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Low-zirconium-content sintered tabular corundum and preparation method thereof

A technology of platy corundum and zirconium content, applied in the field of refractory materials, can solve the problems of uneven distribution, high preparation cost, large grain size, etc., and achieve the effect of simple process operation, simple preparation process and good thermal shock stability

Active Publication Date: 2018-08-28
浙江自立新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The preparation process consumes a lot of energy, ZrO 2 The addition amount is large, generally higher than 20wt%, which makes the preparation cost of the material higher;
[0006] 2) ZrO in fused zirconia corundum 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

Method used

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  • Low-zirconium-content sintered tabular corundum and preparation method thereof
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  • Low-zirconium-content sintered tabular corundum and preparation method thereof

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Embodiment 1～6

[0035] A method for preparing sintered tabular alumina with low zirconium content, comprising the steps of:

[0036] (1) Put industrial alumina powder and monoclinic zirconia powder in different silos, and each silo is connected to the ball mill through its own pipeline. The feed quality of industrial alumina powder and monoclinic zirconia powder is such as Table 1 shows.

[0037] The main component of industrial alumina is γ-alumina, and the mass fraction of each component in industrial alumina powder is Al 2 o 3 ≥98.0%, SiO 2 ≤0.10%, CaO≤0.15%, Fe 2 o 3 ≤0.1%, Na 2 O≤0.5%.

[0038] Table 1, 2μm monoclinic zirconia powder, D 50 =1.8-2.3μm, ZrO 2 Mass fraction>99.0%; in 10μm monoclinic zirconia powder, D 50 =10-15μm, ZrO 2 Mass fraction > 98.5%.

[0039] (2) Industrial alumina powder and monoclinic zirconia powder are ground in a ball mill, and the grinding time is shown in Table 1.

[0040] (3) After grinding, put it into the ball forming tray, and spray water int...

Embodiment 4

[0062] The electron microscope figure of embodiment 4 is as figure 1 shown, from figure 1 It can be seen that the average size of corundum grains is 30-40 μm, and the white area is ZrO 2 Grains, ZrO 2 The grain size is 1.0--9μm, ZrO 2 The grain size is uniform, and the ZrO2 grains are evenly distributed in the junction of corundum grains and grains.

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Abstract

The invention discloses low-zirconium-content sintered tabular corundum and a preparation method thereof. The preparation method comprises the following steps that industrial alumina powder and monoclinic zirconia powder are mixed according to a mass ratio of 1:0.05-0.16 and sintered for 2.5-3.5 hours at a temperature of 1700-1800 DEG C after grinding and balling are carried out in sequence to obtain the low-zirconium-content sintered tabular corundum. The grain sizes of the monoclinic zirconia powder are 2 micrometers and / or 10 micrometers. The prepared low-zirconium-content sintered tabularcorundum has the advantages that the thermal shock stability is good, preparation process is simple, the cost is low, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to sintered tabular alumina with low zirconium content and a preparation method thereof. Background technique [0002] Thermal shock stability is one of the most important performance indicators of refractory materials, especially for products such as skateboards or ladle bricks. Due to the frequent changes in temperature, the products are prone to cracks and cannot be used continuously. Improve the thermal shock stability of refractory materials Sex is the only solution. [0003] In the prior art, the thermal shock stability of sintered tabular alumina is better due to the many closed micropores inside the crystal grains, but it still does not meet the requirements for use. Therefore, many refractory manufacturers will choose to add Partially fused zirconia corundum to improve the thermal shock stability of refractories. [0004] However, there are the following problems in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/106
CPCC04B35/106C04B2235/5436C04B2235/77C04B2235/96
Inventor 陈要生赵义马铮李媛媛宋雅楠
Owner 浙江自立新材料股份有限公司
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