Preparation method of brown corundum-ferrosilicon nitride composite material for cement kiln mouth

A technology of ferrosilicon nitride and composite materials, which is applied in the field of advanced refractory materials, and can solve the problems of poor oxidation resistance, unsatisfactory corrosion resistance and low thermal shock resistance of silicon carbide bricks and silicon carbide composite bricks. Problems, achieve good thermal shock stability, excellent corrosion resistance and oxidation resistance, and good thermal shock stability

Inactive Publication Date: 2016-04-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, high-alumina bricks have high seismic stability, but the use temperature is low; magnesia-alumina spinel bricks and directly bonded magnesia-chrome bricks have high use temperature, but low thermal shock resistance; silicon carbide bricks and silicon carbide composite bricks The anti-oxidation performance is not good, and it is easy to oxidize when the kiln mouth is in contact with air
[0006] Corundum material is the most commonly used raw material in refractory. It has the characteristics of high hardness, high melting point and good chemical stability, but its thermal shock stability is poor and its corrosion resistance is not ideal. Silicon nitride can make up for the shortcomings of corundum. It has excellent wear resistance, chemical properties, good thermal shock stability, low high temperature creep and other characteristics

Method used

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Examples

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Comparison scheme
Effect test

example 1

[0016] According to the ratio of raw materials, the mass fraction is 50% brown corundum large particles, 15% brown corundum medium particles, 10% brown corundum fine powder, 5% activated alumina fine powder, 20% ferrosilicon nitride fine powder, and 3 -5% phenolic resin is used as a binder, the raw materials are mixed and then kneaded, and pressed to form under 20MPa. Put the pressed sample into the sintering furnace, pass nitrogen gas with a purity of 0.9999, raise the temperature to 1100°C for 2 hours, carry out nitriding at 1300°C for 8 hours, and then cool naturally to prepare the brown corundum-iron silicon nitride composite refractory material .

example 2

[0018] According to the ratio of raw materials, the mass fraction is 40% brown corundum large particles, 25% brown corundum medium particles, 10% brown corundum fine powder, 20% activated alumina fine powder, 5% ferrosilicon nitride fine powder, and additionally add 3 -5% phenolic resin is used as a binder, the raw materials are mixed and then kneaded, and pressed to form under 20MPa. Put the pressed sample into the sintering furnace, pass nitrogen gas with a purity of 0.9999, raise the temperature to 1100°C for 2h, carry out nitriding at 1500°C for 8h, and then cool naturally to prepare the brown corundum-iron silicon nitride composite refractory material

example 3

[0020] According to the ratio of raw materials, the mass fraction is 40% brown corundum large particles, 25% brown corundum medium particles, 10% brown corundum fine powder, 10% activated alumina fine powder, 15% ferrosilicon nitride fine powder, and 3 -5% phenolic resin is used as a binding agent, the raw materials are mixed and kneaded, and pressed to form under 30MPa. Put the pressed sample into the sintering furnace, pass nitrogen gas with a purity of 0.9999, raise the temperature to 1100°C for 2 hours, carry out nitriding at 1300°C for 8 hours, and then cool naturally to prepare the brown corundum-iron silicon nitride composite refractory material .

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Abstract

The invention relates to a brown corundum-ferrosilicon nitride composite material for a cement kiln mouth; brown corundum large particles and brown corundum medium particles are used as a basic skeleton of a refractory product, a brown corundum fine powder, an activated alumina micro powder and a ferrosilicon nitride powder are used as raw materials, a thermosetting phenol-formaldehyde resin is used as a binder, a sintering reaction is performed in a nitrogen atmosphere, and a brown corundum-ferrosilicon nitride composite refractory brick is prepared through carrying out a reaction at different temperature stages. The raw materials are easy to obtain, no chromium and no carbon are contained, the raw materials are easy to obtain and cheap, the process is simple and feasible, the pressure has no need to be applied, the sintering temperature is low, the energy consumption is lower, and pollution can be prevented from being produced in the production process and the use process to a larger extent. The material has the advantages of high strength, good thermal shock stability and excellent erosion resistance, and is an excellent refractory product for the cement kiln mouth.

Description

technical field [0001] The invention belongs to the field of high-grade refractory materials, and relates to a preparation method of cement kiln materials, in particular to a preparation method of brown corundum-ferrosilicon nitride materials for cement kiln mouths. Background technique [0002] The kiln mouth of a cement kiln is a very special and important position in the cement kiln. The use conditions are harsh and complex, and the damage is rapid. The lining must be stopped and cooled before the lining can be replaced. Therefore, the service life of this position directly affects the operation rate and output of the cement kiln. [0003] Since the kiln mouth of the cement kiln is also the feed port, when the high-temperature clinker enters, it will cause great erosion and wear to the rotating cement kiln mouth; due to the interval contact with the high-temperature clinker and the primary and secondary air The temperature difference between the kiln mouth and the cold ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/103C04B35/622C04B35/634
CPCC04B35/103C04B35/622C04B35/63476C04B2235/3873C04B2235/3891C04B2235/658C04B2235/77
Inventor 李勇秦海霞
Owner UNIV OF SCI & TECH BEIJING
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