摘要
采用循环氧化法对SiC/BN纳米复合陶瓷在1100℃和1300℃静态空气中的高温氧化行为进行了研究,研究结果表明在1100℃时,初期氧化时部分BN氧化成B2O3而挥发,产生较多的气孔,使其抗氧化性能降低。随着氧化反应的继续,氧化层(SiO2)的厚度增加,内部的BN不再继续氧化,只有SiC还可缓慢氧化。1300℃氧化时,由于SiC迅速氧化形成较为致密的氧化层,表面氧化膜均匀致密,并有晶相物在氧化膜中生成,可阻止内部的BN发生氧化,表现出较好的抗氧化性。
By means of XRD and SEM, the circular oxidation of SiC/BN nanocomposites in the static air was studied at the temperatures of 1100℃ and 1300℃ respectively.The results showed that the volatilization of B_2O_3,which is derived from the partial oxidation of BN at initial stage of 1100℃,could reduce the resistance of oxidation,and produce a lot of pores on the surface of the sample.With the further oxidization, the incrassation of oxide layer would protect the inner BN from oxidization.At 1300℃,the dense oxide layer produced by the rapid oxidation of SiC would prevent the further oxidation of BN,and the materials exhibited excellent resistance of oxidation.
出处
《河南科技大学学报（自然科学版）》
CAS
2005年第4期5-7,22,共4页
Journal of Henan University of Science And Technology:Natural Science
基金
河南省自然科学基金资助项目(0411053800)
关键词
纳米复合陶瓷
氧化
抗氧化能力
Nanocomposites
Circular oxidation
Oxidation resistance
