| Summary: | 碩士 === 國立臺灣海洋大學 === 機械與機電工程學系 === 103 === The result of this paper presents the result of finding the relationship the size of aluminum-fly ash composite (ALFA). ALFA is the product from fly ash and aluminum ADC10 reacting during electric power generation process in thermal power plant. Due to the cost of metal or cost of process, most of metal matrix composites are more expensive compared to fly ash. In this research, different sizes of fly ash were used to produce ALFA by die-casting, and the sizes of fly ash were distributed to four categories; 25 - 37μm, 37 - 53μm, 53 - 106μm, and 106μm and above. During the research, the result was obtained after 30 hours of chemical reaction of metal matrix composite was done, and 6% of fly ash was added with 2wt% of magnesium.
The result shows fly ash size that above 106μm are mostly covering ALFA, and the smaller size of fly ash has less ALFA. In addition, the smaller size of fly ash is, the more obvious clustering phenomenon is shown. According to mechanical property, hardness and elasticity are affected significantly by using the size of particles; by using the large particle can result in increasing hardness by 10.1% and tensile strength by 45.5%, and decreasing elongation by 0.4%. Furthermore, the smaller size of fly ash has smaller contact surface. Therefore, it has lower reaction rate with aluminum, which would result holes and defects.
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