High-strength silicon carbide-oxide composite material and preparation method thereof

A composite material and oxide technology, applied in the field of refractory materials, can solve the problems of difficult chemical bonding, low mechanical strength, and mutual non-wetting, and achieve the effect of improving mechanical strength, high mechanical strength at room temperature and high temperature, and easy control.

Active Publication Date: 2021-03-12
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Analysis of the reasons for the low mechanical strength of silicon carbide-oxide composites is mainly due to the fact that silicon carbide in the raw material is a covalently bonded non-oxide, while calcium hexaaluminate and magnesium aluminum spinel are ionically bonded oxides. Mutual non-wetting between oxides and non-oxides makes it difficult to form an effective chemical bond during high-temperature firing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weighing and batching of raw materials: 60 kg of fused silicon carbide particles (SiC=97.0%) with a particle size range of 0.5 to 5 mm; alumina fine powder (Al 2 o 3 =98.5) 39 kg; Fe with particle size less than or equal to 50 μm 2 o 3 Powder 1kg.

[0026] Preparation process: (1) Pour the weighed fused silicon carbide particles into the sand mixer, add 2 kg of 5% polyvinyl alcohol aqueous solution, and stir to make the surface of the silicon carbide particles wetted by liquid; Add Fe to the pellets 2 o 3 (3) Add 3 kg of liquid phenolic resin to the granulation material, then add alumina fine powder, and stir evenly to form a semi-dry material; (4) Mix the semi- The dry material is placed in a steel mold and pressed into a refractory green body; (5) The green body is dried at 200°C; (5) The dried green body is heat-treated at a maximum temperature of 1400°C in an atmosphere of buried carbon to obtain silicon carbide - oxide composites.

[0027] Product performanc...

Embodiment 2

[0029] Raw material weighing and batching: 65 kg of fused silicon carbide particles (SiC=98.0%) with a particle size ranging from 0.5 to 5 mm; 33 kg of fused magnesia fine powder (MgO=99.0) with a particle size of 0.1 mm or less; 50 μm or less V 2 o 5 Powder 2 kg.

[0030] Preparation process: (1) Pour the weighed silicon carbide particles into the sand mixer, add 2.5 kg of water-soluble resin, and stir to make the surface of the silicon carbide particles infiltrated by liquid; (2) Add V to the silicon carbide particles 2 o 5 (3) Add 3 kg of liquid furfural resin to the granulation material, then add magnesium oxide fine powder, and stir evenly to form a semi-dry material; (4) Mix the semi-dry The dry material is placed in a wooden mold and pressed into a refractory green body; (5) The green body is dried at 80°C; (5) The dried green body is heat-treated at a maximum temperature of 1600°C in an atmosphere of carbon embedding to obtain silicon carbide - oxide composites.

...

Embodiment 3

[0033] Weighing and batching of raw materials: 70 kg of fused silicon carbide particles (SiC=98.5%) with a particle size range of 1 to 3 mm; sintered spinel fine powder (Al 2 o 3 =78.1%, MgO=21.4%) 27 kg; TiO with particle size less than or equal to 30μm 2 Powder 3 kg.

[0034] Preparation process: (1) Pour the weighed silicon carbide particles into the sand mixer, add 1.5 kg of 5% polyvinyl alcohol aqueous solution, stir and then add 2 kg of water-soluble resin, and continue to stir so that the surface of the silicon carbide particles is infiltrated by liquid ; (2) Adding TiO to silicon carbide particles 2 powder, stir evenly to form coated silicon carbide pellets; (3) add 3 kg of dextrin liquid to the pellets, then add spinel fine powder, stir evenly to form semi-dry pellets; (4) add The semi-dry material is placed in a steel mold and pressed into a refractory green body; (5) The green body is dried at 110°C; (5) The dried green body is placed in a circulating N 2 Heat t...

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Abstract

The invention belongs to the field of refractory materials, and mainly relates to a silicon carbide-oxide composite material and a preparation method thereof. The high-strength silicon carbide oxide composite material is composed of silicon carbide particles, oxide fine powder and a special oxide additive, wherein the oxide fine powder is one or a combination of aluminum oxide, magnesium oxide, magnesium aluminate spinel and calcium hexaluminate, and the particle size of the oxide fine powder is less than or equal to 0.1 mm; the special oxide additive is one or a combination of high-valence oxides of variable valence elements of Fe2O3, V2O5, Mn2O7, Mn2O5, MnO2, CeO2, TiO2 and P2O5; the silicon carbide particles account for 60%-70% of the total mass of the whole raw material solid, the oxide fine powder accounts for 27%-39% of the total mass of the whole raw material solid, and the special oxide additive accounts for 1%-5% of the total mass of the whole raw material solid. The mechanical strength of the silicon carbide-oxide composite material is improved on the premise that the main chemical composition and functions of the silicon carbide-oxide composite material are not reduced.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a silicon carbide-oxide composite material and a preparation method thereof. Background technique [0002] The harsh working conditions of high temperature (1300-1500°C), high pressure (2.0-8.7 MPa), and reducing atmosphere of coal-water slurry gasification have high requirements on the performance of refractory materials; the ash in the coal in the furnace and the additives in the coal slurry are formed SiO 2 , CaO, FeO x 、Al 2 o 3 , MgO, TiO 2 、K 2 O, Na 2 The slag mainly composed of O and other components flows along the inner wall of the refractory material furnace, which severely erodes and scours the refractory material at high temperature, so it requires high mechanical strength of the refractory material. [0003] High chrome brick (Cr 2 o 3 -Al 2 o 3 -ZrO 2 Brick) is currently the most successful lining refractory material used in coal-water slurry ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3826C04B2235/3217C04B2235/3206C04B2235/3222C04B2235/96C04B2235/9607Y02E20/18
Inventor 孙红刚李红霞司瑶晨杜一昊赵世贤夏淼尚心莲
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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