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Thermal spraying device and method for manufacturing quasicrystalline coating

A spraying device and quasicrystal technology, which is applied in coating, metal material coating process, molten spraying, etc., can solve the problems of microcracks, quasicrystal phase accompanied by crystal phase and high porosity of the coating, and achieve the composition phase Uniform distribution, high quasi-crystal purity, and the effect of avoiding changes in crystal structure

Inactive Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a warm spray coating device and method for preparing quasi-crystalline coatings, which solves the problems of high porosity and microcracks in the quasi-crystalline phase accompanied by crystal phases and coatings in the prior art

Method used

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  • Thermal spraying device and method for manufacturing quasicrystalline coating
  • Thermal spraying device and method for manufacturing quasicrystalline coating
  • Thermal spraying device and method for manufacturing quasicrystalline coating

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In this embodiment, the quasicrystalline Al-Cu-Fe powder coating is deposited on the surface of the aluminum alloy substrate, and the process parameters are as follows:

[0047] The spraying distance is 100mm, the oxygen pressure is 0.5MPa, the oxygen flow rate is 200L / mm, the nitrogen pressure is 0.4MPa, the nitrogen flow rate is 200L / mm, the gas C 3 h 8 The pressure is 0.5MPa, the gas flow rate is 50ml / min, the spraying temperature is 1000°C, the particle velocity is 900-1600m / s, the particle size of the quasicrystalline powder is 30-50μm, the powder feeding rate is 20g / min, and the coating thickness is 500μm.

[0048] In this embodiment, the quasicrystalline coating is evenly distributed and compact in structure. The tensile strength of the coating and the substrate is 60MPa, the shear strength is 35MPa, and the purity of the quasicrystalline phase is 98wt%.

Embodiment 2

[0050] In this embodiment, the quasicrystalline Al-Cu-Cr powder coating is deposited on the surface of the titanium alloy substrate, and the process parameters are as follows:

[0051] Spraying distance is 50mm, oxygen pressure is 0.25MPa, oxygen flow rate is 400L / min, nitrogen pressure is 0.15MPa, nitrogen flow rate is 50L / min, gas C 3 h 8 The pressure is 0.25MPa, the gas flow rate is 20ml / min, the spraying temperature is 500°C, the particle velocity is 900-1600m / s, the particle size of the quasicrystalline powder is 10-30μm, the powder feeding rate is 10g / min, and the coating thickness is 1000μm.

[0052] In this embodiment, the quasicrystalline coating is evenly distributed and has a compact structure. The tensile strength of the coating and the substrate is 80 MPa, the shear strength is 50 MPa, and the purity of the quasicrystalline phase is 96 wt%.

Embodiment 3

[0054] In this embodiment, an Al-Cu-Fe-Cr quasicrystalline coating is deposited on the surface of a stainless steel substrate, and the process parameters are as follows:

[0055] The spraying distance is 300mm, the oxygen pressure is 0.75MPa, the oxygen flow rate is 600L / min, the nitrogen pressure is 0.55MPa, the nitrogen flow rate is 300L / mm, the gas C 3 h 8 The pressure is 0.65MPa, the gas flow rate is 100ml / min, the spraying temperature is 1500°C, the particle velocity is 900-1600m / s, the particle size of the quasicrystalline powder is 50-80μm, the powder feeding rate is 30g / min, and the coating thickness is 1500μm.

[0056] In this embodiment, the quasicrystalline coating is evenly distributed and dense in structure, the tensile strength of the coating and the substrate is 70 MPa, the shear strength is 40 MPa, and the purity of the quasicrystalline phase is 97 wt%.

[0057] The results of the examples show that the device of the present invention is simple, easy to operat...

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Abstract

The invention relates to the field of manufacturing of surface coatings, in particular to a thermal spraying device and a thermal spraying method for manufacturing a quasicrystalline coating. A fuel inlet, a spark plug and an oxygen inlet are arranged on one side of a mixing chamber of the thermal spraying device; the other side of the mixing chamber is communicated with a middle mixing chamber; a cooling gas inlet is formed on the middle mixing chamber; middle mixing chamber is communicated with a spray pipe through a supersonic nozzle; and an outlet of the supersonic nozzle and an inlet of the spray pipe are communicated with a quasicrystalline powder inlet. The middle mixing chamber for the cooling gas is added and the flame temperature is reduced, so that the powder and the gas form a gas-solid two-phase flow; solid particles in the gas-solid two-phase flow are sprayed onto the surface of a workpiece, and are plastically deformed seriously and deposited onto the surface of the workpiece; and subsequent particles with high kinetic energy repeat the process and form a quasicrystalline alloy coating. The problems that in the prior art, a crystalline phase is accompanied by a quasicrystalline phase, the porosity of the coating is high and micro-cracks exist are solved; and the thermal spraying device and the thermal spraying method can be used for manufacturing multiple series of quasicrystalline coatings.

Description

technical field [0001] The invention relates to the field of preparation of surface coatings, in particular to a warm spraying device and method for preparing quasi-crystalline coatings. Background technique [0002] Since the first discovery of quasicrystals by Shechtman et al., 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 electrical conductivity, low thermal conductivity, good heat insulation, non-stick, excellent oxidation resistance and other good comprehensive properties. However, due to the brittleness of quasicrystalline materials, their applications are greatly limited. How to combine the excellent properties of metals and quasicrystal materials has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/08C23C4/06C23C4/129
Inventor 吴杰李铁藩金花子崔新宇熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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