Production process of lightweight thermal insulation brick
1. Use alumina hollow balls to make thermal insulation bricks
Alumina hollow spheres are lightweight aggregates, which ensure high temperature resistance and reduce density; corundum powder is an inert filler; sillimanite is an expansion agent, which reduces firing shrinkage and improves thermal shock resistance; alumina Micropowder, silica micropowder and clay powder are binding agents, which reduce the sintering temperature, form a mullite binding phase, and improve the high temperature resistance and thermal shock resistance of thermal insulation bricks.
The brick material is prepared according to the set batching plan, after kneading, forming, and natural drying for 24 hours, then drying at 110°C for 24 hours and firing at 1600°C*4h to obtain thermal insulation bricks. When the sillimanite content is 12%, the performance of the thermal insulation brick made is: bulk density 1.48g/cm3, compressive strength 26MPa, softening temperature under load 1710℃, linear shrinakge at 1600℃*2h +0.3%, Thermal shock resistance (1100℃-water cooling) 17 times. The thermal insulation brick made has the characteristics of light weight, high strength, high temperature resistance and thermal shock resistance.
Next issue we will continue to introduce the use of lightweight aggregate and combustible materials to make thermal insulation bricks. Please stay tuned!
