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A kind of shielding method for preparing thermal spray thick coating

A thermal spraying and coating technology, applied in coating, metal material coating process, fusion spraying, etc., can solve problems such as difficulty in satisfying coating performance and production cycle, easy chipping, adhesion of protective tape and coating, etc.

Active Publication Date: 2022-08-09
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low bonding strength of thick coatings and the shape limitations of parts, manual or automatic grinding and trimming of the edges of thermal sprayed thick coatings is not only inefficient, easy to chip, and the trimming angle is difficult to control, it is easy to damage the nearby substrate Surface, difficult to meet coating performance and production cycle requirements
[0003] There is an urgent need for a masking method for preparing thick thermal spray coatings, which can solve the problems of adhesion between protective tape and coating, easy chipping and chipping at the edge of the coating during the preparation of thick coatings

Method used

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  • A kind of shielding method for preparing thermal spray thick coating
  • A kind of shielding method for preparing thermal spray thick coating
  • A kind of shielding method for preparing thermal spray thick coating

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Embodiment Construction

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Preparation of Thick Sealing Coating for Compressor Balance Disc

[0023] Step 1: Perform alcohol scrubbing and degreasing on the surface of the workpiece, use sandblasting protective tape to cover the non-coated parts, use 22-mesh white corundum sand and 0.8MPa press-in sand blasting to roughen the surface of the coated parts, and remove after roughening. Sandblasting protective tape, using clean compressed air to blow clean parts. Spray substrates such as figure 1 As shown, the sprayed substrate 1 can be divided into a non-sprayed zone I, a sprayed transition zone II, and a sprayed zone III.

[0024] step 2, as figure 2 As shown, the surface adjacent to the sprayed surface is protected by protective tape from 4mm away from the edge of the sprayed surface. Extend 1mm to the spray area until it is flush with the edge of the spray area, and trim the edge of th...

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Abstract

A shielding method for preparing a thermal spraying thick coating belongs to the technical field of thermal spraying. The combined protection of metal splicing tooling and multi-layer protective tape is used to mask the non-sprayed parts on the part, and the oversprayed part of the coating in the masked area is removed by peeling off the protective tape during the spraying process, so as to realize the edge of the thick coating The complete and regular transition and the protection of the non-sprayed parts effectively solve the problems of adhesion between the tape and the coating during the preparation of the thick coating, and the edges of the coating are easy to collapse and drop blocks, etc., and significantly improve the product quality and yield. It is suitable for Flame spraying, atmospheric plasma spraying, arc spraying and other thermal spraying processes.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying, and relates to a shielding method for preparing a thermally sprayed thick coating. Background technique [0002] In the preparation process of thermal spray coating, it is necessary to effectively protect the non-sprayed area. At present, the commonly used protective masking methods mainly include tape protection, compound protection and tooling protection. Due to the continuity of the coating on the surface of the mask in the sprayed area and the non-sprayed area, it is easy to cause damage to the edge of the coating during the mask removal process. In addition, there will be a step difference of approximately 90° between the coating and the unsprayed surface, resulting in stress concentration, which is the main part of the coating edge chipping, cracking, and falling off failure. This step difference effect is especially obvious for thermally sprayed thick coatings. . Due to the low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/02C23C4/12
CPCC23C4/02C23C4/12Y02P70/10
Inventor 于月光侯伟骜刘建明沈婕卢晓亮冀晓鹃万伟伟章德铭
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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