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CERAMICS INTERNATIONAL · 2022 ·Vol. 49 ·期 3 ·4863-4871 · IF 5.532

Oxidation behavior of Ti3SiC2 powder synthesized by using biochar, Si and Ti

Kai Su,Xuekun Tian,Zhenzhen Li,Xinhong Liu

Biochar was proposed as a novel carbon source for synthesizing Ti 3 SiC 2 powder with high purity by a simple pressureless sintering at 1673 K, and Ti 3 SiC 2 grains exhibited the typical nanolayered structure. The oxidation behavior of Ti 3 SiC 2 powder showed the parabolic law during isothermal oxidation from 1273 K to 1473 K. Dense and continuous oxidation layer consisting of mixed TiO 2 and SiO 2 was formed rapidly on the surface of Ti 3 SiC 2 particles as a diffusion barrier , which effectively retarded the inward diffusion of oxygen, conferring good oxidation resistance of the powder.

研究领域: 材料科学 · 无机非金属材料 · 高温材料 · 复合材料 · 材料化学 · 固体化学 · 功能材料

✓ 已验证 DOI 高影响因子

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CERAMICS INTERNATIONAL · 2024 ·Vol. 51 ·期 5 ·6587-6598 · IF 5.1

Preparation and ablation performance of (ZrC/SiC)35 multilayer alternating coating with sub-micro sublayers thickness

Bo Li,Yigao Chen,Shaopeng Wang

A (ZrC/SiC) 35 multilayer alternating coating with 500∼700 nm sublayers thickness and 70 interfaces was deposited on sharp leading edge C/C composites by continuous CVD method. Its mechanical property and ablation resistance were assessed by scratch test and oxy-acetylene flame respectively and compared with ZrC monolayered coating. The (ZrC/SiC) 35 multilayer alternating coating exhibited a high bonding strength via the regulation of sub-micro alternating stress field and the inhibition of crack propagation by 70 interfaces, showing a high critical load L C3 of 22.521 N, which was higher than that of ZrC monolayered coating of 5.688 N. Furthermore, the coating revealed excellent ablation resistance evidenced by its intact oxide layer, and the mass and linear ablation rates were only 0.17 mg/s and 0.87 μm/s respectively. The layer-by-layer oxidation behavior allowed the advantages of ZrC and SiC sublayers to be fully utilized, thus maintaining the layered oxide structure. Furthermore, the total 35 layers of thin ZrO 2 layers improved the fault tolerance ability of coating in harsh ablative environments.

研究领域: 材料科学 · 表面工程 · 高温防护涂层 · 复合材料 · 力学性能 · 热防护系统

✓ 已验证 DOI 高影响因子

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY · 2016 ·Vol. 41 ·期 22 ·9611-9618 · IF 3.205

Oxidation behavior of Cu-doped MnCo2O4 spinel coating on ferritic stainless steels for solid oxide fuel cell interconnects

Jinhua Xiao,Wenying Zhang,Chunyan Xiong,Bo Chi,Jian Pu,Li Jian

Spinel oxides with the general formula of MnCu x Co 2−x O 4 (x = 0.1, 0.3, 0.5, 0.7 respectively) are used as coating materials on the metallic interconnect SUS 430 alloy to reduce the cathodic performance degradation by Cr poisoning and the interfacial resistance to improve the surface stability. The effect of Cu doping at the B position of spinel on the electrical conductivity and coefficient of temperature expansion (CTE) is investigated to determine the oxidation behavior and effectiveness as a protective layer. The result confirms that MnCu 0.5 Co 1.5 O 4 spinel shows highest electrical conductivity of 105.46 S cm −1 at 750 °C in air and an average CTE value of 12.27 × 10 −6 K −1 at temperature range of 20–960 °C. MnCu 0.5 Co 1.5 O 4 coating is stable enough after 2000 h cyclic oxidation at 750 °C. The growth of Cr 2 O 3 and formation of MnCr 2 O 4 in the scale layer are effectively suppressed by the presence of MnCu 0.5 Co 1.5 O 4 coating. The oxidation kinetics obeys the parabolic law with a rate constant as low as 2.76 × 10 −15 g 2 cm −4 ·s −1 and the ASR contributed by the oxide scale is 8.04 mΩ cm 2 at 750 °C. The research indicates that MnCu 0.5 Co 1.5 O 4 is a promising coating material for metallic interconnects of the intermediate temperature solid oxide fuel cells .

研究领域: 材料科学 · 能源材料 · 固体氧化物燃料电池 · 表面工程 · 电化学 · 高温腐蚀 · 功能涂层

✓ 已验证 DOI 高影响因子

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Oxidation behavior of Ti3SiC2 powder synthesized by using biochar, Si and Ti

Preparation and ablation performance of (ZrC/SiC)35 multilayer alternating coating with sub-micro sublayers thickness

Oxidation behavior of Cu-doped MnCo2O4 spinel coating on ferritic stainless steels for solid oxide fuel cell interconnects