Refractory bricks, also known as refractory fire bricks, are made mainly from silica and alumina. Dense refractory bricks can generally withstand up to 1770 Celsius degrees. Therefore, they are widely utilized in many industrial fields. In China, as the cement industry develops continuously and rapidly, the demand of refractory bricks is increasing fast. Not only refractory bricks buyers, but also manufacturers hope to produce high-quality refractory fire bricks. Thus, how to evaluate the performance of dense refractory bricks becomes a popular topic.

Refractory bricks, also known as refractory fire bricks, are generally made by heating fireclay until it becomes vitrified in part. Dense refractory brick is famous for its ability to withstand high temperature, which is a useful property that can be applied in a variety of fields. Therefore, some people may wonder why refractory fire bricks are able to possess the valuable property of thermal resistant. How are refractory bricks made and what are the ingredients used in the making process?

Insulating fire brick is a kind of thermal insulation product with a regular shape. The common characteristics of this kind of material are small volume density, light bulk density, low thermal conductivity. But the intensity is low, high temperature reburning shrinkage is larger, heat insulation, good moisturizing effect.

In today’s precision-driven industries, the purity of materials used in production is more than a technical specification—it is a critical determinant of product quality, process safety, and operational efficiency.

Alumina has high melting point and boiling point, high hardness, insulator at room temperature and conductivity at high temperature. Alumina has been used as refractory for melting glass and steel since the 1920s. Zirconia ceramics are widely used in structural ceramics because of their high toughness, flexural strength, wear resistance, excellent thermal insulation and even their thermal expansion coefficient close to metal. In this paper, the important properties and mechanism of zirconia ceramics and its application in various fields are introduced.