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Zirconia-carbon refractory material for continuous casting and preparation method thereof

A refractory material, zirconium carbon technology, applied in the field of refractory materials, can solve the problems of easy agglomeration and growth, invasion of manufacturing channels, failure, etc., and achieve the effects of reducing high temperature elastic modulus, buffering thermal stress, and long service time

Active Publication Date: 2014-02-05
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the zirconia-carbon material recorded in the above-mentioned patent CN101970375A, the added ultra-fine graphite also has a tendency to be easily soluble in molten steel, and is easy to create channels for the intrusion of liquid slag; the metal catalyst used in the material to promote resin fiberization, In the process of heating, it is easy to agglomerate and grow up and fail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A zirconium carbon refractory material for continuous casting, the raw material is Y 2 o 3 Composed of stabilized zirconia, flake graphite, and molybdenum disilicide with a particle size of less than 50 μm, the mass percentage of raw materials is: Y 2 o 3 Stabilized zirconia 75%, 199 flake graphite 12.8%, 599 flake graphite 3.2%, molybdenum disilicide fine powder 9%; binder is thermoplastic liquid phenolic resin, the amount of thermoplastic liquid phenolic resin added is 3% of the total weight of raw materials, curing agent The addition of hexamethylenetetramine is 7% of the addition of thermoplastic liquid phenolic resin.

[0022] A kind of manufacture method of zirconium carbon refractory material for continuous casting, method step is as follows:

[0023] Step 1: After mixing molybdenum disilicide and 199 flake graphite according to the above ratio, put them into a premixer for premixing to make a mixed powder for later use;

[0024] Step 2: set Y 2 o 3 Stable ...

Embodiment 2

[0028] A zirconium-carbon refractory material for continuous casting. The raw material is composed of MgO stabilized zirconia of 0.074mm to 0.5mm, flake graphite, and molybdenum disilicide with a particle size of less than 50μm. The mass percentage of the raw material is: MgO stabilized zirconia 84%, 199 flake 6.6% graphite, 5.4% 599 flake graphite, 4% molybdenum disilicide fine powder; the binder is thermosetting liquid phenolic resin, and the amount of thermosetting liquid phenolic resin added is 10% of the total weight of raw materials.

[0029] A kind of manufacture method of zirconium carbon refractory material for continuous casting, method step is as follows:

[0030] Step 1: After mixing molybdenum disilicide and 199 flake graphite according to the above ratio, put them into a pre-mixer for pre-mixing to make a mixed powder for later use.

[0031] Step 2: Mix MgO stabilized zirconia, 599 flake graphite and thermosetting liquid phenolic resin, put MgO stabilized zirconi...

Embodiment 3

[0035] A zirconium carbon refractory material for continuous casting. The raw material is composed of MgO stabilized zirconia with a particle size of 0.074mm-0.5mm, flake graphite, and molybdenum disilicide fine powder with a particle size of less than 50μm. The mass percentage of the raw material is: MgO stabilized zirconia 80 %, 199 flake graphite 8%, 599 flake graphite 6%, molybdenum disilicide fine powder 6%, binder pitch addition is 6.5% of the total weight of raw materials.

[0036] A kind of manufacture method of zirconium carbon refractory material for continuous casting, method step is as follows:

[0037] Step 1: After mixing molybdenum disilicide and 199 flake graphite according to the above ratio, put them into a pre-mixer for pre-mixing to make a mixed powder for later use.

[0038] Step 2: Mixing MgO stabilized zirconia, 599 flake graphite and pitch, first put MgO stabilized zirconia in the kneader, add pitch and mix for 4 minutes, add 599 flake graphite accordin...

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Abstract

The invention relates to a thermal-shock resistant, corrosion resistant zirconia-carbon-containing refractory material which is mainly applied to a submersed nozzle used in steel-making and continuous casting. According to the zirconia-carbon refractory material, zirconia particles are combined with carbon to form a network structure; gaps of the network structure are filled with graphite with high heat conductivity to raise thermal shock resistance of the material; high-temperature metal plastic molybdenum disilicide with the surface coated with a dense silicon dioxide protective film is added to alleviate thermal stress of the material during the using process; and macrovoid ratio and contact area of melt cinder and zirconia in use are minimized to reduce washout and erosion of melt cinder to the zirconia-carbon refractory material. Total porosity of the material is less than 20%, wherein the volume fraction of pores with the size of below 10 microns is more than 85% of that of the total pores. The zirconia-carbon refractory material provided by the invention has good erosion resistance. Thermal shock resistance is not reduced. The zirconia-carbon refractory material will not be cracked or damaged when in use.

Description

technical field [0001] The present invention relates to a zirconia-carbon-containing refractory material resistant to shock and corrosion, in particular to a zirconium-carbon refractory material for continuous casting and its preparation method. The refractory material is mainly used in steelmaking and continuous casting submerged nozzle. Background technique [0002] In the continuous casting process of molten steel, a submerged nozzle is often used between the tundish and the mold to protect the molten steel from oxidation. A layer of mold slag should be sprinkled on the upper surface of the molten steel inside the mold to protect the upper surface of the molten steel inside the mold from being oxidized. At the same time, the mold slag also forms a layer of liquid film between the mold and the solidified steel to facilitate casting into billets. Mold flux is generally a low-melting substance containing CaO, SiO2, Na2O, K2O, Al2O3, CaF2, C, etc., so it is highly corrosive ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 马天飞刘国齐杨文刚于建宾钱凡
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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