Quick Search:       Advanced Search
李瑞,陈璇,王娟,李斌,王涛,严富学,张国君.双峰结构Mo-Si-B基体表面多层硅化物涂层的表征和抗氧化性能[J].稀有金属材料与工程(英文),2021,50(5):1531~1541.[Li Rui,Chen Xuan,Wang Juan,Li Bin,Wang Tao,Yan Fuxue and Zhang Guojun.Characterization and Oxidation Resistance of Multilayered Silicide Coating on Bimodal Mo-Si-B Substrate[J].Rare Metal Materials and Engineering,2021,50(5):1531~1541.]
Characterization and Oxidation Resistance of Multilayered Silicide Coating on Bimodal Mo-Si-B Substrate
Download Pdf  View/Add Comment  Download reader
Received:December 07, 2020  
DOI:
Key words: MoSi2 coating  Mo-12Si-8.5B alloy  bimodal α-Mo grains  pack cementation  oxidation resistance
Foundation item:
Author NameAffiliation
Li Rui,Chen Xuan,Wang Juan,Li Bin,Wang Tao,Yan Fuxue and Zhang Guojun  
Hits: 41
Download times: 49
Abstract:
      To enhance the surface protection of the bimodal Mo-Si-B alloy and simultaneously maintain its superior mechanical properties, a multilayered coating (MoSi2, Mo5Si3 and Mo5SiB2/MoB) was synthesized on its surface via pack cementation. Results show that, compared to the coating on the fine-grained substrate, the coating surface on the bimodal substrate is rougher and exhibits bimodal microstructure. Additionally, the fracture toughness of bimodal alloy after coating is acceptable. The distributed La2O3 particles toughen the coating. Besides, the coated bimodal specimens show excellent oxidation resistance at 1100~1300 °C, which is attributed to the quick formation of a thin and self-healing SiO2-B2O3 film on the coating surface. With increasing the temperature, the thickness of SiO2-B2O3 film and the oxidation product Mo5Si3 increase because the viscosity of SiO2-B2O3 film decreases. Also, improving temperature promotes the interdiffusion of Si and B, accelerating the growth of Mo5Si3 and Mo5SiB2/MoB layers. Compared to the coated bimodal alloy, the coated fine-grained alloy exhibits more oxidation mass gain at 1300 °C since the unimodal MoSi2 coating has more grain boundaries.