短時間鑄造法에 의한 非貴金屬合金鑄造體의 適合精度와 金屬組織에 關한 硏究 = A Study on the Fitness Accuracy and Microstructure of Non-precious Matal Castings by Quick Heat - up Pocedures

다국어 초록 (Multilingual Abstract)

The purpose of this study was to investigate the fitness accuracy and microstructure of Ni-Cr dental alloy castings by quick heat-up procedures.
Fitness between metal mould and castings was measured by ready made metal mould in upper dia. 9㎜., lower dia. 10㎜, height 10㎜.
Microstructure was observed by metallurgical microscope after etched acid solutions.
The results were as follows:
1. The fitness accuracy of normal procedures was 9~31㎛, and the average was 20㎛.
2. The fitness accuracy of quick heat-up procedures was 12-34㎛, and the average is 22㎛.
3. The fitness acccuracy of quick heat-up procedures were more than normal procedures, but was similar to it.
4. Microstructure of normal proedures was finer grain size than quick heat-up proedures, and existed in porosities and dendrite structure by both procedures.

목차 (Table of Contents)

• Ⅰ. 序論
• Ⅱ. 實驗材料 및 方法
• Ⅲ. 實驗結果
• Ⅳ. 總括 및 考察
• Ⅴ. 結論