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After 1100 ℃ x4h heat treatment, the linear change rate of the samples without chromium oxide was large(pink aluminium oxide), and the sample was swelling. The sample with chromium oxide was shrinkage, and the linear change rate decreased with the increase of chromium oxide(brown alumina abrasive). For the samples added with chromium oxide, the linear change rate increases with the increase of the amount of chromium oxide powder.

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The results show that the fracture strength and compressive strength of Cr2O3 and MgO are increased in turn with the increase of the amount of chromium oxide powder(220 grit aluminum oxide blast media). After the heat treatment at L100 ℃ x4h, the flexural strength and compressive strength of the samples increased gradually with the increase of the amount of chromium oxide(white fused aluminum oxide refractory), and a few aluminosilicate phases.

(low price calcined alumina manufacturers south africa)After 1600 ℃ x4h heat treatment, the mechanical properties of the samples were the best when the chromium oxide content was 1%(black silicon carbide powder). After 1600 ℃ x4h heat treatment, and the matrix around the particles is loose: there are many bubbles in Fig. In addition, there are mainly crystalline phases Ma and Ca2 in the matrix(brown fused alumina micropowder). in the slag are easily absorbed by MA (spinel) to form composite spinel.

With the increase of chromium oxide(carborundum grit suppliers), the more sharp rocks are produced in the sample, the slag resistance of c/ao, C2 and CS is tested by static crucible collapse method. The slag used in the experiment is taken from a steel plant, and its main components are MgO, 3.65%, Al2O3, 9.64%, SiO2, 21.35%, Fe2O3, 4.54%, Cao, 40.25%, Bao, 6.60%, MnO, 3.81%, TiO2, 1.12%, c/s=189(aluminum oxide blasting grit). in the slag.(low price calcined alumina manufacturers south africa)

The change rate of sample line is decreased due to the volume effect of magnesium chromium spinel(alumina polishing powder). B and C, and the glue with darker color indicates that the slag has eroded into the matrix. The results show that the samples without chromium oxide have corundum, cusp and glass phase in the wave passing layer(white aluminium oxide blasting media), which is due to the reaction of MgO with Al2O3 to form Ma and MA in matrix.

(low price calcined alumina manufacturers south africa)The spinel dense layer formed on the surface of the reaction layer plays a decisive role in inhibiting the penetration of the slag(carborundum powder). Cao reacts with Al O3 to form rod-like CaO-Al2O3 system compounds, which forms CAS around corundum particles. This is because Mg0 reacts with CR203 to produce magnesium chromium cusp after 1100 ℃ x4h heat treatment(aluminium oxide material for blasting). At the same time, FeO, Bao, SiO2, MnO, etc.

In addition, there are pores in figure a(green silicon carbide powder), spinel fines in the matrix are low active substances for Cao and SiO2 in steel slag, which is relatively stable and not easy to react with calcium and silicon in the steel slag phase. During the process of corrosion of the sample by steel slag, the Al-O in the sample will react with SiO2, FeO, Cao, MnO, etc(brown aluminum oxide grit). After 1600 ℃ x4h heat treatment, the sample shows expansion.(low price calcined alumina manufacturers south africa)