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Densification preparation method for hot spray of controllable components and structural coatings on internal surfaces of part

An inner surface, thermal spraying technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of reducing gas protection effect, coating oxidation and decomposition, density reduction, etc., and achieves easy industrial application. Promote, improve the coating density, the effect of the method is simple and controllable

Active Publication Date: 2016-06-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since oblique incidence enhances the oxidation behavior of sprayed particle deposition, compared with vertical incidence deposition, the coating deposited by high-velocity flame spraying oblique incidence in the atmospheric environment still has obvious oxidation, decomposition, and density reduction. Implement effective protection and improvement measures in the oblique incidence deposition process of spray coating
At present, gas protection spraying tooling is mainly aimed at vertical-incidence thermal spray deposition, and is not fully suitable for oblique-incidence thermal spray deposition that requires tilting of the spray gun. The tilting operation of the spray gun results in differences in the distance between the protective gas nozzles on both sides of the gun barrel and the surface to be processed. It can cause problems such as obvious differences in the flow of shielding gas in local areas of the deposition surface, thereby reducing the effect of shielding gas
In addition, the reported vertical incidence deposition process of metal-coated particles uses heterogeneous metal coating to change the phase composition of the raw material powder, and the problem of self-oxidation of the metal coating layer still exists, which is not conducive to improving the coating density and bonding strength.

Method used

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  • Densification preparation method for hot spray of controllable components and structural coatings on internal surfaces of part
  • Densification preparation method for hot spray of controllable components and structural coatings on internal surfaces of part
  • Densification preparation method for hot spray of controllable components and structural coatings on internal surfaces of part

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Embodiment 1

[0030] Utilize the present invention to prepare 300 μ m thick to have WC hard phase and metal Ni composite material coating at the inner surface of the 17-4PH martensitic stainless steel disc-shaped part diameter 30mm central through hole of thick 25mm, diameter 200mm, preparation step is as follows: first Perform routine cleaning on the surface of the 17-4PH martensitic stainless steel substrate to remove surface oil and impurities, and use 60 mesh corundum sand for 10 seconds / cm 2 ;Adopt 88% WC hard phase and 12% metal Ni composite powder with a particle size of 15-38 μm, and deposit a 0.5 μm continuous and dense nanocrystalline metal Ni coating layer on the surface of the composite powder by electroless plating; adopt HVOF The atmosphere protection thermal spraying system of high-speed flame spraying equipment, the protection gas delivery device is connected with the spray gun and has a pure copper integrated gas shield with a water-cooled structure to deliver nitrogen gas, ...

Embodiment 2

[0032] Utilize the present invention to prepare 300 μ m thick coating with TiC hard phase and Ni-based self-fluxing alloy composite material coating on the inner wall surface of the 1Cr13 martensitic stainless steel square tube part hole with a side length of 50 mm and a height of 50 mm. The preparation steps are as follows: first The surface of 1Cr13 martensitic stainless steel parts to be treated is cleaned routinely, and the surface oil and impurities are removed by sandblasting with 40 mesh corundum sand for 10 seconds / cm 2 ; Using a composite powder with a particle size of 20-50 μm and a mass percentage of 80% TiC hard phase and 20% Ni-based self-fluxing alloy phase, a 2 μm continuous and dense Ni-based self-fluxing alloy layer is deposited on the surface of the composite powder by magnetron sputtering Coating: The atmosphere protective thermal spraying system equipped with HVOF high-speed flame spraying equipment is adopted. The protective gas delivery device consists of ...

Embodiment 3

[0034] Utilize the AISI304L austenitic stainless steel circular sleeve parts inner wall with an inner diameter of 100 mm, a length of 50 mm, and a wall thickness of 10 mm to prepare a 300 μm thick 75% Cr 3 C 2 The composite material coating of hard phase and NiCr metal phase, the preparation steps are as follows: First, do routine cleaning treatment on the surface of AISI304L austenitic stainless steel substrate to remove surface oil and impurities, and use 40 mesh corundum sand for 10 seconds / cm 2 ; The particle size is 15-45μm and the mass percentage is 75% Cr 3 C 2 Composite powder of hard phase and 25% NiCr metal phase, using magnetron sputtering method to deposit 1μm continuous and dense NiCr alloy coating on the surface of composite powder; using atmosphere protection thermal spraying system equipped with HVOF high-speed flame spraying equipment, protective gas The conveying device consists of 6 main gas nozzles with 6mm diameter uniformly distributed pure copper pip...

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Abstract

The invention relates to a densification preparation method for hot spray of controllable components and structural coatings on internal surfaces of a part, belonging to the technical field of material surface engineering. The method comprises the following steps: in an atmospheric environment, using an atmosphere protection hot spray system to perform oblique incident spray on internal surfaces of holes, grooves and other geometric structures of a metal part so as to prepare ceramic-metal composite coatings; performing metal cladding pretreatment on raw material powder in the particle size range of 5-100 mu m to form cladding composite powder for spray, wherein the metal cladding has a thickness of 0.1-5 mu m, is continuous and compact and is the same as or similar to the metal phase of the raw material powder in the composition aspect; and during spray, using a protective gas conveying device to introduce nitrogen or argon so as to prepare internal surface hot spray coatings having favorable consistency with the sprayed powder components and phase structures, few pore defects and high bonding strength. The method inhibits the oxidation and decomposition of the sprayed powder, reduces oxidation and decomposition reaction gas-phase products, improves the surface melting state of the sprayed powder, promotes the deposition densification and meets the manufacturing requirements for the internal surface coatings of holes, grooves and the like of the part.

Description

technical field [0001] The invention relates to a densification preparation method for thermal spraying of controllable components and structural coatings on the inner surface of parts, to obtain a dense coating with the same or close to the composition and phase structure of the sprayed powder, and to meet the requirements of inner surface coatings of metal parts such as holes and grooves. Preparation requirements belong to the technical field of material surface engineering. technical background [0002] Thermal spraying technology mainly includes high-velocity flame spraying (HVOF, HVAF, etc.), plasma spraying, oxyacetylene flame spraying, arc spraying (WireArcSpraying), etc. Metals (including pure metals and alloys), ceramics and ceramic-metal composites prepared by these technologies Coatings provide protective properties such as wear resistance, corrosion resistance, erosion resistance, fatigue resistance, and oxidation resistance for key components of major equipment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129
Inventor 朱小鹏王桂芹杜鹏程潘学民雷明凯
Owner DALIAN UNIV OF TECH
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