Hole plugging material for low-expansion wall flow honeycomb ceramic and plugging method thereof

Abstract

The invention discloses a hole plugging material for low-expansion wall flow honeycomb ceramic. A base material of the hole plugging material consists of the following raw materials in percentage by mass: 40-70 percent of a low-expansion material, 10-35 percent of a heating volume expansion agent, 10-30 percent a mineralizer and 10-20 percent an inorganic plasticizer; and the hole plugging material comprises 6-10 percent of an organic additive and 18-35 percent of water relative to the mass percentage of the base material. Moreover, the invention further discloses a method for plugging wall flow honeycomb ceramic by using the hole plugging material. The hole plugging material has a controllable and adjustable expansion coefficient and can be matched with the expansion coefficient of a honeycomb ceramic material, and the bonding strength of the hole plugging material and a honeycomb ceramic hole wall is enhanced greatly, so that thermal impact resistance is effectively improved, and the airtightness of a plugged duct of the honeycomb ceramic is ensured. Moreover, a plugging method is easy and practicable, has high production efficiency and superior performance, and has contribution to popularization and use.

Description

technical field [0001] The invention relates to the technical field of ceramic membrane separation, in particular to a plugging material and a plugging method for wall-flow honeycomb ceramics. Background technique [0002] Wall-flow honeycomb ceramics is a kind of honeycomb ceramics in which the inlet of the filter channel and the adjacent outlet are blocked alternately. When the air flow enters from one end of the wall-flow honeycomb ceramic filter channel to the other end, the gas can be forced to pass through the wall of the filter channel, so as to achieve the purpose of filtering particles. Wall-flow honeycomb ceramics have the advantages of high temperature resistance, high filtration efficiency, good corrosion resistance, and good thermal shock resistance, so they are widely used in diesel particulate filters (DPF for short) and high-temperature flue gas filtration, etc., making high-temperature gas The purpose of intercepting high-temperature dust particles is achie...

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Problems solved by technology

[0004] However, the expansion coefficient of the plugging material used in the prior art cannot be adjusted, and it is difficult to match the expansion coefficient of the honeycomb ceramic carrier. There are common problems such as poor thermal shock resistance and unreliable bonding, and it is easy to fall off when there is a high-temperature gas impact. , cannot ensure that the blocked pores have effective sealing

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