A kind of preparation method of space lattice ceramic/metal wear-resistant material

Abstract

The invention belongs to the technical field of preparation and application of wear-resistant materials, and in particular relates to a preparation method of space-grid ceramic / metal wear-resistant materials. In order to put Al 2 o 3 The ceramics are evenly added to the high-chromium cast iron matrix with excellent toughness, and the Al 2 o 3 Good metallurgical bonding is achieved between ceramics and cast iron substrates to meet the requirements of wear-resistant parts of coal mills. The invention provides a preparation method for space-grid ceramic / metal wear-resistant materials. This method selects alumina particles of appropriate size and 304 stainless steel wire mesh with appropriate spacing, then lays the wire mesh and alumina ceramic interlayer, and at the same time welds and reinforces the top cover plate of the mold at equal intervals, and casts from both ends of the mold at the same time. At the same time, the vacuum pump is used to evacuate the mold, so that the ceramic particles and the metal matrix can be evenly distributed and metallurgically combined, and the wear resistance of ceramics and the mechanical properties of metal can be organically combined, so that the entire structure has sufficient wear resistance during operation. and abrasion resistance.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of wear-resistant materials, and particularly relates to a preparation method of a space grid-shaped ceramic / metal wear-resistant material. Background technique [0002] The rapid development of modern society is inseparable from high-performance materials with excellent mechanical properties and resistance to harsh environments. Heavy industries with complex working conditions, such as cement, electric power, mining and coal mining industries, place higher requirements on the wear resistance of wear-resistant materials and their mechanical parts. In the actual service process, the coal mill is not only subjected to harsh working conditions such as high temperature oxidation, corrosion, and high impact, but also is worn by hard abrasives, resulting in rapid failure of parts due to wear. Severe wear causes a large amount of metal loss. At the same time, the rapid failure of par...

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Problems solved by technology

However, its welding performance is poor, and there are mainly the following types of problems during operation:

[0004] 1) The wear-resistant parts of the grinding disc and grinding roller are quickly worn by hot air, the service time is short, and the cost of replacement construction and surfacing welding is high;

[0005] 2) The output of coal grinding fluctuates greatly due to the wear of the wear-resistant parts of the grinding disc and the grinding roller. With the wear of the wear-resistant parts, the output per machine is greatly reduced and the average fineness of pulverized coal cannot meet the production and design requirements;

[0006] 3) With the wear of the wear-resistant parts of the grinding roller, the amount of slag returned to the coal vertical mill increases, which increases the wear of the scraper, and at the same time, the vibration of the whole mill and the roller bearing will increase, which affects the stable operation of the mill;

[0007] 4) After the worn grinding roller is repaired by surfacing welding, there are still safety hazards such as partial shedding, overall shedding, cracking of the grinding roller after repair welding, and deformation of the grinding roller.

Thanks Al 2 o 3 The physical and chemical properties of ceramic and iron matrix are very different, which makes it difficult to achieve uniform distribution of ceramic particles in the metal matrix, which will have an adverse effect on the wear resistance of composite materials

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