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A thermal spray composite powder and its preparation method and application

A composite powder, thermal spraying technology, applied in the direction of coating, fusion spraying, metal material coating process, etc., can solve the problems of reduced overall performance of the coating, uneven powder mixing, poor uniform dispersion effect, etc., to achieve solid Lubrication performance is exhibited, Ag loss is reduced, and uniformity is high.

Active Publication Date: 2018-10-16
王海斗
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the thermal spray powder prepared by mechanical powder mixing method has many disadvantages, mainly including the following two aspects: (1) uneven powder mixing: due to NiCrAlY, Cr 2 o 3 and Ag have densities of 2.96g / cm 3 , 5.2g / cm 3 , and 10.5g / cm 3 , with a large difference in proportion
Therefore, the uniform dispersion effect of the powder system with a large difference in specific gravity by mechanical powder mixing is poor, which in turn affects the uniformity of the prepared coating composition distribution and reduces the overall performance of the coating; (2) Sublimation of Ag: the melting point of Ag is 961.78°C, the boiling point is only 2262°C, and Cr 2 o 3 The melting point is 2266°C; this means that the thermal spraying mixed powder prepared by the mechanical powder mixing method must adjust the spraying process parameters so that the Cr 2 o 3 The powder is close to or reaches a molten state, but at this time the Ag powder is vaporized due to the high temperature; the silver content of the formed coating is significantly reduced, which makes the solid lubricating effect of the coating worse

Method used

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  • A thermal spray composite powder and its preparation method and application
  • A thermal spray composite powder and its preparation method and application
  • A thermal spray composite powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A thermal spray composite powder, the thermal spray composite powder comprises the following components by mass percentage:

[0085] NiCrAlY powder 78%

[0086] Cr 2 O 3 Powder 15%

[0087] Ag powder 7%;

[0088] Among them, the average particle size of NiCrAlY powder is 900nm; the Cr 2 O 3 The average particle size of the powder is 60 nm; the average particle size of the Ag powder is 1 μm.

[0089] The preparation method of the thermal spray composite powder is as follows: image 3 As shown, the preparation method comprises the following steps:

[0090] (1) Mix the stainless steel ball, NiCrAlY powder and deionized water in a mass ratio of 25:1:1.5, and put them into the ball mill tank; in the ball mill tank, feed an inert gas with a flow rate and air pressure of 0.2 MPa, and the injection time is 20 minutes; set the rotation speed of the ball mill to 500 rpm, ball mill for 13 hours, add 15 g of tributyl phosphate in the initial stage of ball milling, and add 5...

Embodiment 2

[0109] A thermal spray composite powder, the thermal spray composite powder comprises the following components by mass percentage:

[0110] NiCrAlY powder 74.5%

[0111] Cr 2 O 3 Powder 16.5%

[0112] Ag powder 9%;

[0113] Among them, the average particle size of NiCrAlY powder is 800nm; the Cr 2 O 3 The average particle size of the powder is 100 nm; the average particle size of the Ag powder is 800 nm.

[0114] The preparation method of the thermal spray composite powder is as follows: image 3 As shown, the preparation method comprises the following steps:

[0115] (1) Mix the stainless steel ball, NiCrAlY powder and deionized water in a mass ratio of 22.5:1:1.35, and put them into the ball mill tank; the inert gas with a flow rate and air pressure of 0.2MPa is introduced into the ball mill tank, and the introduction time is 20 minutes; set the rotation speed of the ball mill to 450 rpm, and mill the ball for 14 hours. In the initial stage of ball milling, add tribu...

Embodiment 3

[0119] A thermal spray composite powder, the thermal spray composite powder comprises the following components by mass percentage:

[0120] NiCrAlY powder 81.5%

[0121] Cr 2 O 3 Powder 13.5%

[0122] Ag powder 5%;

[0123] Among them, the average particle size of NiCrAlY powder is 1000nm; the Cr 2 O 3 The average particle size of the powder is 80 nm; the average particle size of the Ag powder is 1200 nm.

[0124] The preparation method of the thermal spray composite powder is as follows: image 3 As shown, the preparation method comprises the following steps:

[0125] (1) Mix stainless steel balls, NiCrAlY powder and deionized water in a mass ratio of 27.5:1:1.65, and put them into a ball mill; the inert gas with a flow rate and air pressure of 0.2 MPa is introduced into the ball mill, and the introduction time is 20 minutes; set the rotation speed of the ball mill to 650 rpm, and mill the ball for 15 hours. In the initial stage of ball milling, add tributyl phosphate a...

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Abstract

The invention provides thermal spraying composite powder and a preparation method and functions thereof. The thermal spraying composite powder mainly comprises the following components of, in percentage content by mass, 74.5-81.5% of NiCrAlY powder, 13.5-16.5% of Cr2O3 powder and 5-9% of Ag powder, wherein the average particle size of the NiCrAlY powder, the Cr2O3 powder and the Ag powder is required to be smaller than 5 microns independently. The thermal spraying composite powder is prepared through two-step composite powder preparation processes of ball-milling crushing and spraying drying. All the components in the thermal spraying composite powder are uniformly dispersed, and the problem of burning loss of the Ag in the spraying process can be avoided. The thermal spraying composite powder can be used for preparing a wear-resistant composite solid lubricating coating in thermal spraying and particularly suitable for surface protection of mechanical equipment and components which operate in extremely harsh working conditions of a high temperature, a high speed, a heavy load and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying, and particularly relates to a thermal spraying composite powder and a preparation method and application thereof. Background technique [0002] Thermal spray powder is a dispersion system composed of a large number of powder particles. There are various preparation methods for thermal spray powder, mainly including the following six: gas atomization method, water atomization method, smelting pulverization method, sintering pulverization method, polymerization pulverizing method and coating method. The preparation method of the thermal spray powder can be used to manufacture various powder systems such as metals (alloys) or ceramics. Usually, the preparation method of thermal spray powder needs to be reasonably selected according to the structure and use of the powder. [0003] With the wide application of thermal spray coatings in various fields, traditional single or simple component ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/073B22F9/08
CPCB22F9/082C23C4/06
Inventor 王海斗马国政何鹏飞陈书赢王海军刘明
Owner 王海斗
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