What is the car three-way catalytic gasket
automobile three-way catalytic gasket is a sealing element installed in the three-way catalytic converter, mainly used to seal the connection between the three-way catalytic converter and the exhaust pipe to prevent gas leakage. The ternary catalytic gasket is usually made of an expansion gasket or a wire mesh pad, and the material includes expanded mica, aluminum silicate fiber and adhesive. The gasket expands when heated and partially contracts when cooled, thus ensuring the sealing effect .
The role of three-way catalytic gasket
sealing effect : to prevent gas leakage and ensure the normal operation of the three-way catalytic converter.
thermal insulation : to prevent the carrier due to vibration, thermal deformation and other reasons and damage.
fixing action : fixing the carrier to prevent it from moving at high temperatures.
Structure and working principle of three-way catalytic converter
The ternary catalytic converter is generally composed of a shell, a damping layer, a carrier and a catalyst coating. The housing is made of stainless steel, the damping layer is usually composed of expansion gaskets or wire mesh pads, the carrier is usually honeycomb ceramic material, and the catalyst coating contains rare metals such as platinum, rhodium and palladium. When the engine exhaust passes through the three-way catalytic converter, CO, HC and NOx undergo REDOX reaction at high temperature and are converted into harmless gases CO2, H2O and N2, thus purifying the exhaust gas .
The materials of automobile three-way catalytic gasket mainly include expanded mica, aluminum silicate fiber and adhesive.
The three-way catalytic gasket is usually made of expanded mica and aluminum silicate fiber plus adhesive. This material expands in volume when heated and partially shrinks when cooled. It can expand the gap between the sealed shell and the carrier and play the role of vibration reduction and sealing . In addition, the gasket also has the characteristics of high temperature and fire resistance, can maintain stability in high temperature environment, prevent the oxide peel off and carrier clogging .
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