工業發展至今，伴隨著汽機油所帶來的全球暖化、石油危機等所帶來的經濟問題也日漸加重，因此為降低汽機車產業上能量損耗，便尋求各類輕金屬做為汽機車各部件之材料。
機車引擎工作溫度約在150~250℃，且活塞與汽缸套之間劇烈地往復運動作用，其主要與汽缸套對磨的為活塞上之活塞環，活塞環須密封燃燒室內的可燃混合氣體以及刮除汽缸上多餘的機油，且活塞環材質通常為較硬之鋼材或球墨鑄鐵，因此汽缸套材料需有較好之高溫熱機性質及耐磨耗性質。
但一般鋁合金的耐磨耗性、高溫強度、熱膨脹係數等性質上不具有特殊優勢。但若在鋁合金中加入高量之矽元素並輔以高溫熱處理，則可同時大幅改善以上問題。在傳統製程中，過共晶Al-Si 合金會有粗大初晶矽，造成其延展性下降，難以進行後續加工與成型。所以改以合金設計與先進之「噴覆成型」製程製作出具有等軸細小初晶矽的高矽鋁合金。
本研究利用背向式擠型加工噴覆成型之高矽鋁合金，並探討不同高溫熱處理時間對於材料顯微組織之影響、高溫機械性質、磨耗性質，晶粒、矽顆粒、高溫拉伸試驗及磨耗試驗之結果之影響

With Industrial development, The economic Crisis that oil Shortage and the Global warming cause is getting worse, In order to reduce the energy problem ,we can start from replacing the motorcycle engine block material. Normally the material of traditional engine block is gray cast iron, the problem of cast iron is its weight, the more weight of engine block is, and the more energy has to be consumed. So we decide to use light metal to replace the gray cast iron as the material of engine block.

Motorcycle engine operated at 150 ℃~250℃ and piston rings move up and down reciprocally with the piston. The functions of a piston ring are to seal off the combustion pressure, to distribute and control the oil, to transfer heat, and to stabilize the piston. Therefore, the cylinder liner need excellence thermo-mechanical properties and wears properties.

In this study, we utilize the spray-forming process combined with post process such as backward extrusion and high temperature heat treatment to produced high Si-containing aluminum alloys test sample(AC9A-30Si and AZFM-30Si), Base on previous statement. 250℃tensile test and wear test(170℃) was employed to study the Thermo-mechanical properties and establish the wear mechanism of high Si-containing aluminum alloys at elevated temperature .

Beside the study of mechanical property and wear mechanism at elevated temperature, Also compare different post heat treatment parameter (Heat treatment Time) effect on mechanical and wear property . As a result we could established the optimum post process parameter for high Si-containing aluminum alloys engine block.

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