Method for preparing recrystallized silica carbide porous ceramic with gas-solid reaction method

Abstract

The invention discloses a method for preparing recrystallized silica carbide porous ceramic with the gas-solid reaction method. The method includes the following steps that 1) SiO powder is put into the bottom of a crucible, mixed powder of 70 wt%-95 wt% of silicon carbide and 5 wt%-30 wt% of nano-carbon black is subjected to compression molding forming to form a green ware body according to the mass percent, the green ware body is put into the middle of the crucible, the crucible is put into a multifunctional sintering furnace, argon is introduced, the temperature is kept for 1 hour to 3 hours at the temperature of 1,650 DEG C to 1,800 DEG C, a gas-solid reaction is carried out, and a pre-sintering body is obtained; 2) the pre-sintering body is put into an induction sintering furnace, the temperature is increased to 1,900 DEG C to 2,100 DEG C in the argon atmosphere, the product is recrystallized for 1 hour to 3 hours, and the porous SiO ceramic can be obtained. The silicon carbide porous ceramic prepared with the method can be widely applied to the fields of a diesel-vehicle tail-gas particulate matter filter or a catalyst carrier or the like.

Description

technical field [0001] The invention relates to a method for preparing recrystallized silicon carbide porous ceramics combined with a gas-solid reaction method, which is suitable for various filter separators, catalyst carriers, sound-absorbing materials, biomedical materials, and the like. Background technique [0002] In recent years, diesel vehicles have developed rapidly by virtue of their advantages in economy, power and greenhouse gas emissions. However, the exhaust particulate matter emission pollution of diesel vehicles has become a bottleneck factor restricting its further development. A particulate filter (DPF) is currently recognized as one of the most effective after-treatment technologies. The DPF adopts high-temperature resistant materials with a specific structure to trap particulate matter in the exhaust gas, and regenerates the filter in a timely manner, thereby reducing particulate matter emissions. At present, the materials used in DPF are mainly cordier...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high sintering temperature and high cost of the existing recrystallized silicon carbide. Considering that none of the current preparation methods of recrystallized silicon carbide involves a gas-solid reaction process, a combination of gas-solid reaction method is provided. Method for Recrystallizing Silicon Carbide Porous Ceramics

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