CAJ | 학술논문

采用脉冲电弧放电法在 SiC-C/C 复合材料表面制备方石英型磷酸铝(C-AlPO4)抗氧化涂层.借助X射线衍射(XRD)、扫描电子显微镜(SEM)和等温静态氧化实验对涂层的晶相组成、显微结构和抗氧化性能进行了表征与测试.研究了脉冲电压对C-AlPO4涂层显微结构的影响,分析了 C-AlPO4涂层在1773 K下的氧化行为.结果表明,330~420 V 范围内,当脉冲电压为390 V 时制备的涂层致密均匀；C-AlPO4涂层具有较好的抗氧化性能,在1773 K氧化156 h后失重率仅为0．83％；C-AlPO4涂层在1773 K 下的氧化能力下降主要是由于长时间氧化后偏磷酸盐玻璃层不能及时有效地填补涂层中的缺陷,涂层在高温下产生了较多贯穿性孔洞所致的.
채용맥충전호방전법재 SiC-C/C 복합재료표면제비방석영형린산려(C-AlPO4)항양화도층.차조X사선연사(XRD)、소묘전자현미경(SEM)화등온정태양화실험대도층적정상조성、현미결구화항양화성능진행료표정여측시.연구료맥충전압대C-AlPO4도층현미결구적영향,분석료 C-AlPO4도층재1773 K하적양화행위.결과표명,330~420 V 범위내,당맥충전압위390 V 시제비적도층치밀균균；C-AlPO4도층구유교호적항양화성능,재1773 K양화156 h후실중솔부위0．83％；C-AlPO4도층재1773 K 하적양화능력하강주요시유우장시간양화후편린산염파리층불능급시유효지전보도층중적결함,도층재고온하산생료교다관천성공동소치적.
A C-AlPO4 anti-oxidation coating was prepared on SiC pre-coated C/C composites by novel pulse arc discharge.The phase compositions,microstructures and anti-oxidation properties of the as-prepared coatings were characterized by XRD,SEM and isothermal oxidation tests.The influence of pulse voltage on the micro-structure was investigated.Results show that the dense and homogeneous of the C-AlPO4 coating was achieved when the pulse voltage reaches 390 V.The as-prepared coatings exhibit excellent anti-oxidation property,which could effectively protect C/C composites from oxidation at 1 773 K in air for 156 h with a weight loss of 0.83%. The anti-oxidation capability decrease of the coating at 1 773 K was due to the generation of cross-holes in the coating,which can not be self-cured by the metaphosphate glass layer after oxidation for a long time.