CAJ | 학술논문

采用凝胶固相反应法制备SiC陶瓷基复合材料EBC涂层用Ba0.75Sr0.25Al2Si2O8粉体，并以SiC陶瓷片为基体材料初步评价了BSAS涂层的抗氧化能力。通过DSC/TG确定了凝胶前驱体的热分解情况；利用XRD、SEM、粒度和热膨胀系数的测定对合成粉体进行了表征；对该粉体的抗氧化性能进行了初步评价。结果表明，1200℃下成功制备颗粒中位径3.9μm、分散均匀的BSAS粉体；粉体室温至1200℃的热膨胀系数为5.02×10-6 K-1，与SiC陶瓷有很好的热胀匹配；该涂层可在1300℃、大气环境下保持均匀无开裂，与基体结合紧密，可以基本满足现阶段国内航空用SiC陶瓷基复合材料抗氧化的要求。
채용응효고상반응법제비SiC도자기복합재료EBC도층용Ba0.75Sr0.25Al2Si2O8분체，병이SiC도자편위기체재료초보평개료BSAS도층적항양화능력。통과DSC/TG학정료응효전구체적열분해정황；이용XRD、SEM、립도화열팽창계수적측정대합성분체진행료표정；대해분체적항양화성능진행료초보평개。결과표명，1200℃하성공제비과립중위경3.9μm、분산균균적BSAS분체；분체실온지1200℃적열팽창계수위5.02×10-6 K-1，여SiC도자유흔호적열창필배；해도층가재1300℃、대기배경하보지균균무개렬，여기체결합긴밀，가이기본만족현계단국내항공용SiC도자기복합재료항양화적요구。
In this paper, barium strontium alu-minum silicate powders, used for environmental barrier coatings on SiC ceramic matrix composites, are prepared by the gel-solid reaction method. DSC/TG thermodynam-ics is used to analyze the thermal decomposition of the precursor. The XRD, SEM, the particle size distribution and the thermal expansion of the BSAS powders are inves-tigated, and its oxidation resistance is evaluated primarily. The results show that uniformly dispersed BSAS powders with a diameter of 3.9μm can be prepared at the tempera-ture of 1200℃;the thermal expansion of the BSAS pow-ders is determined as 5.02×10-6 K-1 from room temperature to 1200℃, which matches with the thermal expansion of SiC ceramics very well;the coating will maitain uniform and no-cracking till 1300℃in air, and it combines with the substrate closely. The coating materials meet with the oxi-dation resistance requirements of the SiC ceramic matrix composites for current domestic aeronautic application.