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Intelligent gasket with piezoelectric sensor for bolt pre-tightening force test and preparation method of intelligent gasket

A technology of piezoelectric sensor and bolt pre-tightening force, applied in force/torque/power measuring instrument, measuring torque/torsion force during tightening, instrument and other directions, which can solve the problems of insufficient toughness and poor wear resistance of piezoelectric coating materials , to achieve the effect of reducing production cost, reducing corrosion, and easy realization

Pending Publication Date: 2021-12-03
武汉珈联传感科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a smart gasket with a piezoelectric sensor for bolt pretightening force testing, which overcomes the difficulty that existing bolt pretightening force monitoring needs to be plated with piezoelectric materials on the bolts, and is also to overcome piezoelectric Coating materials have insufficient toughness and poor wear resistance

Method used

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  • Intelligent gasket with piezoelectric sensor for bolt pre-tightening force test and preparation method of intelligent gasket
  • Intelligent gasket with piezoelectric sensor for bolt pre-tightening force test and preparation method of intelligent gasket
  • Intelligent gasket with piezoelectric sensor for bolt pre-tightening force test and preparation method of intelligent gasket

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: At 100°C, in an argon and hydrogen environment, plasma etching is performed on the polished gasket; after the etching is completed, the arc discharge method is first used to prepare the hardening layer of the CrN gasket, and the deposition pressure is 0.1 Pa, the current is 50A, the thickness of the coating is 2 microns, and the hardness of the coating is 15GPa; followed by the preparation of the ZnO piezoelectric functional composite layer, first depositing a 0.5 micron Ti crystallization induction layer at 0.3Pa; then depositing 5 at 1-3Pa - ZnO piezoelectric layer of 20 microns, on the basis of the piezoelectric layer, a 2 micron AlCrO protective layer is deposited; finally, a wear-resistant conductive Cr / CrN coating is prepared, with a thickness of 3 microns and a single layer of Cr layer thickness of 3 nanometers , the thickness of the CrN layer is 7 nanometers, the modulation period is 10 nanometers, the insulation resistance is less than 1000 ohms, and ...

Embodiment 2

[0032] Example 2: Perform plasma etching on the polished gasket at 150°C in an argon and hydrogen environment; after etching, first use arc discharge method to prepare CrN gasket hardening layer, and the deposition pressure is 1Pa , the current is 100A, the coating thickness is 3 microns, and the coating hardness is 20GPa; then the ZnO piezoelectric functional composite layer is prepared, first depositing a 2 micron Ti crystallization induction layer at 0.5Pa; then depositing a 20 micron ZnO layer at 3Pa The piezoelectric layer is deposited on the basis of the piezoelectric layer with a 5 micron AlCrO protective layer; finally, the preparation of the wear-resistant conductive Cr / CrN coating is carried out, the thickness is 5 microns, the thickness of the single-layer Cr layer is 10 nanometers, and the thickness of the CrN layer is 10 nanometers, the modulation period is 20 nanometers, its insulation resistance is less than 1000 ohms, and its hardness is 15GPa; after the prepara...

Embodiment 3

[0033] Example 3: At 120°C, in an argon and hydrogen environment, plasma etching was performed on the polished gasket; after the etching was completed, the arc discharge method was first used to prepare the hardening layer of the CrN gasket, and the deposition pressure was 0.5 Pa, the current is 80A, the coating thickness is 2.5 microns, and the coating hardness is 16GPa; followed by the preparation of the ZnO piezoelectric functional composite layer, first depositing a 1 micron Ti crystallization induction layer at 0.4Pa; then depositing a 15 micron Ti crystallization layer at 3Pa ZnO piezoelectric layer, on the basis of the piezoelectric layer, a 2-micron AlCrO protective layer is deposited; finally, a wear-resistant conductive Cr / CrN coating is prepared with a thickness of 4 microns, a single-layer Cr layer thickness of 4 nanometers, and a CrN layer thickness of The thickness is 16 nanometers, the modulation period is 20 nanometers, the insulation resistance is less than 100...

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Abstract

The invention belongs to the technical field of piezoelectric coating materials, and particularly relates to an intelligent gasket with a piezoelectric sensor for a bolt pre-tightening force test and a preparation method of the intelligent gasket, and the intelligent gasket comprises a gasket, and a gasket hardening layer, a ZnO piezoelectric function composite layer and a wear-resistant conductive electrode layer which are sequentially arranged on the surface of the gasket, wherein the gasket hardening layer is a CrN ceramic coating, the ZnO piezoelectric functional composite layer is composed of an induced crystallization layer, a ZnO piezoelectric layer and a protective layer, and the wear-resistant conductive electrode layer is composed of a Cr / CrN multilayer film. The sensor is prepared on the surface of the gasket for the first time, and ultrasonic detection is realized on the gasket; the sensor adopts a multi-layer structure, so that the coating has better hardness, wear resistance and toughness than a conventional piezoelectric coating functionally; and the gasket has the characteristics of corrosion resistance, high wear resistance and high toughness, can ensure that a sensor stably works on the surface of the gasket for a long time, and reduces the failure possibility caused by corrosion and the like.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric coating materials, and in particular relates to an intelligent gasket with a piezoelectric sensor for bolt pretightening force testing and a preparation method thereof. Background technique [0002] Bolt connection is a general term for various threaded fastener connection forms. Compared with welding, riveting, bonding and other connection methods, bolt connection has the advantages of convenient disassembly, strong interchangeability, low cost, and reusability. The reliability of bolted connections is crucial to the normal operation of mechanical equipment and the protection of personal safety. During the service of the bolted connection structure, due to environmental changes such as vibration, impact, and external temperature, the bolted connection may break and loosen, resulting in failure of the bolted connection, which in turn leads to equipment failure, and in severe cases, major saf...

Claims

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Application Information

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IPC IPC(8): G01L5/24C23C14/00C23C14/32C23C14/06C23C14/02C23C14/35C23C14/14C23C14/08
CPCG01L5/246C23C14/0021C23C14/325C23C14/0641C23C14/022C23C14/35C23C14/14C23C14/0036C23C14/086C23C14/08
Inventor 杨兵张俊瓦西里黄家辉
Owner 武汉珈联传感科技有限责任公司
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