Preparation method of Al4SiC4-Al2O3-SiC composite material

A technology of al2o3-sic and composite materials, which is 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: 2018-06-29
江苏诺明高温材料股份有限公司
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  • 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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  • Preparation method of Al4SiC4-Al2O3-SiC composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A kind of Al 4 SiC 4 Combined with Al2O 3 -SiC composite material preparation method,

[0018] In terms of weight percentage, the raw material composition is: 65% of 83 high alumina bauxite, 20% of SiC, 12% of activated alumina, 3% of metal aluminum powder, and 3% of phenolic resin as the binder.

[0019] During production, various raw materials are first weighed according to the ratio, mixed evenly, and then mixed to obtain mud, and then pressed into a shape by a friction press, dried at 120-250℃ for 10-25h, and then at 1300℃-1700℃ Sintering 5-12h in buried carbon atmosphere.

[0020] The powders are silicon carbide, activated alumina and metal aluminum powder with a particle size of less than 0.088 mm, and the aggregates are 83 high alumina bauxite and silicon carbide with a particle size of 3-1 mm and 1-0 mm.

[0021] The performance indicators of the obtained product are: apparent porosity 6.5%, bulk density 3.10 g / cm3, normal temperature compressive strength 185...

Embodiment 2

[0029] Example 2: The production process is the same as that of Example 1, except that:

[0030] A kind of Al 4 SiC 4 Combine Al 2 O 3 -The preparation method of SiC composite material, in terms of weight percentage, the raw material composition is: 70% 83 high alumina bauxite, 15% SiC, 10% activated alumina, 5% metal aluminum powder, plus 3% phenolic aldehyde The resin is the binder. The powders are silicon carbide, activated alumina and metal aluminum powder with a particle size of less than 0.088 mm, and the aggregates are 83 high alumina bauxite and silicon carbide with a particle size of 3-1 mm and 1-0 mm.

[0031] The performance indicators of the obtained product are: apparent porosity 5.8%, bulk density 3.13 g / cm3, normal temperature compressive strength 196MPa, thermal shock stability (1100℃, water cooling) 28 times, high temperature flexural strength 50 MPa, wear resistance 2.1 cc, its corrosion resistance and penetration are better.

Embodiment 3

[0032] Example 3: The production process is the same as that of Example 1, except that:

[0033] A kind of Al 4 SiC 4 Combine Al 2 O 3 -The preparation method of SiC composite material, in terms of weight percentage, the raw material composition is: 61% 83 high alumina bauxite, 15% SiC, 15% activated alumina, 7% metal aluminum powder, 2% carbon black, , 3% phenolic resin is added as a binder. The powders are silicon carbide, activated alumina and metal aluminum powder with a particle size of less than 0.088 mm, and the aggregates are 83 high bauxite and silicon carbide with a particle size of 3-1 mm and 1-0 mm.

[0034] The performance indicators of the obtained product are: apparent porosity 5.3%, bulk density 3.16 g / cm3, normal temperature compressive strength 208MPa, thermal shock stability (1100℃, water cooling) 32 times, high temperature flexural strength 59 MPa, wear resistance 1.8 cc, its corrosion resistance and penetration are better.

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Abstract

The invention relates to a preparation method of an Al4SiC4-Al2O3-SiC composite material, and belongs to the field of refractory materials. The composite material is prepared from the following raw materials in percentage by weight: 45 to 86 percent of high bauxite, 10 to 25 percent of silicon carbide, 5 to 15 percent of active alumina, 1 to 15 percent of metal aluminum, 0 to 5 percent of carbon black or graphite and phenolic resin binder in an amount of 2 to 6 percent based on the total amount of the abovementioned materials. The preparation method comprises the following steps: during production, weighing the raw materials according to a proportion; mixing uniformly to obtain mud; performing press molding; drying at the temperature of 120 to 250 DEG C for 10 to 25 hours; then sintering in a carbon-buried atmosphere of 1,300 to 1,700 DEG C for 5 to 12 hours. Al4SiC4 sintered in situ in a high-temperature sintering process of the product is a binder phase. The composite material has the advantages of high melting point, high strength, high wear resistance, high chemical stability, low thermal expansion coefficient, excellent oxidation resistance and excellent hydration resistance,and is a high-temperature structural material as well as a high-performance refractory material.

Description

Technical field [0001] The present invention relates to an Al 4 SiC 4 Combine Al 2 O 3 The preparation method of -SiC composite material belongs to the field of refractory materials. Background technique [0002] As the production of cement rotary kilns becomes larger and larger, the speed of the kiln increases and the diameter of the kiln increases, the requirements for refractory materials are getting higher and higher. In particular, the refractory lining at the mouth of the rotary kiln is the weak link of the kiln lining. It needs to withstand the impact of rapid cold and hot air flow, high temperature cement clinker wear and high temperature harmful gas alkali corrosion, etc., and the use conditions are very harsh. It is required that refractories must have good thermal shock resistance, wear resistance and alkali resistance. [0003] The cooling chamber of the dry quenching coke oven mainly completes the cooling of the coke in the dry quenching furnace. The cooling airflow a...

Claims

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Application Information

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Patent Type & Authority Applications(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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