Fabrication of Metal/Ceramic In situ Composites by Directed Oxidation of Aluminum Melt

铝熔体定向氧化制备金属/陶瓷原位复合材料

基本信息

批准号：
03555154
负责人：
KAGAWA Yutaka
金额：
$ 4.16万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555154/
关键词：
Directed Oxidation Aluminum Melt Al_2O_3 Al alloy Composites In situ Processing Microstructure of Composite Growth Mechanism Optimum Processing Variables Directed Nitridation 溶融アルミニウム合金 in situプロセス生成モデルシミュレーション熱的特性力学的特性 A

项目摘要

Directed melt oxidation is an attractive process for fabrication of dense, near net shaped metal/ceramic composite materials. An experimental and theoretical study was conducted to study the growth mechanism of the Al_2O_3/Al alloy composites. The oxidation of Al-Mg-Si alloys was carried out at temperatures ranging from 900 to 1700K under dry air gar atmosphere. The optimum processing variables were obtained experimentally and microstructure of the obtained composite was compared with the processing condition. The typical composite structure was three-dimensionally interconnected Al_2O_3 phase (70 vol%) and residual aluminum alloy phase (30 vol%). The growth process was divided into three characteristic stages. Stage I corresponded to formation of porous spinel layr above the liquid aluminum alloy. After stage I, bulk Al_2O_3/Al alloy composite formed and the growth rate showed the maximum value. During stage III, the oxidation rate constantly decreased. The decreased oxidation rates were due to increased melt viscosity, higher diffusion distances from aluminum and depletion of aluminum alloy reservoir. The modeling and analysis have been done on the growth process and the result reasonably agrees with the experimental result. The application of this process to Al_2O_3/Al alloy matrix reinforced with SiC fiber or SiC particle was also carried out.

定向熔融氧化是制造密集的，近乎净形的金属/陶瓷复合材料的有吸引力的过程。进行了一项实验和理论研究，以研究Al_2O_3/Al合金复合材料的生长机理。 Al-MG-SI合金的氧化是在干燥空气GAR气氛下的温度从900至1700K的温度进行的。实验获得了最佳的处理变量，并将获得的复合材料的微观结构与处理条件进行了比较。典型的复合结构是三维相互连接的AL_2O_3相（70 vol％）和残留的铝合金相（30 vol％）。增长过程分为三个特征阶段。 I阶段对应于液体铝合金上方的多孔尖晶石层的形成。第I阶段后，形成的批量AL_2O_3/AL合金复合材料，增长率显示出最大值。在第三阶段，氧化速率不断降低。氧化速率的降低是由于熔体粘度的增加，铝合金储层的扩散距离较高。建模和分析已经在增长过程中进行，结果与实验结果相吻合。还将此过程应用于用SIC纤维或SIC粒子加固的AL_2O_3/AL合金基质。