A kind of sintered zirconium corundum refractory raw material and preparation method thereof

Abstract

The invention relates to a sintered fused alumina zirconia refractory raw material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: placing alumina powder into a ball forming mill, and spraying ball forming liquid to obtain blank balls being 18-28mm in diameters, wherein the mass ratio of the alumina powder to the ball forming liquid is 1:(0.16-0.22); introducing the blank balls into a drying chamber of a high-temperature shaft kiln, drying at the temperature of 450-650 DEG C for 70-100 minutes, introducing the dried blank balls into a burning chamber of the high-temperature shaft kiln, preserving heat at the temperature of 1,850-1,900 DEG C for 25-45 minutes, cooling along with the kiln, smashing, sieving and packaging to obtain the sintered fused alumina zirconia refractory raw material. A preparation method of the ball-forming liquid comprises the following steps: preparing 86-92 percent by weight of zirconium oxychloride, 4-9 percent by weight of calcium salt or magnesium salt, 1-6.5 percent by weight of yttrium chloride and 0.5-3 percent by weight of cerium chloride to serve as raw materials; adding water into the raw materials in a solid-liquid ratio of 40-120g / L; stirring till clarification. The sintered fused alumina zirconia refractory raw material is low in cost, is suitable for industrial production, is uniform in structure and has superior thermal shock stability.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials. Specifically relates to a sintered zirconium corundum refractory raw material and a preparation method thereof. Background technique [0002] Corundum refractory materials are widely used in steel, casting, ceramics and other industries due to their excellent high-temperature properties, and their application in the steel industry almost covers the entire process of iron-making and steel-making. However, in some parts with harsh working environments, it is still urgent to further improve the thermal shock resistance of corundum refractory materials. [0003] In recent years, scholars from various countries have proposed ZrO 2 Different toughening mechanisms mainly include: 1) phase transformation toughening mechanism; 2) micro-crack toughening mechanism; 3) dispersion toughening mechanism. According to the above ZrO 2 In the field of ceramics, zirconia toughened alumina ...

AI Technical Summary

Problems solved by technology

However, the current production of fused zirconia corundum refractory raw materials has the following main problems: 1) The preparation process consumes a lot of energy, and ZrO 2 The amount of addition is large, which makes the preparation cost of raw materials higher; 2) ZrO in raw materials 2 The grain size is relatively large (generally above 50 μm), and the distribution is uneven, so ZrO cannot be fully utilized 2 Toughening effect