Microstructure, oxidation resistance, and anti-coking performance of calcium-doped lanthanum zirconate (La2Zr2O7) coating applied on HP-MA alloy

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2026-10-01 Epub Date: 2026-07-12 DOI:10.1016/j.ceramint.2026.07.160

Mohammad Ghalambaz, Mohammad Hossein Shojaei Vajnani, Abbas Bahrami, Abdoulmajid Eslami, Fatemehsadat Sayyedan

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Abstract

This study investigated the microstructure, high-temperature oxidation resistance, and anti-coking performance of a calcium-doped lanthanum zirconate (La₂Zr₂O₇) coating applied to HP-MA steel. The coating was synthesized via Marcilly method and deposited on the steel substrate using a dip-coating technique. Anti-coking performance was evaluated in a tube furnace at 900 °C under an ethane (C₂H₆) atmosphere. Cyclic oxidation tests were conducted at 1000 °C for a total exposure time of 100 h. The results demonstrate that the coating significantly reduces both the parabolic rate constant (K_p) and weight gain compared to the uncoated steel. Coking tests revealed extensive catalytic coke formation on the bare steel, whereas the coated steel exhibited only minimal, irregularly shaped or spherical coke deposits with negligible evidence of catalytic coking. Energy-dispersive X-ray spectroscopy (EDS) analysis of the coke deposits on the uncoated steel confirmed the presence of metallic particles (Fe, Ni), indicating their catalytic role in coke formation.

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HP-MA合金上掺钙锆酸镧（La2Zr2O7）涂层的显微组织、抗氧化性能及抗结焦性能

研究了HP-MA钢表面掺钙锆酸镧（La2Zr2O7）涂层的显微组织、高温抗氧化性能和抗结焦性能。该涂层采用Marcilly法合成，并采用浸涂技术沉积在钢基体上。在乙烷（C2H6）气氛下，在900 °C的管式炉中评估了抗结焦性能。循环氧化试验在1000 °C下进行，总暴露时间为100 h。结果表明，与未涂层钢相比，涂层显著降低了抛物速率常数（Kp）和重量增加。焦化试验显示，裸钢上形成了大量的催化焦炭，而涂层钢只显示出极少量、不规则形状或球形的焦炭沉积，催化焦化的证据可以忽略不计。能量色散x射线光谱（EDS）分析证实了金属颗粒（Fe, Ni）的存在，表明它们在焦炭形成中的催化作用。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.