The components of the additive are compatible with the glass component and can simultaneously react with the host material Cr2O3 to promote the formation of Fluorenker and Schottky thermal defects inside and on the surface of the Cr2O3 crystal in the heated state, activating the lattice material of the host material. Accelerate the process of mass diffusion and surface diffusion of particles in the firing process. Some components of the additive react with Cr2O3 to form a solid solution, which is crystallized from the melt and deposited at the grain boundary of the Cr2O3 crystal grain to form a ring-shaped crystal band, thereby controlling the growth of the Cr2O3 crystal grain and strengthening the intergranular phase of the crystal. Combined to improve the strength of the product. Based on the above considerations, many additives were selected for the experimental study. Here, two representative additives were selected for comparison. One was additive A, and the other was composite additive B.
The effect of additives on product performance. The sintering of Cr2O3 materials can be significantly promoted at lower temperatures, and products with physical and chemical indexes that meet or exceed similar advanced products can be obtained. In order to make Cr2O3 fully sintered at a lower temperature, two technologies are adopted: (1) Cr2O3 fineness is increased as much as possible without affecting the yield of finished products. Because the finer the particle size, the greater the degree of distortion and radius of curvature of the crystal grains, the higher the material activity and the greater the self-diffusion capability; (2) The introduction of an additive with an ion radius similar to the Cr3+ radius makes it suitable. Sintering within the oxygen partial pressure range forms a continuous solid solution and a finite solid solution, destroying the ordered arrangement of Cr atoms, resulting in a change in the potential field around the introduced atoms, thereby causing distortion of the periodic potential field within the Cr2O3 crystal and accelerating the self-diffusion of chromium ions. Promote the sintering of Cr2O3 materials.
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