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According to the analysis of alloy elements, the mechanism of MgO has three views(brown aluminium oxide): the theory of surface diffusion enhancement, MgO can improve the grain boundary migration rate, thus directly accelerating the Sintering Densification of Al2O3 materials. MgO can change the intrinsic grain growth track and densification rate of alumina(80 grit aluminum oxide), promote sintering and inhibit abnormal grain growth (AGG). 

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The mechanism of action of different kinds of additives was analyzed and discussed according to the types of compounds(glass beads manufacturers). Cao, Bao, SrO2 and other oxides mainly form a liquid phase at the grain boundary, make the grain size smaller under the same sintering conditions, which can co melt with alumina at the grain boundary at a lower temperature(white alumina powder), and can also co melt with SiO2 at a lower temperature to produce a liquid phase and promote sintering.

Mg0 and Al2O3 form solid solution at high temperature, and wrap on the surface of Al2O3 grain, improve the wetting behavior of grain boundary phase(garnet abrasive price), reduce the moving speed of product boundary, so as to inhibit the excessive growth of grain and prevent the grain boundary from passing through the pores(aluminium oxide sandblasting). A-Al2O3 nano powder was prepared by direct calcination and decomposition of trivia, such as fluoride ZnF2, aif3 and so on.

Therefore, adding MgO can generally obtain dense fine grain structure(brown fused alumina). Erkalfal believes that the diffusion mechanism is due to the addition of MnO2, and that the grain boundary diffusion dominates the bulk diffusion. The addition of MgO can also effectively block the volatilization of colorant(aluminium oxide grit suppliers). Since Coble first reported that 0.25% MgO can promote Sintering Densification, many researchers have studied MgO.

MgO uniformly adsorbs on the surface of a-Al2O3 crystal and produces mgal2o3 spinel (mgal2o3). Spinel is formed on the grain boundary(glass bead abrasive), strengthening the structural force between the grain boundary phase and a-Al2O3 grain and improving the intergranular binding force. Therefore, the hardness of corundum abrasive increases and the wear resistance is improved(artificial corundum). In the corundum with Cao, the spinel increases with the increase of MgO content.

The thermal expansion coefficient (7.6x10k) of spinel is close to that of corundum (7.2x10k1), so the microcracks caused by the formation of calcium feldspar can be reduced(brown aluminum oxide). For example, MnO2, Fe2O3, Co3O4, NiO and Cr2O3 have obvious vapor pressure at low temperature, and MgO can form spinel phase with these colorants(aluminium oxide blasting). It should be noted that the excessive addition of MgO is not good for the sintering of corundum.

For example, when Al2O3 is sintered, adding 2% MgO can reduce the activation energy of Al2O3 sintering to 398kj / mol(steel shot abrasive), which is lower than the activation energy of 502kj / mol of pure Al2O3, thus promoting sintering; when adding 5% MgO, the activation energy of Al2O3 sintering is increased to 545kj / mol, but inhibiting Al2O3 sintering(220 grit aluminum oxide). The effect of ZrO2 on high alumina ceramics is mainly in toughening, while the calcium feldspar decreases.