As the demand for clean energy continues to grow, Solid Oxide Fuel Cell (SOFC) has attracted widespread attentions as an efficient and renewable energy storage device. However, the ferritic stainless steel (FSS) interconnectors used in SOFCs are prone to oxidative corrosion. Chromium elements can deposit onto the cathode at high temperatures, which can lead to cathode degradation due to chromium poisoning, impacting the durability and stability of the SOFC. To address these issues, researchers prepared several types of rare earth element-doped Co-Mn spinel layers on the exterior of FSS, aiming to enhance the oxidation resistance, corrosion resistance, and conductivity of the interconnectors. Based on the review and progresses of the influences of rare earth elements on the Co-Mn spinel protective coatings on FSS surfaces, the function mechanism of rare earth elements on the preparation and performance of the coatings is expounded, and the development trends of this field is prospected, aiming to provide new ideas and references for the preparation of protective coatings on the SOFC interconnector surfaces.
H13 steel is often used to manufacture hot working dies such as forging dies and injection molds. These dies are prone to wear, cracking and failure on the surface under the action of high temperature and pressure. Laser cladding is an effective method for surface modification and remanufacturing of the H13 steel dies. However, due to the characteristics of rapid cooling and heating in laser cladding, the temperature gradient and cooling rate in the forming process are too large, which often leads to excessive thermal stress and cracking during the process, especially in multi-layer cladding. Laser cladding of multi-layer 316L/H13+20%WC composite coatings was carried out on the surface of H13 steel. The microstructure, element diffusion behavior and wear properties of the cladding layers were studied. Through design of the cladding layer materials, good adhesion performance with the substrate, high toughness of the bottom layers and high hardness and wear resistance of the top layer has been obtained to reduce the cracking tendency and enhance the comprehensive property of the cladding layers. Finally, defect free multi-layer functional composite coatings have been obtained.
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