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选用A ,B ,C和D四个炭 /炭复合材料试样进行抗氧化涂层厚度的光学测量研究。其中试样A和B孔隙度相同 ,均为 15 .85 % ,对其涂覆粒径分别为 1μm和 10 μm的B4 C涂层 ;试样C和D孔隙度分别为 13.5 2 %和 16 .78% ,对其均涂覆粒径为 10 μm的B4 C涂层。通过光学金相测量分析其涂层厚度。结果表明 ,当试样孔隙度相同时 ,涂层材料粒度越小 ,其涂层厚度越厚 ;当抗氧化涂层材料粒度相同时 ,试样孔隙度越大 ,涂层厚度越厚。同时 ,在抗氧化涂层厚度计算过程中 ,对试样组织内部没渗透抗氧化涂层的孔隙需进行图像处理 ,以期得到涂层厚度的准确值。
A, B, C and D four carbon / carbon composite samples were selected for optical measurement of anti-oxidation coating thickness. The samples A and B had the same porosity of 15.85%, respectively, and were coated with B4C coatings with particle sizes of 1μm and 10μm, respectively. The porosity of samples C and D were 13.5% and 16%, respectively. 78% coated with a B4 C coating of 10 μm particle size. The coating thickness was analyzed by optical metallography. The results show that when the sample porosity is the same, the smaller the particle size of the coating material, the thicker the coating thickness. When the anti-oxidation coating material has the same particle size, the larger the porosity of the sample is, the thicker the coating thickness. Meanwhile, during the calculation of the thickness of the anti-oxidation coating, the pores which are not permeable to the anti-oxidation coating inside the sample structure need to be processed in order to obtain the exact value of the coating thickness.