Sintering method of wall-flow type honeycomb ceramic carrier

Abstract

The invention relates to a method for sintering a wall-flow honeycomb ceramic carrier, which is mainly used for trapping diesel engine exhaust particles. The wall-flow honeycomb ceramic carrier body is put into a kiln and vacuumized. When the temperature of the kiln rises to the set Keep warm after the value, fill the kiln with protective gas for sintering, keep warm after sintering, continue to raise the furnace temperature and sinter to the set value, then keep warm, continue to raise the furnace temperature to the set value, keep warm, cool down, and come out of the furnace. Advantages: First, the combination of furnace heating and heat preservation not only ensures the sintering quality of the honeycomb green body, but also ensures the ceramic strength after sintering; second, the furnace adopts protective gas protection firing process, which not only meets the The melting temperature required for silicon carbide recrystallization can also keep the silicon carbide recrystallization in a molten state for heat preservation and smelting, and finally form a high-strength recrystallized silicon carbide honeycomb ceramic collector.

Description

Technical field: [0001] The invention relates to a method for sintering a wall-flow honeycomb ceramic carrier, which is mainly used for collecting diesel exhaust particles and belongs to the field of ceramic carrier sintering and manufacturing. Background technique: [0002] Patent application number 200610008498.1, titled "Manufacturing method of nano low-temperature sintered high-purity silicon carbide honeycomb collector", the method adopts normal pressure sintering, the sintering temperature range is 1700-2100°C, and the holding time is 0.5-4.5 hours. Its shortcomings: First, because the background technology uses nano-silicon carbide or nano-silicon oxide as a sintering aid, not only cannot promote the formation of pure silicon carbide at high temperature, but also cannot produce practical wall-flow honeycomb ceramics in the test The second is that due to the lack of a specific control process for the sintering temperature, it is impossible to sinter in the range of 170...

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Problems solved by technology

Its shortcomings: First, because the background technology uses nano-silicon carbide or nano-silicon oxide as a sintering aid, not only cannot promote the formation of pure silicon carbide at high temperature, but also cannot produce practical wall-flow honeycomb ceramics in the test The second is that due to the lack of a specific control process for the sintering temperature, it is impossible to sinter in the range of 1700-2100 °C.

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