INFLUENCE OF METALLURGICAL PARAMETERS AND PROCESS PARAMETERS ON THE FLUIDITY OF AL/SICP COMPOSITES BY HORIZONTAL SQUEEZ
嚴偉峰、胡瑞峰
E-mail: 9126602@mail.dyu.edu.tw
ABSTRACT
THE AIM OF THIS STUDY WAS TO INVESTIGATE THE INFLUENCE OF PRESSURE PROCESS PARAMETERS, E.G., SICP CONTENT (0~20WT%), METAL MOLD TEMPERATURE, SQUEEZE PRESSURE (8~13MPA/79~132KG /CM2) AND CASTINGTHICKNESSES(REPRESENTING COOLING RATE) ON THE FLUIDITY OF THREE TYPES OF AL-MATRIX SICP COMPOSITES (A356/SICP, A413/SICP AND A390/SICP).THE EXPERIMENTAL RESULTS IN -DICATE THAT THE FLUIDITY OF THREE TYPES OFAL-MATRIX SICP COMPOSITES TEND TO DECREASE WITH THE INCREASE OF SICPCONTENT AND TEND TO INCREASE WITH THE INCREASE OF SQUEEZE
PRESSURE.WHE -N THE SICP CONTENT ADDED IS MORE THAN 5WT% FOR THE A356/SICP COMPOSITE, THE FLUIDITY WILL DECREASE. WHILE, THE SICP CONTENT ADDED IS MORE THAN 10WT% FOR THE A413/SICP AND A390/SICP COMPOSITE, THE FLUIDITY WILL DECREASE. IN ADDITION, COMPARED A356/SICP WITH A390/SICP COMP -OSITES AT DIFFERENT PRESSURES, THE FLUIDITY IS INCREASED WITH PRESSURE.
HOWEVER, THE PRESS URE AFFECTING ON FLUIDITY FOR A356/SICP OR A390/SICP COMPOSITES HAVE A THRESHOLD LIMIT VAL UE,ABOUT 10.4MPA/106KG/CM2. ABOVE THRESHOLD LIMIT VALUE, THE FLUIDITY ISNOT CLEARLY INCREA SED. IN ADDITION, THE FLUIDITY OF COMPOSITES IS ALSO INCREASED WITH THE INCREASE OF CASTING THICKNESS FOR ANY COMPOSION OF A356/SICP、A413/SICP AND A390/SICP
COMPOSITES. FURTHERMORE, THE MICROSTRUCTURE OBSERVATION AT DIFFERENT POSITIONS OF STRIP CASTING WERE PERFORMED TO CO -RRELATE THE SOLIDIFICATION MODES WITH THE FLUIDITY OF THREE TYPES OF AL-MATRIX SICP COMPO -SITES. COMPARED WITH THE ORIGINAL ALUMINUM MATRIX ALLOYS, THE SOLIDIFICATION MODES OF A35 -6/SICP ALLOYS DOES NOT CHANGE FOR ANY CONTENT OF SICP ADDED. BUT A413/SICP AND A390/SICP ALLOY IS CHANGE FOR ANY CONTENT SICP ADDED.THE STRUCTURE AT THE STRIP CASTING OF AL-MATRIX SICP COMPOSITES POURED AT HIGH MOLD TEMPERATURE OR UNDER HIGH SQUEEZE PRESSURE REVEALS FIN -E MICROSTRUCTURE.
Keywords : SQUEEZE CASTING, AL-MATRIX SICP COMPOSITES, FLUIDITY,COOLING RATE Table of Contents
第一章前言--P1 第二章文獻探討--P3 2.1 金屬基複合材料的製造方法--P4 2.2 擠壓鑄造--P6 2.2.1 製造過程與分類--P7 2.2.2 擠 壓鑄造的優點--P7 2.3 潤濕性--P8 2.3.1 強化材顆粒與熔液間之潤濕性--P9 2.3.2 溫度對界面潤濕性的影響--P9 2.3.3 合金元素 對潤濕性的影響--P10 2.4 壓力效應--P12 2.4.1 壓力對熱傳導性的影響--P12 2.4.2 壓力對健全度的影響--P12 2.4.3 壓力對相平 衡圖的影響--P12 2.4.4 壓力對偏析的影響--P16 2.5 流動性--P16 第三章實驗方法及步驟--P33 3.1 實驗設計--P33 3.1.1 流動性 測試--P33 3.1.2 複合材料之基材--P34 3.1.3 複合材料之強化材--P34 3.1.4 金屬模模溫--P34 3.1.5 油壓驅動壓力和鑄造壓 力--P34 3.2 實驗設備及裝置--P35 3.2.1 攪拌設備--P35 3.2.2 壓力鑄造設備--P35 3.2.3 長條型流動性測試金屬模--P35 3.3 複合 材料熔煉與處理--P36 3.3.1 備料--P36 3.3.2 預熱碳化矽顆粒--P36 3.3.3 熔煉--P36 3.3.4 攪拌器烘烤--P37 3.3.5 SiC顆粒之添加 與攪拌--P37 3.3.6 模具加熱和離型劑之噴覆--P37 3.4 流動性測試--P38 3.5 金相組織觀察與分析--P38 3.5.1 光學顯微鏡(OM) 觀察--P38 第四章結果與討論--P44 4.1 長條型金屬模流動性測試--P44 4.1.1 碳化矽添加量對複合材料流動性之影響--P44 4.1.2 鑄造壓力對複合材料流動性之影響--P46 4.1.3 流道厚度對複合材料流動性之影響--P47 4.1.4 模溫對複合材料流動性之 影響--P48 4.2 製程參數對流動凝固模式和流動性之影響--P49 4.2.1 添加SiCp對流動凝固模式和流動性之影響--P49 4.2.1.1 A356/SiCp流動凝固模式和流動性之關係--P49 4.2.1.2 A413/SiCp流動凝固模式和流動性之關係--P52 4.2.1.3 A390/SiCp流動 凝固模式和流動性之關係--P54 4.2.2 鑄造壓力對凝固模式和流動性之影響--P57 4.2.3 模具溫度對凝固模式和流動性之影 響--P59 4.2.4 流道厚度(冷卻速率)對凝固模式和流動性之影響--P61 第五章結論--P138 參考文獻--P140
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