Automated preparation method of a SiCf/SiC composite flame tube

A method for the preparation of a silicon carbide ceramic (SiCf/SiC) matrix composite flame tube, comprising the steps of:

• 1) preparing an interface layer for a SiC fiber by a chemical vapor infiltration process, and obtaining the SiC fiber having a continuous interface layer;
• 2) laying a prepreg unidirectional tape on the SiC fiber having the continuous interface layer obtained in step 1) and winding the SiC fiber having the continuous interface layer obtained in step 1) to form and obtain a preform of a net size molding;
• 3) performing densification on the preform obtained in step 2) by adopting a reactive melt infiltration (RMI) process and a chemical vapor infiltration process in sequence until the mass ratio of a SiC matrix formed by the chemical vapor infiltration process to a SiC matrix formed by the reactive melt infiltration process is 1:1;
• 4) preparing an environmental barrier coating on a surface of the preform obtained in step 3), wherein a thickness of the environmental barrier coating is between 60 μm to 150 μm;
• and
• 5) preparing a thermal barrier coating on the surface of the preform obtained in step 4), thereby obtaining the SiCf/SiC composite flame tube, wherein a thickness of the thermal barrier coating is between 100 μm to 150 μm.