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題 名 | 石墨顆粒強化型鋁基複合材料流動性之探討=A Study on the Fluidity of Al-matrix/Graphite Reinforcement Composites |
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作 者 | 胡瑞峰; 蔡秉傑; 張立人; | 書刊名 | 鑄造工程學刊 |
卷 期 | 30:4=123 2004.12[民93.12] |
頁 次 | 頁18-32 |
分類號 | 454.9 |
關鍵詞 | 鋁基石墨顆粒複合材料; 流動性; 石墨; 電腦輔助冷卻曲線分析; 鋁合金; Aluminum/graphite composite; Fluidity; A356.2; A413.1; A390.1; CA-CCA; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究主要目的係在探討製程參數和冶金參數對三種鋁基合金(A356.2、A413.1以及A390.1)添加石墨顆粒而形成強化型複合材料流動性之影響。採用 CO₂ 砂模法製作螺旋形流動性測試(Spiral fluidity test)砂模,以量測各種不同成分之複合材料流動性,並使用電腦輔助冷卻曲線分析方法(CA-CCA),估算複合材料在凝固過程釋放的潛熱值和凝固熱參數之變化,以分析其對複合材料流動性之影響。 研究結果顯示,材料流動性隨著石墨添加量之增加呈現先增後降趨勢,而影響流動性之石墨顆粒添加量有一臨界值,即添加石墨顆粒在 4wt.%以上時,流動性才有明顯降低現象。 CA-CCA之分析結果指出,三種鋁基石墨顆粒複合材料的凝固潛熱隨著石墨顆粒含量之增加而呈現降低趨勢,惟隨著石墨含量之增加,其凝固溫度未有明顯的改變,但總凝固時間卻是先增後降,因此造成石墨顆粒鋁基複合材料流動性呈現先增後降情形。 對螺旋形流動性測試鑄件之顯微組織觀察分析,發現在三種不同的鋁合金中添加石墨顆粒所形成的複合材料,其流動凝固模式的改變對其流動性之影響,存有極密切之關係。 |
英文摘要 | The purpose of this study is investigate the effect of process and metallurgical parameters on the A1-matrix graphite composites, which use three types of aluminum alloys A356.2, A413.1 and A390.1 as matrix alloys. The reinforcement material is the graphite particles (Gr.) with size of micrometer order. CO₂ sand mold method and the spiral fluidity test pattern are conducted to measure the fluidity of composites. The computer-aided cooling curve analysis (CA-CCA) method was used to evaluate the effects of solidification temperature and solidification time on the fluidity of the three types of aluminum composites. The latent heat change by the addition of graphite is also calculated by CA-CCA method. The measured data show that there exists significant influence on the fluidity of composites. The results of this research indicate that the fluidity of aluminum/graphite composites was firstly increased and then decreased with the increase of graphite. The analyses of CA-CCA reveal that the latent heat decreases but the solidification time firstly increases and then decreases with the increase of graphite for the composites, while the soldification temperature does not change with the amount of graphite added. Finally, the microstructure observations on the spiral fluidity test castings of compsites indicate that the fluidity was significantly affected by the flowing solidification modes among those aluminum/graphite composites. |
本系統中英文摘要資訊取自各篇刊載內容。