A multifunctional Mg2Si5Al4O18/Y2Si2O7 glass-ceramic coating for porous Si3N4 ceramic

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

Surface & Coatings Technology Pub Date : 2024-09-28 DOI:10.1016/j.surfcoat.2024.131409

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Abstract

In order to enhance the oxidation and moisture resistance of porous Si₃N₄ ceramics, here we design a novel Y₂O₃-MgO-Al₂O₃-SiO₂ glass-ceramic coating through a straightforward scraping process followed by sintering method. The crystalline phase, water absorption, dielectric properties and high temperature resistance of the coating are evaluated systematically. The result shows that the coating obtained by sintering at 1200 °C for 30 min exhibits high density, with an approximate thickness of 88 ± 5 μm. The crystalline phases present in the coating are composed of Mg₂Si₅Al₄O₁₈ and Y₂Si₂O₇. The water absorption rate of the coating is only 0.59 %, and its dielectric constant ranges from 3.3 to 3.4 in the frequency range of 2–20 GHz, with a low dielectric loss tangent below 4 × 10⁻³. After exposure to high-temperature (1000 °C for 30 min), no significant changes are observed in the microstructure or water absorption rate of the coating. Therefore, this study has successfully developed a multifunctional glass-ceramic coating that is moisture-proof, high-temperature resistant, and exhibits low dielectric loss.

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用于多孔 Si3N4 陶瓷的多功能 Mg2Si5Al4O18/Y2Si2O7 玻璃陶瓷涂层

为了增强多孔 Si3N4 陶瓷的抗氧化性和防潮性，我们在此设计了一种新型 Y2O3-MgO-Al2O3-SiO2 玻璃陶瓷涂层，该涂层采用直接刮削工艺和烧结方法制成。我们对涂层的晶相、吸水性、介电性能和耐高温性能进行了系统评估。结果表明，在 1200 °C 下烧结 30 分钟得到的涂层密度高，厚度约为 88 ± 5 μm。涂层中的晶相由 Mg2Si5Al4O18 和 Y2Si2O7 组成。涂层的吸水率仅为 0.59%，其介电常数在 2-20 GHz 频率范围内为 3.3 至 3.4，介电损耗正切低于 4 × 10-3。在暴露于高温（1000 °C 30 分钟）后，涂层的微观结构和吸水率没有发生明显变化。因此，这项研究成功地开发出了一种防潮、耐高温、介电损耗低的多功能玻璃陶瓷涂层。

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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.