局部義齒用 非 貴金屬 合金의 鑄造組織과 成分分析 및 硬度에 관한 硏究 = A Study on Hardness and Analysis of a Component, Microstructure of Non-Precious Metal Alloy for Partial Denture

다국어 초록 (Multilingual Abstract)

The purpose of this study was to investigate the effect of cooling method on the change in microstructure and analysis of chemical component and physical properties of Wironium^(？) extra-hard alloy (Co-Cr alloy) in different cooling method.
The first group was a ingot in manufactory, the 2nd, slowly cooled in the furnace from 700℃ to room temperature (25℃), the 3rd, bench cooled at room temperature (25℃), the fourth, quenched in 0℃ water.
The microstructures of each specimens were compared by means of photomicrograph taken by metallurgical microscope.
In addition to this, the mechanical characteristics of each specimens were obtained using the Vickers Hardness Number(VHN and RHN)
The results were obtained as follows.
1. The analysis of Wironium^(？) extra-hard alloy showed that it had a component similar to the one presented by that of the manufacturer.
2. The grain particles in the ingot or furnace cooling, bench cooled alloy were much finer and regularly distributed than those of the quenching at 0℃ water cooled alloy.
3. The hardness value of the furnace cooled alloy (RUN value : about 57) was shown higher than that of the bench cooling or quenching at O℃ water cooling method(RHN. value about :54, 53).
4. The grain particle of alloy almost didn't have a porosity in the vacuumed casting method.

목차 (Table of Contents)

• Ⅰ. 序論
• Ⅱ. 實驗材料 및 方法
• 1) 實驗 材料
• 2) 實驗 方法
• (1) 試片 製作
• (2) 埋沒 및 燒環, 鐵造
• (3) 冷却方法 및 硏磨
• (4) 成分 分析
• (5) 硬度 測定
• (6) 組織 觀察
• Ⅲ. 實驗 結果
• 1) 成分 分析
• 2) 硬度
• 3) 金屬 表面組織
• Ⅳ. 總括 및 考察
• Ⅴ. 要約 및 結論
• 參考文獻
• 영문초록