Ceramic-reinforced metal-matrix composite with optimized particle size and preparation method and application thereof

Abstract

The invention provides a ceramic-reinforced metal-matrix composite with an optimized particle size and a preparation method and application thereof, and belongs to the technical field of wear-resistant materials. The ceramic-reinforced metal-matrix composite with the optimized particle size comprises a metal base material and reinforcement-phase ceramic particles. The volume content of a reinforcement phase in the ceramic-reinforced metal-matrix composite with the optimized particle size is 20%-50%. The particle size of the reinforcement-phase ceramic particles is one or the combination selected from 1-0.1 [mu]m, 0.1-1 mm and 1-5 mm. The composite is prepared through a liquid-phase sintering method. The preparation method is simple in process and low in cost, various reinforcement mechanisms including a staggered reinforcement mechanism, a Orowan reinforcement mechanism, a hardening reinforcement mechanism, a deposition reinforcement mechanism and the like are adopted for the composite, and the reinforcement mechanisms generated by changes of the matrix microstructure interact to achieve excellent mechanical performance of the whole composite.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant materials, and in particular relates to a ceramic-reinforced metal-matrix composite material with an optimized particle size and its preparation method and application. Background technique [0002] Ceramic particle reinforced metal matrix composites (MMC S ) usually have higher specific strength and specific stiffness than the matrix material, showing broad application prospects in industries, defense and transportation and other sectors. With the deepening of the research on particle-reinforced metal matrix composites, it can be found that particle shape, particle volume content, matrix properties and particle size have an important influence on the preparation of ceramic particle-reinforced iron-based alloy composites. Among them, the size of the reinforcing particles has a significant impact on the microscopic deformation mechanism, strength, and fracture of the heterogeneous material ...

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Problems solved by technology

However, because of its small particle size, it is easy to produce a small interface between the ceramic particles and the substrate. When the substrate is worn and concave, it is easy to fall off as a whole; ceramic particles in the range of 1 mm to 5 mm are currently less studied. On the one hand, due to large The wetting angle between some ceramic particles and the metal matrix is ​​relatively large, which is prone to interface mechanical occlusion and hole defects during the preparation process, and the overall particle falls off during use; on the one hand, due to the large ceramic particles reinforced metal matrix composites It is easy to produce brittle cracks during the preparation process or during use, resulting in fracture failure, but because it is the main wear-resistant phase, the effect of the composite use mechanism of large particles is more prominent

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