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Sensing system for substrate surface failure

A sensing system and substrate technology, applied in the field of sensing systems for substrate surface failure, can solve problems such as distortion, unfavorable application, and weak strength of damage information on the surface coating of parts, so as to achieve high piezoelectric signal strength and improve piezoelectric performance. Effect

Active Publication Date: 2016-10-05
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the use of existing piezoelectric sensors to dynamically monitor the damage status of the surface coating of parts in service has the problem of weak or distorted damage information on the surface coating of parts, which is not conducive to application

Method used

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  • Sensing system for substrate surface failure
  • Sensing system for substrate surface failure
  • Sensing system for substrate surface failure

Examples

Experimental program
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Effect test

preparation example Construction

[0065] The present invention also provides a kind of preparation method of lead titanate coating, comprises the following steps:

[0066] The mixed powder is sprayed on the surface of the substrate and polarized to obtain a lead titanate coating; the mixed powder includes PbTiO 3 powder, PbO powder and Al powder.

[0067] In the present invention, the substrate is preferably a metal substrate, more preferably a 45# steel substrate. That is, the base body can be moving parts of a steam turbine, compressor, or pump, or parts such as gears, shafts, and piston pins (the parts need to be subjected to high-frequency or flame surface quenching), and can be castings. Alternatively, the substrate is a copper substrate or an aluminum substrate, so as to be suitable for components used in other occasions.

[0068] Before spraying the surface of the substrate, the present invention preferably further includes quenching the substrate to increase the hardness of the substrate, and the har...

Embodiment 1

[0116] Provide 45# steel substrate after cleaning with industrial caustic soda to remove surface oil;

[0117] The matrix is ​​quenched, and the hardness reaches about HRC55;

[0118] Use brown corundum with a particle size of 20 mesh as the sand material, and perform sandblasting on the quenched substrate. The sandblasting process includes: the air pressure of sandblasting is 0.6MPa, the angle of sandblasting is 45°, and the distance of sandblasting is 145mm;

[0119] Heat treatment is carried out on the substrate after sandblasting, and the temperature reaches 120°C.

[0120] NiAl alloy powder with a particle size of 30 microns is used to form a primer layer with a thickness of 20 microns on the substrate by supersonic plasma spraying. The spraying process includes: the spraying voltage is 120V, the spraying current is 385A, and the spraying power is 40kW , The spraying distance is 110mm.

[0121] By supersonic plasma spraying, the mixed powder is sprayed on the primer layer...

Embodiment 2～6

[0128] According to the method of Example 1, only the polarization temperature was changed to 60°C, 80°C, 100°C, 140°C and 160°C, respectively to obtain substrates coated with lead titanate.

[0129] The piezoelectric signal of the lead titanate coating was measured as described above. See results Figure 9 ,Depend on Figure 9 It can be seen that the coatings prepared in Examples 1-6 of the present invention have strong piezoelectric signals, and the piezoelectric signal value reaches the maximum when the temperature is close to 120°C.

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Abstract

The present invention provides a sensing system for surface failure of a substrate, comprising: a sensing device; and a signal analysis device for analyzing a signal output by the sensing device; the sensing device includes a sensitive unit, and the sensitive unit It includes: a lead titanate coating covering the surface of the substrate, used to sense and convert the signal of failure of the surface of the substrate; and a first electrode arranged on the lead titanate coating, used to output the failure signal of the surface of the substrate signal; the lead titanate coating is formed by spraying mixed powder on the surface of the substrate and polarized, and the mixed powder includes PbTiO 3 powder, PbO powder and Al powder. Lead titanate (PbTiO 3 ) is a ferroelectric material that can be used to prepare piezoelectric sensors. The present invention adds PbO powder and Al powder to improve the piezoelectric performance of the lead titanate coating. In the sensing system, the coating can be closely combined with the substrate, the piezoelectric signal intensity is high, and the service condition of the parts can be better dynamically monitored.

Description

technical field [0001] The invention relates to the technical field of piezoelectric materials, in particular to a sensing system for surface failure of a substrate. Background technique [0002] In order to improve the wear resistance of some mechanical parts such as gears, pistons and cylinders, wear-resistant coatings are usually provided on the surfaces of these parts. However, during the long-term service of these parts, the congenital primary micro-defects will still accumulate slowly, and may interact with subsequent micro-damages, and eventually turn from quantitative changes to qualitative changes and cause fatal damage. If a definite signal can be obtained before the qualitative change of the part occurs, or the whole process of the cumulative change of the small damage of the part can be accurately grasped, accidents can be avoided as much as possible. [0003] The current fatigue and wear tests on the surface of parts mostly use the changes of vibration, frictio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00C23C24/02
Inventor 邢志国王海斗马国政石伟丽
Owner ACADEMY OF ARMORED FORCES ENG PLA