摘要
以Al2O3、Y2O3（质量比为2∶3）为烧结助剂,在氮气氛或氩气氛中、1 900~1 970℃3、0 MPa下热压制备SiC陶瓷。根据Archimedes原理测量烧结体的体积密度和显气孔率;采用XRD、SEM（EDS）及瞬态热导率测试仪分别对材料的物相、显微结构和热导率进行表征。研究了烧结温度、烧结气氛和烧结助剂含量对材料烧结性能和热导率的影响。结果表明,当烧结助剂质量分数为10%,获得SiC致密体（气孔率〈0.30%）,热导率高达182.50 W/（m.K）;随着烧结助剂的质量分数降至6%,材料的致密度和热导率皆明显下降;在氩气氛中SiC与Al2O3、Y2O3具有更好的润湿性。
The SiC ceramics has been prepared by the hot pressing of 30 MPa with Al2O3 and Y2O3（weight ratio of 2∶3） as sintering aids under the nitraogen or argon atmosphere at 1 900~1 970 ℃.The densification and the open porosity has been measured by Archimedes method.The phase,microstructure and the thermal conductivity have been characterized by using XRD,SEM（EDS） and the thermal conductivity tester respectively.The effects of the sintering temperature,sintering atmosphere and the thermal conductivity have been investigated.The results showed that the dense SiC ceramic with the porosity less than 0.30% and the thermal conductivity up to 182.50 W/（m·K） could be obtained when the amount of sintering aids was 10%.The densification and the thermal conductivity of the SiC cermic were decreased obviously with the amount of sintering aids decreased to 6%.In the argon atmosphere,the aids of Al2O3-Y2O3 had better wettability with SiC matrix.
出处
《压电与声光》
CSCD
北大核心
2011年第2期295-298,共4页
Piezoelectrics & Acoustooptics
基金
江苏省高校自然科学基金资助项目(03KLB.430047)
