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Macrocrystalline sintered plate-shaped corundum and preparation method thereof

A tabular corundum and crystallization technology, applied in the field of refractory materials, can solve the problem of not meeting the use requirements of high-end products, and achieve the effects of good wear resistance, improved wear resistance and good wear resistance.

Inactive Publication Date: 2018-05-22
浙江自立新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, the bulk density of sintered tabular alumina commonly seen on the market is generally 3.50-3.60g / cm 3 Among them, the apparent porosity is generally between 3.0 and 5.0%, which cannot meet the needs of some applications, and the grain size is generally around 40 μm, which cannot meet the requirements of high-end products.

Method used

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  • Macrocrystalline sintered plate-shaped corundum and preparation method thereof
  • Macrocrystalline sintered plate-shaped corundum and preparation method thereof
  • Macrocrystalline sintered plate-shaped corundum and preparation method thereof

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Embodiment 1～7

[0038] A method for preparing large crystal sintered tabular alumina, the process flow of which is as follows:

[0039] (1) The industrial alumina powder is pretreated at high temperature, and the pretreatment temperature and pretreatment time of the industrial alumina powder are shown in Table 1. In the product after high temperature treatment, the weight percentages of each component are respectively: Al 2 o 3 ≥99.0%, SiO 2 ≤0.05%, CaO≤0.08%, Fe 2 o 3 ≤0.06%, Na 2 O≤0.4%.

[0040] In the present invention, unless otherwise specified, percentages are percentages by weight.

[0041] (2) Grinding

[0042] Put the product after the high-temperature treatment in step (1) into a grinder and grind it. The ball ratio (mass ratio) during grinding is large ball (diameter 60mm): small ball (diameter 40mm) = 1: 4.5, feed amount It is 120kg / h, the speed of the classifier is 1000r / min, and the output product particle size is controlled at -45μm≥90wt% (that is, the powder with a ma...

Embodiment 1

[0077] The electron microscope picture of the sintered tabular alumina prepared in Example 1 is as follows figure 1 As shown, the grain size is 350 μm, and there are a large number of micropores with diameters below 10 μm inside the grains.

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Abstract

The invention discloses macrocrystalline sintered plate-shaped corundum and a preparation method thereof. The preparation method of the macrocrystalline sintered plate-shaped corundum comprises the following steps: treating industrial aluminum oxide powder at the temperature of 1100 to 1300 DEG C for 3 to 5h; grinding, pelleting, drying, sintering and cooling a product in sequence to obtain the macrocrystalline sintered plate-shaped corundum. 90 weight percent or more of ground powder can pass through a sieve with the size of 325 meshes. In a pelleting process, at least one of water, an ammonium chloride water solution, an ammonium fluoride water solution, a boric water solution and an aluminum fluoride water solution is used as a pelleting solution. By adopting the preparation method provided by the invention, the macrocrystalline sintered plate-shaped corundum with the grain diameter size of 300 to 500mu m can be prepared, the volume density reaches 3.70g / cm<3> or more and the apparent porosity is less than 3.0 percent; the wear resistance, the thermal shock resistance stability and the slag corrosion resistance of a fireproof product are improved.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a large crystal sintered tabular alumina and a preparation method thereof. Background technique [0002] As an ultra-high temperature refractory material, tabular alumina has the characteristics of high purity, low alkali, high density, high strength, high thermal conductivity, high shock resistance, good corrosion resistance, and high insulation. It is mainly used as the aggregate of advanced refractory materials And powder, used in shaped and unshaped refractory materials, where fused white corundum, sub-white corundum, and brown corundum are used, they can be replaced by tabular corundum, and the product performance is significantly improved. [0003] Tabular alumina is mainly used in: metallurgy, chemical industry, electronics, ceramics, high temperature kiln, abrasive mold and other industries. Fused corundum is an industry with high energy consumption and high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10
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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