Method for manufacturing soot filter

Abstract

The invention discloses a method for manufacturing a soot filter. The method comprises the following steps: preparing the following components by weight: 30-40 parts of talcum, 20-30 parts of aluminum hydroxide, 5-10 parts of kaoline, 10-20 parts of silicon oxide and 10-30 parts of mullite fibre; mixing the above materials, adding a pore-forming agent, a binding agent, a lubricant and a hydrosynthesis plasticity pug, molding the mixed materials to be blank bodies, and drying to obtain the finished product. As the mullite fibre is added, the soot filter with high porosity, high intensity, high temperature resistance and high thermal shock resistance can be obtained.

Description

technical field [0001] The invention relates to the technical field of diesel engine exhaust soot filters, in particular to a manufacturing method of the soot filter. Background technique [0002] Diesel engines have high horsepower, cheap oil, less oil, high low-speed torque, good fuel economy, and good reliability. However, the main problem of diesel engines is that the exhaust gas contains particulate matter. Currently, wall flow is mainly used to capture soot particles. Type soot filter, the material of the filter mainly includes cordierite and silicon carbide. When the soot particle filter reaches a certain amount of smoke load, it will increase the back pressure of the engine and needs to be regenerated. The key technology of the soot filter It is the selection of filter material and the regeneration of the filter. The structure and performance of the filter material have a great influence on the pressure loss, filtration efficiency, strength, and heat transfer of the...

AI Technical Summary

Problems solved by technology

Filter materials are required to have high filtration efficiency, low exhaust resistance, high mechanical strength and anti-vibration performance, and must also have high temperature oxidation resistance, thermal shock resistance and corrosion resistance, among which high filtration efficiency is secret. Exhaust resistance is a pair of contradictions. At present, there are mainly two filter materials, cordierite and silicon carbide, in the market. Cordierite has good thermal shock resistance, but its strength is low after reducing pressure loss, reducing wall thickness and increasing porosity. Due to the small thermal conductivity, it is easy to be partially burned or cracked, and the high temperature resistance is poor

Silicon carbide has high strength and high temperature corrosion resistance, but its thermal expansion coefficient is high, it is easy to crack, and its thermal shock resistance is relatively poor

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