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Silicon carbide bonded carbon-containing fireproof material and preparation method thereof

A technology of aluminum-carbon refractory materials and refractory materials, which is applied in the field of silicon carbide combined with carbon-containing refractory materials, can solve the problems of easy peeling off molten metal, loss of bonding force of materials, poor oxidation resistance, etc., achieve excellent oxidation resistance and improve oxidation resistance performance, good thermal shock resistance

Active Publication Date: 2014-06-18
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this glassy bonded carbon has two disadvantages: first, it has poor oxidation resistance. The glassy carbon formed after carbonization of phenolic resin begins to oxidize and ablate from 500°C. The oxidation of bonded carbon will cause the material to lose its bonding force and the structure becomes Loose, easy to peel off or be eroded by molten metal; second, low strength, glass brittleness, brittle fracture will occur under certain stress
Some asphalt-impregnated carbon-containing refractory materials are difficult to apply anti-oxidation coatings due to smooth surfaces and limitations in use conditions, and carbon-bonded oxidation occurs easily during baking

Method used

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  • Silicon carbide bonded carbon-containing fireproof material and preparation method thereof

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Embodiment 1

[0025] A silicon carbide bonded aluminum-carbon refractory material for continuous casting, the raw material is composed of alumina aggregate, flake graphite, and alumina powder; the particle size of alumina aggregate is 0.074mm-0.5mm, and the flake graphite is 199 flake graphite and 599 Flake graphite and alumina powder use α-alumina micropowder with a particle size of 3-5 μm; the mass percentage of raw materials is: alumina aggregate 60%, 199 flake graphite 10%, 599 flake graphite 6%, alumina powder 24% The binding agent is polycarbosilane in solid state, the addition of polycarbosilane is 8% of the total weight of raw materials, and the addition of solvent gasoline is 50% of polycarbosilane.

[0026] A method for manufacturing silicon carbide combined with aluminum-carbon refractory for continuous casting, the method steps are as follows:

[0027] Step 1: After mixing alumina powder with 199 flake graphite and 599 flake graphite according to the above ratio, put them into a...

Embodiment 2

[0032] A silicon carbide combined with magnesia carbon refractory material for continuous casting, the raw material is composed of magnesia, flake graphite, and magnesium oxide powder; The powder is fine powder with particle size less than or equal to 44μ. The mass percent of raw material is: magnesia 61%, 199 flake graphite 8%, 599 flake graphite 6%, magnesia powder 25%; Binding agent is liquid polycarbosilane, and liquid polycarbosilane addition is 12% of raw material gross weight. %, solvent ethylene dichloride addition is 40% of polycarbosilane.

[0033] A kind of manufacture method of silicon carbide combined magnesium carbon refractory material for continuous casting, method steps are as follows:

[0034] Step 1: After mixing magnesium oxide powder with 199 flake graphite and 599 flake graphite according to the above ratio, put them into a premixer for pre-mixing to make a mixed powder for later use.

[0035] Step 2: After mixing polycarbosilane and dichloroethane, mix...

Embodiment 3

[0039] A silicon carbide bonded zirconium carbon refractory material for casting, the raw material is composed of MgO stabilized zirconia aggregate, flake graphite, and zirconia powder; the particle size of MgO stabilized zirconia aggregate is 0.1mm-0.5mm, and the flake graphite is For flake graphite and 599 flake graphite, zirconia powder is fine powder with particle size less than or equal to 44μ. The mass percentage of raw materials is: 57% of MgO stabilized zirconia, 8% of 199 flake graphite, 2% of 599 flake graphite, 33% of zirconia powder, the amount of binder liquid polycarbosilane is 10% of the total weight of raw materials, solvent two The addition of ethyl chloride is 30% of polycarbosilane.

[0040] A kind of manufacture method of zirconium carbon refractory material for continuous casting, method step is as follows:

[0041] Step 1: After mixing the zirconia powder with 199 flake graphite and 599 flake graphite according to the above ratio, put them into a pre-mix...

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Abstract

The invention relates to a carbon-containing fireproof material with excellent oxidation resistance and high intensity. The fireproof material comprises an aluminum-carbon fireproof material, a magnesium-carbon fireproof material and a zirconium-carbon fireproof material. The fireproof material is mainly applied to an inner lining of a smelting furnace, a molten metal flow guiding pipe or a flow controller during metallurgy and casting. During preparation of the carbon-containing fireproof material, polycarbosilane is used as a bonding agent, and a cracking reaction is performed during a sintering process to generate silicon carbide fibers and to form a silicon carbide bonded component. The silicon carbide bonded component has better oxidation resistance than a resin carbon bonded component and has a quite high bonding strength with fireproof aggregates; in addition, bonded carbon formed after the silicon carbide fibers and phenolic resin are carbonized has similar thermal conductivity and thermal expansion coefficients, so the silicon carbide bonded carbon-containing fireproof material has thermal shock resistance equivalent to the thermal shock resistance of a resin carbon bonded carbon-containing fireproof material. The polycarbosilane is a polymer which can be pyrolyzed to obtain the silicon carbide and comprises a main chain or branched chains mainly containing Si and C, and the amount of the added polycarbosilane is 8-12 percent of the weight of raw materials.

Description

technical field [0001] The invention relates to a silicon carbide bonded carbon-containing refractory material with excellent oxidation resistance and high strength. The refractory material is mainly used in furnace linings, molten metal guides and flow controllers in metallurgy and casting processes. Background technique [0002] In the metallurgical process, the furnace lining, molten steel diversion, and flow controller are often subject to sudden temperature changes, and the refractory materials used in these parts are required to have high thermal shock resistance. Graphite-containing refractory materials (referred to as carbon-containing refractory materials) are widely used in metallurgical processes because graphite can quickly conduct heat when the ambient temperature changes drastically, reduce the internal temperature gradient of the material, and reduce thermal stress, thereby protecting the material from thermal shock and cracking. Parts with strong heat shock. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 马天飞王刚刘国齐杨文刚于建宾钱凡
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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