摘要
以电熔白刚玉、SiC粉、α-Al2O3微粉、Al粉和SiO2微粉为主要原料,以有机硅树脂作结合剂,制备了Al2O3-SiC-Al复合材料。借助差热分析、XRD、SEM等方法研究了SiO2微粉加入量(分别为0、2%、4%、6%)对分别于300℃、500℃、800℃、1100℃、1300℃和1600℃保温3h处理后试样的烧结性能、物相组成和显微结构等的影响。结果表明:随着SiO2微粉加入量的增加,试样的强度逐渐升高,体积密度增大,显气孔率降低,并在SiO2加入量为4%时试样的物理性能达到最好;加入的SiO2微粉不仅能降低Al与周围空气中氧的反应,且与Al反应生成的Si能改善Al与SiC的润湿性,提高材料的结合能力。
Al2O3 -SiC -Al specimens were prepared using white fused corundum, SiC powder, α-Al2O3 micro powder, A1 powder, and ultra fine SiO2 as starting materials, and silicone resin as binder. The effects of ultra fine SiO2 on the sintering, phase composition and microstructure of the specimens treated at 300 ℃,500 ℃, 800℃,1 100 ℃,1 300 ℃,1 600 ℃ for 3 h respectively were investigated by XRD,TG -DSC and SEM. The results show that with the increase of ultra, fine SiO2 addition,the strength and bulk density increase, and apparent porosity decreases, and the specimens had the best physical properties when addition of ultra fine SiO2 was 4%. The added SiO2 can not only inhibit the reaction of AI with oxygen in the air, but also react with Al generating Si, which improves the wetting properties of AI and SiC, and bonding strength of specimens.
出处
《耐火材料》
EI
CAS
北大核心
2007年第4期263-266,共4页
Refractories
