Integration equipment and detection method for evaluating coating bonding strength based on interface fracture toughness

Abstract

The invention discloses integration equipment and a detection method for evaluating coating bonding strength based on interface fracture toughness, belonging to the technical field of material surface engineering. With the equipment, a computer is used for controlling operation of four functional modules, including an ultrasonic detection module, a hardness testing module, a continuous press-in testing module and an interface crack detecting module; a man-machine interactive software system is used for processing acquisition and transmission of data of the functional modules and analysis operation and data display and output of an interface press-in mechanical model in an integrated manner; and through ultrasonic nondestructive measurement on elasticity modulus of a coating and a matrix and continuous press-in testing on a coating-matrix interface, quantitative detection on all parameters of an interface fracture toughness formula is completed in one equipment, and the critical load PC of coating-matrix interface fracture and the corresponding interface fracture toughness Kca are obtained. The equipment and the detection principle are clear, the modular design is beneficial to updating and expanding of a mechanical model library, and a detection sample is simple and convenient to prepare.

Description

technical field [0001] The invention relates to an integrated device and detection method for evaluating coating bonding strength based on interface fracture toughness, which is used for quantitative detection and evaluation of bonding strength of coatings of metals, alloys, ceramics and composite materials with a thickness of more than 100 μm, and belongs to material surface engineering technology field. technical background [0002] In recent years, surface coating technology has continued to develop and has gradually become a key means of manufacturing high-performance parts of major engineering equipment. Anti-fatigue and anti-oxidation protective coatings, as well as functional coatings such as electrical conductivity, magnetic conductivity, thermal conductivity, and electromagnetic shielding. The high reliability and long service life of these parts requires high bonding strength at the coating-substrate interface. At the same time, the thickness of the coating genera...

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Problems solved by technology

[0004] In order to solve the engineering problem of quantitative detection of coating bonding strength, the present invention provides an integrated device and detection method for evaluating coating bonding strength based on interface fracture toughness. The ultrasonic non-destructive quantitative measurement of the amount is combined with the continuous indentation test of the coating-substrate interface. A single water immersion focused ultrasonic probe is used to simultaneously measure the shear wave and longitudinal wave sound velocities of the coating, and then obtain the Poisson's ratio of the coating to realize the elastic modulus of the coating. At the same time, the continuous loading process of the coating-substrate interface indentation test is controlled by the closed-loop acoustic emission signal. When the crack is formed, the loading is stopped according to the preset delay time, which simplifies the indentation test process and realizes the indentation test. Automatic identification of indentation tip cracks in equipment

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