Method for preparing composite abrasion-proof lining board

Abstract

The invention discloses a method for preparing a composite wear resistant lining plate. The method comprises the following steps: adopting alloy powder core bar materials of which the volume percentage is between 20 and 60 percent of the total volume of the lining plate, filling alloy powder in the core part of the alloy powder core bar materials, preset the alloy powder core bar materials in a lining plate casting mould, selecting base metal to be melted and poured in the lining plate casting mould, and cooling and demoulding the lining plate to obtain the composite wear resistant lining plate consisting of the alloy powder core bar materials and the base metal. The cylindrical hard phase of the composite wear resistant lining plate prepared by the method is generated by compounding in situ in a matrix, thus the composite wear resistant lining plate has the characteristics that segregation is not generated, the organization structure is even, the hard phase is difficult to fall off, the lining plate not only has the intensity and the toughness of the base metal but also has the high hardness and the high wear resistance of the hard phase, the service life is improved by an order of magnitude compared with the prior lining plate, the lining plate can bearing high impact force and strong wear at the same time, the technological parameter controllability of the preparation process is strong, and the price is low. The composite wear resistant lining plate can satisfy the applications under complex working conditions such as various wears, high impact and the like.

Description

technical field [0001] The invention relates to mechanical equipment in the fields of general crushing, grinding, conveying, flotation and crushing, especially a method for preparing a composite wear-resistant lining. The composite wear-resistant lining prepared by the method is especially suitable for large-diameter, high-impact, Manufacture of parts for machinery and equipment in the field of grinding and crushing. Background technique [0002] Lining plates on machinery such as crushing, milling, flotation, and conveying, which are widely used in coal, metallurgy, mining, electric power, building materials, refractory materials, and energy industries, are the main wear parts. At present, the lining plate materials used in various industries mainly include several single metal materials such as high manganese steel, multi-element low alloy steel, and chromium-based white cast iron. There is no hard carbide in high manganese steel, so the hardness is low. Only under high ...

AI Technical Summary

Problems solved by technology

In the ball mill, the balls impact the liner indirectly through the abrasive accumulation layer, the impact strength is small, and the work hardening effect is not significant, so the wear resistance cannot reach the ideal value; there is no hard carbide in the multi-element low alloy steel, Therefore, the hardness is low

The macroscopic hardness is around HRC40. Due to the low hardness, it cannot resist the pressing and scratching of abrasives. During use, a large number of cutting and plastic changes occur on the surface and low-cycle fatigue, so the wear resistance is not good; although chrome cast iron is wear-resistant, Good heat resistance and corrosion resistance, but poor plasticity and toughness, easy to break

Especially in the fields of large diameter, high impact, grinding and crushing, the safety is not satisfactory

In recent years, according to the specific working conditions and resource conditions of lining wear, domestic and foreign researches have been carried out mainly on chemical composition realloying, heat treatment process, smelting and pouring process, etc., and a variety of wear-resistant materials have been developed, mainly modified high manganese Steel, medium manganese steel, ultra-high manganese steel series, high, medium and low carbon wear-resistant alloy steel series, manganese series, boron series anti-wear white cast iron and martensitic, bainite anti-wear ductile iron and other lining materials , but because the mechanical properties of a single material in terms of strength, hardness, plasticity and toughness cannot take into account the special requirements of various on-site working conditions, the service life is still very short or it is difficult to meet the needs of various working conditions

[0003] In terms of composite material technology: currently commonly used cast-infiltration composite, the composite layer is too thin to be composited as a whole, and the surface remelting layer is prone to cracking and peeling; two-liquid composite, the process parameters cannot be accurately controlled; surfacing composite, composite layer prone to cracks etc.

Chinese patent CN1974068A discloses an embedded casting hard alloy wear-resistant liner and its manufacturing method. The manufacturing cost of this liner is high, and the hard alloy prefabrication is difficult. After the embedded casting, the hard alloy and the steel matrix are mechanically combined. State, low bonding strength, easy to fall off the hard phase, short service life

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