Chromium Retention Layers for Components of Fuel Cell Systems

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This patent describes a method for applying a gas-tight chromium retention (protection) layer to components used in high-temperature fuel cells, specifically Solid Oxide Fuel Cells (SOFCs). The method involves treating components made of chromium-containing alloys, where their aluminum-containing surfaces are heated so that a special aluminum oxide (Al2O3) layer forms. This layer greatly reduces chromium evaporation from the material, which would otherwise degrade fuel cell performance. Notably, any defects in the layer can self-heal during the fuel cell's operation, enhancing durability.

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• High-temperature solid oxide fuel cell (SOFC) systems, especially for power generation in stationary or mobile applications.
• Manufacture of critical SOFC balance-of-plant components such as heat exchangers, pipes, pumps, and housing units to improve lifetime and reduce maintenance.
• Production of robust fuel cell stacks with improved long-term efficiency for distributed energy, backup power, or grid stabilization.
• Other high-temperature applications where chromium-containing alloys are used and chromium loss or evaporation must be minimized, such as certain industrial reactors or exhaust systems.

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly reduces chromium evaporation from fuel cell components, preventing catalyst poisoning and maintaining high fuel cell efficiency.
• Enhances the durability and operational lifespan of SOFC stacks and components, reducing maintenance costs and increasing reliability.
• The protection layer is self-healing, improving resilience to thermal cycling and mechanical damage that occur during normal operation.
• Allows effective coating of parts with complex geometry, ensuring full protection for critical elements within the fuel cell system.
• Enables the use of more cost-effective or readily available materials by improving their stability in harsh, high-temperature environments.

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Patent Abstract

The invention relates to a method for producing chromium retention layers for components of high-temperature fuel cells (SOFCs) made of chromium-containing alloys. The aluminum-containing surface of the component is subjected to elevated temperatures such that a gas-tight chromium retention layer is formed. Said layer effectively prevents chromium from evaporating from the basic material. Defects in the layer heal automatically during operation of the fuel cell.