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In this paper, the fly ash cenosphere was coated evenly on the surface with Ni–P alloy in chemical plating method. The coated cenosphere was used for coating as filler, and its heat insulation performance and absorbing performance was tested. The results show that the cenosphere chemical nickel plating material complex dielectric constant is bigger than complex permittivity in both real part and imaginary part. The imaginary part of complex permeability is close to zero, which means it belongs to the electromagnetic loss type materials. e″ appeared the maximum 20·3 when the frequency is 4 GHz. We tested the cenosphere heat insulation coating with self-made heat insulation device. The temperature difference between back coating at balance point and the blank sample reached 10°C, indicating obvious heat insulation effect.

In this paper, we produced spinel structure nanometre cobalt blue powder pigment by chemical coprecipitation. We also modified it through element doping and analysed the spinel structure and colouring mechanism of the pigment. We discussed the process conditions of coprecipitation reaction, the influence of doping element and its content on the properties of cobalt blue pigments spectral reflection effect. The morphology and particle size of powders were characterised through scanning electron microscopy and energy dispersive spectroscopy. The doping element type and content have great influence on the spectral curve of the cobalt pigment. High temperature in sintering contributes to the performance of the products. The sample produced at 1250°C sintering possesses good reflection characteristics, which is similar to chlorophyll.