Threshold pressure for infiltration in mica-ceramic particle/aluminum composite.
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概要
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Wettability of ceramic reinforcements with molten metals plays a vital role in the quality of metal matrix composites (MMCs) fabricated through liquid processing: the poor wettability causes non-infiltrated defects to remain in pressure cast MMCs with a low applied pressure. Threshold pressure for infiltration is one of the promising methods to evaluate wettability, since the reinforcement itself in MMCs can be utilized in this method. The mica-ceramic particles which had been classified into three sizes (L, M, S) were supplied to measure the threshold pressure for molten aluminum infiltration. Pressure infiltrations to the particle preforms were performed at 998K in vacuum or air atmosphere. The threshold pressures for molten aluminum infiltration were found to be 80.9 (L), 77.8 (M) and 159kPa (S) in vacuum, and 96.9 (L), 96.1 (M) and 162kPa (S) in air atmosphere. The lower threshold pressures in vacuum can be ascribed to the better wettability. Non-infiltrated defects with a meniscus configuration were observed in the vicinity of a contact point of two particles. However, flat defects appeared between quasi-tangential planes in MMCs using L-size particle preforms, and aggregate defects were observed in S-size preforms. Modelling the defect with a meniscus configuration to estimate the defect size, the relation between the threshold pressure and the wettability can be derived from the work done by an applied pressure balancing the interfacial energy changes. The contact angle of mica-ceramics with molten aluminum in vacuum is calculated to be approximately 2.39rad which is obtained from the threshold pressure into the M-size particle preforms with less flat or aggregate defects. Hence, the relation between the threshold pressure and the contact angle depends on a configuration of non-infiltrated defects.
- 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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