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System and method for utilization of shrouded plasma spray or shrouded liquid suspension injection in suspension plasma spray processes

A plasma and suspension technology, which is applied in the direction of liquid injection device, metal material coating process, injection device, etc., can solve the problem of reducing deposition efficiency and so on

Inactive Publication Date: 2014-10-22
PRAXAIR ST TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, ejected particles lead to reduced deposition efficiency

Method used

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  • System and method for utilization of shrouded plasma spray or shrouded liquid suspension injection in suspension plasma spray processes
  • System and method for utilization of shrouded plasma spray or shrouded liquid suspension injection in suspension plasma spray processes
  • System and method for utilization of shrouded plasma spray or shrouded liquid suspension injection in suspension plasma spray processes

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Embodiment Construction

[0032] The present invention relates to novel SPS systems and processes for depositing coating materials. The SPS system and process of the present invention are particularly suitable for depositing submicron particles. The invention is described herein in various embodiments and in conjunction with various aspects and features of the invention.

[0033] The relationship and function of the various elements of the invention are better understood from the following detailed description. The detailed description contemplates various permutations and combinations of features, aspects, and embodiments, which are all within the scope of the invention. The disclosure may thus be recited as comprising, consisting of or consisting essentially of the particular features, aspects and embodiments, or any such combination and permutation of selected one or more of them.

[0034] The present invention recognizes the shortcomings of current SPS systems and processes. See attached Figur...

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Abstract

A system and method for producing thermal spray coatings on a substrate from a liquid suspension is disclosed. The disclosed system and method include a thermal spray torch for generating a plasma and a liquid suspension delivery subsystem for delivering a flow of liquid suspension with sub-micron particles to the plasma to produce a plasma effluent. The liquid suspension delivery subsystem comprises an injector or nozzle which can produce an inert or reactive gas sheath partially or fully surrounding the plasma effluent. A sheath can also be used to isolate injection of the liquid suspension. A gas assist stream can also be employed at or near the suspension injection point. The shroud, sheath or gas assist technique can retain the sub-micron particles entrained within the plasma effluent and substantially prevent entrainment of ambient gases into the plasma effluent. The liquid suspension delivery subsystem can be arranged as an axial injection system, a radial internal injection system or an external radial injection system.

Description

technical field [0001] The present invention relates to suspension plasma spraying, and more particularly to shielding, sheathing, and / or shielding suspension plasma spray effluents or liquid suspensions with inert shields, sheaths, and / or shields of gases methods and systems. [0002] Background technique [0003] Conventional plasma spraying techniques primarily use a powder feeder to deliver powder coating material into the plasma jet of a plasma spray gun. However, this technique is generally limited to the use of particles of at least +350 mesh (ie, a median particle size of about 45 microns with 50% of the particles smaller than the median size and the other 50% larger than the median size). Introducing powder coating material directly into the plasma jet becomes progressively more difficult as the particle size decreases below +325 mesh. Fine particles tend to tightly pack and agglomerate, increasing the potential for clogging in conventional powder feed systems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12
CPCC23C4/127C23C4/12B05B7/205C23C4/121C23C4/123C23C4/134Y10T428/25
Inventor C.A.佩托拉克D.J.勒门A.富伊尔斯泰因T.F.路易斯三世M.麦科伊
Owner PRAXAIR ST TECH INC
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