Application of Reaction Sintered SiC-B4C Ceramic Materials

Reaction sintered silicon carbide (RBSiC) is a process in which liquid silicon infiltrates into a carbon-containing body at high temperature, and reacts with carbon to form silicon carbide, so that the body can be sintered. The preparation of silicon carbide by the reaction sintering process inherits the excellent properties of silicon carbide ceramics, and the reaction sintering has the advantages of simple process, short sintering time, low sintering temperature, net size sintering, etc. Structural ceramics for industrial applications have broad application prospects. Since the hardness of boron carbide material is higher than that of silicon carbide, using silicon carbide as the matrix and boron carbide particles as the dispersed phase can improve the hardness of silicon carbide by reaction sintering, and also improve the strength of the ceramic material by reaction sintering silicon carbide. The research on the introduction of boron carbide into the reaction sintered silicon carbide to prepare the composite material is an innovative exploration, which provides a technical basis for enhancing the performance of the reaction sintered silicon carbide ceramic material, thereby promoting the wider application of the reaction sintered silicon carbide ceramic material.

Since the mechanical properties such as hardness and strength of reaction sintered silicon carbide cannot meet the needs of some special applications, in order to improve its hardness, boron carbide particles are introduced into the reaction sintered silicon carbide material.

Compared with other preparation processes of silicon carbide ceramic materials, reaction sintered silicon carbide has the following characteristics:
①The reaction temperature is low. The reaction temperature only needs to be several tens of degrees higher than the infiltrating agent, which is hundreds of degrees lower than other sintering temperatures.

②Suitable for the preparation of large-sized and complex-shaped products. Since there are many forming methods for china, and the sintering process does not require pressure, the size of the product is only limited by the size of the sintering furnace, and the complexity of its shape is determined by the forming process.

③ The dimensional change during sample processing is small ( <0.1%) and the product is almost completely dense. Product processing time is short.

④No need for special and expensive production equipment
Reaction sintered SiC-B, C composite ceramic materials not only have excellent high temperature oxidation resistance, corrosion resistance, wear resistance and thermal shock resistance, but also have excellent technological properties that are easy to obtain net size and complex morphology components. SiC-B, C ceramic materials have more extensive applications, such as for industrial nozzles, pump seals and hot extrusion dies, light armor for helicopters, anti-vests, sealing rings for engine combustion chambers, jet mill liner, high temperature Heating elements, heat exchangers, pipe liners for conveying aggressive liquids, etc.