| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系 === 105 === 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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