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Si-WSi2 Coating Prepared by HDS

Details: Category: Tungsten's News; Published on Monday, 01 May 2023 12:27; Written by Caodan; Hits: 601

The mS values vs. exposure time of pure W and W-based alloys oxidized at 1000 temperature for 15 h imageThe mS values vs. exposure time of pure W and W-based alloys oxidized at 1000 temperature for 15 h image

Zhang et al. prepared Si-WSi₂ coatings on W substrates by hot-dip silicon-plating (HDS) technique. The HDS method involves placing a solid infiltration source into a corundum crucible under a high-temperature protective atmosphere, heating it until it is completely melted, and maintaining the temperature for a certain period of time. The processed sample is then slowly placed into the crucible and the coating is formed on the surface of the substrate by interpenetration between the substrate and the melt. This method is considered to be a cost-effective coating preparation method, which features short coating preparation time, high deposition temperature, uniform coating composition, smooth surface, and compact structure.

WSi2/β-SiC Nanocomposite Coating Prepared by CVD

Details: Category: Tungsten's News; Published on Monday, 01 May 2023 12:20; Written by Caodan; Hits: 606

The Cross-sectional morphologies of oxidized WSi2 coatings under different conditions image

The WSi₂/β-SiC nanocomposite coating were obtained by a two-step chemical vapor deposition (CVD) process. EPMA results showed that the carbide coatings consisted of a WC layer and a W₂C layer with corresponding thicknesses of 2 and 17 µm, respectively. The WSi₂ layer with a thickness of about 50 µm was then obtained by silicification at 1200 °C for 30 min.

Oxidation Mechanisms of W-Based Alloys

Details: Category: Tungsten's News; Published on Sunday, 30 April 2023 14:55; Written by Caodan; Hits: 594

Surface morphology of different alloys after HIP and SEM images of the alloys after oxidized at 1000 degree centigrade image

The oxidation mechanisms and failure mechanisms of W-based alloys indicate that the oxidation process can be divided into two distinct phases. The rate of oxide film formation and the stability of the structure are the key factors affecting the oxidation resistance of W-Cr alloys. the Si and Cr elements are easily oxidized to form a stable protective film. Therefore, the oxidation properties of W-Si-based alloys and W-Cr-based alloys have been extensively investigated.

Antioxidant Coating for W-Based Alloys

Details: Category: Tungsten's News; Published on Sunday, 30 April 2023 15:16; Written by Caodan; Hits: 562

Oxidation test curves of the alloys at 1000 degree centigrade for 60 h image

Surface antioxidant coating technology for W-based alloys is an important measure for the oxidation protection of material surfaces and has been widely used for the oxidation protection of refractory metals. Among them, halide-activated packet cementation (HAPC), chemical vapor deposition (CVD) technology, and hot dipping silicification (HDS) technology have won the favor of more researchers in the oxidation protection of W-based materials due to their excellent process conditions.

Oxidation Behavior of W-Cr-Y-Zr Alloy

Details: Category: Tungsten's News; Published on Sunday, 30 April 2023 14:39; Written by Caodan; Hits: 673

The mS values vs. time of W-Cr-Zr oxidation tests at 1000 temperature image

Researchers prepared W-Cr-Y-Zr alloy and investigated its oxidation behavior. Elisa et al. prepared W-10Cr-0.5Y and W-10Cr-0.5Y-0.5Zr (wt%) alloys by HIP and heat treatment (HT) techniques. The surface image results show the morphology of the heat-treated W-10Cr-0.5Y and W-10Cr-0.5Y-0.5Zr (wt%) alloys with heat treatment temperatures and times of 1550°C and 1.5 h.