Abstract
SiB6 powders were prepared by the “chemical oven” method from Si and B powders. Here combustion with acid pickling “two‐step” mode replaces the traditional synthesis method which helps to avoid severe condition of high temperature and high pressure. It could realize maximum reaction temperature to about 2000°C, and the whole process just needs ∼30 s. The average diameter of products is ∼10 μm. And the raw material Si and B are ∼3 μm and ∼20 μm, respectively. The infrared emissivity of products was evaluated by UV‐vis spectrum with absorption band around 250∼2500 nm. All five samples show higher emissivity over UV‐visible light range with lower emissivity over near‐infrared range. Typically, the sample’s Si/B ratio of 1 : 1 shows highest integral intensity for about 0.85 compared with other molar ratios. It can be used as a more simple and effective method to obtain infrared ceramic SiB6 with high emissivity.
Highlights
Infrared radiation coating could improve the emissivity of coating surface effectively [1, 2], enhancing the radiation heat transfer and achieving the purpose of energy saving.us, it shows a broad application prospect on the energy conservation of industrial kiln
SiB6 is a good candidate as radiation substrate, which can be applied to infrared radiation coatings above 1300°C [3]
Advances in Materials Science and Engineering oven” [7]. us, inspired by this work, we propose to use a similar method for SiB6 synthesis. e external reactant on the surface is ignited by high-energy heat input, and combustion occurs in a certain internal wave propagation rate of reactant particles. en the inner reactant was lit by external reaction heat
Summary
Infrared radiation coating could improve the emissivity of coating surface effectively [1, 2], enhancing the radiation heat transfer and achieving the purpose of energy saving.us, it shows a broad application prospect on the energy conservation of industrial kiln. There is no efficient method for synthesis of bulk SiB6 samples. The polycrystalline samples of SiB6 should be prepared under high temperature and hot pressing. The “chemical oven” method has attracted great attention due to its simple process, convenient operation, high yield, and easy industrialization, which has become a hot research topic for powder materials [6].
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