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Method for cold-spraying preparation of ZrO2-CeO2 ceramic coating

A ceramic coating and cold spraying technology, which is applied in the direction of pressure inorganic powder coating, etc., can solve difficult problems such as coating structure and morphology, coating cracking and damage, and degradation of matrix mechanical properties.

Inactive Publication Date: 2013-05-01
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] We know that ceramic materials generally do not have plastic deformation ability at room temperature, so it is still difficult to obtain pure ceramic coatings by cold spraying.
The preparation of some ceramic coatings often requires the use of metal material fillers or binders. Ceramic particles are often embedded in the metal matrix by mechanical force. During the coating application process, the ceramic particles are easy to peel off, resulting in accelerated wear of the friction pair and the coating surface.
At the same time, the mechanical combination between ceramic particles and the metal substrate is the source of coating cracks, which can cause rapid cracking and damage of the coating, and sometimes lead to a decrease in the mechanical properties of the substrate after spraying.
[0005] At present, there are no more than two methods of depositing cold sprayed ceramic coatings at home and abroad: one is by adding metal fillers (such as adding Co, Al to WC). 2 o 3 Add Al to the final preparation of cermet coating or composite coating, this method will change the composition of the ceramic material; the other is to prepare ceramic coating by vacuum cold spraying or dynamic gel method, the thickness of the coating is difficult It is higher than 20 μm, and because it is carried out under harsh conditions such as vacuum, it is difficult to control and adjust the coating structure and morphology, and is not suitable for high-efficiency mass production
At present, the technology of preparing pure ceramic coatings under open conditions using traditional cold spraying technology has not been reported at home and abroad, but research in this field has attracted widespread interest from academic and industrial circles. The technical research methods such as coating dynamic gel, vacuum cold spraying and nano-deposition can be seen.

Method used

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  • Method for cold-spraying preparation of ZrO2-CeO2 ceramic coating
  • Method for cold-spraying preparation of ZrO2-CeO2 ceramic coating
  • Method for cold-spraying preparation of ZrO2-CeO2 ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 powder sol-gel coating process

[0052] Weigh Ce(NO3)2.6H2O and polyethylene glycol 400 at a molar ratio of 1:2; put the polyethylene glycol into a beaker, put it in a constant temperature water bath at 80°C, and fully dissolve the cerium nitrate into the mixture by stirring. Polyethylene glycol 400; keep stirring until a transparent colloid is formed; in order to control the Zr: Ce in the coating powder to be 10:1 molar ratio, weigh a quantitative amount of ZrO 2 Mixed into the gelatin formed in the above steps for continuous stirring to form a well-mixed gel;

[0053] Clean the gel with absolute ethanol at room temperature and filter; put the rubber cake in a muffle furnace and bake at 500°C for 1.5 hours to obtain CeO 2 Coated ZrO 2 Powder; cooled to room temperature and then milled in a corundum jar to obtain a yellow powder.

Embodiment 2

[0054] Embodiment 2 The whole process of coating preparation

[0055] (1) Powder ball milling treatment

[0056] Grinding balls: 30 large (10mm) + 60 medium (8mm) + 90 small (5mm) balls

[0057] Powder: 10mol.%CeO 2 +ZrO 2 Powder 20g (initial ZrO 2 Powder coated CeO by sol-gel process 2 )

[0058] The ball milling speed was 200r / min, and after ball milling for 20 hours, the XRD detection powder grain size was 11nm, and the amorphous component content was 16%.

[0059] Spray granulation: temperature 225°C, sphericity 85%, particle size D90=18μm.

[0060] (2) Cold spray deposition process

[0061] Working gas: Nitrogen (N 2 ), gas temperature: 550°C, pressure: 29 atmospheres (calculated powder particle velocity is 639m / s), powder feeding speed: 14g / min, powder preheating temperature: 350°C, spraying distance: 30mm, spray gun sweeping speed : 100mm / s, two sprays.

[0062]Obtained coating: deposition efficiency 45%; porosity 1.1%; thickness 38 μm, tensile bonding strengt...

Embodiment 3

[0064] (1) Powder ball milling treatment

[0065] Grinding balls: 30 large (10mm) + 60 medium (8mm) + 90 small (5mm) balls;

[0066] Powder: 10mol.%CeO 2 +ZrO 2 Powder 20g (initial ZrO 2 Powder coated CeO by sol-gel process 2 );

[0067] The ball milling speed was 180r / min, and after 20 hours of ball milling, the XRD detection powder grain size was 11nm, and the amorphous component content was 16%.

[0068] Spray granulation: air inlet temperature 225°C, sphericity 85%, particle size D90=18μm.

[0069] (2) Cold spray deposition process

[0070] Working gas: helium (He), gas temperature: 350°C, pressure: 15 atmospheres (calculated powder particle velocity is 781m / s), powder feeding speed: 10g / min, powder preheating temperature: 300°C, spraying Distance: 30mm, spray gun sweeping speed: 150mm / s, two sprays.

[0071] Obtained coating: deposition efficiency 60%, porosity 0.9%, thickness 40μm, bonding strength 54MPa.

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Abstract

The invention provides a method for cold-spraying preparation of a ZrO2-CeO2 ceramic coating and belongs to the technical field of cold-spraying preparation of ceramic coatings. The method comprises the following steps of mixing ZrO2 and CeO2 powder according to a mole ratio of (3-10): 1, carrying out dry ball milling to obtain ZrO2-CeO2 mixed powder which has an average grain size of 10 to 15nm and comprises 5 to 20% by molar mass of amorphous powder, preheating the ZrO2-CeO2 mixed powder at a temperature of 300 to 400 DEG C, and carrying out cold spraying of the ZrO2-CeO2 mixed powder on the surface of a base material to obtain the ZrO2 / CeO2 ceramic coating, wherein cold spraying conditions comprise that nitrogen or helium is used as work gas; a temperature of the work gas is in a range of 350 to 550 DEG C; pressure is 10-29 atmospheres; and a distance between a spray gun outlet and a deposited base material surface is in a range of 30 to 50mm. The method modifies the common method that a cold-sprayed ceramic composite coating is obtained usually by utilization of a plastic metal filler, and utilizes a ceramic powder nanocrystallization and non-crystallizing technology to realize preparation of the ZrO2-CeO2 ceramic coating having porosity less than 1.2%, deposition efficiency more than 40%, and coating interface bonding strength of 30 to 55MPa. The method has simple processes and is suitable for industrial production.

Description

technical field [0001] The invention discloses a method for preparing a zirconia / cerium oxide ceramic coating by cold spraying, belonging to the technical field of cold spraying ceramic coating preparation. Background technique [0002] The traditional thermal spraying process mainly relies on material melting and rapid solidification, and material oxidation, decomposition or structural changes are inevitable. Cold spraying technology is a new type of coating deposition technology. The cold spraying process mainly relies on the high-speed (300-2000m / s) collision of high-kinetic energy powder particles (5-50μm) at room temperature, and the conversion of kinetic energy to thermal energy at the collision interface In order to achieve the purpose of forming a metallurgical bond between the powder particles and the matrix and the powder particles to obtain a coating. Because the deposition of cold sprayed coatings mainly depends on the high strain of plastic particles (10 6-9 / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04C04B35/624C04B35/628
Inventor 熊玉明李松林王磊熊翔
Owner CENT SOUTH UNIV
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