Plasma spray particle parameter online measurement apparatus

Abstract

The invention discloses a plasma spray particle parameter online measurement apparatus. The apparatus comprises a heat window sheet, heat radiation light emitted by a single flight particle in a plasma jet, after passing through the heat window sheet, is divided into two optical paths through a spectroscope, the particle heat radiation light on a transmission optical path, after passing through a first bandpass filter plate, is focused to a chip of a first monochrome CCD camera through a first lens, and a particle flight locus within the wave band scope of the first bandpass filter plate is obtained; and the particle heat radiation light on a reflection optical path, after passing through a high-reflectivity reflector and passing through a second bandpass filter plate, is focused to a chip of a second monochrome CCD camera through a second lens, a particle flight locus within the wave band scope of the second bandpass filter plate is obtained, and the two monochrome CCD cameras are connected with a computer for monitoring parameters of particles in an online mode. The apparatus provided by the invention can realize online measurement of the temperature, the speed and the particle size of the single flight particle, rules of temperature change of the single particle in a flight process and distribution of temperatures, speeds and particle sizes of multiple particles.

Description

Technical field [0001] The invention relates to the technical field of plasma spraying particle parameter measurement, in particular to an online measurement device for plasma spraying particle parameters. Background technique [0002] Thermal barrier coatings and protective coatings prepared by plasma spraying are widely used on blades of aero-engines and gas turbines to increase the service life of the blades. There are many process parameters that affect the spraying of coatings prepared by plasma spraying and they are mutually coupled, and it is difficult to achieve precise control of coating quality and repeatable production. The essential parameters that affect the quality of the coating are the temperature, speed, and particle size of the flying particles. By monitoring the parameters of the particles online, the problem of multiple process parameters can be transformed into the three parameters of controlling the temperature, speed, and particle size of the particles. Th...

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Problems solved by technology

[0003] There are two types of existing flying particle parameter measurement devices: DPV2000 can only measure a single particle parameter at a time, and the measurement period is long; It is difficult for such a measuring device to obtain the temperature change law during the flight of a single particle, and it cannot complete the statistical analysis of the temperature distribution, velocity distribution, and particle size distribution of multiple particles at the same time. The reaction process between solid and powder particles is very important, and it is also very important to monitor the temperature distribution, velocity distribution and particle size distribution of multiple particles at the same time to control the coating quality

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