多孔BN/SiNO陶瓷上致密MgO-AlO-SiO基微晶玻璃涂层的制备、微观结构及力学性能
The preparation, microstructure and mechanical properties of a dense MgO-AlO-SiO based glass-ceramic coating on porous BN/SiNO ceramics.
作者信息
Sun Yangshan, Cai Delong, Yang Zhihua, Li Hailiang, Li Quan, Jia Dechang, Zhou Yu
机构信息
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology Building C3, No. 2 Yikuang Street, Nangang District Harbin Heilongjiang 150080 China
Key Laboratory of Advanced Structrual-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology Harbin Heilongjiang 150001 China.
出版信息
RSC Adv. 2018 May 15;8(31):17569-17574. doi: 10.1039/c8ra00571k. eCollection 2018 May 9.
A dense MgO-AlO-SiO based glass-ceramic coating was prepared by a doctor blade process on a porous BN/SiNO ceramic surface followed by heat treatment at 1050 °C under nitrogen flow. The phase composition, microstructure, mechanical properties and water absorption of the coating were studied. The coating consisted of α-cordierite phase with a small amount of glass phase. The dense coating without pores and cracks was favorable to seal and densify the porous ceramic surface due to part of the molten glass infiltrating the surface pores. The coating was defect-free and tightly bonded to the substrate because of a larger bonding area between the coating and the substrate. The elastic modulus and bending strength of the glass-ceramic coating were 37.9 GPa and 67.1 MPa, respectively. Moreover, the coated samples had a high Vickers hardness and low water absorption.
通过刮刀法在多孔BN/SiNO陶瓷表面制备了一种致密的MgO-AlO-SiO基微晶玻璃涂层，随后在氮气流下于1050℃进行热处理。研究了涂层的相组成、微观结构、力学性能和吸水性。该涂层由少量玻璃相的α-堇青石相组成。由于部分熔融玻璃渗入表面孔隙，无孔无裂纹的致密涂层有利于密封和致密化多孔陶瓷表面。由于涂层与基体之间的结合面积较大，涂层无缺陷且与基体紧密结合。微晶玻璃涂层的弹性模量和抗弯强度分别为37.9 GPa和67.1 MPa。此外，涂覆后的样品具有较高的维氏硬度和较低的吸水性。
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