refractory castableChina-Canada silicon micropowder is to supplement the tiny pores and improve the strength performance of the castable through the precise particle size distribution of the ultrafine powder.
The strength of the refractory castable comes from the high alumina cement, and the CaO in the high alumina cement is up5％～8%. It will reduce the strength of refractory castable at medium temperature. If the amount of low melt is large at high temperature, it will also decrease.refractory castableHigh temperature performance; CaO in high alumina cement will produce hydration, the amount of water used will also increase after hydration, and more water will lead to loose castable structure. If ultra-fine powder is added, the amount of cement in the castable can be reduced to 6%, so that the CaO and water consumption in the high alumina cement can be reduced, thereby improving the strength of the castable. This is the importance of silica powder in refractory castables.
Silica powder is refractoryCastableEssential raw materials. The addition of silicon powder to the castable will increase the flow value of the castable. Silicon powder particle size is small, is a spherical particle, extremely easy to enter the castable tiny gap, so the addition of silicon powder has a good water reduction effect, but also can improve the fire resistanceCastableThe degree of density, reduce the porosity, so that the strength of the refractory castable is better.
Refractory effect after adding microsilicaCastableThe compressive strength also changes significantly at different temperatures. The initial strength is 110 ℃, the medium temperature strength is 1100 ℃, dueSiO2The relationship between the fineness activity of micropowder and refractory castablesCaOThe fluxing effect of other impurity components will produce a strong ceramic bond. When the high temperature strength is 1450 ℃, silica powder and alumina powder will form mullite at high temperature. Makesrefractory castableThe pores are reduced and the high temperature strength is better.
What, castable, refractory, strength, silica powder, pouring, reducing, material, cement, high temperature