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Tuesday, 17 September 2019
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Raw materials & technologies, Raw materials, Coatings pigments

Influence of Cr content and heat treatment on the optical properties of mica pigments

Thursday, 30 July 2015

In a study, a researcher from Islamic Azad University of Najafabad, Isfahan, Iran, prepared green nano Cr2O3-coated mica pigments by homogeneous precipitation.

The results showed that an amorphous coating was synthesised and crystallised to Cr<custom name='sub'>2</custom>O<custom name='sub'>3</custom> after heat treatment at 800°C. Source: Frog 974/Fotolia
The results showed that an amorphous coating was synthesised and crystallised to Cr2O3 afte...

He investigated structure, morphology, and optical properties by X-ray diffraction, thermogravimetric and differential thermal analysis, scanning electron microscopy, and colourimetric analysis.

Heat treatment at 800°C

The results showed that an amorphous coating was synthesised and crystallised to Cr2O3 after heat treatment at 800°C. Average particle size of the coating was about 100 nm. The optical properties of the final pigment depended on the Cr content and heat-treatment temperature. The pearlescent index increased as chromium nitrate content increased and then decreased. Lower calcination temperature can cause lower L* value and pearlescent index.

The study is published in: Journal of Coatings Technology and Research, July 2015, Volume 12, Issue 4, pp 751-756

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