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Graded surface composite interface layer and preparation method thereof

A surface composite material and a composite material technology are applied in the field of surface graded composite material interface layer and its preparation to achieve the effects of strong plastic properties, simple preparation method and enhanced plastic deformation ability

Active Publication Date: 2014-10-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The low interfacial stress state of the surface composite coating is conducive to improving the impact resistance of the coating, but the problem of strong plastic matching at the interface still exists

Method used

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  • Graded surface composite interface layer and preparation method thereof
  • Graded surface composite interface layer and preparation method thereof
  • Graded surface composite interface layer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] Utilize the present invention to prepare on the AISI 304L austenitic stainless steel substrate the interface layer of 150 μm thick WC hard second phase with 5-level hierarchical structure and the surface graded composite material interface layer of Co metal binder phase, the preparation steps are as follows: first, AISI 304L The surface of the stainless steel substrate to be treated is cleaned routinely to remove surface oil and impurities, and is blasted with 80 mesh corundum sand for 10 seconds / cm 2 ; The hard second phase particle size is 12 μm, 6 μm, 2 μm, 500nm, 100nm and the volume ratio of the corresponding hard second phase to the binding phase is 50:50, 60:40, 70:30, 80: 20. Vacuum sintered WC-Co cylindrical electrodes with a series of changes of 90:10, the diameter of the electrodes is 3mm, and the densities are 75%, 70%, 65%, 60%, and 55%; the corresponding electric spark discharge of the above electrodes The single pulse energy is 1J, 0.5J, 0.25J, 0.1J, 0.05...

Embodiment 2

[0027] Utilize the present invention on the 17-4PH martensitic stainless steel substrate to prepare the interface layer of 100 μm thick WC hard second phase and Ni metal binder phase with 4-level hierarchical structure. The preparation steps are as follows: first, 17 - 4PH stainless steel substrate to be treated surface for routine cleaning treatment, remove surface oil and impurities, using 80 mesh corundum sand blasting treatment 10 seconds / cm 2 ; The hard second phase particle size is 10 μm, 5 μm, 2 μm, 400nm and the volume ratio of the corresponding hard second phase to the binder phase is 50:50, 60:40, 70:30, 80:20 A series of changing argon-protected sintered WC-Ni cylindrical electrodes, the electrode diameter is 5mm, and the density is 80%, 80%, 70%, 60%; 1J, 0.5J, 0.2J, pulse width 100μs, 50μs, 50μs, 25μs, pulse current 400A, 400A, 200A, 160A, pulse frequency 100Hz, 100Hz, 500Hz, 500Hz, electrodes relative to 17-4PH martensitic stainless steel substrate The scannin...

Embodiment 3

[0029] Utilize the present invention to prepare on the Ti6Al4V titanium alloy substrate a 200 μm thick surface graded composite material interface layer with a 5-level hierarchical structure TiN hard second phase and a NiTi alloy binder phase. The preparation steps are as follows: first, the Ti6Al4V titanium alloy substrate is to be treated The surface is cleaned routinely to remove surface oil and impurities, and is blasted with 60 mesh corundum sand for 5 seconds / cm 2 ; The particle size of the hard second phase is 20 μm, 10 μm, 4 μm, 1 μm, 200 nm and the volume ratio of the corresponding hard second phase to the binding phase is 35:65, 45:55, 55:45, 65: 35. A series of changes of 75:25 nitrogen protection sintered TiN-Ni60 cylindrical electrodes, the electrode diameter is 5mm, and the density is 80%, 70%, 60%, 50%, 50%; the corresponding electric spark of the above electrodes Discharge single pulse energy is 0.5J, 0.25J, 0.1J, 0.05J, 0.025J, pulse width 50μs, 25μs, 25μs, 20...

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Abstract

The invention discloses a graded surface composite interface layer and a preparation method thereof, and belongs to the technical field of material surface engineering. The graded surface composite interface layer comprises a dispersed hard second phase and a coated metal bonding phase surface composite, the graded surface composite interface layer is prepared as follows: performing spark discharge on a surface composite formed by hard second phase secondary units with a graded structure by use of a composite electrode comprising a hard second phase with the particle diameter of 10nm-50 mum and the density of 50-90%, discharging in an inert or reactive atmosphere, and performing point-by-point and layer-by-layer deposition of the hard second phase secondary units to prepare a graded surface composite. The graded surface composite interface layer uses the hard second phase secondary units with the graded structure to increase the stiffness of the interface layer, and enhances the overall strength of a whole coating; a metal bonding phase can restrain deformation localization during the deformation process, the capacity of plastic deformation of the coating can be enhanced, the coating has matched strong plastic plasticity properties; and the graded surface composite is special in structure, simple in preparation method and easy in industrial application.

Description

technical field [0001] The invention relates to a surface graded composite material interface layer and a preparation method thereof, which are used for wear resistance and impact resistance of metal and metal matrix composite parts, and belong to the technical field of material surface engineering. technical background [0002] With the improvement of wear and impact resistance requirements for key metal parts of major engineering equipment, wear and impact resistant protective coatings, as a main means of protection, are constantly facing new challenges. For example, high-temperature protective coatings for aero-engines, wear-resistant and impact-resistant coatings for nuclear main pump seals and bearing components in nuclear power plants, and anti-scour coatings for molds of wide and thick plate continuous casting machines. Because the strength and toughness of traditional wear-resistant and impact-resistant protective coatings are difficult to balance, high hardness is u...

Claims

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Application Information

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IPC IPC(8): C23C26/02C22C29/00C22C1/05B32B15/01B32B15/04
Inventor 雷明凯朱小鹏朱宝王桂芹李昱鹏
Owner DALIAN UNIV OF TECH
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