Thermal shock resistance physical and chemical properties of Refractory Brick

The thermal shock resistance of refractory brick is the comprehensive performance of their mechanical properties and thermal properties under the conditions of temperature change. Refractory brick subjected to rapid temperature changes, known as thermal shock. Firebrick in the thermal shock generated in the new crack, and the new crack and crack growth caused by the original crack, peeling, fracture and other conditions, known as the firebrick thermal shock damage. Thermal shock damage is the result of thermal stress, refractory bricks in the temperature changes, deformation is suppressed by the stress generated by thermal stress.
Reheat line change of silica brick, thermal stress is produced when the thermal expansion of refractory brick is evenly affected by the temperature gradient, as well as in the phase transition, when different phases are changed in temperature. The thermal stress is proportional to the elastic modulus and elastic strain of the refractory brick, and the modulus of elasticity of the refractory brick is the product of the linear expansion coefficient and the temperature change.
The thermal shock resistance of refractory brick is the ability of refractory brick to resist damage under the conditions of rapid temperature change. Has been said that thermal stability, thermal shock stability, thermal shock resistance, resistance to temperature abrupt change, resistance to abrupt heat,etc, refractory brick in the low temperature and medium temperature is brittle material, the lack of ductility, thermal equipment, refractory Brick is often subjected to drastic temperature changes that cause damage. Thermal shock resistance is one of the important performance properties of refractory brick.
The physical and chemical properties of refractory brick:
Refractory brick is metallurgical ferrosilicon and industrial silicon occurs when the SiO2 and Si gaseous oxygen and oxygen in the rapid condensation of the composition and an ultra-fine silicon powder material. The following describes the physical and chemical properties of refractory brick:
Refractory brick: the appearance of gray Jifen gray ﹑ refractoriness> 1600 ℃. Bulk density: 200 ~ 250 kg / cubic meter.

Which points should be paid attention to when using refractory material？

1.After pouring, if without adequate maintenance, due to the lining body early strength is low, the structure is loose, often too late to sintering has been damaged, lining up abruptly, sometimes burst.

2. The lining thickness of thin body, pouring the space is little, between mold and burner with a lot of cramp, pouring, vibrating, the operation of the vibrator is extremely difficult, operation not skilled or not serious, refractory castable vibrating false.

3.Casting during the construction of the space is little, construction personnel are often more mixing materials with water, to make the refractory castable has good liquidity, but increase the porosity in the refractory lining of the body, reduce the density of the lining body, thus reducing its strength (if refractory castable for chemical combination, add too much liquid binder, same adverse effects) : on the contrary, lining body vibrating close-grained, not also will shorten the service life of refractory castable.

4.When the winter construction, low temperature binder (hydration) hydration incomplete or not hydration, or casting seas, would seriously reduce the strength of the refractory castable or destroy its structure, so as to affect the use effect.