Structure and Properties of Cobalt-Containing Underglaze Color for Decorating Porcelain

This article brings to attention for Gzhel' porcelain an investigation of the properties and structure of underglaze paints with different cobalt pigments and thedevelopment of a paint composition based on them that resists changes in temperature and the ambient gas medium on firing, and is also less labor-intensive to manufacture. Underglaze paints based on cobalt oxide and pigments synthesized in the chemical systems Co-Al-Si and Co-Si were investigated. Their behavior on painting, color characteristics after firing at 1200 - 1320 degrees C, and resistance to the formation of defects with changes in temperature and the gaseous medium on firing were analyzed. The relationship between the structure of paints on porcelain and its decorative properties was established. Paint with an optimal combination of pigments in the systems Co-Al-Si and Co-Si was introduced into production, corresponding in decorative effect to paint with Co3O, but resistant to metallization defects on firing and less expensive.