Pyrolytic carbon (PyC) interphase is a vital constituent of Cf/SiC composite and a key factor influencing mechanical properties of materials. PyC interphases with different microstructures have different intrinsic properties and performances

which would be beneficial to adjusting the mechanical properties of C

f

/SiC composites. To precisely control texture type of the PyC interphase

9 groups of PyC interphases with low

medium

and high textures were designed and prepared in this study. Utilizing the DETCHEM software

the pyrolysis components and their contents of the precursor gas source (methane) under the 9 sets of different chemical vapor deposition (CVD) parameters were calculated

and the key parameter R' that determines the texture type of PyC interphase was identified. When R' of

the pyrolysis component of methane is ≥ 22

it tends to deposite a low-texture PyC interphase; when R' ≤ 8.1

a high-texture PyC interphase is favored; when R' falls between 8.1 and 22

a medium-texture PyC interphase is formed. Furthermore

the CVD parameter range for different texture types of PyC interphases

PyC texture phase diagram are obtained

and growth models for different texture types of PyC interphases are constructed.