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Silicon carbide-calcium hexaluminate composite refractory material

A technology of calcium hexaaluminate and refractory materials, applied in the field of refractory materials, can solve the problems of low operating temperature and poor slag resistance, and achieve the effects of improving slag resistance, good thermal shock resistance and low price

Active Publication Date: 2018-04-10
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional clay-bonded silicon carbide has low service temperature and poor slag resistance, which cannot meet the requirements

Method used

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  • Silicon carbide-calcium hexaluminate composite refractory material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The chemical composition of the particle size greater than 10 μm and less than or equal to 90 μm was weighed as w (Al 2 o 3 +CaO)≥98.0%, Al 2 o 3 ≈90%, density about 3.0 g / cm 3 The chemical composition of 35 kg of sintered calcium hexaaluminate fine powder with a particle size greater than 43 μm and less than or equal to 74 μm is w (Al 2 o 3 ) ≥ 99.0% fused white corundum fine powder 3 kg, analytically pure calcium oxide fine powder 1 kg, metal aluminum powder with a particle size greater than 20 μm and less than or equal to 50 μm 1 kg, fully premixed by a ball mill to prepare matrix fine powder; w (SiC) ≥ 98.0% fused silicon carbide particles, of which 15 kg of particles with a particle size greater than 0.1 mm and less than or equal to 1 mm, 30 kg of particles with a particle size greater than 1 mm and less than or equal to 3 mm, 15 kg of particles with a particle size greater than 3 mm and less than or equal to 5 mm Add it to the wheel-type sand mixer and mix ...

Embodiment 2

[0028] The chemical composition of the particle size greater than 10 μm and less than or equal to 90 μm was weighed as w (Al 2 o 3 +CaO)≥98.5%, Al 2 o 3 ≈91%, density about 3.05 g / cm 3 The chemical composition of 27 kg of sintered calcium hexaaluminate fine powder with a particle size greater than 43 μm and less than or equal to 74 μm is w (Al 2 o 3 ) ≥ 99.0% tabular corundum fine powder 5 kg, calcium carbonate fine powder 1.5 kg, metal aluminum powder 1.5 kg with a particle size greater than 20 μm and less than or equal to 50 μm, fully pre-mixed by a ball mill to prepare matrix fine powder; w (SiC) ≥ 98.0% fused silicon carbide particles, of which 15 kg of particles with a particle size greater than 0.1 mm and less than or equal to 1 mm, 30 kg of particles with a particle size greater than 1 mm and less than or equal to 3 mm, 25 kg of particles with a particle size greater than 3 mm and less than or equal to 4 mm Add it to the wheel-type sand mixer and mix it evenly; a...

Embodiment 3

[0030] The chemical composition of the particle size greater than 10 μm and less than or equal to 74 μm was weighed as w (Al 2 o 3 +CaO)≥99.0%, Al 2 o 3 ≈92%, density about 2.8 g / cm 3 15 kg of sintered calcium hexaaluminate fine powder, the chemical composition of which is greater than 43 μm and less than or equal to 74 μm is w (Al 2 o 3 )≥99.0% fused white corundum fine powder 7.5 kg, particle size D 50 =5μm, w (Al 2 o 3 )≥99.0% of α-Al 2 o 3 5 kg of fine powder, 0.5 kg of fine calcium oxide powder, 2 kg of spherical graphite powder with a particle size greater than 30 μm and less than or equal to 50 μm, fully premixed by a ball mill, and prepared into matrix fine powder; w (SiC) ≥ 98.5% fused silicon carbide particles, of which 15 kg of particles with a particle size greater than 0.1 mm and less than or equal to 0.5 mm, 20 kg of particles with a particle size greater than 0.5 mm and less than or equal to 1.43 mm, 35 kg of particles with a particle size greater t...

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Abstract

The invention belongs to the refractory material technical field, and discloses a silicon carbide-calcium hexaluminate composite refractory material. The silicon carbide-calcium hexaluminate compositerefractory material disclosed by the invention adopts the aggregate with the SiC mass fraction of more than or equal to 98.0%, the aggregate is silicon carbide particles with the particle size of 0.1-5 mm, and pre-synthesized calcium aluminate is contained in a matrix; calcium oxide and alumina which can undergo an in-situ reaction to generate calcium hexaluminate are also added in the matrix; anantioxidant is further added to the matrix; the aggregate, the matrix and a binder are mixed and formed, the mixture is dried and then is sintered at high temperature under carbon burying or nitrogenatmosphere protection to prepare the silicon carbide-calcium hexaluminate composite refractory material with SiC as a main crystal phase and calcium hexaluminate as a sub-crystal phase. The silicon carbide-calcium hexaluminate composite refractory material has the characteristics of high strength, good thermal shock resistance, excellent resistance to alkaline slag corrosion and excellent penetration resistance to slag, and is an environmentally friendly refractory material with excellent resistance to alkaline slag corrosion at high temperature and under reductive atmosphere.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and mainly relates to a silicon carbide-calcium hexaaluminate composite refractory material. Background technique [0002] In the use of refractory materials, some emphasize thermal insulation at high temperatures, some require high-temperature structural strength, and there is a large category of reactors that are mainly used for high-temperature melts. This type of material requires high temperature resistance and excellent slag resistance. Performance is the main goal pursued. For example, the coal-water slurry gasification device in the field of coal gasification, which makes coal and water into a slurry and then pumps it into a gasifier to prepare CO and H under high temperature and high pressure. 2 Advanced equipment for coal gasification where chemical gases are used to synthesize chemical products. The inner cavity of the device is made of refractory materials. 2 Atmospheri...

Claims

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Application Information

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IPC IPC(8): C04B35/567C04B35/622C04B35/634
CPCC04B35/565C04B35/622C04B35/634C04B35/63472C04B35/63476C04B35/66C04B2235/3208C04B2235/3217C04B2235/3222C04B2235/3821C04B2235/386C04B2235/3865C04B2235/402C04B2235/425C04B2235/48C04B2235/5436C04B2235/5445C04B2235/77C04B2235/9669C04B2235/9684C04B2235/9692
Inventor 李红霞孙红刚赵世贤蔡斌利王刚杜一昊王岚
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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