Al₂O₃ 與SiC 微米級顆粒添加對精密鑄造強化殼模的力學、熱學和物理性能的影響

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王永群(Yung-Chun Wang) 查詢紙本館藏

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能源工程研究所

論文名稱

Al₂O₃ 與SiC 微米級顆粒添加對精密鑄造強化殼模的力學、熱學和物理性能的影響
(Effects of Al₂O₃ and SiC micro-scale powder addition on mechanical, thermal and physical properties of reinforced shell for investment casting)

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至系統瀏覽論文 (2029-7-1以後開放)

摘要(中)

本研究探討在精密鑄造的背層漿料中添加15 wt% 的微米級 Al₂O₃ 和 SiC 粉末對陶瓷殼模機械、熱及物理性質的影響。結果顯示，在高層數下，添加 Al₂O₃ 和 SiC 粉末製成的陶瓷殼模的斷裂模數（MOR）分別達到 8.41 MPa 和 8.10 MPa，分別比原始配方的 6.66 MPa 高出 26.28% 和 21.62%。Al₂O₃ 陶瓷殼模的孔隙率較低（12%-15%），表面更加緻密。SiC 陶瓷殼模的孔隙率（13% 到 17%）與原始配方相似。儘管孔隙率相似，SiC 陶瓷殼模的透氣性較原始配方低，這是由於 SiC 顆粒影響了氣流；而 Al₂O₃ 殼模的透氣性最低，範圍為 1.3x10-¹³ m² 到 1.3x10-¹² m²，表面無可見孔隙且結構緻密。添加 Al₂O₃ 粉末顯著提高了 MOR，並減少了孔隙率和透氣性，而 SiC 粉末也提高了 MOR，但其孔隙率和透氣性高於 Al₂O₃ 陶瓷殼模。添加 Al₂O₃ 粉末和 SiC 粉末均提高了陶瓷殼模的 HTC。Al₂O₃ 殼模 HTC 的增加是由於其緻密結構和相對於鋯砂更高的熱導率；而 SiC 殼模 HTC 的增加則歸因於 SiC 粉末本身具有高熱導率。這些結果為優化精密鑄造陶瓷殼模配方提供了重要參考。

摘要(英)

This study investigates the effect of adding 15 wt% of micro-scale Al₂O₃ and SiC powders to the backup coat slurry of investment casting on the mechanical, thermal and physical properties of shell molds. The results show that the modulus of rupture (MOR) of the shell molds made with Al₂O₃ and SiC powders reached 8.41 MPa and 8.10 MPa, respectively, at high layer counts, which were 26.28% and 21.62% higher than the original formulation of 6.66 MPa, respectively. The Al₂O₃ shell molds have a lower porosity (12%-15%) and a denser surface. The porosity of SiC shells (13% to 17%) was similar to that of the original formulation. Despite the similar porosity, the permeability of the SiC shells was lower than that of the original formulations due to the particles affecting the air flow, while the Al₂O₃ shells had the lowest permeability, ranging from 1.3x10-¹³ m² to 1.3x10-¹² m², with no visible pores on the surface and a dense structure. The addition of Al₂O₃ powder significantly increased the MOR and decreased porosity and permeability, while SiC powder also increased the MOR, but its porosity and permeability were higher than that of Al₂O₃ shell molds. Adding Al₂O₃ powder and SiC powder both enhance the HTC of the shell molds. The increased HTC in Al₂O₃ shell molds is due to their dense structure and the relatively higher thermal conductivity compared to zircon sand. The rise in HTC for SiC shell molds is attributed to the inherently high thermal conductivity of SiC powder. These results provide an important reference for the optimization of investment casting shell mold formulations.

關鍵字(中)

★ 精密鑄造
★ 殼模
★ 殼模層數
★ Al₂O₃和SiC粉末
★ 殼模斷裂模數(MOR)
★ 殼模孔隙率
★ 殼模透氣性

關鍵字(英)

★ investment casting
★ shell mold
★ Al₂O₃ and SiC powder
★ modulus of rupture (MOR)
★ porosity
★ permeability
★ heat transfer coefficient (HTC)

論文目次

摘　要 I
Abstract III
誌　謝 V
圖目錄 XI
表目錄 XV
第一章：緒論 1
1-1　前言 1
1-2　研究動機與方法 5
第二章：文獻回顧 7
2-1　精密鑄造 7
2-2　精密鑄造用殼模及其性能指標 7
2-3　殼模漿料添加物 8
2-4　傳熱係數對精密鑄造的影響 9
第三章：材料與實驗設置 10
3-1　實驗設備 10
第四章：原配方、Al2O3及SiC殼模測試結果與探討 19
4-1　材料與殼模製備 19
4-2　殼模性質測量與計算 22
4-2-1 斷裂模數 (Modulus of rupture, MOR) 22
4-2-2 殼模透氣性 (Permeability) 23
4-2-3 殼模孔隙率 (Porosity) 24
4-2-4 傳熱係數 (Heat transfer coefficient, HTC) 26
4-3 結果與討論 31
4-3-1 殼模MOR試驗之結果 31
4-3-2 孔隙率試驗之結果 33
4-3-3 殼模透氣性試驗之結果 35
4-3-3 殼模傳熱係數試驗之結果 37
4-3-4 MOR和透氣性的綜合討論 40
第五章：結論 42
參考文獻 45
第六章：附錄 48
6-1 精密鑄造渦流流量計設計方案與其缺陷說明 48
6-2 殼模熱性質(傳熱係數)與模擬 53
6-2-1 殼模熱性質 53
6-2-2 數值模擬 55
6-2-3 Niyama criterion 57
6-3 結果與討論 58
6-4 總結 67

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指導教授

傅尹坤

審核日期

2024-8-12

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