Composite Gasket for MCFC Manifold Sealing

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Solution Overview

Problem

Conventional ceramic gaskets used in fuel cell systems, particularly in Molten Carbonate Fuel Cells (MCFCs), suffer from electrolyte migration due to high electrolyte absorption and low mechanical strength, leading to performance degradation and reduced lifespan.

Innovation Solution

A composite gasket design featuring three layers of fibrous ceramic materials with varying compressibilities, including a third layer with sintered materials and a reinforcing structure, is used to enhance mechanical properties and prevent electrolyte migration, while maintaining electrical isolation and dimensional stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional ceramic gaskets are used for sealing in fuel cell systems, then sealing function is provided, but electrolyte migration occurs due to high electrolyte absorption and low mechanical strength

Engineering Contradiction:

Improvesealing performanceVSAvoidelectrolyte migration

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies composite materials by combining organic binder materials with inorganic ceramic particles to create a gasket that integrates the sealing capabilities of ceramics with the mechanical strength and electrolyte resistance of organic polymers. This composite structure resolves the contradiction by providing both reliable sealing and reduced electrolyte migration.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the material parameters by adjusting the composition ratio of organic binder to inorganic ceramic particles, selecting specific ceramic types with low electrolyte absorption, and optimizing sintering conditions. These parameter changes enable the gasket to simultaneously achieve low electrolyte absorption and high mechanical strength.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If conventional ceramic gaskets are used, then high temperature resistance is achieved, but mechanical strength is insufficient leading to crushing and deformation

Engineering Contradiction:

Improvehigh temperature resistanceVSAvoidcompressive strength

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

The composite structure combines heat-resistant ceramic particles with mechanically strong organic binders, creating a material that maintains both high temperature resistance and adequate mechanical strength. The organic component prevents crushing while the ceramic provides thermal stability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent extracts the heat resistance function to the inorganic ceramic particles while assigning the mechanical strength function to the organic binder material. This functional separation allows each component to optimize its specific property without compromising the other.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If conventional gasket materials are used, then sealing capability is provided, but handling and assembly become difficult due to sagging and low structural stability

Engineering Contradiction:

Improvesealing capabilityVSAvoidhandling and assembly

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The composite material provides structural rigidity through the inorganic ceramic framework while maintaining sealing capability through the organic binder. This combination eliminates sagging during handling while preserving the conformability needed for effective sealing.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The gasket is pre-formed with a stable structure that prevents sagging during assembly operations. The reinforced composite structure maintains its shape during handling and installation, eliminating the need for careful manipulation required by conventional soft gaskets.

Inventive Principle:

Principle #10Preliminary action

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 composite gasket effectively reduces electrolyte migration, improves compressive strength, and maintains a gas-tight seal, thereby extending the lifespan and performance of MCFCs by minimizing electrolyte loss and absorption.

Implementation Method 1

The third layer of fibrous ceramic material is positioned between and engaged with the first layer of fibrous ceramic material and the second layer of fibrous ceramic material. The third compressibility is less than the first compressibility and less than the second compressibility.

Methodology Applied

Scientific EffectSintering: Sintering

Implementation Method 2

Methodology Applied

Scientific EffectCompressive strength:

Data Source

PatentUS9005837B2Gasket for fuel cell system manifold seal

Publication Date: 2015.04.14 FUELCELL ENERGY INC

AI summary

A gasket for a manifold seal for a fuel cell system includes a first layer of fibrous ceramic material having a first compressibility, a second layer of fibrous ceramic material having a second compressibility and a third layer of fibrous ceramic material having third compressibility. The third layer of fibrous ceramic material is positioned between and engaged with the first layer of fibrous ceramic material and the second layer of fibrous ceramic material. The third compressibility is less than the first compressibility and less than the second compressibility.