Refractory Damage Resistance
Refractory material damage resistance. Refractory material damage resistance refers to the reliability and service life of refractory materials, products and components during use, and is the ability of refractory materials to resist various damage factors. Russian researchers conducted a systematic study of the causes and ways of improvement of refractory materials, and illustrated the maximum service life of various industrial kilns after the use of optimally designed refractories. The destruction of refractories is divided into 8 basic types: (1) slag erosion (about 70% of the total damage amount) caused by the chemical action of refractories and slag, molten metal or other melt, ash, gas, etc. (2) Thermal exfoliation caused by temperature fluctuations (about 20% of the total damaged volume); (3) Loose structure caused by polycrystalline transformation and thermal expansion; (4) Caused when the use temperature exceeds its softening point or refractoriness Melting; (5) Thermoplastic damage occurring when the use temperature reaches 50% of the melting temperature of 70%; (6) Mechanical damage caused by molten metal erosion; (7) Sublimation of refractory materials in vapor phase media or vacuum; (8) The mechanical wear of the refractory on the heated solid workpiece.
The main ways to improve the damage resistance of refractories are: (1) to improve the chemical stability of each component to improve the slag resistance of the material; (2) to increase the phase composition of refractory materials and increase the firing temperature of refractory products to limit the thermoplasticity (3) increase the degree of densification of refractory materials and use of thermodynamically stable components to reduce the sublimation of refractory materials; (4) introduce cross-growth of high-hardness crystalline materials into the structure of refractory materials. Improve the ability to resist the erosion of molten metal; (5) The use of materials with high wear resistance can solve the problem of mechanical wear of refractory solid objects that are heated. With the use of optimised refractories, some industrial kilns have reached their maximum useful life.
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