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A preparation method of ultra-high temperature oxidation-resistant graphite mold

A graphite mold, anti-oxidation technology, applied in the field of graphite mold processing, to achieve the effects of high strength, improved ultra-high temperature oxidation resistance, and extended service life

Active Publication Date: 2020-09-22
HENAN CHEM IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the technical problems existing in the existing graphite material anti-oxidation research, in order to overcome the defects existing in the current graphite mold, the purpose of the present invention is to provide a preparation method of ultra-high temperature oxidation-resistant graphite mold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A graphite mold anti-oxidation pretreatment agent, in terms of mass percentage, said graphite mold anti-oxidation pretreatment agent is composed of 15% aluminum dihydrogen phosphate, 2.5% aluminum nitrate, 2% sodium tetraborate decahydrate, 1.5% It is prepared from sodium fluoride, 0.8% phosphoric acid and the balance of water, and the sum of the mass percentages of each component is 100%. Wherein, the phosphoric acid is 85% industrial phosphoric acid.

[0041] The preparation method of the above-mentioned graphite mold anti-oxidation pretreatment agent is: according to the raw material composition of graphite mold anti-oxidation pretreatment agent, weigh aluminum dihydrogen phosphate, aluminum nitrate, sodium tetraborate decahydrate, sodium fluoride, phosphoric acid and water successively; Add aluminum dihydrogen phosphate, aluminum nitrate, sodium tetraborate decahydrate, and sodium fluoride into water, heat with constant stirring, heat up to 75°C, and dissolve at 75°...

Embodiment 2

[0043] A graphite mold anti-oxidation pretreatment agent, in terms of mass percentage, said graphite mold anti-oxidation pretreatment agent is composed of 10% aluminum dihydrogen phosphate, 2% aluminum nitrate, 1.5% sodium tetraborate decahydrate, 1% It is prepared from sodium fluoride, 1% phosphoric acid and the rest of water, and the sum of the mass percentages of each component is 100%. Wherein, the phosphoric acid is 85% industrial phosphoric acid.

[0044] The preparation method of the above-mentioned graphite mold anti-oxidation pretreatment agent is: according to the raw material composition of graphite mold anti-oxidation pretreatment agent, weigh aluminum dihydrogen phosphate, aluminum nitrate, sodium tetraborate decahydrate, sodium fluoride, phosphoric acid and water successively; Add aluminum dihydrogen phosphate, aluminum nitrate, sodium tetraborate decahydrate, and sodium fluoride into water, heat with constant stirring, heat up to 95°C, and dissolve at 95°C for 0...

Embodiment 3

[0046] A graphite mold anti-oxidation pretreatment agent, in terms of mass percentage, said graphite mold anti-oxidation pretreatment agent is composed of 20% aluminum dihydrogen phosphate, 4% aluminum nitrate, 3% sodium tetraborate decahydrate, 0.2% It is prepared from sodium fluoride, 0.4% phosphoric acid and the balance of water, and the sum of the mass percentages of each component is 100%. Wherein, the phosphoric acid is 85% industrial phosphoric acid.

[0047] The preparation method of the above-mentioned graphite mold anti-oxidation pretreatment agent is: according to the raw material composition of graphite mold anti-oxidation pretreatment agent, weigh aluminum dihydrogen phosphate, aluminum nitrate, sodium tetraborate decahydrate, sodium fluoride, phosphoric acid and water successively; Add aluminum dihydrogen phosphate, aluminum nitrate, sodium tetraborate decahydrate, and sodium fluoride into water, heat with constant stirring, heat up to 80°C, and dissolve at 80°C ...

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Abstract

The invention discloses a preparation method of a super-high temperature antioxidation graphite die. The method comprises the following steps: 1) cleaning a processed graphite die blank sample, dryingthe processed graphite die blank sample, and performing calcinations; 2) employing a graphite die antioxidation pretreatment agent for dipping the graphite die blank sample; 3) performing high-temperature solidification on the graphite die blank sample, 4) coating the surface of the graphite die blank sample with a silicon carbide slurry, after air drying, performing heat treatment on the graphite die blank sample, and cooling the graphite die blank sample to room temperature to prepare the graphite die blank sample having a silicon carbide transition layer; and 5) coating the surface of thegraphite die blank sample having the silicon carbide transition layer with a high-temperature ceramic paint, after air drying, performing heat treatment on the graphite die blank sample, and cooling the graphite die blank sample to room temperature to obtain the super-high temperature antioxidation graphite die. The super-high temperature antioxidation graphite die has the advantages of good thermal shock stability, high temperature resistance and antioxidation performance, and after usage for 200 h at the temperature of 2000 DEG C, the graphite die sample is intact.

Description

technical field [0001] The invention relates to the technical field of graphite mold processing, in particular to a preparation method of an ultra-high temperature oxidation-resistant graphite mold. Background technique [0002] Artificial graphite (referred to as graphite) has excellent electrical conductivity, thermal conductivity, self-lubricating properties, and high mechanical strength. Therefore, graphite materials are widely used in machinery, electronics, semiconductors, metallurgy, chemical industry and other fields, and have become important in modern industry. Special Engineering Materials. However, the outstanding weakness of graphite material is that it has poor high-temperature oxidation resistance and is prone to oxidation under high temperature conditions. Generally, the oxidation of graphite starts at 450°C, and when it exceeds 750°C, the oxidation and corrosion rate will increase sharply. Oxidation has a great influence on the mechanical properties of grap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
CPCC04B41/009C04B41/5018C04B41/85C04B41/5015C04B41/5009C04B41/5016C04B35/52
Inventor 刘玉林梁遂芳谢云漫张慧敏张羡王敬臣
Owner HENAN CHEM IND RES INST
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