Chromium Alloy Member Coating to Prevent Cell Stack Layer Separation
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Solution Overview
Problem
Current cell stack devices face durability issues due to chromium oxide growth and separation of the covering layer from the base member, leading to a decrease in anchor effect and potential separation of the covering layer from the base member during operation.
Innovation Solution
An alloy member with a base member containing chromium, anchor portions with manganese oxides, and a covering layer with low-equilibrium oxygen pressure elements, such as manganese, is used to improve durability by inhibiting chromium oxide oxidation and maintaining the anchor effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a covering layer is applied to inhibit chromium volatilization, then chromium loss is reduced, but chromium oxide grows and causes covering layer separation
Solution Approach 1:
The patent applies a preliminary protective action by forming a covering layer before chromium oxide growth occurs. The covering layer is applied to the base member surface in advance to prevent chromium volatilization during subsequent high-temperature operation, addressing the problem before it escalates into covering layer separation
Solution Approach 2:
The patent introduces an intermediate protective layer composed of specific ceramic materials (alumina, silica, zirconia, or their combinations) that acts as a mediator between the chromium-containing base member and the oxidizing environment. This intermediate layer prevents direct oxidation of chromium while maintaining covering layer adhesion
2Object-affected harmful factors
If chromium oxide is allowed to form for protection, then oxidation resistance improves, but anchor effect decreases due to rounded shape
Solution Approach 1:
The patent changes the chemical composition parameters of the protective layer by specifying ceramic materials containing alumina, silica, zirconia, or their combinations with controlled content ratios. This parameter change allows the layer to provide oxidation resistance while maintaining physical properties that preserve the anchor effect
Solution Approach 2:
The patent employs composite ceramic materials combining multiple oxides (alumina, silica, zirconia) in specific ratios to create a protective layer that simultaneously provides oxidation resistance and maintains mechanical integrity for anchor effect, rather than using a single material
3Reliability
If the covering layer is made thin for better adhesion, then separation is reduced, but chromium protection is insufficient
Solution Approach 1:
The patent utilizes porous or partially porous ceramic materials (alumina, silica, zirconia) in the covering layer that can provide effective chromium protection at reduced thickness. The porous structure allows for better adhesion while maintaining protective function through high surface area and tortuous diffusion paths
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 solution effectively reduces the separation of the covering layer from the base member, enhancing the durability of the cell stack device by maintaining the anchor effect and preventing chromium oxide oxidation, thus improving the overall performance and longevity of the device.
Implementation Method 1
chromium oxide grows greatly as a result of the oxidation of the base member that surrounds the chromium oxide embedded in the recesses progressing during the operation of the cell stack device
Implementation Method 2
a covering layer that is connected to the anchor portion and contains a low-equilibrium oxygen pressure element whose equilibrium oxygen pressure is lower than that of chromium
Data Source
AI summary
An alloy member includes a base member that includes a recess in a surface of the base member and is constituted by an alloy material containing chromium, an anchor portion is disposed in the recess and contains an oxide containing manganese and a covering layer is connected to the anchor portion and contains a low-equilibrium oxygen pressure element whose equilibrium oxygen pressure is lower than that of chromium.