臺灣博碩士論文加值系統

熔融石英及鋁矽塩類是精密鑄造主要使用的耐火材料。選用不同的耐火材料對陶殼模會有不同的影響。而熔融石英具密度低、熱膨脹係數低、比熱低等特性。此外，當含有熔融石英的陶殼模經加熱冷卻 (270℃~200℃ )後，高溫的白矽石會變態成低溫的白矽石，這也就是造成殘留破斷強度減低、容易輕殼的原因。
本研究添加不同粒徑的熔融石英於精密鑄造泥漿中與未添加熔融石英泥漿相互比較其泥漿及陶殼模性能。亦將熔融石英調配成預濕所用的稀漿，與一般所使用的稀漿，製作陶殼模試片並進行比較陶殼模性能。
研究結果顯示：泥漿中添加熔融石英對泥漿性能影響不大。面漿添加熔融石英，對殘留破斷強度影響不大。背漿添加粒徑200 mesh的熔融石英可降低殘留破斷強度，尤其以添加在背層3,4,5層，殘留破斷強度有明顯下降趨勢。
在預濕方面，同樣亦以使用200mesh熔融石英預濕的陶殼模，其殘留破斷強度有下降的趨勢。提高預濕的自轉桶轉速，可提高熔融石英的懸浮性，使預濕的陶殼模具較多的熔融石英，殘留破斷強度則明顯下降。

Both fused silica and alumino-silicate are the principal refractories for investment casting. According to the selected refractory, its effects on the ceramic shell molds will be different, too. Fused silica has the properties of low density,
low thermal expansion, and low specific heat. Besides, when the fused silica containing ceramic shell mold is heated and sintered up to 1100℃, and then cooled to 270℃, the high temperature cristobalite is transformed into low temperature cristobalite, and leads to the volume change. This phenomenon causes the decrease of the fired strength and results in the easy to remove the ceramic shell mold.
In this study, the comparison of the properties of slurry and ceramic shell mold with/without the addition of fused silica has been conducted. And the fused silica had different particle sizes. The pre-wetted low viscosity slurry was prepared from the fused silica. The ceramic shell mold properties were obtained
from the ceramic shell mold test pieces. These test pieces were made and compared with those test pieces prepared by the normal low viscosity slurry.
The results showed, the effect of fused silica addition on the slurry was mild.
And there was less effect of fused silica containing primary coat on the properties of fired strength, too. The fired strength was lowered by the addition of 200 mesh fused silica in the backup slurry. These effects were clearer when fused silica was
added in the layers 3, 4 and 5.
In the case of pre-wet, the same results were discovered, too, i.e., with the 200 mesh fused silica pre-wetted ceramic shell mold, the tendency of lower fired strength was also found. The faster the speed of the pre-wetted rotating tank, the
longer the suspension of the fused silica was shown. And the more fused silica content in the pre-wetted ceramic shell mold, the lower of the fired strength was revealed.

第一章 緒論 ...............................................1
1.1 精密鑄造 ............................................. 1
1.2 精密鑄造法種類及特性 ....................................1
1.2.1 精密鑄造種類 .........................................1
1.3 研究動機與目的 .........................................7
第二章 理論基礎與前人研究 ................................... 8
2.1 SiO2 群礦物 ........................................... 8
2.1.1 石英 .................................................11
2.1.2 鱗石英 .............................................. 12
2.1.3 白矽石 ...............................................12
2.1.4 熔融石英 ..............................................15
2.2 精密鑄造泥漿及陶殼模性能 ..................................17
2.2.1 泥漿性能 ..............................................17
2.2.2 陶殼模特性 ........ 18
2.3 文獻回顧 ................................................21
2.3.1 熔融石英文獻回顧 .......................................21
第三章 實驗流程 ..............................................22
3.1 實驗流程 ............................................. 22
3.2 實驗步驟說明 ..........................................23
3.2.1 材料分析 ............................................ 23
3.2.2 泥漿製備 ............................ 23
3.2.3 泥漿性能量測 ................. 23
3.2.4 製作陶殼模試片 ........................... 23
3.2.5 製作鑄件陶殼模 .............................30
3.2.6 陶殼模性能量測 ................... 30
3.3 實驗材料 .................................. 34
3.3.1 黏結劑 .............................34
3.3.2 耐火材料 ..........................34
3.3.3 澆鑄材料 ......................... 34
3.4 添加劑 .............................................................................................................. 35
3.5 實驗儀器 .......................................................................................................... 36
3.5.1 滾筒及球磨機 ...................................................................................... 36
3.5.2 自轉桶攪拌機 ...................................................................................... 36
3.5.3 流變儀 ................................................................................................... 36
3.5.4 pH 量測儀 ............................................................................................. 36
3.5.5 破斷強度試驗機 .................................................................................. 37
3.5.6 高溫燒結爐 .......................................................................................... 37
3.5.7 高溫透氣度試驗機 .............................................................................. 38
3.5.8 高壓蒸氣脫蠟機 .................................................................................. 38
3.5.9 XRD 粉末繞射儀 .................................................................................. 38
3.5.10 場發射型掃描式電子顯微鏡(SEM) .................................................. 38
第四章 結果與討論 .............................................................................. 39
4.1 熔融石英對泥漿壽命的影響 .......................................................................... 39
4.2 材料分析 .......................................................................................................... 45
4.3 預濕對陶殼模性能的影響 ............................................................................. 49
4.4 熔融石英對陶殼模性能的影響 ..................................................................... 50
4.5 熔融石英對陶殼模透氣度影響 ...................................................................... 59
4.6 熔融石英對鑄件殘留強度之影響 .................................................................. 67
第五章 結論 ......................................................................................... 70
1. 熔融石英對泥漿壽命的影響 ........................................................................... 70
2. 熔融石英材料分析 ........................................................................................... 70
3. 預濕對陶殼模破斷強度影響 ........................................................................... 70
4. 熔融石英對陶殼模破斷強度影響 ................................................................... 70
5. 預濕對陶殼模透氣度強度影響 ....................................................................... 71
6. 熔融石英對陶殼模透氣度影響 ....................................................................... 71
參考文獻 ............................................................................................... 72

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