About the temperature characteristics of zirconia bricks

Speaking of zirconia bricks, it is a kind of refractory material that uses zirconia and alumina as the basic materials, and is a refractory material prepared by crushing. Let's take a look at it today.

Zirconia bricks are made of corundum, synthetic mullite and monoclinic zirconia as raw materials, and the compounds are formed by isostatic pressing and fired at 1650 °C ~ 1700 °C. The variation law of the flexural strength of the specimen with temperature is as follows: the strength first increases with the temperature, reaches the turning point temperature, and then decreases with the increase of temperature, which is the result of the thermal expansion mismatch between different crystalline phases and the local healing of microcracks. The turning point temperature is 800°C--900°C. Due to the martensitic phase transformation of zirconia, there is a "valley" at 1000 °C - 120 °C, and the valley floor is at 1100 °C.

In addition, because of the addition of zirconia, zirconia bricks have a very obvious impact on the mechanical properties of high temperatures, and the structural skeleton strength and microcrack density, the latter generally occupies a dominant position. When the zirconia content is about 15%, the evenly dispersed zirconia is filled in the corundum 3354 mullite skeleton, which plays a certain strengthening role in the effect, but the weakening caused by the microcracks caused by the martensitic phase transformation exceeds this strengthening effect and the strength is reduced.

The use temperature of zirconia bricks can reach more than 1750 degrees Celsius, and the load softening temperature is high, the use rate is longer, the bulk density is 2.3-3.0g/cm, while the zirconia bricks are only 1.3~1.5g/cm, the same cubic meter volume, the use of zirconia bricks can reduce the weight of 1.1-1.9 tons. If zirconia bricks are used, 1.1-1.9 tons of corundum bricks can be saved per cubic meter, and 80% of refractory insulation materials can be saved. It has a very good thermal insulation effect, thereby reducing heat dissipation and improving thermal efficiency, so as to save energy, and the energy-saving effect reaches more than 30%.

The above is the knowledge about the relevant temperature characteristics of zirconia bricks, zirconia bricks have very excellent thermal insulation performance, and can play a role in saving energy, which is why it has gradually become one of the main reasons for everyone's use, we must carefully select when buying zirconia bricks, to avoid buying zirconia bricks of poor quality. If you have any other questions or questions about zirconia bricks, we welcome your call and look forward to cooperating with you.