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LHY-1

Ceramic wear-resistant material particles should have a high bonding strength. Substrate and hard aggregate firmly stuck together, without spalling, in order to give full play to the high wear resistance of the hard phase. In practice, most of the wear is due to the combined phase is damaged by abrasive particles, hard aggregate off, can not give full play to the role, so improve the hardness and strength of the combined phase is crucial.

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Product Description

Types of high strength ceramic wear resistant materials:

According to the working environment and requirements of wear-resistant materials, high-strength ceramic wear-resistant materials are divided into the following categories:

1, according to the main components of the product is divided into two categories: alumina type and silicon carbide type

2, according to the use of temperature is divided into three kinds:

Low temperature type: less than or equal to 300 ℃

Medium temperature type: 300℃-600℃ 600℃-1000℃.

High-temperature type: 1000℃-1600℃

3、According to the combination is divided into two categories: inorganic combination and organic combination

4、Divided into three categories according to the construction method: casting type, coating type and spraying type. The products have the advantages of high strength, good wear-resistant performance, excellent bonding performance, corrosion resistance, good thermal shock stability, small line variation, long service life, etc. They can be widely used in ironmaking, power generation, building materials, petrochemicals, non-ferrous metals and other industries.

Ceramic wear-resistant material consists of the following components:

A. hard grains B. micronized filler C. binding agent D. wear-resistant agent

Among them, the hard aggregate constitutes the skeleton part of ceramic wear-resistant material, the micro-powder fills the gaps, and the overall dense structure is formed through the binding agent to form a wear-resistant lining body with high strength, which achieves the purpose of wear-resistant and corrosion-resistant.

Wear is a complex process in which solids, liquids, gases and mixtures of abrasive particles, etc. and the surface of an object produce relative motion and cause the object to lose continuously.

According to the friction surface of the wear process and damage mechanism characteristics, the wear will be divided into abrasive wear, adhesive wear, corrosive wear. Frequently encountered wear is usually a combination of several types of wear, high temperature wear is actually a combination of adhesive wear and abrasive wear.

According to the wear mechanism of the material, to improve the wear resistance of the liner, should start from the following aspects:

First, the hardness of the liner body material

Generally speaking, only the hardness of the liner wear-resistant material is higher than the hardness of the abrasive material, in order to improve the wear resistance of the liner material. However, it is not the higher the hardness the better, only the material hardness and fracture toughness is in the best fit, the wear resistance performance is optimal. At high temperatures, not only requires good high temperature red hardness, and the abrasive media reactivity should be small.

Second, the liner and matrix material matching matrix without strain

Lining body for load work, the basic should have enough hardness and yield strength, in order to support the lining body does not deform, does not produce large stress caused by separation. At the same time, the liner and the matrix material in the coefficient of rigidity and expansion, the modulus of elasticity should be matched, so as not to cause non-work damage, and the liner and the matrix material should be good, only the formation of the maximum chemical affinity and does not produce brittle interfacial phases, in order to give full play to the role of wear-resistant liner.

Third, the liner material particles should be high bonding strength

Ceramic wear-resistant material particles should have a high bonding strength. Substrate and hard aggregate firmly stuck together, without spalling, in order to give full play to the high wear resistance of the hard phase. In practice, most of the wear is due to the combined phase is damaged by abrasive particles, hard aggregate off, can not give full play to the role, so improve the hardness and strength of the combined phase is crucial.

Fourth, the liner material corrosion-resistant wear

Wear-resistant liner in corrosive media wear resistance also depends on the wear-resistant materials in the chemical media corrosion resistance, can not react with corrosive media, otherwise the wear resistance of the liner material is greatly reduced, the liner material and corrosive substances in the chemical composition of changes in the structure of the liner is destroyed, thus losing wear resistance.

Fifth, construction methods and maintenance

Wear-resistant lining body has a specific construction method and maintenance requirements, the Engineering Department in strict accordance with the initial development of the construction program implementation, if you change the construction method or lack of necessary maintenance, the strength and bonding properties will not be the best, it is difficult to meet the design requirements.

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