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Al23O27N5-combined corundum composite slide plate and preparation method thereof

An al23o27n5, corundum-based technology, applied in the field of refractory materials, can solve the problems of reducing production costs, achieve the effects of reducing production costs, improving toughness and thermal shock resistance, and high chemical stability

Inactive Publication Date: 2013-07-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to prepare a kind of Al without immersion oil 23 o 27 N 5 The combined corundum composite slide plate not only overcomes the problem of carburization and carbon oxidation of molten steel by existing slide plate materials, but also simplifies the production process and greatly reduces the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: a kind of Al 23 o 27 N 5 The preparation method of the bonded corundum composite slide plate is as follows: 81% corundum, 15% activated alumina, 4% metal aluminum powder, and 3% thermosetting phenolic resin, in terms of weight percentage.

[0020] During production, first weigh various raw materials according to the proportion, mix them evenly, and get the mud material through mixing, and then press it into shape with a friction press, first dry it at 120-600°C for 12 hours, and then dry it at 120-600°C under nitrogen conditions High-temperature sintering for 9 hours; and then hooping, grinding, and coating to make the product of the present invention.

[0021] The powder is metal Al powder with a particle size of less than 325 mesh, activated alumina and part of corundum, and the aggregate is corundum with a particle size of 3-1mm or 1-0.1mm; the above-mentioned corundum is divided into tabular corundum and white corundum.

[0022] The performance inde...

Embodiment 2

[0023] Embodiment 2: production technology is identical with embodiment 1, and difference is:

[0024] In terms of weight percentage, the raw material composition is: 72% corundum, 20% activated alumina, 7% metal aluminum powder, 1% graphite, and 3% thermosetting phenolic resin. The performance index of the obtained product is: apparent porosity 8.3%, bulk density 3.18g / cm 3 , The normal temperature compressive strength is 243MPa, the high temperature flexural strength is 47MPa, and its thermal shock resistance, erosion resistance, and slag penetration resistance are all good.

Embodiment 3

[0025] Embodiment 3: production process is identical with embodiment 1, and difference is:

[0026] In terms of weight percentage, the raw material composition is: 63% corundum, 25% activated alumina, 10% metal aluminum powder, 2% graphite, and 3% thermosetting phenolic resin. The performance index of the obtained product is: apparent porosity 10.7%, bulk density 3.09g / cm 3 , The normal temperature compressive strength is 269MPa, the high temperature flexural strength is 53MPa, and its thermal shock resistance, erosion resistance and slag penetration resistance are all good.

[0027] Attachment 1

[0028] 1. 10.5Al 2 o 3 (s) + 4.5C(s) +2Al(l) + 2.5N 2 (g) = Al 23 o 27 N 5 (s)+ 4.5CO (g)

[0029] ΔG=688348-455.874T When T≥1510K, ΔG≤0;

[0030] 2. 10Al 2 o 3 (s) + 3C(s) + 3Al(l) + 2.5N 2 (g) = Al 23 o 27 N 5 (s) + 3CO(g)

[0031] ΔG=18498-165.599T When T≥112K, ΔG≤0

[0032] 3. 9.5Al 2 o 3 (s) + 1.5C(s) + 4Al(l) + 2.5N 2 (g) = Al 23 o 27 N 5 (s) + 1.5CO(g...

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PUM

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Abstract

The invention discloses an Al23O27N5-combined corundum composite slide plate and a preparation method thereof, belonging to the field of a refractory material. The slide plate consists of the following raw materials in percentage by weight: 55-85% of corundum, 5-30% of activated aluminum oxide, 1-15% of metal Al and 0-3% of carbon black and graphite; and phenolic resin accounting for 2-6% of the total weight of the raw materials is added as a bonding agent. The preparation method comprises the following steps of: weighing the raw materials according to the proportions, and mixing uniformly; mixing to obtain pug; performing compression moulding; drying at 120-600 DEG C for 5-25 hours; and then sintering in a nitriding atmosphere at 1,200-1,600 DEG C for 5-25 hours. The apparent porosity of the product disclosed by the invention is 4-13%, the volume density is 3.0-3.4g / cm<3>, the cold crushing strength is 150-280MPa, and the high temperature bending strength is 20-55MPa. The Al23O27N5-combined corundum composite slide plate has good erosion resistance and thermal shock resistance and low cost; the main components of the raw materials have high chemical stability and low oxygen potential; and secondary pollution caused by C, O, H and other impurities is avoided in clean steel continuous casting.

Description

technical field [0001] The invention relates to the preparation of a sliding plate for steelmaking and continuous casting, in particular to an Al alloy for clean steel continuous casting. 23 o 27 N 5 A combined corundum composite sliding plate and a preparation method thereof belong to the field of refractory materials. Background technique [0002] At present, the mainstream products of skateboards in modern iron and steel enterprises are aluminum-carbon and aluminum-zirconium-carbon skateboards, and the production process requires an oil immersion process. In recent years, clean steel has been developed rapidly. Conventional aluminum-carbon and aluminum-zirconium carbon slides cannot meet the needs of clean steel continuous casting due to the addition of carbon to molten steel. In addition, aluminum carbon and aluminum zirconium carbon slides have the problem of carbon oxidation during use. Carbon oxidation causes the structure of the slide to be loose, allowing oxides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 李勇张军杰
Owner UNIV OF SCI & TECH BEIJING
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