Enhanced high temperature oxidization resistance of silica coated γ-Ce2S3 red pigments

•Dense silica layer coated γ-Ce2S3 red pigments were easily prepared.•Water/Ethanol ratio and TEOS concentration play improtant roles in the silica nuclei and growth on γ-Ce2S3 surface.•Oxidation resistance temperature was significantly enhanced. Silica layer coated γ-Ce2S3 red pigments were success...

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Bibliographic Details
Published in:Applied surface science 2016-11, Vol.387, p.1147-1153
Main Authors: Liu, Shun-Guo, Li, Yue-Ming, Wang, Zhu-Mei, Shen, Zong-Yang, Xie, Zhi-Xiang
Format: Article
Language:English
Subjects:
Coating
Ethanol
Ethyl alcohol
Heat treatment
Microstructure
Pigment
Pigments
Red pigments
Silica coated
Silicon dioxide
Thermal stability
γ-Ce2S3
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Summary:•Dense silica layer coated γ-Ce2S3 red pigments were easily prepared.•Water/Ethanol ratio and TEOS concentration play improtant roles in the silica nuclei and growth on γ-Ce2S3 surface.•Oxidation resistance temperature was significantly enhanced. Silica layer coated γ-Ce2S3 red pigments were successfully prepared based on a Stober method followed by a hydrogen-argon atmosphere heat treatment at 700°C. The effect of water/ethanol volume ratio and tetraethoxysilane concentration on the microstructure of the coating layer and its high temperature oxidizing protection to pigments was investigated. A transparent silica coating layer with dense microstructure and about 60nm thickness can provide a favorable protection for the red hue of the γ-Ce2S3 pigments. The oxidization resistant temperature was enhanced to 550°C for the dense silica layer coated γ-Ce2S3 pigments as compared to ≤350°C for the uncoated ones. A red color (L*=29.59, a*=27.53 and b*=27.66) was still remained for such silica coated γ-Ce2S3 pigments after heated treated at 550°C in air, indicating its potential for high temperature industrial applications.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2016.07.046