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Cold spray device and method for preparing metal composite gradient quasicrystal coating

A metal composite and cold spraying technology, which is applied to the surface coating device, spray device, liquid spray device, etc., can solve the problems of coating brittleness and phase change, and achieve the effect of uniform gradient distribution of the coating

Inactive Publication Date: 2014-07-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a cold spraying device and method for preparing metal composite gradient quasicrystal coatings, to solve the problems of coating brittleness and phase transition in the prior art

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  • Cold spray device and method for preparing metal composite gradient quasicrystal coating

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Embodiment 1

[0050] In this embodiment, the deposition on the surface of the aluminum alloy substrate: a composite gradient quasicrystalline coating of metallic Al powder and quasicrystalline Al-Cu-Fe powder, the process parameters are as follows:

[0051] The spraying distance is 10mm, the gas pressure is 3.0MPa, the gas temperature is 600℃, the gas flow rate is 20g / s, the powder particle size is 30μm, the weight ratio of metal Al powder and quasicrystalline Al-Cu-Fe powder is 1:1, Al The heating temperature of the powder is 50°C, and the heating temperature of the Al-Cu-Fe powder is 600°C. During the entire spraying process, the sprayed particles remain solid, fly at a high speed of 500-1200m / s and hit the substrate surface of the workpiece, undergoing strong plastic deformation and depositing on the surface of the workpiece substrate to form a metal composite gradient quasicrystalline coating with a coating thickness of 3000 microns .

[0052] In this embodiment, in the composite coating of...

Embodiment 2

[0054] In this embodiment, a composite gradient quasicrystalline coating of metallic Cu powder and quasicrystalline Al-Cu-Cr powder is deposited on the surface of a titanium alloy substrate. The process parameters are as follows:

[0055] The spraying distance is 20mm, the gas pressure is 2.0MPa, the gas temperature is 650℃, the gas flow rate is 25g / s, the powder size is 40μm, the weight ratio of metal Cu powder and quasicrystalline Al-Cu-Cr powder is 1:3, Cu The heating temperature of the powder is 200°C, and the temperature of the Al-Cu-Cr powder is 600°C. During the entire spraying process, the sprayed particles remain solid, fly at a high speed of 500-1200m / s and hit the substrate surface of the workpiece, undergoing strong plastic deformation and depositing on the surface of the workpiece substrate to form a metal composite gradient quasicrystalline coating with a thickness of 4000 microns .

[0056] In this embodiment, in the composite coating of quasicrystalline powder and ...

Embodiment 3

[0058] In this embodiment, the deposition on the surface of the stainless steel substrate: metal Zn powder and quasicrystalline Al-Cu-Fe-Cr powder composite gradient quasicrystalline coating, the process parameters are as follows:

[0059] The spraying distance is 30mm, the gas pressure is 4.0MPa, the gas temperature is 700℃, the gas flow rate is 30g / s, the powder size is 10μm, and the weight ratio of metal Zn powder and quasicrystalline Al-Cu-Fe-Cr powder is 1:5 , Zn powder is at room temperature, Al-Cu-Fe-Cr powder heating temperature is 600 ℃. During the entire spraying process, the sprayed particles remain solid, fly at high speed and hit the surface of the workpiece substrate, undergo strong plastic deformation, deposit the surface of the workpiece substrate, and form a metal composite gradient quasicrystalline coating with a thickness of 5000 microns.

[0060] In this embodiment, in the composite coating of quasicrystalline powder and metal powder, along the thickness directi...

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Abstract

The invention relates to the field of surface coating preparation and particularly relates to a cold spray device and method for preparing a metal composite gradient quasicrystal coating. A quasicrystal powder feeder and a metal or alloy powder feeder of the device are respectively connected to a gas-solid mixing chamber through a pipeline to form a dual-channel powder feeding structure, a quasicrystal heater and a metal or alloy powder heater are respectively arranged on the pipelines, a gas heater is connected with the gas-solid mixing chamber through a pipeline and a supersonic flow nozzle is arranged at an outlet of the gas-solid mixing chamber. One path of the gas source compressed gas enters into the quasicrystal powder feeder, one path enters into the metal powder feeder, and one path enters into the heater, the gas and the powders enter into the supersonic flow nozzle via the gas-solid mixing chamber to form gas-solid dual-phase flow, solid particles in the gas-solid dual-phase flow are injected onto the surface of a workpiece and generate severe plastic deformation and finally deposit on the surface of the workpiece. The method provided by the invention can solve the problems of fragility and phase change and the like of coatings, and can be used for preparing two-component or multi-component alloy quasicrystal gradient coatings of various series.

Description

Technical field [0001] The invention relates to the field of preparation of surface coatings, in particular to a cold spraying device and method for preparing metal composite gradient quasicrystalline coatings. Background technique [0002] Since Shechtman et al. first discovered quasicrystals, people have conducted extensive and in-depth research on them. Quasicrystalline materials are a type of intermetallic compound between periodic structure and disordered structure. The special structure makes quasicrystalline materials have high hardness, high elastic modulus, low expansion coefficient, low friction coefficient and good wear resistance. , Low conductivity, low thermal conductivity, good thermal insulation, non-stickiness, excellent oxidation resistance and other good comprehensive properties. However, due to the brittleness of the quasicrystalline material itself, its application is greatly restricted. How to combine the excellent properties of metals and quasicrystalline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05B7/14B05B7/16B05B7/26B05D5/00B05D7/14
Inventor 吴杰金花子沈艳芳李鸣熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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