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題 名 | SiC<p>/A356鋁基複合材料鑄造方法與機械性質關係之研究=The Relationships between the Casting Methods and Mechanical Properties of SiC<p>/A356 Al-Matrix Composites |
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作 者 | 楊榮顯; 張子欽; | 書刊名 | 鑄工 |
卷 期 | 24:2=97 1998.06[民87.06] |
頁 次 | 頁12-21 |
分類號 | 472.5 |
關鍵詞 |
SiC /A356複合材料 ; 鑄造方法; 機械性質; 樹枝狀晶; 推擠; SiC/A356 composites ; Casting method; Mechanical properties; Dendrite; Pushing; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究係探討以濕砂模、 CO �紡狺峈鷵敯珛奶ㄕP鑄造方法所澆注之 12 % SiC<p>/ A356 顆粒型複合材料與其機械性質間之關係。 製作過程係以 A356 鋁合金為基材 ,碳化矽( SiC )粒子為強化材。首先將碳化矽( SiC )粒子經過預熱後利用自製之加料 系統,添加至鋁合金熔液中並予以攪拌,使其均勻分散至 A356 鋁合金基地內。實驗結果發 現,在同樣澆注溫度 993K 下,使用金屬模鑄造可以得到較高之抗拉強度( 176.01 MPa ) ,其次為濕砂模( 121.15MPa )及 CO �紡牷] 112.52MPa )。另外鑄件之硬度值方面,金 屬模、濕砂模、CO �紡狺妣�依序為 94.7Hv、77.2Hv、71.8Hv。其原因可由金相顯微結構觀 察得知, 當使用濕砂模及 CO �紡珖犮悕顜N卻速率較慢,使得 SiC 顆粒有時間被樹枝狀晶 推擠而聚集在一起,且其樹枝狀晶臂間距離( DAS )較大所致。 |
英文摘要 | The primary purpose of this research is to investigate the effect of green sand mold, CO �� mold and permanent mold on the microstructure and mechanical properties of 12wt% SiC<p> /A356 composites. Commercially A356 alloy were selected as the matrix for the composites. The reinforcement particulates are high purity silicon carbide with an average diameter of 80 μ m. Processing of the composites, which consists of mixing preheated SiC particulates with molten A356 alloy, melt stirring and composites casting, The result showed that for all three casting method employed, the ultimate tensilt strength and the Vickers's hardness by using pemanent mold (176.01MPa, Hv94.7) is higher than that of using green mold (121.15MPa, Hv77.9) and CO �� mold (112.52MPa, Hv71.8) at the same casting conditions. One of the main factors is the cooling rate of green sand mold or CO �� mold slower than permanent mold, at a microscale level, clustering is observed because the reinforcement particles have been pushed out by dendrite and dendrite arm space (DAS) is increase. |
本系統中英文摘要資訊取自各篇刊載內容。