Low-temperature welding process of high-pressure-resistant silicon carbide micro-reaction assembly

Abstract

The invention discloses a high-pressure-resistant silicon carbide micro-reaction assembly and a low-temperature welding process. The process is characterized in that tetraethyl orthosilicate, dimethyldiethoxysilane and trimethyl borate are dissolved in ethanol, silicon carbide powder is added into a mixed solution to be coated on the welding surface of a silicon carbide micro-reaction plate, low-temperature welding is carried out in a hot-pressing furnace after slurry coating, cooling is performed to 500 DEG C or below, reheating is performed to 1600 DEG C, heat preservation is performed for 1hour, and secondary cooling is performed to obtain the silicon carbide micro-reaction assembly with the welding thickness. According to the invention, the welding temperature is low, the requirementfor a high-temperature welding furnace is lowered, and the welding cost is reduced; the silicon carbide ceramic is low in softening degree, deformation is easy to control, the depth is easy to control, the welding yield of the silicon carbide micro-reaction assembly is increased, and the welding cost is reduced; the silicon carbide micro-reaction assembly obtained by welding through the process ishigh in bonding strength, and the withstand voltage can reach 60 BAR or above; and the binding phase is silicon carbide ceramic which is resistant to strong acid and strong alkali corrosion and can be applied to various harsh reaction conditions.

Description

technical field [0001] The invention relates to a low-temperature connection process for high-pressure silicon carbide micro-reaction components, in particular to a method capable of connecting silicon carbide ceramics at low temperature, which belongs to the field of engineering ceramics. Background technique [0002] As an important chemical process intensification equipment, the microreactor can make the chemical reaction proceed in the micron-scale space, fully improve the heat transfer and mass transfer efficiency, and then greatly improve the reaction conversion rate and selectivity, reduce the volume of the reactor, and improve the reaction process. The integration and safety of the chemical industry can achieve the production goal of energy saving and consumption reduction. [0003] In the field of fine chemical industry, many reactions have very strict requirements on temperature, and many media often have strong acid or strong alkali characteristics, and high press...

AI Technical Summary

Problems solved by technology

Although the temperature and pressure resistance can meet the requirements of use, during the welding process, the silicon carbide reaction plate is in a high-temperature softening state, and the thickness shrinkage is more than 0.5mm, the deformation is large, and the groove depth of the reactor is difficult to control.

The welding yield is low, therefore, it is urgent to find a method for low-temperature welding of silicon carbide micro-reaction components