생체용 순수 Ti 주조체의 냉각방법에 따른 주조조직과 부식특성 및 경도에 관한 연구
A study on microstructure, corrosion characteries and hardness of pure Ti according to cooling methods.
김재도,
소속 상세정보
김재도 ( Kim Jae-Do ) - 대구산업정보대학 치기공과
KMID : 0362120010230010065
Abstract
The purpose of this study was to investigate the microstucture and hardness, corrosion of pure Ti alloy, which is widely used as partial denture frame work these days, depending on the cooling method, followed by casting. The first group was bench cooling at room temperature(), the second group was slowly cooled in the furnace from to room temperature, and third. rapidly cooled in water. The microstructure of each specimen observed by means of photomicrograph taken by electron microscope, in add to the physical characteristics of each specimen were obtained using the rockwell Hardnest Number. the characteristics of corrosion. The results were obtained as follows: 1. From Potentiodynamic plot. we conclude furnace-cooled specimen had the best stabiltity of passive film and that air-cooled specimen showed similar characteristics. The density of electric current of quenched specimen was the highest, which formed kind of unstable passive film. 2. Specimen cooled at room temperature (air cooling) had the highest value of hardness of 81.26HRB, specimen cooled at ice-water, , had the value of 78.42HRB, and specimen furnace-cooled at had lowest value of 77.1HRB. 3. Quenching treated micro-structure formed martensite structure by and large. In case of air cooling, we could see -structure widmanstatten formed overall. In furnace cooling, widmanstatten structure and various shape -structures forming colony with direction were detected.
키워드
Cooling methods; microstructure; corrosion characterics; hardness; Ti
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