研究生: |
沈聲裕 |
---|---|
論文名稱: |
石墨/A390鋁基複合材料鑄件機械性質及耐磨耗性之研究 |
指導教授: | 邱弘興 |
學位類別: |
碩士 Master |
系所名稱: |
工業教育學系 Department of Industrial Education |
論文出版年: | 2000 |
畢業學年度: | 88 |
語文別: | 中文 |
論文頁數: | 46 |
中文關鍵詞: | 鋁合金 、複合材料 |
論文種類: | 學術論文 |
相關次數: | 點閱:177 下載:9 |
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本研究主要探討在不同的石墨添加量(3wt%、7wt%、10wt%)所製得之石墨/A390鋁基複合材料鑄件,經熱處理後,石墨添加量對A390鋁基複合材料鑄件機械性質及耐磨耗行為之影響。
由於石墨顆粒表面與鋁熔湯之潤濕性差,不易在高溫下將石墨顆粒直接加入鋁熔湯中,故本文係利用水合過程,使石墨顆粒表面披覆一均勻之銅鍍層,來改善石墨顆粒與母材之間的潤濕性。
實驗結果顯示,將石墨表面鍍上一層銅後,可將石墨加入鋁熔湯中,並利用液態攪拌方式所生成之強大剪力對流,可將石墨顆粒較均勻分佈於A390鋁合金基地中。
石墨/A390鋁基複合材料鑄件,隨著石墨量的增加,其硬度值與抗拉強度有下降的趨勢。
石墨/A390鋁基複合材料藉由石墨顆粒的釋放及石墨固體潤滑膜的形成,可阻止黏著現象與嚴重的犛溝,減緩母材表面之磨損,
且隨著石墨量之增加,耐磨耗性有提升的趨勢。
The main purpose of this research is to investigate the effects of graphite on mechanical properties and wear resistance of castings of Graphite /A390 Al-matrix composite by various amount of reinforcement (3wt%、7wt%、10wt%) after heat treatment.
According to the wettability between the surface of graphite and aluminum melt is poor, it is difficult to mix the graphite into aluminum melt directly. Thus, by using cementation process products a copper layer onto the surface of graphite in order to improve the wettability.
The experimental results show that can mix graphite into aluminum melt successfully after adding a copper layer on graphite surface. Additionally, the strong shear force by liquid stirring can spread graphite averagely into A390 Al-alloy basement.
In Graphite /A390 Al-matrix composites, under increasing quantity of graphite, the hardness tends to increase, the tensile strength tends to decrease ,and weight loss of wearing tends to decrease.
By the releasing of graphite and the forming of graphite solid lubrication, Graphite /A390 Al-matrix composites can prevent from sticking phenomenon and serious plough.
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