Preparation method of silicon carbide-oxide composite refractory product

A technology for refractory products and oxides, applied in the field of refractory materials, can solve the problems of unfavorable high temperature mechanical strength and slag erosion resistance, sacrificing slag resistance, and high production cost, and achieves good slag erosion resistance at high temperature and significantly improved performance. , The effect of equipment investment is small

Active Publication Date: 2020-02-21
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are a lot of SiO in it 2 The main glass phase is extremely unfavorable to the high temperature mechanical strength and slag erosion resistance of the material
For silicon carbide-calcium hexaaluminate or silicon carbide-magnesium aluminum spinel composite materials, a certain glass combination can also be formed in a lower oxidizing atmosphere, resulting in an increase in the mechanical strength at room temperature, but this will greatly sacrifice its slag resistance. ; And if it is fired in a reducing atmosphere at a high temperature above 1800 ° C, the energy consumption will be large, the requirements for equipment will be high, and the production cost will be extremely high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh w (SiC)=97.0%, 65kg of silicon carbide particles with a particle size of more than 0.1mm and less than or equal to 5mm, mixed with 4kg of resin binder in a wheel sand mixer, and added with a particle size of ≤0.1mm, w (Al 2 O 3 +MgO)=99.0%, spinel phase=95% fused magnesia-aluminum spinel fine powder 35kg, stir and mix evenly to form a sand-like material; the sand-like material is trapped in a steel mold at 630 T The green body with the shape of 230mm×114mm×65mm cuboid is formed on the friction brick press; the green body is naturally dried for 12 hours, forced to dry at 70°C for 12 hours, and forced to dry at 150°C for 6 hours; the dried green body is placed in a kiln with an oxidizing atmosphere. Heat treatment at the highest temperature of 1350 °C for 5 hours, and control the oxygen partial pressure in the furnace to be 10000~30000Pa through the air door, that is, the first step of firing the sample; Step-fired samples were taken out, placed in corundum sagga...

Embodiment 2

[0029] Weigh w (SiC)=98.0%, 8kg of silicon carbide particles with a particle size of greater than 0.5mm and less than or equal to 3mm, mixed with 0.3kg of the binder PVA aqueous solution in a roller sand mixer, and added with a particle size of ≤0.05mm, w (Al 2 O 3 +MgO)=99.3%, spinel phase=98% sintered magnesia-alumina spinel fine powder 2kg, stir and mix evenly to form sand-like material; after the sand-like material is trapped, it is placed in a steel mold in a 100 T hydraulic press The upper body is formed into a green body with a cube shape of 65mm×65mm×65mm; the green body is naturally dried for 48 hours, forced to dry at 50°C for 24 hours, and forced to dry at 110°C for 12 hours; the dried green body is placed in the furnace chamber of an electric furnace for atmospheric sintering, and the Enter the mixed gas composed of industrial oxygen and industrial nitrogen, control the oxygen partial pressure in the furnace to be 30000~50000Pa by adjusting the oxygen and nitroge...

Embodiment 3

[0031] Weigh w (SiC)=97.1%, 50kg of silicon carbide particles with a particle size greater than 0.1mm and less than or equal to 2.5mm, mixed with 45kg of the binder PVA aqueous solution in a wheel sand mixer, and added with a particle size of ≤0.1mm, w (Al 2 O 3 +MgO)=99.0%, spinel phase=95% sintered magnesia-alumina spinel fine powder 50kg, stir and mix evenly to form sand-like material; after the sand-like material is trapped, it is placed in a 400 T hydraulic press in a steel mold The upper body is formed into a green body with a rectangular parallelepiped shape of 230mm×114mm×65mm; the green body is naturally dried for 24 hours, forced to dry at 60°C for 24 hours, and forced to dry at 120°C for 10 hours; the dried green body is placed in a gas kiln, and natural gas and air are introduced into it. The formed mixed gas is fired, and the partial pressure of oxygen in the furnace is controlled to be about 20000Pa by adjusting the ratio of air and gas, and heat treatment is c...

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Abstract

The invention belongs to the field of refractory materials, and mainly relates to a preparation method of a silicon carbide-oxide composite refractory product. The firing process in the preparation method is a two-step firing method and comprises the steps: uniformly mixing silicon carbide particles and oxide fine powder with a liquid binding agent, pressing the mixture into a green body with a certain size and shape; drying the green body, and sintering the dried green body in an oxidizing atmosphere; and firing in a reducing atmosphere, wherein in the first step, firing is carried out in theoxidizing atmosphere, the firing temperature is 1300-1400 DEG C, the oxygen partial pressure in the firing atmosphere is 10000-50000 Pa, in the second step, firing is carried out in a reducing atmosphere, the firing temperature is 1600-1650 DEG C, and the oxygen partial pressure in the firing atmosphere is smaller than or equal to 1000 Pa. The method is high in operability, small in device investment and remarkable in effect of improving the performance of the composite refractory product.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a preparation method of a silicon carbide-oxide composite refractory product. Background technique [0002] High temperature (1300~1500℃), high pressure (2.0~8.7 MPa), reducing atmosphere (main components CO and H 2 ) is the main working condition of the coal-water slurry gasifier. At the same time, the ash in the coal and the SiO formed by the additives in the coal slurry 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 seriously erodes and scours the refractory material at high temperature; 2 O 3 -Al 2 O 3 -ZrO 2 Material, Cr 2 O 3 >75wt%) is a refractory material for the furnace lining to the refractory surface, which has good high-temperature mechanical properties and excellent slag resistance; however, chromium resources are limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/44C04B35/443C04B35/565C04B35/622C04B35/64
CPCC04B35/44C04B35/443C04B35/565C04B35/622C04B35/64C04B35/66C04B2235/658C04B2235/6583C04B2235/661C04B2235/9669
Inventor 孙红刚李红霞杜一昊赵世贤司瑶晨尚心莲亢一娜夏淼
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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