耐高溫陶瓷砂芯的基礎研究

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Title:	耐高溫陶瓷砂芯的基礎研究
Authors:	呂育儒;Lu, Yu-Ju
Contributors:	機械工程學系
Keywords:	陶瓷砂芯;脫蠟鑄造;彎曲強度;纖維增韌;鎳金屬粉末增韌;ceramic cores;lost-wax casting;flexural strength;nickel powder toughening
Date:	2019-08-19
Issue Date:	2019-09-03 16:39:31 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究探討不同製做砂芯方式、不同耐火料顆粒大小、不同燒結溫度(與)與持溫時間(2hr、4hr與8hr)以及添加不同添加物對於燒結後陶瓷砂芯物理性質與機械性質的影響。從耐火料粉末預拌中加入碳酸鈉(1wt%)與氯化鉀(1wt%)三點彎曲強度的強化效果為最佳。以此為參考組，改變選用的耐火料顆粒大小(安德烈森公式、粗顆粒及細顆粒)與燒結溫度(及)，當所選用的顆粒越細(細顆粒)、燒結溫度越高()時，有最佳的三點彎曲強度9.66MPa。在加入0.5wt%氧化鋁短纖維作為強化、增韌，最大燒結陶瓷彎曲彎曲強度提升至21.1MPa，氧化鋁短纖維添加量再增加的話，則會增加試片的孔洞率與密度及降低試片燒結陶瓷的彎曲強度。在試片中放入銅線作為陶瓷/金屬複相強化，加入銅線的試片燒結陶瓷彎曲強度可達15.22MPa。在陶瓷粉末中加入氧化鋁粉(10wt%)以及鎳粉(10wt%)，燒結後陶瓷彎曲強度分別也來到了18.7MPa與17.6MPa。最後，探討陶瓷殺新的熱衝擊性、可行性，藉由第一階段的彎曲強度測試，第二階段的落球測試，來檢驗砂芯的強度與崩散性，發現試片燒結溫度在的崩散性表現較來得好。;This study aims to investigate the effects of different processes, different particle sizes, different temperature of sintering processes and adding different potential reinforcement materials in the ceramic core. When ceramic powder was added with 1wt% sodium carbonate and 1wt% potassium chloride, the sintered ceramic sample obtained high flexural strength of 7.74MPa. Effects of particle sizes (base on the Andreasen Eq.), sintering processing parameters on the flexural strength of sintered samples were studied. Experimental results found that using the fine particle (size #100) and sintering temperature at for 4 hours could yield high flexural strength. The aluminum oxide fiber, aluminum oxide powder, nickel powder, and copper wire were further added in the ceramic powder to see the reinforcement effect. Experimental results indicated that the flexural strength of adding varying reinforced material could produce 15.2MPan in adding copper wire, 17.6MPa in adding nickel powders, and 18.7MPa in adding aluminum powder. A highest flexural strength of 21.1 MPa was measured when 0.5wt% aluminum oxide fiber was added in the ceramic sample. Increasing aluminum oxide fiber content increase the porosity of sintered ceramic to also decrease the bulk density and flexural strength. Last but not least, ceramic cores were prepared for hot pouring test in the lost-wax casting process. The result showed that the ceramic specimens that sintered at for 2 hours got better collapsibility than those sintered at for 4 hours.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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