CaO-MgO-Glaze for Cordierite Clay Body

Abstract

In Finland there occurs magnesium containing saw-waste as a by-product from soapstone industry included talc minerals, which can be used for manufacturing of cordierite clay body. In this work properties and raw materials, which are needed for glazes used to cover the magnesium silica clay body, have been investigated and evaluated. With Finnish whiting, dolomite and feldspar FFF as raw materials also the phlogopite mica, a by-product from apatite mine, has been used as a glaze. The limited industry production can withstand some variations and thus utilize natural rock minerals which also colour the glazes. The glazes have a high viscosity and a good covering effect. Colours have a brownish beige or yellow tone from iron oxide when magnesium and calcium oxide are used together. The surfaces of the glazes, which are developed in this investigation, can be used both for tableware design, which withstands chock temperatures and in applications for illustrious tile surfaces in the tile industry.