Preparation method of reinforced composite wear-resistant lining board of precast framework

Abstract

The invention discloses a preparation method of a reinforced composite wear-resistant lining board of a precast framework. The prepared reinforced composite wear-resistant lining board is formed by compounding a framework reinforced body containing hard phases and base body metal. The preparation method comprises the following steps: adopting a framework precast body made of tube wires filled with hard materials, performing the vacuum high-temperature sintering, forming the framework reinforced body containing hard phases, and leading the framework reinforced body to perform the metal castingcomposite molding with the base body metal, so as to form the lining board formed by compounding the framework reinforced body containing hard phases and the base body metal. The framework reinforcedbody is performed by the vacuum high-temperature sintering to form a complete metallurgical texture structure, which has order arrangement, uniform distribution, stable performance and strong integrity, can always keep complete framework structure after compounding with the base body metal, thereby developing the high wear-resistance of the hard phases in the framework reinforced body, and keeping better flexibility of the base body metal. The reinforced composite wear-resistant lining board can be compounded locally or gradiently, or integrally, and can be widely applied to wear-resistant fields of mine, electricity, metallurgy, coal, building materials, and the like.

Description

technical field [0001] The invention relates to the preparation of a wear-resistant liner widely used in the fields of crushing, grinding, conveying, etc., and in particular to a preparation method of a composite wear-resistant liner with a prefabricated skeleton reinforcement. Background technique [0002] In metallurgy, mining, electric power, building materials and other industrial industries, a large number of lining plates are used for crushing, grinding, and conveying of materials. The lining plates are subjected to different degrees of erosion and wear, and are frequently replaced and costly. wearing 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. Only under high load and high impact stress, the high manganese steel can realize the solid phase transformation from austenite to martensite and work harden...

AI Technical Summary

Problems solved by technology

The two-liquid pouring process is relatively complicated, and a high-temperature protective agent must be used during the pouring process. Pores and slag inclusions are likely to occur at the joint site, which affects the overall performance and the composite quality is unstable. Because the cast-infiltration particle composite is formed by a binder, it is easy to produce Defects such as pores and slag inclusions, and the distribution uniformity of hard particles in the matrix is ​​difficult to ensure, and the effect is not ideal; cracks are easy to occur in surfacing welding, and the wear-resistant layer is easy to peel off and crack, and the scope of application is also limited

Other manufacturing technologies such as insert casting, due to problems such as low interface bonding strength and easy falling off of the hard phase, will lead to early failure

There are also people who use wire mesh as a prefabricated body, and other non-metallic materials are filled with high pressure to prepare liners. Due to the need for high-pressure equipment and special molds, the preparation process requires high requirements, and it is difficult to effectively combine heterogeneous materials. The overall performance is poor. Not ideal for actual use

The published patent application "A Preparation Method for Composite Wear-Resistant Lining Board", application number: 200810232316.8, uses alloy powder core rod as prefabricated body, melts the matrix metal and then casts and composites the lining board. This method mainly utilizes high temperature The heat of the molten metal melts and dissolves the alloy powder core rod, making it react in situ to form a rod-shaped hard phase. However, in actual preparation, due to the effect of temperature difference, the reaction of alloy elements is difficult to control, and the alloy elements at high temperatures are completely Dissolution and diffusion will completely dissolve into the matrix metal, resulting in the deterioration of the matrix metal, which cannot guarantee the original performance, and cannot achieve the effect of material composite; while the parts with low temperature, the alloy elements are not completely reacted, and only play the role of sintering. A complete metallurgical structure cannot be formed, and the effect of reinforcement cannot be achieved; at the same time, the alloy powder core rod is easy to soften and deform at high temperature, destroying the orderly arrangement of the prefabricated body, and it is difficult to ensure the uniformity of the composite; in addition, because no preheating measures are used , the refrigeration effect of the alloy powder core rod can easily lead to premature cooling of the molten metal, forming casting defects such as insufficient pouring, cold shut, shrinkage cavity, etc., and the performance is greatly limited

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