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Moisture-proof and Enhanced Effect of Inorganic Coating on Porous Si_3N_4 Ceramic 被引量:1
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作者 程传兵 FAN Runhua +3 位作者 WANG Chonghai WANG Hongsheng ZHOU Changling 刘福田 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第2期311-314,共4页
Inorganic coating was fabricated on the surface of the porous Si3N4 ceramic by polymer derived(PD) and spraying technology, via using vinyl-polysilazane(PSN-1) as a preceramic polymer and Si3N4 and lithium alumino... Inorganic coating was fabricated on the surface of the porous Si3N4 ceramic by polymer derived(PD) and spraying technology, via using vinyl-polysilazane(PSN-1) as a preceramic polymer and Si3N4 and lithium aluminosilicate(LAS) powders as fillers. The phase and microstructure of the coatings were analyzed by X-ray diffraction(XRD) analysis and scanning electron microscopy(SEM), respectively. The effect of the coatings on mechanical property and humidity resistance of the porous Si3N4 ceramic was investigated. The experimental results showed that we successfully fabricated the uniform and dense coating which preferably combined with the substrate upon the addition of fillers. The bending strength of the porous Si3N4 ceramic sprayed the coating increased by more than 18%, and the surface hardness increased by 1.7 times. The apparent porosity of the materials reduced by an average of 97.7%, and water absorption was below 0.5%. Therefore, the prepared coating with preferable density had an obviously moisture-proof and enhanced effect on the porous Si3N4 ceramic. 展开更多
关键词 inorganic coating Si3N4 ceramic moisture-proof and enhanced coating polymer derived radome
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Enhancement of Heat-Resistance of Carbonyl Iron Particles by Coating with Silica and Consequent Changes in Electromagnetic Properties 被引量:1
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作者 Zhao-Wen Ren Hui Xie Ying-Ying Zhou 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第10期56-59,共4页
Silica-coated carbonyl iron particles (CIPs) are fabricated with the Stober method to improve their heat-resistance and wave-aSsorption properties. The morphology, heat-resistance, electromagnetic properties and mic... Silica-coated carbonyl iron particles (CIPs) are fabricated with the Stober method to improve their heat-resistance and wave-aSsorption properties. The morphology, heat-resistance, electromagnetic properties and microwave absorption of raw-CIPs and silica-coated CIPs are investigated using a scanning electron microscope, an energy dispersive spectrometer, a thermal-gravimetric analyzer, and a network analyzer. The results show that the heat-resistance of silica-coated CIPs is better than that of raw CIFs. The reflection losses exceeding -lOdB of silica-coated CIPs are obtained in the frequency range 9.5-12.4 GHz for the absorber thickness of 2.3 mm, and the same reflection losses of uncoated CIPs reach the data in the lower frequency range for the same thickness. The enhanced microwave absorption of silica-coated CIPs can be ascribed to the combination of proper electromagnetic impedance match and the decrease of dielectric permittivity. 展开更多
关键词 ab Enhancement of Heat-Resistance of Carbonyl Iron Particles by coating with Silica and Consequent Changes in Electromagnetic Properties Figure
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Sol-gel preparation of a silica antireflective coating with enhanced hydrophobicity and optical stability in vacuum 被引量:1
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作者 张清华 周炼 +3 位作者 杨伟 惠浩浩 王健 许乔 《Chinese Optics Letters》 SCIE EI CAS CSCD 2014年第7期37-40,共4页
A new silica antireflective coating with improved hydrophobicity and optical stability in a vacuum is obtained by a two-step route. Firstly, silica sols are prepared with a sol-gel process, in which tetraethyl orthosi... A new silica antireflective coating with improved hydrophobicity and optical stability in a vacuum is obtained by a two-step route. Firstly, silica sols are prepared with a sol-gel process, in which tetraethyl orthosilicate is utilized as a precursor. And by introduction of fluorine containing glycol into the sols, the porosity of silica particles and surface polarity of the coatings are decreased. Afterward, coatings are constructed with low surface roughness by modification of PMBA-PMMA. The coatings retain transmission of up to 99.6%, and laser damage threshold of about 50 J/cm^2 at a wavelenth of 532 nm (1-on-1. 10 ns) 展开更多
关键词 Sol-gel preparation of a silica antireflective coating with enhanced hydrophobicity and optical stability in vacuum PMMA
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