Oxidation Resistance of the ZrSi2–MoSi2–ZrB2–ZrC Coating on the C/C–SiC Composite in High-Speed High-Enthalpy Air Plasma Flow

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING
A. N. Astapov, B. E. Zhestkov, V. A. Pogodin, I. V. Sukmanov
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Abstract

The oxidation resistance of a coating, which is formed by firing deposition of layers from a ZrSi2–MoSi2–ZrB2–Si powder mixture, on a C/C–SiC composite substrate is studied. Oxidation resistance tests are carried out under interaction with a high-speed air plasma flow at temperatures up to 2200°C. The performance of the coating is ensured by the formation (and evolution during operation) of a heterogeneous oxide film based on borosilicate glass modified with zirconium, which is an efficient barrier to oxygen diffusion and promotes the passivation of oxidation processes. An increase in the operating temperatures above 1750–1800°C leads to glass phase evaporation from the surface and the formation of a porous thermal barrier layer based on ZrO2 and containing secondary phases Mo/MoO2, Mo3Si, and Mo5Si3. The temperature gradient across the coating thickness favors partial preservation of the glass phase in the inner layers due to a decrease in the vapor pressure, which results in the retardation of oxygen diffusion deep into the material. The temperature–time ranges of performance; the characteristics of mass loss, catalytic activity, and emissivity of the coating; and the main factors limiting the efficiency of its protective action are determined.

Abstract Image

Abstract Image

高速高焓空气等离子体流中 C/C-SiC 复合材料上的 ZrSi2-MoSi2-ZrB2-ZrC 涂层的抗氧化性
摘要 研究了在 C/C-SiC 复合基底上通过烧结沉积 ZrSi2-MoSi2-ZrB2-Si 粉末混合物层形成的涂层的抗氧化性。在温度高达 2200°C 的高速空气等离子流作用下进行了抗氧化测试。涂层的性能通过基于硼硅玻璃的异质氧化膜的形成(以及在运行过程中的演变)得到了保证,该氧化膜由锆修饰,是氧气扩散的有效屏障,并促进了氧化过程的钝化。当工作温度升高到 1750-1800°C 以上时,玻璃相从表面蒸发,形成了以 ZrO2 为基础的多孔隔热层,其中含有 Mo/MoO2、Mo3Si 和 Mo5Si3 等次生相。整个涂层厚度的温度梯度有利于玻璃相在内层的部分保留,这是因为蒸气压的降低导致氧气扩散到材料深处的速度减慢。研究确定了涂层的性能温度-时间范围、质量损失、催化活性和发射率特征,以及限制其保护作用效率的主要因素。
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来源期刊
Russian Metallurgy (Metally)
Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
0.70
自引率
25.00%
发文量
140
期刊介绍: Russian Metallurgy (Metally)  publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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