Influence of processing parameters on the threshold pressure of infiltration in alumina fiber/aluminum composite system.
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概要
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Although fiber arrangement in preforms does not affect the interfacial energies nor contact angle in a given composite system, it affects the threshold pressure of infiltration into fiber preforms remarkably. The processing parameters, such as pressurizing rate, pressure holding at the maximum applied pressure and molten metal temperature, affect the apparent wettability, consequently they also affect the threshold pressure. In this study, δ-alumina fiber/molten aluminum composite system was selected to in vestigate the influence of such processing parameters on the threshold pressure of infiltration. Pressurizing rate in infiltrations was changed from 0.20kPa/s to 16kPa/s, pressure holding at the maximum applied pressure for 300s was also performed. The pressurizing rate and pressure holding at the maximum applied pressure do not affect the threshold pressure into alumina fiber preforms with quasi-planar random arrangement. It is experimentally approved that the threshold pressure obtained by extrapolation of infiltration distance and applied pressure agrees with the one obtained by the pressure drop based on Blake-Kozeny's equation. The influence of molten aluminum temperature on the threshold pressure which was obtained by the pressure drop, was studied with the pressurizing rate of 2.4kPa/s. The threshold pressure decreases from 259kPa to 162kPa with molten aluminum temperature increased in the range of 943K and 1163K.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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