With the continuous progress in the production and use of refractory castables, it is necessary to improve the wear resistance and thermal shock resistance of refractory castables. The research and development of new refractory castables with excellent high-temperature strength, good thermal shock resistance, and good corrosion resistance will help improve the life of cement kiln linings. Rongsheng refractory manufacturer. There are two important measures to improve the performance of refractory castables. In this article, you can also learn another two ways to improve the performance of refractory castables.
Reduce the critical particle size of the castable. From 8mm to about 5mm.
Improve the flexural strength of the castable in the medium temperature and hot state. At a medium temperature of 900°C, the flexural strength of the castable indirectly reflects the wear resistance of the castable. The current development trend is to require the hot flexural strength of the castable to be no less than 20MPa.
Improve the bonding ability of the castable matrix. It is formulated with multi-level micro powder and super micro powder to form the tightest accumulation. Promote sintering at medium temperature and improve the bonding ability of the castable matrix.
Use high-hardness refractory materials as aggregates.
Measures to improve thermal shock resistance of wear-resistant castables
Firstly, It adopts composite aggregate and composite powder, that is, complex phase technology. The difference between the linear expansion coefficient of aggregate and matrix is used to balance the strength and thermal shock resistance of the castable.
High expansion aggregate + low expansion matrix. This combination is very resistant to thermal shock.
Low expansion aggregate + low expansion matrix. This combined castable has uniform bonding and high mechanical strength. General thermal shock will not produce huge stress in the castable, and cracks will appear.
Then, Reduce the thermal expansion rate of the material. Try to choose materials with a relatively low thermal expansion rate to improve the thermal stability and mechanical impact of the castable.
How to Improve the Performance of Refractory Castables?
In addition, the performance of refractory castables can also be improved according to the application characteristics of refractory materials.
Add water reducing agent to refractory castable
Seeing such topics, it is estimated that everyone is like me, the first thing that comes to mind is what is the use of refractory castables added to water-reducing agents.
The water reducing agent is added to the castable, which can significantly reduce the amount of mixing water added during the construction of the castable. In the case of constant water consumption during the construction of the castable, it can also increase the fluidity or plasticization of the castable.
Water reducing agent is an electrolyte material of surface-active substance, which is dissolved in castable and can be adsorbed on the surface of particles. By increasing the repulsive force between the ion surface and the particles in the solution, the free water which is composed of fine particles and wrapped in the castable structure is released. It plays a role in wetting and dispersing. Water reducing agents can also be called a dispersing agent.
Water reducing agent is a dispersant or flow agent of high alumina cement, which plays a plasticizing or deflocculating role in refractory castables. Under the condition of keeping the flow value of the refractory castable basically unchanged, the water reducing agent does not chemically react with the comprehensive components of the raw and auxiliary materials in the castable, nor does it generate compounds, but only plays a physical and chemical role on the surface.
Because the water reducing agent can release the free water in the castable structure. Therefore, while keeping the fluidity of the castable unchanged, the water consumption during the construction of the castable can be reduced. Or under the condition that the castable does not change the unit water consumption, increase the rheology of the castable, improve the working skills, and make the refractory castable easier to construct and shape.
In the production of refractory castables, steel fiber refractory castable products of different diameters are added. Steel fiber is a product made of heat-resistant and wear-resistant stainless steel or other steel types. Common steel fiber specifications are 20mm, 25mm, 30mm, and 35mm. Steel fiber castable is a refractory castable with high strength, good thermal shock resistance, and good wear resistance. Adding steel fiber to the refractory castable can enhance the performance of the castable and increase the use effect.
The effects of adding steel fiber to refractory castable are:
(1) Enhance the toughness of the lining, improve the resistance to mechanical impact, and wear resistance.
(2) Improve thermal shock resistance, improve cracking, and peeling resistance.
(3) Suppress linear shrinkage after curing, drying, and heat treatment.
The refractory castable is added with steel fiber to enhance the use effect after pouring, but the amount of steel fiber added to the castable is determined according to the requirements of the technical department. Too much steel fiber added to the castable can cause damage to the lining at high temperature after pouring, reduce the corrosion resistance of the lining, and affect the performance of the kiln lining.
The Rongsheng refractory castable manufacturer has an advanced and fully automatic refractory castable production line with an annual output of tons. Rongsheng is a strong refractory material manufacturer and sales company. Rongsheng has served customers in more than 60 countries around the world. For example, etc. Moreover, our refractory family R&D team is also working hard to provide customers with refractory linings that best suit their production needs. If you want to know the manufacturer of Rongsheng refractory materials or want to obtain a quotation of refractory materials, such as low cement castable, phosphate bonded castable, high alumina castable, corundum castable, etc. please contact us. We will provide you with services according to your specific needs.
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