A diamond particle reinforced aluminum-based brake wear-resistant composite material and its preparation method

Abstract

The invention relates to a diamond particle-reinforced aluminum-based brake wear-resistant material and a preparation method thereof, belonging to the field of wear-resistant materials. It is characterized in that the surface-modified 5-15μm diamond particles are mixed with Al-Cu alloy powder and placed in a forming mold. After vacuuming, use high-pressure gas to drive Al-Cu at 750-950°C and 0.1-2.0MPa. Si alloy melt infiltration forming, heat preservation and pressure holding for 5-30min, obtained composite material with a volume fraction of reinforcing phase of 5-25% applied to brake wear-resistant parts; realized precise control and optimization of the two-phase interface and microstructure of the composite material, Ensure that the excellent performance of the reinforced phase is stable and fully exerted under actual braking conditions. Compared with traditional steel materials, the composite material prepared by the present invention has significantly reduced density and greatly improved thermal conductivity while optimizing friction and wear characteristics, meeting the needs of braking materials and components for the development of transportation equipment in the direction of higher speed and lighter weight. Brand new requirement.

Description

technical field [0001] The invention belongs to the field of wear-resistant materials, and in particular provides a diamond particle-reinforced aluminum-based composite material for brake wear-resistant parts and a preparation method thereof. Background technique [0002] Brake wear-resistant materials are an important field of wear-resistant materials. At present, the most important application is to manufacture brake parts (such as brake discs, brake drums, etc.) of transportation equipment. An important functional component for reliable braking, so high-performance brake wear-resistant materials and related brake components have become key technologies to improve equipment safety, comfort, and high performance. [0003] Traditional brake components are mainly made of steel materials such as cast iron, cast steel or forged steel. With the continuous and rapid development of transportation equipment represented by high-speed railway trains in the direction of high speed, li...

AI Technical Summary

Problems solved by technology

Although it involves the use of diamond as a reinforcing phase, it does not clearly explain and explain its core role and realized functionality; more importantly, it addresses a core issue of diamond as a reinforcing phase of metal matrix composites, that is, the relationship between diamond and aluminum matrix The optimization of the two-phase interface does not provide a solution. Due to the chemical characteristics of the surface of diamond particles determined by the special crystal structure, it is difficult to obtain the ideal two-phase combination and interface morphology in the process of forming a composite material with aluminum. It will lead to the use of composite materials, especially in the braking process dominated by tangential force, the diamond particles are easily separated from the metal matrix and cannot play the design function of the reinforcement phase, which will eventually cause the braking performance to decrease or even the braking failure. Greatly restrict the practical application of related materials

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