CAJ | 학술논문

采用脉冲电弧放电法在SiC-C／C复合材料表面制备硼化硅和硅化钼的复相（SiB6-M oSi2）抗氧化涂层．借助X射线衍射、扫描电子显微镜对复合涂层的晶相组成、显微结构和抗氧化性能进行了表征与测试．研究了不同晶相组成（m[MoSi2]／m[SiB6]＝ Cp）对SiB6-MoSi2涂层显微结构的影响．结果表明：当晶相组成 m[M oSi2]／m[SiB6]＝1∶4时，制备的涂层致密均匀，在1773 K氧化156 h后失重仅为2．12％，复合涂层氧化失效是由于长时间氧化后涂层挥发变薄，不能及时有效的愈合气相（CO和CO2）的逸出产生的氧化孔洞等缺陷导致的．
채용맥충전호방전법재SiC-C／C복합재료표면제비붕화규화규화목적복상（SiB6-M oSi2）항양화도층．차조X사선연사、소묘전자현미경대복합도층적정상조성、현미결구화항양화성능진행료표정여측시．연구료불동정상조성（m[MoSi2]／m[SiB6]＝ Cp）대SiB6-MoSi2도층현미결구적영향．결과표명：당정상조성 m[M oSi2]／m[SiB6]＝1∶4시，제비적도층치밀균균，재1773 K양화156 h후실중부위2．12％，복합도층양화실효시유우장시간양화후도층휘발변박，불능급시유효적유합기상（CO화CO2）적일출산생적양화공동등결함도치적．
A SiB6-MoSi2 anti-oxidation coating was prepared on SiC pre-coated C/C compos-ites by pluse arc discharge deposition .The phase compositions ,microstructures and anti-oxi-dation properties of the as-prepared multi-coatings were characterized by XRD ,SEM and iso-thermal oxidation test .The influence of phase composition on the microstructure was investi-gated .Results show that the dense and homogeneous of the SiB6-MoSi2 coating was achieved when the phase composition m[MoSi2 ]/m[SiB6 ]=1∶4 .The as-prepared coatings exhibit ex-cellent anti-oxidation property ,which could effectively protect C/C composites from oxida-tion at 1 773 K in air for 166 h with a weight loss of 2 .12 % .The anti-oxidation capability decrease of the coating is attributed to the generation of oxidation holes and microcracks w hich due to the volatilization of borosilicate glass layer and the escape of the gas phase (CO and CO2 ) .