| Summary: | 碩士 === 華梵大學 === 機電工程學系 === 101 === This paper mainly investigates the hot pressing of the aluminum bronze matrix alumina composites using the powders of copper, tin, nickel, iron, aluminum, alumina, etc. The mechanical properties of porosities, hardness, bending strengths, and microstructure for the aluminum bronze matrix composites were studied.
The experiment results showed that the aluminum bronze matrix composites with the increase of the amount of iron and nickel resulted a higher open porosity and a lower close porosity and presented a larger hardness of the matrix. However, the alumina composites contain a too more amount of iron and nickel powders would cause a lower bending strength due to forming some weaker bonding among the iron, nickel, copper, aluminum under this hot pressing. Besides, adding alumina into the matrix displayed a poorer hardness and bending strength. This may be attributed to a higher porosity. Furthermore, the aluminum bronze matrix composites obtained after resin infiltration showed a smaller number of open porosity and a larger number of close porosity, which causes a higher hardness, bending strength and strain energy.
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