Resilient Mounting Mat for Ceramic Monolith Vibration Protection
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Solution Overview
Problem
Ceramic monoliths used in pollution control devices are fragile and susceptible to vibration and thermal expansion differences with metal housings, leading to potential damage and exhaust gas bypassing.
Innovation Solution
A non-woven mat comprising a blend of magnesium aluminum silicate glass fibers and amorphous refractory ceramic fibers, bio-soluble ceramic fibers, or heat-treated silica fibers, which provides enhanced resiliency and thermal stability to securely mount the monolithic elements within the metal housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic monoliths are used in pollution control devices, then pollution control function is achieved, but the monoliths are fragile and susceptible to vibration and shock damage
Solution Approach 1:
The patent applies beforehand cushioning by introducing a mounting mat made of resilient material between the ceramic monolith and metal housing. This mat is specifically designed to cushion the monolith against vibration and shock damage before such damage can occur, thereby protecting the fragile ceramic structure while maintaining pollution control functionality.
Solution Approach 2:
The mounting mat serves as an intermediary element between the ceramic monolith and metal housing. This intermediate resilient material layer absorbs mechanical stresses and prevents direct transmission of vibration and shock to the monolith, solving the contradiction between achieving pollution control function and protecting against mechanical damage.
2Reliability
If mounting mat is used to secure monolith, then protection from vibration and thermal expansion is achieved, but exhaust gases may pass between monolith and housing
Solution Approach 1:
The mounting mat is designed as a flexible resilient material that can deform and conform to maintain sealing contact. This flexible structure allows the mat to adapt to thermal expansion and vibration while continuously blocking exhaust gas pathways, preventing harmful gas bypassing while maintaining protective functions.
Solution Approach 2:
The mounting mat employs dynamic properties through its resilient nature, allowing it to flex and adapt during thermal cycling and vibration. This dynamic behavior enables the mat to maintain both protective cushioning and sealing functions simultaneously, preventing exhaust gas leakage while accommodating dimensional changes.
3Reliability
If resilient mounting mat is used to hold monolith, then thermal expansion compensation is achieved, but mat must withstand high temperatures
Solution Approach 1:
The mounting mat utilizes composite material construction combining organic and inorganic components. This composite structure provides both the required resilient properties for thermal expansion compensation and the high-temperature stability necessary to withstand exhaust gas temperatures, resolving the contradiction between mechanical flexibility and thermal resistance.
Solution Approach 2:
The mounting mat is designed with specific parameter optimizations including its compositional makeup and dimensional characteristics. These parameter changes enable the mat to maintain structural integrity and resilient properties across the full temperature range, achieving both thermal expansion compensation and temperature capability simultaneously.
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 mat significantly increases the resiliency value after thermal cycles, ensuring the ceramic monoliths are securely held and preventing exhaust gas bypassing, thus enhancing the durability and performance of pollution control devices.
Implementation Method 1
mounting mats are disposed between the ceramic monolith and metal housing... Even though the metallic housing undergoes a smaller temperature change due to the insulating effect of the mat
Implementation Method 2
mounting mats are disposed between the ceramic monolith and metal housing. These mats exert sufficient pressure to hold the monolith in place over the desired temperature range
Data Source
Figure 1~2
AI summary
Non-woven mat including magnesium aluminum silicate glass fibers and amorphous refractory ceramic fibers, bio-soluble ceramic fibers, and/or heat-treated silica fibers. Embodiments of the nonwoven mat surprisingly have a Resiliency Value after three thermal cycles from 25°C to 700°C/400°C of the Real Condition Fixture Test at least 1.1 times greater than the Resiliency Value of a comparable non-woven mat consisting of any individual type of fibers of the non-woven mat. The non-woven mats are useful, for example, in pollution control devices and other thermal insulation applications.