There are differences between low cement castables and CA-50 castables, not only in terms of process, use temperature, construction water amount, but also various indicators.
1. Differences in construction
The difference in construction between low cement castables and CA-50 castables is the amount of water added. The amount of water added for low-cement castables is 5-7%, while the amount of water added for CA-50 materials is about 15%. Due to the large amount of water added to the CA-50 material, there are also many structural pores. Low-cement materials add less water, have a higher volume density, and have a denser organizational structure.
The medium temperature strength is the most embarrassing temperature of the castable, because at this temperature, the castable strength, the two castables also have a big difference in the temperature strength. The low cement castable is due to the addition of silica fume and high grade refractory cement. This not only offsets the volume shrinkage of the castable, but also increased the medium-temperature strength instead of decreasing. The medium-temperature strength of the CA50 material is the fatal weakness, and the strength will be significantly weakened at 800°C.
2. The difference in temperature
The castable is a molded body, and the size of the pores directly affects the performance of the castable. The low cement castable has less total pores, uniform distribution of small capillary pores, and good corrosion resistance. The amount of pores in the CA-50 castable at a temperature of 800°C The corrosion resistance is 25% lower than that of low cement materials. Especially at a temperature of 1400°C, the slag and wear resistance of low-cement materials are higher than those of CA-80 materials. Because less cement is added to low-cement castables, the calcium content is reduced. Low calcium content produces less low-melting materials, and the later use intensity is also high, which will virtually increase its service life.
3. Differences in corrosion resistance
After these two castables are dried at high temperature of 1400°C, the flexural resistance of the low cement castable is twice as high as that of the CA-50 castable, and the refractoriness will be 20-100°C higher than that of the CA-50 castable. Therefore, the use temperature is lower The cement material is 100°C higher than the CA-50 material. The thermal shock resistance of these two materials, after water cooling cycle at 1100℃, the low cement material has better thermal shock than the CA-50 material, and the erosion resistance differs by about 25%.
There is a big difference between these two castables. In actual production, the production volume of CA-50 castables is basically much different than that of low cement castables. Some castable manufacturers produce aluminum silicate series castables. materials, almost exclusively producing low-cement castables.
