New Microporous Materials for Use in Modern Firing Plants

摘要

Heat insulating materials with silicate constituents are widely used in industrial firing systems, in the form of fibre products, bricks and concrete. In a recently completed group project a new type of insulating material was developed on the basis of microporous and high-alumina raw materials. It features excellent thermal insulating properties in high-temperature processes, high thermal shock resistance, resistance to chemical attack, and low shrinkage rates. The new material made of micro-porous calcium hexaluminate has been successfully tested in kiln cars in the porcelain industry as well as in the form of wall bricks. The new refractory materials were continuously monitored and studied over a test period lasting over three years. A large part of the materials is still in use today. Particular potential is seen for use of the new material in kilns fired with hydrogen atmospheres at temperatures above 1250℃.