The effect of pyrolytic carbon (PyC) thickness on the tensile property of mini T800 carbon fiber reinforced SiC matrix composites (C/SiC) was studied. PyC interphase was prepared by chemical vapor infiltration (CVI) process using C₃H₆–Ar as gas source, the PyC thickness was adjusted from 0 to 400 nm, and then the SiC matrix was prepared by CVI process using methyltrichlorosilane (MTS)–H₂–Ar as precursor and gas source. The results showed that the tensile strength of mini T800-C/SiC increased first and then decreased with the increase of the PyC thickness. When the thickness of PyC was 100 nm, the average strength reached the maximum value of 393 ± 70 MPa. The Weibull modulus increased from 2.0 to 8.06 with the increase of PyC thickness, and the larger the Weibull modulus, the smaller the dispersion, which indicated that the regulation of PyC thickness was conducive to improve tensile properties.

研究了热解碳（PyC）厚度对微型T800碳纤维增强SiC基复合材料（C / SiC）拉伸性能的影响。以C ₃ H ₆ -Ar为气源，通过化学气相渗透（CVI）工艺制备PyC相，将PyC厚度从0调整为400 nm，然后使用甲基三氯硅烷（MTS）通过CVI工艺制备SiC基体。高₂-Ar作为前驱物和气源。结果表明，随着PyC厚度的增加，mini T800-C / SiC的拉伸强度先升高后降低。当PyC的厚度为100nm时，平均强度达到最大值393±70MPa。威布尔模量随PyC厚度的增加而从2.0增加到8.06，威布尔模量越大，分散度越小，这表明PyC厚度的调节有利于改善拉伸性能。