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。;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.
