Graphite crucible for vacuum smelting of intermediate frequency furnace and preparation method thereof

A technology for vacuum smelting and graphite crucibles, which is applied in the directions of crucible furnaces, furnaces, furnace types, etc., can solve the problems of low yield and low strength of graphite crucibles, achieve high yield, improve compressive strength and flexural strength, and improve finished products. the effect of improving adhesion and dispersion properties

Inactive Publication Date: 2020-04-24
JIZHOU CHANGAN ELECTRODE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a graphite crucible for vacuum smelting in an intermediate frequency furnace and its preparation method, which solves the problems of low strength and low yield of graphite crucibles in the prior art

Method used

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  • Graphite crucible for vacuum smelting of intermediate frequency furnace and preparation method thereof
  • Graphite crucible for vacuum smelting of intermediate frequency furnace and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A graphite crucible for vacuum smelting in an intermediate frequency furnace, comprising the following components in parts by weight:

[0036] 7 parts of needle coke with a particle size of 4-6 mm, 8 parts of needle coke with a particle size of 2-4 mm, 20 parts of needle coke with a particle size of 0-2 mm, 26 parts of needle coke powder, and 7 parts of Sangao graphite. 15 parts of asphalt,

[0037] Among them, needle coke powder is obtained by crushing needle coke and passing through a 200-mesh sieve; Sangao graphite is high-density, high-purity, high-strength graphite with a density of 1.85g / cm 3 , fixed carbon content ≥ 99.9%, flexural strength ≥ 25MPa, compressive strength ≥ 50MPa; the preparation method of modified asphalt is: crush 70 parts of asphalt through a 200-mesh sieve to obtain asphalt powder, and dissolve the asphalt powder in tetrahydrofuran solvent To obtain the tetrahydrofuran solution of asphalt, add 13 parts of nano-silica, 5 parts of chromium oxide...

Embodiment 2

[0046]A graphite crucible for vacuum smelting in an intermediate frequency furnace, comprising the following components in parts by weight:

[0047] 9 parts of needle coke with a particle size of 4-6 mm, 10 parts of needle coke with a particle size of 2-4 mm, 25 parts of needle coke with a particle size of 0-2 mm, 35 parts of needle coke powder, and 12 parts of three-high graphite. 25 parts of asphalt,

[0048] Among them, needle coke powder is obtained by crushing needle coke and passing through a 200-mesh sieve; high graphite is high-density, high-purity, high-strength graphite with a density of 1.85g / cm 3 , fixed carbon content ≥ 99.9%, flexural strength ≥ 25MPa, compressive strength ≥ 50MPa; the preparation method of modified asphalt is: crush 70 parts of asphalt through a 200-mesh sieve to obtain asphalt powder, and dissolve the asphalt powder in tetrahydrofuran solvent To obtain the tetrahydrofuran solution of asphalt, add 13 parts of nano-silica, 5 parts of chromium ox...

Embodiment 3

[0051] A graphite crucible for vacuum smelting in an intermediate frequency furnace, comprising the following components in parts by weight:

[0052] 8 parts of needle coke with a particle size of 4-6 mm, 9 parts of needle coke with a particle size of 2-4 mm, 23 parts of needle coke with a particle size of 0-2 mm, 30 parts of needle coke powder, and 10 parts of Sangao graphite. 20 parts of asphalt,

[0053] Among them, needle coke powder is obtained by crushing needle coke and passing through a 200-mesh sieve; Sangao graphite is high-density, high-purity, high-strength graphite with a density of 1.85g / cm 3 , fixed carbon content ≥ 99.9%, flexural strength ≥ 25MPa, compressive strength ≥ 50MPa; the preparation method of modified asphalt is: crush 70 parts of asphalt through a 200-mesh sieve to obtain asphalt powder, and dissolve the asphalt powder in tetrahydrofuran solvent To obtain the tetrahydrofuran solution of asphalt, add 13 parts of nano-silica, 5 parts of chromium oxid...

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Abstract

The invention belongs to the technical field, and provides a graphite crucible for vacuum smelting of an intermediate frequency furnace and a preparation method thereof. The graphite crucible comprises the following components in parts by weight: 7-9 parts of needle coke with the granularity of 4-6mm, 8-10 parts of needle coke with the granularity of 2-4mm, 20-25 parts of needle coke with the granularity of 0-2mm, 26-35 parts of needle coke powder, 7-12 parts of graphite and 15-25 parts of modified asphalt. The modified asphalt is prepared from the following components in parts by weight: 60-80 parts of asphalt, 10-15 parts of nano silicon dioxide, 2-7 parts of chromic oxide, 1-5 parts of polyvinyl alcohol and 0.5-3 parts of sodium oleate. The preparation method of the graphite crucible comprises the following steps: performing dry mixing on the needle coke with the particle size of 4-6mm, the needle coke with the particle size of 2-4mm, the needle coke with the particle size of 0-2mm,needle coke powder and three-high graphite, adding modified asphalt, performing wet mixing to obtain paste, and performing crushing, compression molding, roasting, graphitization and the like on thepaste to obtain the graphite crucible. By means of the technical scheme, the problems that in the prior art, the graphite crucible is not high in strength and low in yield are solved.

Description

technical field [0001] The invention belongs to the technical field of graphite crucibles, and relates to a graphite crucible for vacuum smelting in an intermediate frequency furnace and a preparation method thereof. Background technique [0002] Graphite crucible is made of natural flake graphite as the main raw material and plastic refractory clay or carbon as binder. It has the characteristics of high temperature resistance, strong thermal conductivity, good corrosion resistance and long service life. In the process of high temperature use, the coefficient of thermal expansion is small, and it has certain strain resistance to rapid cooling and rapid heating. It has strong corrosion resistance to acidic and alkaline solutions, has excellent chemical stability, and does not participate in any chemical reactions during the smelting process. The inner wall of the graphite crucible is smooth, and the melted metal liquid is not easy to leak and adhere to the inner wall of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/622F27B14/06F27B14/10
CPCC04B35/522C04B35/532C04B35/622C04B2235/3241C04B2235/3418C04B2235/5276C04B2235/5427C04B2235/6562C04B2235/77C04B2235/96F27B14/06F27B14/10
Inventor 王兴禄孟双林王秋生张玉珠吴秋娜段增亮李框正
Owner JIZHOU CHANGAN ELECTRODE
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