Oxidation resistance and infrared emissivity of MoSi2@SiO2 particles prepared via TEOS hydrolysis self-assembly method

被引：16
作者：
Chen, Yuejun [1 ,2 ]
Zhu, Shizhen [1 ]
Ji, Yanqi [1 ]
Ma, Zhuang [1 ]
Wei, Hengyong [2 ]
机构：
[1] Beijing Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R China
[2] North China Univ Sci & Technol, Coll Mat Sci & Engn, Hebei Prov Key Lab Inorgan Nonmetall Mat, Tangshan 063210, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 810卷
基金：
英国惠康基金; 英国医学研究理事会;
关键词：
Thermal protection coating; Self-assembly; Oxidation resistance; High emissivity; MoSi2@SiO2; SILICA-GEL; GLASS; FILMS;
D O I：
10.1016/j.jallcom.2019.151745
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In order to avoid infrared emissivity deterioration of MoSi2 particles result from its high-temperature oxidation, a satisfactory electrostatic self-assembly process was presented to synthesize MoSi2@SiO2 particles. A thermally stable and transmitting infrared SiO2 shell was formed with tetraethyl orthosilicate (TEOS) as a precursor and tetrabutyl ammonium bromide (TBAB) as an electrostatic adsorbent after heat treatment at 1200 degrees C. The oxidation resistance, composition, micro-morphology and infrared emissivity of MoSi2@ SiO2 were studied using thermogravimetric analysis, X-ray diffraction, energy disperse spectroscopy, scanning electron microscopy, and ultravioletevisible near-IR spectrophotometer. The results demonstrated that MoSi2 particle was thoroughly encapsulated by a SiO2 glass shell, consequently, it exhibited great oxidation resistance compared with that of unencapsulated. More importantly, the emissivity of MoSi2@SiO2 particles had no obvious recession due to the intact encapsulation with TBAB. In addition, the electrostatic self-assembly mechanism of core-shell (MoSi2@SiO2) particles was discussed. (C) 2019 Elsevier B.V. All rights reserved.
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页数：6
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