치과용 합금 주조 시의 소환온도와 주조 후 냉각방법이 미세조직과 부식거동에 미치는 영향
The Effect of Burn-out Temperature and Cooling Rate on the Microstructure and Corrosion Behavior of Dental Casting Gold Alloy
이상혁, 함덕선, 김학관, 장웅주, 김명호,
소속 상세정보
이상혁 ( Lee Sang-Hyeok ) - (주)우리동명 치과재료연구소
함덕선 ( Ham Duck-Sun ) - (주)우리동명 치과재료연구소
김학관 ( Kim Hak-Kwan ) - (주)우리동명 치과재료연구소
장웅주 ( Jang Ju-Woong ) - (주)우리동명 치과재료연구소
김명호 ( Kim Myung-Ho ) - (주)우리동명 치과재료연구소
KMID : 0362120000220010069
Abstract
The microstructure and corrosion behavior of commercially dental casting gold alloys were investigated to clarify the effect of burn-out temperature and cooling rate. In the case of water quenching after casting, only the αphase, which is typical dendritic microstructure of golda alloy, was detected. However, the precipitates along the grain boundary were detected only at the slow cooling rate and they increased inversely proportional to the burn-out temperature. This might be due to the time difference which solute atom could diffuse. EPMA and SEM results also demonstrated that the precipitate should be lamellar structure consisted of Ag rich phase() and Cu rich phase (). In terms of corrosion, the galvanic coupling was formed due to the difference of composition between precipitates and matrix at the slow cooling rate. In the case of water quenching, the critical current density() which indicate the degree of corrosion was lowest at and below the burnout temperature, increased with it because of the effect of grain boundary segregation. But above the temperature, increased with it. This may be due to the strain field effect by residual thermal stress.
키워드
원문 및 링크아웃 정보
등재저널 정보