MgO coatings doped with aluminum for transmittance yet hard and low emissivity coating on sapphire substrate

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-02-01 DOI:10.1016/j.surfcoat.2025.131779

Huaizhi Qu , Liangge Xu , Xiangqing Teng , Ateer Bao , Xiaojun Ma , Bing Dai , Sam Zhang , Jiaqi Zhu

引用次数: 0

Abstract

In industrial application environment such as temperature measurement and imaging of molten steel, infrared thermal imagers require that their detection windows have good light transmittance, hardness and low emissivity. In this paper, MgO coatings doped with aluminum on sapphire substrate are prepared by magnetron sputtering are studied. After heat treatment at different temperatures, the microstructure of resultant coatings is gradually transformed from amorphous structure to MgAl₂O₄ phase. After heat treatment at 1000 °C, the hardness and modulus of the coatings reached the highest values of 18.42 GPa and 341.2 GPa. At 300 °C, 400 °C and 500 °C, the emissivity of the coated sapphire is significantly lower than that of the uncoated sapphire substrate. The emissivity has a minimum value after heat treatment at 950 °C.

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.