Composite ceramic Raoult nozzle for cold spray coating

A composite ceramic, cold spray technology, applied in the direction of spray device, spray device, etc., can solve the problems of expensive, bonding, etc., and achieve the effects of high speed, high airflow speed, and high drag efficiency

Active Publication Date: 2007-04-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also nozzles made of cemented tungsten carbide, but they are very expensive
And the above nozzles are prone to bonding at the throat when spraying metal materials with low melting point

Method used

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  • Composite ceramic Raoult nozzle for cold spray coating
  • Composite ceramic Raoult nozzle for cold spray coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The outer wall 7 of the Laval type cold spray nozzle is a fully stabilized zirconia ceramic with 3.5 mol% yttria, and the boron nitride ceramic is the cold spray nozzle for the throat and the inner wall 8 of the diffusion section. The length of the diffuser section 4 is 10 mm, the length of the equal-diameter section of the throat is 6 mm, a / b is 5, and the ratio of the diameter of the throat 2 to the diameter of the nozzle outlet is 1:2.5. Spraying aluminum-zinc alloy powder, the particle size range is 100-300μm. The spraying process parameters are: nitrogen pressure 2.5MPa, temperature 400°C. The experimental results are: the average velocity of the particles is 600m / s, no throat sticking occurs, no oxidation occurs to the particles, and the deposition efficiency is 85%.

[0043] It is worth pointing out that the conventional cold spraying technology prepares aluminum-zinc alloy powder coating, the highest particle size is less than 100μm, the gas pressure is above 3...

Embodiment 2

[0045] The outer wall 7 of the Laval type cold spray nozzle is alumina ceramics, and the boron nitride ceramic is the cold spray nozzle of the throat and the inner wall 8 of the diffusion section. The length of the diffuser section 4 is 15 mm, the length of the equal-diameter section of the throat is 7 mm, a / b is 6, and the ratio of the diameter of the throat 2 to the diameter of the nozzle outlet is 1:3. Spray titanium powder, the particle size range is 200-300μm. The spraying process parameters are: nitrogen pressure 3.0MPa, temperature 400°C. The experimental results are: the average velocity of the particles is 800m / s, no throat sticking occurs, the particles do not oxidize, and the deposition efficiency is 80%.

[0046] It is worth pointing out that when conventional cold spray nozzles prepare titanium powder coatings, the largest particle size is less than 100 μm, the gas pressure is above 3.5 MPa, and the deposition efficiency is about 80%. Because the nozzle manufact...

Embodiment 3

[0048] The outer wall 7 of the Laval type cold spray nozzle is 5mol% yttrium oxide fully stabilized zirconia ceramics, and the boron nitride ceramic is the cold spray nozzle of the throat and the inner wall 8 of the diffusion section. The length of the diffuser section 4 is 10 mm, the length of the equal-diameter section of the throat is 8 mm, a / b is 6, and the ratio of the diameter of the throat 2 to the diameter of the nozzle outlet is 1:2.8. Spray copper powder, the particle size range is 10-100μm. The spraying process parameters are: nitrogen pressure 3.5MPa, temperature 800°C. The experimental results are: the average velocity of the particles is 1200m / s, no throat sticking occurs, the particles do not oxidize, and the deposition efficiency is 92%.

[0049] Compared with conventional cold spray nozzles, conventional cold spray nozzles require the average velocity of particles to reach 1200m / s, and the nitrogen pressure used must be above 4.0MPa. To reduce the pressure, h...

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Abstract

A supersonic laval nozzle made of composite ceramic for spraying out high-speed superfine particles for cold spray coating is composed of a convergent segment based on a particular curve, a throat segment which is an isometric straight segment, and an axially symmetric clliptical segment. There is smooth transitien between adjacent two segments.

Description

(1) Technical field [0001] The invention relates to a nozzle, in particular to a Laval type supersonic nozzle for cold spraying. (2) Background technology [0002] Cold air power spraying (cold spraying for short) technology is a spraying technology based on the principle of aerodynamics. Its principle is to use high-pressure gas to carry powder particles into the high-speed airflow, and generate supersonic two-phase flow through the zoom tube (supersonic nozzle). After being accelerated by a supersonic nozzle, the particles hit the substrate in a completely solid state, and are deposited on the surface of the substrate to form a coating by generating strong plastic deformation. The high-pressure gas is divided into two paths from the gas source, one path enters the powder feeder to carry powder particles; the other path enters the heater and is heated to increase the speed of the airflow. Different from thermal spraying technology, cold spraying does not form high temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05B1/02
Inventor 张俊宝史弼宋洪伟
Owner BAOSHAN IRON & STEEL CO LTD
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