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Silicon carbide composite refractory product containing rare earth oxide

A technology of rare earth oxides and refractory products, applied in the field of refractory materials, can solve the problems of difficult to form effective chemical bonding and mutual non-wetting, achieve excellent abnormal temperature/high temperature mechanical strength, slow down the oxidation process, and promote the effect of sintering densification

Active Publication Date: 2020-09-04
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon carbide is covalently bonded, while calcium hexaaluminate\magnesium aluminum spinel is an oxide bonded by ionic bonds, which means that the two do not wet each other and it is difficult to form an effective chemical bond

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh separately w (La 2 o 3 ) ≥ 99%, 1 kg of lanthanum oxide fine powder with particle size less than or equal to 60 μm, w (Al 2 o 3 +MgO)=99.0%, particle size ≤0.1mm and fused magnesia-aluminum spinel fine powder with 95% spinel phase, 24kg, mixed for 6h; then weighed w (SiC)=97.0%, 75kg of silicon carbide particles with a particle size greater than 0.1mm and less than or equal to 5mm, mixed with 4kg of resin binder in a roller sand mixer, added the matrix mixed in the previous stage, stirred and mixed evenly, and formed With viscous sand-like material, the material is trapped for 24 hours; after the sand-like material is trapped, it is formed into a green body in a steel mold on a 630 T friction brick press; it is dried in three steps: natural drying for 12 hours, forced drying at 70°C for 12 hours, and 150 ℃ forced drying for 6 hours; finally put the dried green body into a sagger filled with graphite powder and embed carbon for treatment, and burn it in a resi...

Embodiment 2

[0019] Weigh separately w (La 2 o 3 ) ≥ 99%, 1 kg of lanthanum oxide fine powder with particle size less than or equal to 60 μm, w (Al 2 o 3 +MgO)=99.0%, particle size ≤0.1mm and fused magnesia-aluminum spinel fine powder with 95% spinel phase, 24kg, mixed for 6h; then weighed w (SiC)=97.0%, 75kg of silicon carbide particles with a particle size greater than 0.1mm and less than or equal to 5mm, mixed with 4kg of resin binder in a roller sand mixer, added the matrix mixed in the previous stage, stirred and mixed evenly, and formed With viscous sand-like material, the material is trapped for 24 hours; after the sand-like material is trapped, it is formed into a green body in a steel mold on a 630 T friction brick press; it is dried in three steps: natural drying for 12 hours, forced drying at 70°C for 12 hours, and 150 ℃ forced drying for 6 hours; finally put the dried green body into a sagger filled with graphite powder for carbon treatment, and burn it in a resistance fur...

Embodiment 3

[0021] Weigh separately w (Y 2 o 3 ) ≥ 99%, 5 kg of yttrium oxide fine powder with particle size less than or equal to 60 μm, w (Al 2 o 3 +CaO)=99.0%, particle size ≤0.1mm and calcium hexaaluminate phase of 95% calcium hexaaluminate powder 20kg, mixed for 6h; then weighed w (SiC)=97.0%, 75kg of silicon carbide particles with a particle size greater than 0.1mm and less than or equal to 5mm, mixed with 4kg of resin binder in a roller sand mixer, then added the fine powder mixed in the previous stage, and stirred to mix evenly. A viscous sand-like material is formed, and the material is trapped for 24 hours; after the sand-like material is trapped, it is formed into a green body in a steel mold on a 630 T friction brick press; it is dried in three steps: natural drying for 12 hours, forced drying at 70°C for 12 hours, Forced drying at 150°C for 6 hours; then put the dried green body into a sagger filled with graphite powder for carbon treatment, and burn it in a resistance f...

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Abstract

The invention belongs to the technical field of refractory materials, and provides a silicon carbide composite refractory product containing rare earth oxide. The silicon carbide composite refractoryproduct containing the rare earth oxide comprises aggregate and a matrix, wherein the aggregate is silicon carbide particles, the matrix is composed of fine rare earth oxide powder and one selected from a group consisting of fine magnesium aluminate spinel powder and fine calcium hexaluminate powder, the content of the fine rare earth oxide powder accounts for 1%-5% of the total mass of raw materials, and the content of the fine magnesium aluminate spinel powder or fine calcium hexaluminate powder accounts for 20%-45% of the total mass of the raw materials; and the content of the silicon carbide particles accounts for 50-75% of the total mass of the raw materials. The aggregate, the matrix and a resin binder are uniformly mixed and then pressed into a green body, and then the green body issubjected to high-temperature sintering treatment to obtain the silicon carbide composite refractory product which takes yttrium aluminum garnet or magnesium-based hexaaluminate as a rare earth binding phase and silicon carbide and magnesium aluminate spinel or calcium hexaaluminate as main crystalline phases. The refractory product has the characteristics of excellent alkali slag corrosion resistance and excellent slag permeability resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and mainly relates to a silicon carbide composite refractory product containing rare earth oxides. Background technique [0002] China's energy pattern of rich coal, poor oil, and little gas determines that the direction of China's energy development must focus on the deep processing of coal; at this stage, low-rank coal (including lignite, long-flame coal, weakly caking coal and non-caking coal) China's coal reserves and current coal production account for more than 50%. Therefore, based on the dual considerations of economy and environmental protection, it is necessary to promote the clean and efficient utilization of low-rank coal. At present, the coal-water slurry gasifier has become the mainstream equipment for coal gasification, but its Harsh working environment (high temperature (1300~1500°C), high pressure (2.0~8.7 MPa), strong reducing atmosphere (main components CO and H2))...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/44C04B35/443C04B35/565C04B35/622
CPCC04B35/44C04B35/443C04B35/565C04B35/622C04B35/66C04B2235/3222C04B2235/3225C04B2235/3227C04B2235/96
Inventor 李红霞孙红刚夏淼司瑶晨赵世贤杜一昊尚心莲亢一娜
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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