By adding modified resin, the medium and low temperature strength of the sample after burning in the carbon and air conditions can be significantly improved, but the strength of the sample after burning in the carbon buried atmosphere at different temperatures is higher than that after the air atmosphere at the same temperature. The addition of modified resin has a slightly negative effect on the oxidation resistance of the material, possibly because the modified resin has an unfavorable effect on the molding performance and the higher porosity. The use effect of the new skateboard with modified resin is obviously better than that of ordinary non-burning skateboard, and the continuous sliding rate is increased from 1.3 times to 2.2 times. Combined with the chemical composition of aluminum-titanium slag in a ferroalloy plant, the aluminum-titanium slag and active lime are compounded according to the ratio of alumina to calcium oxide in the theoretical composition of calcium hexaaluminate.
Put the basic formula 87.0% aluminum titanium slag and 13.0% active lime in a high-speed grinder and grind for 1h. Add the ground material to 5% water, mix at low speed for 20min, use active lime to hydrate to form lime milk as a binder, It is formed by semi-dry method with a molding pressure of 50MPa. After molding, the samples are dried at 110 ℃ for 2h, and then fired at 1400 ℃, 1450 ℃ and 1500 ℃ for 2h. The sample numbers are No. 1 ~ No. .3. The microstructure and structure morphology of the fractures of samples after calcination at different temperatures were observed with JEJSM6480LV SEM scanning electron microscope. The Archimedes method was used to measure the bulk density and apparent porosity of the burned samples.
Analysis test of phase composition of calcium hexaaluminate material By XRD method, the phase composition of calcium hexaaluminate material synthesized by calcination temperature versus solid phase reaction was comparatively analyzed. The main mineral composition of each formula sample includes the main crystal phase calcium hexaaluminate phase and a small amount of corundum phase. With the increase of the calcination temperature, the intensity of the diffraction peak of the calcium hexaaluminate phase gradually increases.
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