Chromium Alloy Coating Anchor Effect
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cell stack devices experience separation of the coating layer from the base member during operation, which affects the performance and longevity of the fuel cells.
Innovation Solution
An alloy member with a base material containing chromium, embedded ceramic portions in recesses, and a coating layer connected to these portions, where the average length of the embedded portions is longer than the straight line lengths, enhancing the anchor effect and preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a coating layer is applied to the base member to inhibit chromium volatilization, then chromium loss is reduced, but the coating layer separates from the base member during operation
Solution Approach 1:
Recesses are formed in the base member surface before applying the coating layer, and embedded portions are placed in these recesses. This preliminary preparation creates mechanical interlocking features that prevent coating layer separation during subsequent operation, while the coating layer itself remains intact to prevent chromium volatilization
Solution Approach 2:
The embedded portions are designed with curved or non-linear shapes where the actual length exceeds the straight line length by 10% or more. This curvature increases the surface area and mechanical interlocking effect between the coating layer and base member, preventing separation while maintaining chromium protection
2Loss of substance
If the coating layer is made thicker to improve chromium protection, then chromium loss is reduced, but the coating layer becomes more prone to separation
Solution Approach 1:
The coating layer is segmented through the embedded portions that protrude into it, creating multiple anchoring points. This segmentation allows the coating layer to be thinner while maintaining strong bonding, as the embedded portions provide mechanical interlocking that distributes stress and prevents delamination
Solution Approach 2:
The structure combines the base member material (containing chromium), the embedded portions (different material), and the coating layer into a composite system. This composite structure leverages the strengths of each material while the embedded portions act as transition elements that enhance bonding between the base member and coating layer, preventing separation even with thinner coating layers
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 inhibits the separation of the coating layer from the base member, improving the durability and performance of the cell stack device by increasing the bonding strength and anchor effect.
Implementation Method 1
a plurality of embedded portions that are respectively disposed in the plurality of recesses and are constituted by a ceramic material, and a coating layer that covers at least a portion of the surface of the base member and is connected to the plurality of embedded portions
Data Source
AI summary
An alloy member includes a base member that includes a plurality of recesses in a surface and is constituted by an alloy material containing chromium, a plurality of embedded portions that are respectively disposed in the plurality of recesses, and a coating layer that covers the base member and is connected to the plurality of embedded portions. An average value of actual lengths of line segments of the plurality of embedded portions is longer than an average value of straight lengths of straight lines of the plurality of embedded portions in a cross-section of the base member along a thickness direction of the base member. The average value of the actual lengths is 1.10 times or more the average value of the lengths of the straight lines.