a kind of al 4 sic 4 combined al 2 o 3 - Preparation method of sic composite material

A composite material, al2o3-sic technology, applied in the field of refractory materials, can solve the problems of low service life of furnace lining materials, poor resistance to slag erosion and permeability, poor erosion resistance, etc., and achieve excellent thermal shock resistance and corrosion resistance And the effect of good anti-permeation, excellent anti-erosion and anti-permeation

Active Publication Date: 2021-05-25
江苏诺明高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The refractory materials used to connect and regulate molten iron transportation between ironmaking and steelmaking, storage buffer and pretreatment equipment such as mixed iron cars (torpedo tanks), mixed iron furnaces, and molten iron tanks generally have poor erosion resistance, Poor resistance to slag erosion and permeability, and C in the lining material is easily oxidized, resulting in problems such as low service life of the lining and easy slagging

Method used

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  • a kind of al <sub>4</sub> sic <sub>4</sub> combined al <sub>2</sub> o <sub>3</sub> - Preparation method of sic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017]Example 1: One Al4SiC4Combined with Al2O3-Sic composite preparation method,

[0018]According to the percentage of weight, the raw material group became: 65% of 83 high aluminum aluminum, 20% SiC, 12% active alumina, 3% metal aluminum powder, and 3% phenolic resin were combined.

[0019]When producing, the various raw materials are weighed first, mix well, mixed to obtain a mud, and then press molded, first drying 10-25 h at 120-250 ° C, then at 1300 ° C -1700 ° C Sintering under the charcoal atmosphere of 5-12h.

[0020]The powder is silicon carbide, activated alumina, and metal aluminum powder having a particle size of less than 0.088 mm, and the aggregate particle size of 3-1 mm, 1-0 mm 83 high aluminum carbide.

[0021]The performance indicators of the resulting product are: 6.5% aerobic, volume density of 3.10 g / cm3, normal temperature pressure strength 185MPa, thermal shock stability (1100 ° C, water cooling) 25 times, high temperature anti-fold intensity 45 MPa, wear resistance 2...

Embodiment 2

[0029]Example 2: The production process is the same, and the difference is:

[0030]Aloft4SiC4Combined Al2O3-Sic composite preparation method, according to weight percent, the raw material group has been: 70% of 83 high aluminum aluminous, 15% SiC, 10% activated alumina, 5% metal aluminum powder, plus 3% phenolic The resin is a binding agent. The powder is silicon carbide, active alumina, and metal aluminum powder having a particle size of less than 0.088 mm, and the aggregate particle size of 3-1 mm, 1-0 mm 83 high alumina and silicon carbide.

[0031]The performance indicators of the resulting product are: 5.8% of the aerobic density of 3.13 g / cm3, normal temperature pressure strength 196MPa, heat shock stability (1100 ° C, water-cooled), high temperature resistance 50 MPa, wear resistance 2.1 CC, its anti-erosion and penetration are better.

Embodiment 3

[0032]Example 3: The production process is the same, and the difference is:

[0033]Aloft4SiC4Combined Al2O3-Sic composite preparation method, according to weight percent, the raw material group has become: 61% of 83 high aluminum aluminum, 15% SiC, 15% active alumina, 7% metal aluminum powder, carbon black 2%, , 3% of the phenolic resin was applied as a binding agent. The powder is silicon carbide, activated alumina and metal aluminum powder having a particle size of less than 0.088 mm, and the aggregate particle size of 3-1 mm, 1-0mm 83 high aluminum carbide.

[0034]The performance index of the resulting product is: 5.3% of the aerobic fifth rate, volume density 3.16 g / cm3, normal temperature pressure resistance strength 208MPa, thermal shock stability (1100 ° C, water cold) 32 times, high temperature resistance 59 MPa, wear resistance 1.8 CC, its anti-erosion and penetration are better.

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Abstract

The present invention relates to an Al 4 SiC 4 Combined with Al 2 o 3 The invention discloses a method for preparing a SiC composite material, which belongs to the field of refractory materials. The raw material composition of this composite material by weight percentage is: 45%-86% high alumina bauxite, 10-25% silicon carbide, 5-15% activated alumina, 1-15% metal aluminum, 0-25% 5% carbon black or graphite, plus a phenolic resin binder of 2‑6% of the total amount of the above materials. During production, various raw materials are weighed according to the proportion, mixed evenly, and mud is obtained through mixing, and then pressed into shape, firstly dried at 120-250°C for 10-25 hours, and then sintered at 1300-1700°C under a charcoal-buried atmosphere 5‑12 h. Al is synthesized in situ during the high temperature firing process of the product of the present invention 4 SiC 4 As a binding phase, it has high melting point, high strength, high wear resistance, high chemical stability, low thermal expansion coefficient, and excellent oxidation resistance and hydration resistance. It is a high-temperature structural material and high-performance refractory material.

Description

Technical field[0001]The present invention relates to an Al4SiC4Combined Al2O3-SIC composite preparation method belongs to the field of refractory materials.Background technique[0002]With the production of cement rotary kiln, the speed of the kiln is accelerated, the kiln radius is increased, and the requirements for refractory materials are getting higher and higher. In particular, the rotary kiln refractory lining is the weak link of the kiln lining, which requires an emergency, acute hot air flow impact, high temperature cement cluster wear and high temperature harmful gas alkali corrosion, etc., the use conditions are very demanding. Refractive material must have good thermal shock resistance, wear resistance and alkali resistance.[0003]The dry extinguishing coke oven cooling chamber mainly completes the coke cooling of the dry overtime. The bottom cooling airflow along the upward coke layer on the top and the upper coke layer conversion heat, coke along the dry out of the dry o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/103C04B35/622C04B35/634C04B35/66C04B35/65
CPCC04B35/103C04B35/622C04B35/63476C04B35/65C04B2235/3817C04B2235/3826C04B2235/402C04B2235/424C04B2235/5427C04B2235/5436C04B2235/77C04B2235/96C04B2235/9607
Inventor 钱志明张军杰钱晶黄京衡
Owner 江苏诺明高温材料股份有限公司
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