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Laminar flow plasma spraying equipment and method

A technology of plasma and spraying equipment, which is applied in the direction of liquid spraying equipment, spraying equipment, liquid spraying equipment, etc., to achieve the effects of increasing the preheating temperature range, controlling oxidation, and improving interface bonding force

Inactive Publication Date: 2003-06-04
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to control the generation of plasma jets with high aspect ratios, it is necessary to balance and control various factors in the generation process, and there are many unsolved key problems in related technologies

Method used

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  • Laminar flow plasma spraying equipment and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: Laminar decompression plasma jet is used to prepare zirconia ceramic or aluminum oxide coating on the surface of stainless steel substrate. Table 1 Experimental parameters Spraying, powder feeding gas Ar powder feeding gas flow rate (cm 3 / s) 8 total air flow (cm 3 / s) 180 Vacuum chamber air pressure (Pa) 1.3×10 4 Input power (kW) <8 Deposition distance (mm) 200~220 Substrate initial temperature (K) 600~900

[0036] In the embodiment of the present invention, the substrate is 1Cr18Ni9Ti stainless steel. Powder is ZrO 2 -8mol%Y 2 o 3 Ceramic powder, the particle size of which is less than 25 μm. The diameter of the anode outlet is 20mm. The laminar jet reaches a length of 600mm and a diameter of about 25mm. The relevant spraying experimental parameters are listed in Table 1.

[0037] After generating a stable laminar plasma jet, turn on the powder feeding gas valve and the power switch of the powder feeder for powder feeding to realize laminar plas...

Embodiment 2

[0038] Embodiment 2. Atmospheric pressure laminar flow plasma jet is used to prepare a metal or ceramic coating on the material surface. The workpiece can be installed on the tool holder and workpiece holder of the lathe, and the transmission device of the lathe is used as the workpiece transmission frame. The generator outlet diameter is 6mm. When the output power of the power supply is 9kW, the total air flow is 200cm 3 / s under the condition of argon plasma jet flow, the flow rate of powder supply gas is 6cm 3 / s. The powder is supplied outside the gun. The alumina powder with a particle size of less than 100 μm and the yttria-stabilized zirconia powder with a particle size of less than 25 μm can be fed into the jet high-temperature zone and fully melted.

Embodiment 3

[0039] Embodiment 3, preparation of composite coating material and gradient coating.

[0040] In the embodiment of the present invention, the substrate is 1Cr18Ni9Ti stainless steel. A powder is ZrO 2 -8mol%Y 2 o 3 Ceramic powder, the particle size of which is less than 25 μm. Another powder is NiCrAlY 2 o 3 Powder, the particle size of which is less than 25-75 μm. The diameter of the anode outlet is 20mm. The laminar jet reaches a length of 600mm and a diameter of about 25mm. The relevant spraying experimental parameters are listed in Table 1.

[0041] After generating a stable laminar plasma jet, turn on the powder feeding gas valve and the power switch of the powder feeder for powder feeding to realize laminar plasma spraying. ZrO 2 -8mol%Y 2 o 3 The ceramic powder adopts powder feeding in the gun, NiCrAlY 2 o 3 The powder gun delivers powder outside. When preparing the composite coating, the powder feeding amount of the two powders should be kept constant. ...

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Abstract

The present invention is laminar flow plasma spraying equipment and method. A laminator flow plasma generator with different powder feeding modes, inside the gun or outside the gun and single port ormultiple ports, is used. While maintaining the laminar flow plasma jetting state in small power, air flow rate is increased to raise the heat efficiency of the jet. According to powder sort, materialproperty and particle size, proper jet energy and distribution and carrying air flow rate are selected to obtain high-quality coating. The present invention has les sintroduced impurity, high jet energy utilization, capacity of spraying high-smelting point coating at relatively low power condition, less oxidation of non-oxide coating and full heating of the powder material.

Description

technical field [0001] The invention relates to a method and a device for spraying with long straight laminar arc plasma. The method and device can spray the coating of high melting point substance under the condition of low input power, effectively control the coating structure and increase the deposition rate. Background technique [0002] At present, the thermal plasma jet used for spraying is generally in a turbulent flow state. Changing the structure and production parameters of the spray gun can only change the energy density of the jet to a certain extent, and it is difficult to significantly change the energy distribution of the jet. For a particular spray gun, the jet length does not vary much over the range of available plasma generation parameters. This is because the jet in the turbulent state will seriously entrain the surrounding cold gas, and the energy of the jet will be quickly dissipated in the mixing with the surrounding cold gas, so that the effective hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05B5/06B05B5/08B05B7/22B05C1/06B05D1/08C23C4/134
Inventor 吴承康潘文霞马维
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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