3results about How to "High ceramic yield" patented technology

The invention provides a SiBCN precursor for a prepreg, the prepreg, a composite material and a preparation method of the SiBCN precursor for the prepreg, and the preparation method comprises the following steps: taking dichloromethylvinylsilane, boron trichloride and disilazane as raw materials, and preparing the SiBCN precursor for the prepreg through a one-step method; the homogeneous impregnation slurry is prepared by blending the SiBCN precursor and the ceramic powder at a high temperature, so that the components of the prepreg can be efficiently regulated and controlled, and the prepreg prepared by taking the impregnation slurry as an impregnation matrix can be used for preparing a special silicon resin-based composite material and a special ceramic-based composite material. A resin-based composite material and a ceramic-based composite material which are prepared by taking the prepreg prepared by the method as a raw material have excellent ablation performance and can be used for preparing a novel ablation composite material.

This invention discloses a silicon carbide fiber precursor polycarbosilane and its preparation method, belonging to the field of polycarbosilane preparation technology. The preparation method of the silicon carbide fiber precursor polycarbosilane includes the following steps: Step 1: Preparing a Grignard reagent; Step 2: Adding an organic alkane to tetrahydrofuran, stirring and mixing, then slowly adding it to the Grignard reagent, stirring and reacting; after the reaction is complete, heating to room temperature, adding a composite organic auxiliary agent, stirring and reacting; after the reaction is complete, quenching the reaction, separating the liquids, washing, and drying to obtain a prepolymer; Step 3: After vacuum distillation of the prepolymer, transferring it to a reaction vessel, heating and polymerizing it under argon atmosphere; after the reaction is complete, adding it to toluene, dissolving, filtering, precipitating, and drying to obtain the silicon carbide fiber precursor polycarbosilane. The polycarbosilane prepared by the above method has excellent thermal stability and high-temperature mechanical properties.

This invention relates to the field of ceramic additives, specifically to an additive and its preparation process for inhibiting high-temperature cracking in ultra-high temperature ceramic precursors. This additive addresses the problem that traditional additives cannot effectively inhibit high-temperature cracking in ceramic precursors. By combining functional nanoparticles, functional filler slurry, and nanofillers, this additive achieves a four-fold synergistic crack inhibition mechanism during the pyrolysis of ultra-high temperature ceramic precursors: physical support framework, chemical reaction compensation for shrinkage, organic phase decomposition to relieve gas stress, and in-situ generation of nanocrystals to pin cracks. This additive exhibits good compatibility with various ceramic precursor systems, requires only a small dosage, and can significantly eliminate macroscopic cracks and reduce volume shrinkage, while simultaneously improving ceramic yield and optimizing microstructure.