CAJ | 학술논문

采用水热电泳沉积法在SiC-C/C复合材料表面制备方石英型磷酸铝和莫来石的复相（C-AlPO4-莫来石）抗氧化涂层。借助X射线衍射、扫描电子显微镜和等温静态氧化实验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。研究了水热温度对C-AlPO4-莫来石涂层显微结构的影响,分析了复合涂层在1773K下的氧化行为。结果表明：353~413K范围内,当水热温度为393K时制备的涂层致密均匀。C-AlPO4-莫来石复合涂层具有较好的抗氧化性能,在1773K氧化348h后失重率仅为1.45%,氧化失重速率稳定在0.33mg/cm2·h的极低水平。复合涂层在1773K下的氧化能力下降主要是由于长时间氧化后偏磷酸盐和硅酸盐玻璃层不能及时有效的填补涂层中的缺陷,涂层试样在高温下产生了较多贯穿性孔洞。
채용수열전영침적법재SiC-C/C복합재료표면제비방석영형린산려화막래석적복상（C-AlPO4-막래석）항양화도층。차조X사선연사、소묘전자현미경화등온정태양화실험대복합도층적정상조성、현미결구화항양화성능진행료표정여측시。연구료수열온도대C-AlPO4-막래석도층현미결구적영향,분석료복합도층재1773K하적양화행위。결과표명：353~413K범위내,당수열온도위393K시제비적도층치밀균균。C-AlPO4-막래석복합도층구유교호적항양화성능,재1773K양화348h후실중솔부위1.45%,양화실중속솔은정재0.33mg/cm2·h적겁저수평。복합도층재1773K하적양화능력하강주요시유우장시간양화후편린산염화규산염파리층불능급시유효적전보도층중적결함,도층시양재고온하산생료교다관천성공동。
A C-A1PO4-mullite anti-oxidation coating was prepared on SiC pre-coated C/C composites by novel hydrotbermal electrophoretic deposition. The phase compositions, microstructures and anti-oxidation properties of the as-prepared multi-coatings were characterized by XRD, SEM and isothermal oxidation test. The influence of hydrothermal temperature on the microstructure was investigated. Results show that the dense and homoge- neous of the C A1PO4-mullite coating was achieved when the hydrothermal temperature reaches 393K. The as- prepared coatings exhibit excellent anti-oxidation property, which could effectively protect C/C composites from oxidation at 1773K in air for 348h with a weight loss of 1. 45%, the corresponding weight loss rate is only 0.33mg/(cm2·h). The anti-oxidation capability decrease of the coating at 1773K is due to the generation of cross-holes in the coating, which can not be self-cured by the metaphosphate and silicate glass layer after long time of oxidation.