Important measures to improve the performance of refractory castables can be taken from many aspects. The following are some key measures:
1. Optimize material composition and structure
1. Select high-purity, synthetic or modified aggregates: such as silicon carbide, silicon nitride, etc., which can greatly improve the high-temperature resistance and wear resistance of the castables.
2. It is formulated with multi-stage micro powder and ultra-fine powder: it forms the tightest packing, promotes sintering at medium temperature, and improves the matrix bonding ability of the castable, thereby enhancing the overall performance.
3. Use highly active fillers: such as nanopowder, which can effectively fill pores and increase density and strength.
2. Introduction of reinforced materials and application of composite technology
1. Introducing reinforcing materials: such as metal fibers, ceramic fibers or chopped fibers, etc., can significantly improve the tensile strength and crack resistance of castables. In particular, stainless steel fibers can form an orderly reinforcement network in the refractory castables through magnetic induction alignment technology.
2. Use composite aggregates and composite powders: Use the difference in linear expansion coefficient between aggregates and matrix to balance the strength and thermal shock resistance of the castables. For example, the combination of high-expansion aggregate and low-expansion matrix can significantly improve thermal shock resistance.
3. Process parameter control and additive use
1. Precisely control process parameters: such as mixing time, stirring speed, pouring temperature, etc., to ensure that various components are fully mixed, avoid local enrichment or separation, and improve the uniformity and performance of the castables.
2. Reasonable use of additives: Expansion agent: It can compensate for the shrinkage of castables at high temperatures and prevent cracks caused by thermal stress. Anti-oxidant: It can improve the antioxidant performance of castables and extend its service life. Dispersant: It can improve the rheological properties of castables and improve their workability. New superplasticizers, coagulants, etc.: help achieve lower porosity and higher strength.
4. Performance testing and evaluation
1. Establish a scientific and systematic testing method: accurately evaluate key performance indicators such as high-temperature strength, thermal shock resistance, and wear resistance of castables to provide a basis for formula design and process optimization of castables.
2. Continuous R&D and innovation: Continuously explore the application of new technologies and new materials, such as nanotechnology, intelligent response mechanisms, etc., to further improve the performance of refractory castables.
To sum up, improving the performance of refractory castables requires starting from many aspects such as material composition, structure, introduction of reinforcing materials, process parameter control, additive use, and performance testing and evaluation. The implementation of these measures can effectively improve the key properties of refractory material castables such as high-temperature strength, thermal shock resistance, and wear resistance, and meet the stringent requirements of modern industry for high-temperature materials.
