Device and method for online identifying exposed rate of metal matrix when thermal barrier coating is removed through abrasive water jet

An abrasive water jet, metal matrix technology, applied in used abrasive processing devices, abrasive jet machine tools, abrasives, etc., can solve problems such as leakage, affecting detection accuracy, and achieve a consistent recognition accuracy and removal rate. Effect

Pending Publication Date: 2021-01-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the detection accuracy of the existing exposed rate detection is easily affected by leakage caused by the leakage of the spray liquid, and to invent a method for judging the exposed rate of the metal substrate on-line when the abrasive water jet removes the thermal barrier coating, and at the same time provide a corresponding device

Method used

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  • Device and method for online identifying exposed rate of metal matrix when thermal barrier coating is removed through abrasive water jet
  • Device and method for online identifying exposed rate of metal matrix when thermal barrier coating is removed through abrasive water jet
  • Device and method for online identifying exposed rate of metal matrix when thermal barrier coating is removed through abrasive water jet

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Embodiment 1

[0026] Such as figure 1 shown.

[0027]An online identification device for the exposed rate of metal substrates when abrasive water jets remove thermal barrier coatings, characterized in that it includes an abrasive working fluid tank 1, an infusion pump 2, an infusion pipeline 4, a jet nozzle 7, a nozzle 8, and a workbench 12. Working fluid return device and weak current detection device; workpiece 11 is installed on workbench 12, workpiece 11 is composed of thermal barrier coating 11.1 and metal substrate 11.2, jet nozzle 7 is connected with infusion pump 2 through infusion pipeline 4, The infusion pump 2 is connected with the working fluid tank 1 and pumps the working fluid in the working fluid tank 1 into the jet nozzle 7, and the infusion pipeline 4 connecting the jet nozzle 7 and the working fluid tank 1 is installed with an overflow valve 3 and a pulsation valve. Damper 5 and pressure gauge 6. The nozzle 8 is installed on the jet nozzle 7, and the jet nozzle 7 is made...

Embodiment 2

[0030] Such as figure 1 shown.

[0031] An on-line identification method for the exposure rate of a metal substrate when removing a thermal barrier coating by erosion, comprising the following steps:

[0032] 1. Clamp the workpiece on the insulating fixture, adjust the relative distance (target distance) between the nozzle and the workpiece surface to be processed to 10mm; add the jet working fluid made of abrasive and tap water into the working fluid tank, and the working fluid The abrasive content in the medium reaches 1% mass fraction, and continuous stirring is required to keep the mixture evenly, and the conductivity value of the abrasive working fluid is detected 350μS / cm; use a nozzle with a diameter of 0.6mm;

[0033] 2. Connect the cathode of the DC power supply in the current detection device to the jet nozzle, connect the anode of the DC power supply to the metal substrate of the workpiece, and apply a DC voltage of 100V between the jet nozzle and the metal subst...

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Abstract

The invention discloses a device and method for online identifying the exposed rate of a metal matrix when a thermal barrier coating is removed through abrasive water jet. The device is characterizedby comprising an abrasive working fluid box, a jet spray pipe, a nozzle, a workbench, a working fluid backflow device and a weak current detection device; the jet spray pipe is connected with an infusion pump, and the nozzle is mounted on the jet spray pipe; and the working fluid backflow device comprises a jet flow protection sleeve, a sealing block, a negative pressure pipe with a liquid extraction opening and an air inlet channel in the side face, a backflow pipeline, a working fluid recycling box and an air pump machine, the weak current detection device comprises a direct-current power source, a current recorder, a cable wire and a computer, a positive electrode and a negative electrode of the direct-current power source are connected to the workpiece metal matrix and the jet spray pipe respectively, and the current recorder is connected into a loop in series and transmits collected current data to the computer through the cable wire. By means of the device, the contact between sprayed working fluid and the workpiece metal matrix can be effectively prevented, and the identification accuracy of the metal exposure rate is ensured.

Description

technical field [0001] The present invention relates to an on-line detection technology for the exposed rate of the metal substrate when the thermal barrier coating on the surface of the metal component is removed, especially a technology capable of on-line identification of the exposed rate of the metal substrate when the thermal barrier coating on the surface of the metal component is eroded, specifically The invention relates to an on-line identification device and method for the exposed rate of a metal substrate when an abrasive water jet removes a thermal barrier coating. Background technique [0002] Coating thermal barrier coatings on turbine blades of aeroengines can ensure that they can withstand operating temperatures higher than the limit temperature of their own metal substrates, further improving the thrust-to-weight ratio of turbine gas engines. Because the thermal barrier coating is not conductive, it brings difficulties to the electric discharge machining of ...

Claims

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Application Information

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IPC IPC(8): B24C1/08B24C5/04B24C9/00B24C3/02G08B21/18G08B3/10G01N27/00
CPCB24C1/08B24C3/02B24C5/04B24C9/00G01N27/00G08B3/10G08B21/18
Inventor 刘壮于晓宇高长水刘鑫段超瑞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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