A kind of preparation method of mutually immiscible copper-carbon supersaturated solid solution

Abstract

The invention relates to a material surface processing technology, in particular to a preparation method for a mutual-non-solid-solute Cu-C supersaturated solid solution. A composite material base body is prepared through the powder metallurgy method, and then irradiation treatment is conducted on the material surface using high current pulsed electron beams (HCPEBs) for preparing composite material containing the copper-carbon supersaturated solid solutions. It is showed that through observation with a scanning electron microscope and a transmission electron microscope, various crystal defects and ultrafine-grained structures are induced through the HCPEB irradiation technology to provide passages for diffusion among Cu and C atoms; x-ray analysis energy spectrum shows that the (111) Cu peak deviates towards the low angle area, and the diffraction peak of C declines, so it is known that part of C atoms are made to be solidly dissolved into a Cu lattice successfully, and the solid solubility is up to 2.24% at utmost through calculation.

Description

technical field [0001] The present invention relates to a material surface processing technology, in particular to a method for preparing a mutually immiscible copper-carbon supersaturated solid solution. They do not dissolve or react with each other to form alloy phases, specifically for the preparation of Cu-C supersaturated solid solutions. Background technique [0002] For the mutually insoluble Cu-C system, the compatibility between the two is extremely poor, and the interface is almost non-wetting (θ=170º), resulting in neither chemical reaction nor diffusion reaction between Cu-C, so Cu-C over The amount of dissolved carbon in the saturated solid solution is greater than the solid solution in the equilibrium state, which belongs to the solid solution in the metastable state; during the friction process, the carbon atoms solid-solved into the copper lattice are precipitated due to extrusion and heat A relatively stable lubricating film is formed on the friction surfac...

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Problems solved by technology

[0003] For mutually insoluble systems with little solid solubility or positive heat of mixing under equilibrium conditions, such as Cu-Cr, Cu-Nb, Cu-Fe, Cu-Ag, etc., supersaturated solid solutions can be formed by certain means. Its solid solubility is increased by dozens or even hundreds of times, realizing solid solution at the atomic level; one of the common methods is to use mechanical alloying: through high-energy ball milling, the powder is subjected to repeated deformation, cold welding, and crushing to reach the atomic level between elements The complex physical and chemical process of alloying leads to Cu-C supersaturated solid solution, and the powder metallurgy method is a commonly used manufacturing method for Cu-C composite parts due to its advantages of simple process, high material utilization rate and low energy consumption; But in fact, copper and carbon in powder metallurgy copper-based composite materials are only mechanically interlocked, and the interfacial bonding force is very low. The sintering performance of the powder is reduced; in order to improve the compatibility of copper and carbon, the diffusion between Cu and C atoms can be promoted through crystal defects, so as to obtain Cu-C supersaturated solid solution, so as to enhance the bonding between copper and carbon interfaces

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