论文部分内容阅读
为制备相互贯通Al_2O_3/Al复合材料,采用有机泡沫浸渍法和浇注成型法制备SiO_2陶瓷,真空消失模铸造法将铝浸入泡沫陶瓷中、将SiO_2陶瓷埋入Al粉分别获得SiO_2/Al复合材料,对复合材料进行高温热处理。考察硼酸添加剂对SiO_2陶瓷性能和硼酸、温度对原位反应的影响,以及复合材料的组织演化。结果表明,硼酸的添加有利于SiO_2陶瓷致密度与抗弯强度的提高,并对原位反应有促进作用。随温度升高,SiO_2与Al之间的反应层厚度急剧增加。SiO_2泡沫陶瓷和Al原位反应生成Al_2O_3与Si,生成的Al_2O_3骨架由颗粒状Al_2O_3及连续网状Al_2O_3构成,保持了SiO_2泡沫骨架的原有结构;反应生成的Si进入到Al基体中形成了Al-Si合金。
In order to prepare the interpenetrating Al 2 O 3 / Al composites, SiO 2 ceramics were prepared by impregnation method of organic foam and casting method, the aluminum was immersed into the foam ceramics by vacuum lost foam casting, the SiO 2 / Al composites were embedded in Al powders, The composite material for high temperature heat treatment. The effects of boric acid additives on the properties of SiO 2 ceramics and the influence of boric acid and temperature on in-situ reaction, and the microstructure evolution of the composites were investigated. The results show that the addition of boric acid is conducive to the increase of the density and flexural strength of SiO 2 ceramics, and promotes the in situ reaction. With the increase of temperature, the thickness of the reaction layer between SiO 2 and Al dramatically increases. SiO 2 foam ceramic and Al react in situ to form Al 2 O 3 and Si. The formed Al 2 O 3 framework consists of granular Al 2 O 3 and continuous reticular Al 2 O 3, maintaining the original structure of the SiO 2 foam skeleton. The Si generated by the reaction enters the Al matrix to form Al -Si alloy.