A core-shell structure ceramic composite powder for thermal spraying and its preparation method

A core-shell structure, ceramic composite technology, used in coatings, melt spraying, metal processing equipment, etc., can solve problems such as difficulty in meeting high-temperature thermal protection performance, inability to uniformly disperse two phases, and damage to exothermic coating performance. , to achieve the effect of improving the anti-combustion flow erosion performance, improving the anti-ablation performance, and improving the fracture toughness

Active Publication Date: 2022-05-10
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to YSZ, Al 2 o 3 Compared with Cu, Ni, etc., there are large differences in thermophysical properties such as melting point and thermal conductivity. The agglomerated powder prepared by mechanical mixing or ordinary spray granulation technology is very easy to volatilize in the high-temperature jet during the plasma spraying process. As a result, the actual composition of the coating deviates greatly from the initial design value, resulting in the inability of the two phases in the coating to disperse uniformly and a substantial increase in the content of defects such as pores due to the burning of the second metal phase, making the final exothermic coating The performance is damaged, it is difficult to meet the requirements of high temperature thermal protection performance

Method used

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  • A core-shell structure ceramic composite powder for thermal spraying and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing a core-shell structure ceramic-metal composite powder for thermal spraying is carried out as follows:

[0041] (1) Under the premise of protecting the inner core powder, the shell is thinned. Through the volume formula and density calculation of the sphere, it is obtained that in the composite powder of the core-shell structure, the content of the nano-scale ceramic shell powder is 5~25ωt%. The content of the second metal phase in the medium is 5~50ωt%;

[0042] (2) According to the content of the second metal phase in the inner core of 30ωt%, YSZ powder with a particle size of 1~3μm and Cu powder are mixed and added to the PVA solution with a concentration of 0.5ωt%, so that the entire powder The solid content is 60ωt%, and the ball milling is performed at a speed of 350rpm for 2 hours to form a uniform slurry;

[0043] (3) Spray and granulate the ball-milled slurry, the inlet temperature is 330°C, the outlet temperature is 120°C, the rotation s...

Embodiment 2

[0050] A method for preparing a core-shell structure ceramic-metal composite powder for thermal spraying is carried out as follows:

[0051] (1) Under the premise of protecting the inner core powder, the shell is thinned. Through the volume formula and density calculation of the sphere, it is obtained that in the composite powder of the core-shell structure, the content of the nano-scale ceramic shell powder is 5~25ωt%. The content of the second metal phase in the medium is 5~50ωt%;

[0052] (2) The content of the second metal phase in the inner core is 20ωt%, and Al with a particle size of 1~3μm 2 o 3 Mix the powder and Ni powder into the PVA solution with a concentration of 0.5ωt%, so that the solid content of the whole powder is 45ωt%, and ball mill for 5 hours at a speed of 150rpm to form a uniform slurry;

[0053] (3) Spray granulate the slurry after ball milling, the inlet temperature is 320°C, the outlet temperature is 110°C, the rotation speed of the peristaltic pump...

Embodiment 3

[0060] A method for preparing a core-shell structure ceramic-metal composite powder for thermal spraying is carried out as follows:

[0061] (1) Under the premise of protecting the inner core powder, the shell is thinned. Through the volume formula and density calculation of the sphere, it is obtained that in the composite powder of the core-shell structure, the content of the nano-scale ceramic shell powder is 5~25ωt%. The content of the second metal phase in the medium is 5~50ωt%;

[0062] (2) According to the content of the second metal phase in the inner core of 10ωt%, YSZ powder and NiCrAlY powder with a particle size of 1~3μm are mixed and added to the PVA solution with a concentration of 0.5ωt%, so that the ball is completely powdered The solid content of the mixture is 50ωt%, and the ball milling time is 2 hours at 300rpm to form a uniform slurry;

[0063] (3) Spray granulate the slurry after ball milling, the inlet temperature is 300°C, the outlet temperature is 120°...

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Abstract

A core-shell ceramic composite powder for thermal spraying, characterized in that: the ceramic-metal core of the ceramic composite powder is composed of a ceramic-metal core and a ceramic shell, the particle size of the composite powder is 20-80 μm, and the ceramic-metal core is Composed of ceramic materials and metal materials, the ceramic material is YSZ or Al with a particle size of 1-3 μm 2 o 3 , the metal material is any one of Cu, Ni, NiCrAlY, NiCoCrAlY, the shell is made of oxide ceramics with a particle size of 300~500nm, and the thickness is 1~5μm. The ceramic / ceramic-metal composite powder of the present invention effectively alleviates the burning loss of the second metal phase with a low melting point during the high-temperature spraying process, improves the bulk density and cohesive strength of the inner core, and enhances the fluidity of the powder. The metal second phase in the inner core effectively improves the fracture toughness of the coating, thereby improving the flame erosion resistance of the coating; during use in high temperature environments, the second metal phase with a low melting point effectively improves the burning resistance of the coating corrosion performance.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a core-shell ceramic composite powder for thermal spraying and a preparation method thereof. Background technique [0002] With the continuous improvement of the performance of solid rocket motors, the service environment of hot-end components such as nozzles, combustion chambers, and gas rudders has become increasingly harsh. Working in a scour (3Ma~5Ma) environment, so more stringent requirements are put forward for the materials of the hot end parts. In order to improve the service life of the hot end components, it is necessary to prepare a coating with heat insulation and anti-ablation properties on the surface for protection. As traditional thermal protective coating materials, YSZ, Al 2 o 3 It has the advantages of high melting point, high specific strength and stable physical and chemical properties, but its low fracture toughness limits its application in su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/134B22F1/16B22F1/065B22F9/14
CPCC23C4/06C23C4/134B22F9/14B22F1/16
Inventor 吴护林白懿心李忠盛黄安畏宋凯强丛大龙彭冬詹青青张敏
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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