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Method for measuring critical speed of cold gas dynamic spraying

A technology of cold air power spraying and critical speed, which is applied to measuring devices, instruments, and mechanical devices, etc., can solve the problems of time-consuming, high-speed, and time-consuming measurements, and achieve the effect of fast measurement speed

Active Publication Date: 2009-09-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the small particle size and high speed of the cold air power spraying, the particle speed measurement is very difficult and requires special equipment, so the measurement is time-consuming and not very accurate. It takes a lot of time to determine the critical speed, and the experimental conditions are also very harsh.
Cold air power spraying has a specific critical velocity for a specific powder and substrate combination, so the critical velocity must be measured before each experiment. The current method is difficult to meet the requirements, and a method for quickly measuring the critical velocity is urgently needed
And the method of directly measuring the speed will produce large errors due to slight changes in the environment and technical parameters, which will adversely affect the stability of the process

Method used

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  • Method for measuring critical speed of cold gas dynamic spraying
  • Method for measuring critical speed of cold gas dynamic spraying
  • Method for measuring critical speed of cold gas dynamic spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 , figure 2 and image 3 As shown, the critical velocity of the cold air dynamic spraying of the copper alloy powder on the copper plate was measured, and the particle size velocity curve and the particle size weight distribution integral curve were drawn. See figure 1 The dotted line in parabolic shape is the distribution curve of powder particle size in microns, and the solid line in the figure is the distribution curve of particle size mass integral. See figure 2 The state parameters of the copper alloy particles were obtained from the particle size versus velocity curves. It can be seen from the figure that the velocity of particles with small particle size is higher, and the velocity of particles decreases gradually as the particle size increases. When the particle size is less than 5 microns, the speed increases with the increase of the particle size, reaches the maximum value at 5 microns, and then decreases rapidly with the increase of the...

Embodiment 2

[0037] The experimental conditions are the same as in Example 1, and the substrate is changed to an aluminum substrate.

[0038] The experimental spraying experiment was carried out, and the deposition rate of the copper alloy particles on the aluminum substrate was 91%. Find this deposition rate value from the vertical axis of the integral curve, and mark the corresponding deposition rate point r on the integral curve 2 , and then mark the velocity point v from the curve of particle size and velocity 2 , the velocity value obtained from the velocity coordinate axis is 506m / s. Therefore, the critical velocity of the combination of the copper alloy particles and the aluminum substrate was measured to be 506m / s. See image 3 .

Embodiment 3

[0040]The experimental conditions are the same as in Example 1, and the substrate is changed to a titanium substrate.

[0041] The experimental spraying experiment was carried out, and the deposition rate of copper alloy particles on the titanium substrate was 76.4%. Find this deposition rate value from the vertical axis of the integral curve, and mark the corresponding deposition rate point r on the integral curve 3 , and then mark the velocity point v from the curve of particle size and velocity 3 , the speed value obtained from the speed coordinate axis is 540m / s. Thus, the critical velocity of the combination of copper alloy particles and titanium substrate was measured to be 540m / s. See image 3 .

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Abstract

The invention discloses a method for measuring the critical speed of cold gas dynamic spraying. The method is characterized in that a group of substrates are combined with particles; and by particle size distribution of the particles, the relation of particle size and speed and the deposition rate of particles in the cold gas dynamic spraying process, the critical speed of cold gas dynamic spraying is measured. Compared with the prior art, the method has the advantages that: the speed of the cold gas dynamic spraying particles does not need to be directly measured; all data adopted is directly obtained from actual engineering application, and the mathematic conversion is made by utilizing the measurement result of the particle size distribution of the particles so as to get the relation of the particle size and the weight; the measurement speed is fast, and the method is applied to various combinations of particles and substrates; and by one test, the critical speed of the particle can be measured.

Description

technical field [0001] The invention relates to a cold air power spraying technology, in particular to a method for quickly measuring critical speeds in actual application of combinations of different powders and different substrates. Background technique [0002] Cold air power spraying technology (referred to as cold spraying) is driven by high-pressure compressed gas to drive tiny metal particles to hit the surface of the base material at high speed. When the speed of the sprayed particles exceeds a specific speed, the sprayed particles will undergo strong plastic deformation on the surface of the material. Bonding, forming a coating on the surface of the base material. This specific speed is called the critical speed. Below the critical speed, tiny metal particles will erode the surface of the material, not only cannot form a coating, but will peel off the surface of the material and cause surface damage, so the critical speed is very important for cold spraying. Howev...

Claims

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Application Information

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IPC IPC(8): G01N15/00G01N19/00
Inventor 张俊宝梁永立
Owner BAOSHAN IRON & STEEL CO LTD