| ZHANG Hang,HE Guang-hui,ZHANG Jia-qiang,WEN Chen,ZHANG Li-gong,CUI Qing-xin,BAI Jing-ying.Preparation and Performance of Inorganic Thermal Control Coatings Based on Zinc Orthotitanate[J],47(9):81-85 |
| Preparation and Performance of Inorganic Thermal Control Coatings Based on Zinc Orthotitanate |
| Received:April 25, 2018 Revised:September 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.09.011 |
| KeyWord:zinc orthotitanate coprecipitation calcination inorganic thermal control coatings solar absorptance infrared emittance |
| Author | Institution |
| ZHANG Hang |
Beijing Spacecrafts, Beijing , China |
| HE Guang-hui |
Beijing Spacecrafts, Beijing , China |
| ZHANG Jia-qiang |
Beijing Spacecrafts, Beijing , China |
| WEN Chen |
Beijing Spacecrafts, Beijing , China |
| ZHANG Li-gong |
Beijing Spacecrafts, Beijing , China |
| CUI Qing-xin |
Beijing Spacecrafts, Beijing , China |
| BAI Jing-ying |
Beijing Spacecrafts, Beijing , China |
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| Abstract: |
| The work aims to enrich and develop space-stable thermal control coatings of low solar absorptance (αS) and high infrared emittance (εH), and to study inorganic thermal control coatings filled with zinc orthotitanate (Zn2TiO4). With oxalic acid, titanium tetrachloride and zinc chloride as raw materials, Zn2TiO4 powder was synthesized in the combined method of coprecipitation, calcination and acid washing. Crystal structure and microstructure of the Zn2TiO4 powder were characterized by XRD and SEM, respectively. Then inorganic thermal control coatings were obtained with Zn2TiO4 as filler and potassium silicate (K2SiO3) as adhesive. Cross cut test and thermal cycle test were adopted to study adhesion and thermo-environment adaptability of the coatings. High purity Zn2TiO4 filler was prepared through acid washing, its particle size ranged from 0.5 μm to 3 μm. The αS and εH of the Zn2TiO4/K2SiO3 inorganic thermal control coatings was 0.13±0.02 and 0.90±0.02, respectively. Adhesion of the coatings as tested in the cross cut test was grade 1. The coatings was free from spalling after 100 thermal cycles at 196~200 ℃. Zn2TiO4/K2SiO3 inorganic thermal control coatings made from high purity Zn2TiO4 filler exhibits excellent thermal control performance, which is of good application prospects in external surface of spacecrafts as it can meet thermal control design requirements of spacecrafts which feature in high efficiency and long service life. |
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