包埋工艺参数对碳/碳复合材料表面SiC涂层致密性的影响

Effect of Pack Parameters on Density of SiC Coating on Carbon/Carbon Composites Surface

摘要: 采用包埋法在碳/碳(C/C)复合材料表面制备出不同致密度的SiC涂层,用正交试验法系统研究了包埋温度(A)、包埋时间(B)、烧结助剂Ⅰ含量(C)、烧结助剂Ⅱ含量(D)、硅含量(E)等工艺参数对SiC涂层抗氧化性能(用抗氧化性能表征涂层的致密性)的影响.结果表明:研究的包埋工艺参数对SiC涂层抗氧化性能(致密性)影响的显著性从大到小依次为A,C,E,D,B;在A1B1C1D1E1工艺条件下所得的SiC涂层最疏松;通过改进参数,在A3B2C4D2E4工艺条件下所得的SiC涂层最致密,该涂层可在1 500 ℃空气中提供10 h以上的抗氧化保护.

Abstract: In order to study the effect of pack parameters including pack temperature(A),pack time(B),additiveⅠ content (C),additive Ⅱ content (D) and silicon content(E) on the density of SiC coating,SiC coating was prepared under different pack conditions as designed by orthogonal experiment on the surface of carbon/carbon(C/C) composites.The results show that the influencing levels of the five pack parameters were as followings: A,C,E,D,B.In comparision with the porous SiC coating prepared under the conditions of A1B1C1D1E1,the SiC coating prepared under the conditions of A3B2C4D2E4 had a denser microstructure which could protect C/C composites from oxidation for more than 10 h at 1 500 ℃ in air.