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
CN1421278AInactive Publication Date: 2003-06-04INST OF MECHANICS - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF MECHANICS - CHINESE ACAD OF SCI
Publication Date
2003-06-04
Estimated Expiration
Not applicable · inactive patent

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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.
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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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