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Analysis of the Liquid State Fabrication Process of Aluminum Alloy Matrix Composites with Al_2O_3 Fiber of Powder

Al_2O_3纤维粉末铝合金基复合材料的液态制备过程分析

基本信息

批准号：
01550534
负责人：
MORI Nobuyuki
金额：
$ 1.86万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550534/
关键词：
Composites Alumina fiber Aluminum alloy Wettability Contact angle Infiltration process FRM Electroless plating 高圧鋳造法真空吸引法

项目摘要

To study the principles of the liquid state fabrication of metal matrix composites, the infiltration process of molten mital into Al_2O_3 fiber perform was investigated both experimentally and analytically. The influences of surface morphorogy of Al_2O_3, metal coating and moving rate of liquid, on the wettability of molten Al to Al_2O_3 was also measured. Firstly, the influences of surface morphology and porosity on the wettability of sintered Al_2O_3 powder or fiber substrates by molten Al was investigated by the sessile drop method. The apparent contact angles (rheta) of molten Al on sintered fiber substrate and lustrous sintered powder substrate were almost equal to those calculated by Cassie's equation, the rule of mixture for wettability ; rheta was calculated from the contact angle (rheta_1) on smooth transparent Al_2O_3 substrate and the surface porosity (fvs) which was evaluated from the bulk porosity (fv) of substrate. On the other hand, rheta on the lusterless sintered powde … More r substrate was much larger than that estimated from rheta_1 and fvs evaluated from fv. rheta on the lusterless substrate was accurately estimated from the surface porosity (fvs) measured by an image processing system. Secondly, the influences of thickness (delta) of coating layer and temperature on the wettability of molten Al on Ni ion plated Al_2O_3 was evaluated. Ni coating reduced the wetting angle from 90-110^<> to less than 10^<> when delta was larger than 0.1, 0.5 and 0.8mum at 973, 1073 and 1173K, respectively. Further, the advancing and receding wetting angle of moving liquid on Al_2O_3 were measured as a function of moving rate of the liquid front. Finally, the infiltration process of molten metal into Al_2O_3 fiber perform was analyzed by using D'Arcy's law on fluid flow in a porous media, with the consideration of surface tension and wettability of the molten metal. The experimental study on the infiltration of molten Pb and Al revealed the validity of the analysis with an assumption of a distribution of different sizes of pores in the perform. Less

为了研究液态制备金属基复合材料的原理，对熔融金属在Al_2O_3纤维中的渗透过程进行了实验和分析研究。测定了Al_2O_3表面形貌、金属镀层和液体移动速率对铝液对Al_2O_3润湿性的影响。首先，采用固滴法研究了表面形貌和孔隙率对烧结Al_2O_3粉末或纤维基底在熔融Al中的润湿性的影响。熔融铝在烧结纤维基材和有光泽烧结粉末基材上的视接触角（rheta）与混合润湿性规则Cassie方程计算的视接触角（rheta）基本相等；通过光滑透明Al_2O_3衬底上的接触角（rheta_1）和衬底的体积孔隙度（fv）计算表面孔隙度（rheta）。另一方面，无光泽烧结粉末上的rheta比由rheta_1和fv估算的fvs要大得多。通过图像处理系统测量表面孔隙率（fvs），准确估计无光泽衬底上的Rheta。其次，研究了涂层厚度（δ）和温度对铝液在Ni离子镀Al_2O_3表面润湿性的影响。在973、1073和1173K处，δ分别大于0.1、0.5和0.8mum时，Ni涂层使润湿角从90 ~ 110^<>减小到小于10^<>。进一步测定了运动液体在Al_2O_3上的进、退润湿角随液锋移动速率的变化规律。最后，利用多孔介质中流体流动的达西定律，考虑金属液的表面张力和润湿性，分析了金属液在Al_2O_3纤维中的渗透过程。对铅和铝熔液的渗透实验研究表明，在假设不同孔径分布的情况下，该分析是有效的。少