A (TiC+CaF2)/gamma-Ni composite material coating and a plasma transferred arc deposition preparing method thereof

Abstract

The invention discloses a (TiC+CaF2) / gamma-Ni in-situ self-generating wear-resistant self-lubricating composite material coating and a plasma transferred arc deposition preparing method thereof. The coating comprises following chemical components: 42.5-46.25 wt% of Ti, 10.63-11.56 wt% of C, 31.88-34.69 wt% of Ni and 7.5-15 wt% of CaF2. The coating adopts TiC as a wear-resistant reinforcing phase, adopts the CaF2 as a solid lubricating phase, adopts gamma-Ni as a base phase, and is synthesized in situ by utilization of a plasma transferred arc deposition technology. The coating is characterized by compact coating structure, fine crystal grains, good metallurgical bonding with substrates, and excellent wear resistance and antifriction performance. The coating and the plasma transferred arc deposition preparation technology thereof can be widely applied for surface wear-resistant antifriction reinforcing processing for molds of nonferrous metal cold deformation processing devices and have a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a (TiC+CaF 2 ) / γ-Ni in-situ self-generated wear-resistant self-lubricating composite coating and its transfer plasma arc cladding preparation method. Background technique [0002] According to the medium and long-term railway network plan approved by the State Council, the operating mileage of my country's railway network will reach more than 120,000 kilometers in 2020, and the electrification rate will exceed 60%. Copper alloy contact wire is the most critical component in electrified high-speed railway catenary. It not only requires high strength and high conductivity, but also has extremely high requirements for surface dimensional accuracy, shape accuracy and surface finish. In the initial stage of the development of electrified high-speed railways in my country, contact wires for electrified high-speed railways have always relied on imports. In recent years, my country h...

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Problems solved by technology

The thickness, hardness and wear resistance of the modified layer prepared by surface carburizing, nitriding and carbon-nitriding processes cannot adapt to the harsh working conditions of high contact stress and strong wear of the mold; thermal spraying with mechanical bonding as the main bonding method Coating, due to the relatively low bonding strength between the coating and the substrate, cannot meet the requirements of use; laser cladding technology is widely used in the synthesis and preparation of high-performance coatings, but due to high equipment costs, low energy conversion efficiency, and high use costs , so it is difficult to promote and apply it on a large scale in the civil industry in the short term

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