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관교의치용 Au-Ag-Cu-Pt-Zn 합금의 시효경화성과 관련된 상변태와 입계석출
Phase transformation and grain boundary precipitation related to the age-hardening of an Au-Ag-Cu-Pt-Zn alloy for crown and bridge fabrication

첫 페이지 보기
  • 발행기관
    대한치과기공학회 바로가기
  • 간행물
    대한치과기공학회지 KCI 등재후보 바로가기
  • 통권
    Vol.34 No.4 (2012.12)바로가기
  • 페이지
    pp.345-352
  • 저자
    조미향
  • 언어
    한국어(KOR)
  • URL
    https://www.earticle.net/Article/A189916

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원문정보

초록

영어
Purpose: The age-hardening mechanism of an Au-Ag-Cu-Pt-Zn alloy for crown and bridge fabrication was investigated by means of hardness test, X-ray diffraction study and field emission scanning electron microscopic observation. Methods: Before hardness testing, the specimens were solution treated and then were rapidly quenched into ice brine, and were subsequently aged isothermally at 400-450℃ for various periods of time in a molten salt bath and then quenched into ice brain. Hardness measurements were made using a Vickers microhardness tester. The specimens were examined at 15 kV using a field emission scanning electron microscope. Results: By the isothermal aging of the solution-treated specimen at 450℃, the hardness increased rapidly in the early stage of aging process and reached a maximum hardness value. After that, the hardness decreased slowly with prolonged aging. However, the relatively high hardness value was obtained even with 20,000 min aging. By aging the solution-treated specimen, the f.c.c. Au-Ag-rich a0 phase was transformed into the Au-Ag-rich a1 phase and the AuCuⅠ ordered phase. Conclusion: The hardness increase in the early stage of aging process was attributed to the formation of lattice strains by the precipitation of the Cu-rich phase and then subsequent ordering into the AuCuⅠ-type phase. The decrease in hardness in the later stage of aging process was due to the release of coherency strains by the coarsening of tweed structure in the grain interior and by the growth and coarsening of the lamellar structure in the grain boundary. The increase of inter-lamellar space contributed slightly to the softening compared to the growth of lamellar structure toward the grain interior.

목차

Abstract
 Ⅰ. 서론
 Ⅱ. 연구 방법
  1. 사용 합금
  2. 열처리(Heat treatment)
  3. 경도시험 (Hardness test)
  4. X선회절 (X-Ray Diffraction) 실험
  5. 전계방사주사전자현미경 (Field emission scanning election microscope, FE-SEM) 관찰
 Ⅲ. 결과
  1. 경도시험
  2. 결정구조의 변화
  3. 미세조직의 변화
 IV. 고찰
 V. 결론
 REFERENCES

키워드

age-hardening AuCuⅠ coarsening lamellar structure precipitation

저자

  • 조미향 [ Mi-Hyang Cho | 원광보건대학교 치기공과 ] 교신저자

참고문헌

자료제공 : 네이버학술정보

간행물 정보

발행기관

  • 발행기관명
    대한치과기공학회 [The Korean Academy Of Dental Technology]
  • 설립연도
    1979
  • 분야
    의약학>치의학
  • 소개
    본 학회는 치과기공에 관한 모든 분야의 연구와 회무를 총괄하기 위하여 세분화된 분과학회의 회원 상호간 학술교류와 정보를 수집하고, 보수교육 및 학술대회 준비, 진행과 학회지 발간등의 업무를 효율적으로 수행함을 목적으로 한다.

간행물

  • 간행물명
    대한치과기공학회지 [THE JOURNAL OF KOREAN ACADEMY OF DENTAL TECHNOLOGY]
  • 간기
    계간
  • pISSN
    1229-3954
  • eISSN
    2288-5218
  • 수록기간
    1979~2026
  • 등재여부
    KCI 등재
  • 십진분류
    KDC 515 DDC 617

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