Matrix composition. The matrix composition has a crucial impact on the application temperature, high-temperature mechanical function, and sintering function of refractory castables. The matrix should mainly consist of low K2O and Na2O content bauxite clinker, control the amount of cement involved, optimize the ingredients, and make the matrix of refractory castables approximate the chemical composition of mullite (A3S2). That is, adjust the content of Al2O3 and SiO2 in the matrix to generate mullite at temperature and cause slight volume expansion, To enhance thermal shock resistance and high-temperature strength
High strength and high aluminum castable
Fusion agent. Pure calcium aluminate cement is used as the fusion agent, and its key component is CaO. Al2O3 calcium aluminate has a decomposition temperature of 1600 ℃, high activity, normal agglutination rate, fast hardening rate, high initial strength, and unclear increase in later strength; The rate of hydration and hardening is relatively slow, with low initial strength and later strength.
After the hydration and agglomeration of the cement, it is advisable to bond the aggregate and powder together with a participation amount of less than 5% Participate in an appropriate amount of micro powder
Dispersant. Participated in an appropriate amount of dispersant (water reducing agent can increase the dispersion of micro powder particles in the casting material, increase the distance between particles, and reduce gravity and friction force)
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