one serious problem of the. deformation on prosthetics, because the L1_0 is different from the matrix phase (fcc) in crystal structure. The purpose of the present study is to clarify the possibility for use of L1_2 phase (fcc) having the same structure. As an L1_2 structure, Cu_3Au and CuAu_3 were selected. Four binary and six ternary alloys were prepared by vacuum-melting in a high-frequency induction furnace. After the solution treatment, two modes were employed, namely anisothermal and isothermal annealings. Th age-hardening behaviors were examined by electrical resistivity measurements, hardness tests, X-ray diffraction and transmission electron microscopy. The main results were as follows ;
(1) It is difficult for only L1_2 phase to obtain appropriate strength for dental prosthetics. Partial introduction of the L1_0 phase (CuAu I) is demanded for the required strength.
(2) Remarkable age-hardening was due to the formation of the CuAu I ordered phase in the Au_3Cu ordered matrix.
(3) Three types of phase transformation in the grain interior from the disordered phase to the equilibrium phases (L1_0 + L1_2) were detected during the isothermal aging. The difference can be interpreted in terms of the free energy.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Htain Winn: "Phase Transformations and Age-hardening Behaviors related to AuCu in Au-Cu-Pd Alloys"Dental Materials Journal. 18・3. 218-234 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Htain Winn: "Two Types of Checkerboard-like Microstructures in Au-Cu-Pd Ternary Alloys"Journal of Alloys & Compounds. 306. 262-269 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Htain Winn: "Characteristic Microstructures associated with Order-Disorder Transition in An-Cu-Pd Ternary Alloys"Scripta Materialia. 43・4. 313-317 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.J.Seol: "Effects of Zn Addition to AuCu on Age-hardening Behaviors at Intraoral Temperature"Journal of Materials Science ; Materials in Medicine. 13・2. 237-241 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.J.Seol: "Partial Phase Diagram for the AuCu-Zn Pseudobinary System"Journal of Alloys & Compounds. (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Htain Winn: "Phase Transformations and Age-hardening Behaviors rfelated to AuCu in Au-Cu-Pd Alloys"Dent. Mater. J.. 18-3. 218-234 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Htain Winn: "Two Types of Checkerboard-like Microstructures in Au-Cu-Pd Ternary Alloys"J. Alloys & Comp.. 306. 262-269 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Htain Winn: "Characteristic Microstructures associated with Order-Disorder Transition in Au-Cu-Pd Ternary Alloys"Scripta Mater. 43-4. 313-317 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Seol: "Effects of Zn Addition to AuCu on Age-hardening Bihaviors at Intraoral Temperature"J. Mater. Sci. : Mater. Med.. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Seol: "Partial Phase Diagram for the AuCu-Zn Pseudobinary System"J. Alloys & Comp.. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Htain Winn: "Phase Transformations and Age-hardening Behaviors related to AuCu in Au-Cu-pd Alloys"Dental Materials Journal. 18・3. 218-234 (1999)

    • Related Report
      2001 Annual Research Report
  • [Publications] Htain Winn: "Two Types of Checkerboard-like Microstructures in Au-Cu-pd Ternary Alloys"Journal of Alloys & Compounds. 306. 262-269 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Htain Winn: "Characteristic Microstructures associated with Order-Disorder Transition in An-Cu-pd Ternary Alloys"Scripta Materialia. 43・4. 313-317 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Seol: "Effects of Zn Addition to AuCu on Age-hardening Behaviors at Intraoral Temperature"Journal of Materials Science : Materials in Medicine. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Seol: "Partial Phase Diagram for the AuCu-Zn Pseudobinary System"Journal of Alloys & Compounds. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Kim,H.I.: "Phase transformation behavior in a multipurpose dental casting gold alloy during continuous heating"Journal of Materials Science : Materials in Medicine. 11. 61-66 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Htain Winn: "Two types of checkerboard-like microstructures in Au-Cu-Pd ternary alloys"Journal of Alloys and Compounds. 306. 262-269 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Htain Winn: "Characteristic microstructures associated with order-disorder transition in Au-Cu-Pd ternary alloys"Scripta Materialia. 43. 313-317 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Htain Winn: "Coherent phase diagram of Au-Cu-Pd ternary system near and within the two-phase region of Au_3Cu and AuCu I ordered phase"Journal of Alloys and Compounds. 308. 269-274 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Lee,K.H.: "Phase transformation of a dental casting gold alloy during anisothermal annealing"The Journal of the Korea Research Society for Dental Materials. 27・3. 217-222 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Lee,K.H.: "Heat treatment and phase transformation of a dental casting Au-Zn-Pt alloy"The Journal of the Korea Research Society for Dental Materials. 27・3. 223-230 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Htain Winn: "Phase transformations and age-hardening behaviors related to Au_3Cu in Au-Cu-Pd alloys"Dental Materials Journal. 18・3. 218-234 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] R.I.Hernandez: "Phase transformation mechanisms in (AuCu)_<1-X>Pdx Pseudo binary alloys by direct aging method"Dental Materials Journal. 18・3. 235-247 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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