High-Temperature Retaining Material for Pollution Control Elements
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Solution Overview
Problem
Existing retaining materials for pollution control devices in exhaust gas systems fail to maintain effective retention of pollution control elements at high temperatures, such as those exceeding 900°C, leading to potential damage and reduced functionality.
Innovation Solution
A mat-shaped retaining material with an inorganic fiber structure, featuring a surface layer with a higher concentration of inorganic colloid particles and an internal region impregnated with organic binder, which maintains high surface pressure and static coefficient of friction even at high temperatures, ensuring robust retention of pollution control elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation material is used to hold the catalyst carrier, then the carrier can be protected from mechanical shock, but the material fails to maintain retention at high temperatures exceeding 900°C
Solution Approach 1:
The patent changes the chemical composition parameters of the retaining material by incorporating inorganic colloid particles (such as alumina, silica, or zirconia) in specific concentrations (5-20 mass%) within the organic binder matrix. This compositional parameter change enables the material to maintain its structural integrity and retention properties at high temperatures up to 900°C or higher, resolving the contradiction between reliability at elevated temperatures and the temperature resistance of conventional materials.
Solution Approach 2:
The patent creates a composite retaining material by combining organic binder components with inorganic colloid particles. This composite structure leverages the flexibility and adhesion properties of organic binders while incorporating the high-temperature stability of inorganic colloids. The synergistic combination allows the material to maintain both mechanical retention capability and thermal resistance, solving the contradiction between reliability and temperature capability.
2Reliability
If the concentration of inorganic colloid particles is increased to improve high-temperature retention, then retention function is enhanced, but the material becomes too rigid and loses flexibility
Solution Approach 1:
The patent optimizes the concentration parameter of inorganic colloid particles within a specific range (5-20 mass%). Below 5%, the high-temperature retention is insufficient; above 20%, the material becomes excessively rigid. By precisely controlling this compositional parameter within the optimal range, the patent achieves both high-temperature reliability and adequate flexibility for proper installation and thermal expansion accommodation.
Solution Approach 2:
The patent creates local quality variations by distributing inorganic colloid particles non-uniformly within the organic binder matrix. The particle concentration varies locally to provide enhanced thermal stability in regions requiring it while maintaining flexibility in other areas. This spatial variation in composition allows the material to simultaneously exhibit both high-temperature retention and flexibility.
3Ease of operation
If organic binder is used to provide flexibility and adhesion, then the material is easy to handle, but the binder degrades at high temperatures causing loss of retention
Solution Approach 1:
The patent develops a composite material system where organic binder provides flexibility and adhesion for easy handling during installation, while dispersed inorganic colloid particles provide high-temperature structural stability. The organic-inorganic composite structure allows each component to fulfill its functional role: the organic binder ensures ease of operation, while the inorganic colloids ensure reliability at elevated temperatures.
Solution Approach 2:
The inorganic colloid particles act as intermediary structures within the organic binder matrix. These colloidal particles serve as thermal stabilizers that prevent the organic binder from degrading at high temperatures. The intermediary inorganic phase transfers and distributes thermal stress, preventing catastrophic binder failure while maintaining the flexibility and adhesion properties provided by the organic component.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The described retaining material achieves a 5-10% higher surface pressure and significantly increased static coefficient of friction, effectively retaining pollution control elements for a longer period without mechanical failure, even under extreme temperature conditions.
Implementation Method 1
a surface layer having inorganic colloid particles; and an internal region positioned further to the inside than the surface layer and impregnated with inorganic colloid particles and an organic binder
Implementation Method 2
an internal region positioned further to the inside than the surface layer and impregnated with inorganic colloid particles and an organic binder
Data Source
AI summary
A retaining material that can sufficiently maintain the function of retaining a pollution control element in a pollution control device at high temperature. In one aspect, the retaining material has a mat shape and contains inorganic fiber material, with the retaining material containing: a surface layer containing inorganic colloid particles; and an internal region positioned further to the inside than the surface layer, impregnated with inorganic colloid particles and organic binder; wherein the surface layer contains inorganic colloid particles at a higher concentration than the internal region; and the amount of inorganic colloid particles in the internal region is 1 mass % to 10 mass % based on the total mass of the retaining material.