Abstract: The in situ reaction method was used to prepare SiC coating on 3-D carbon fiber braid (RB). XRD, SEM, isothermal oxidation-weight loss and non-isothermal TG were used to
study the oxidation process and oxidation reaction mechanism of SiC coating/3-D carbon fiber braid (CB). The results showed that coating was
coated symmetrically and combined well with every fiber of braid. The oxidation process of CB in isothermal condition was reaction-controlled
in the first step, gas diffusion and reaction-controlled in the second step. The oxidation process of CB in non-isothermal condition exhibited a
self-catalytic characteristic, the oxidation mechanism was random nucleation, the kinetic parameters were: lgA=10.299min^-1; E_a=156.29kJ·mol^-1.

Key words: in situ reaction method, 3-D carbon fiber braid, non-isothermal TG, oxidation kinetics and mechanism