Nondestructive detection system for vacuum acoustic emission

Abstract

The invention discloses a nondestructive detection system for vacuum acoustic emission. The nondestructive detection system comprises an in-situ stretcher, a sample matrix, a scanning electron microscope, a computer system, an acoustic emission detection probe, a signal amplifier and a signal processor, wherein the sample matrix is fixed on the in-situ stretcher; the scanning electron microscope is provided with a vacuum sample bin; the in-situ stretcher is arranged in the vacuum sample bin; the computer system is connected with each of the scanning electron microscope and the in-situ stretcher; the acoustic emission detection probe is arranged in the vacuum sample bin and is in contact with the sample matrix; the signal amplifier is arranged outside the vacuum sample bin and is connectedwith the acoustic emission detection probe through a cable; and the signal processor is connected with the signal amplifier. According to the nondestructive detection system for vacuum acoustic emission, the cracking processes of coating materials can be detailedly observed while realizing the nondestructive detection of acoustic emission, so that benefit is brought to analyze the initiation and expansion mechanism of cracks of the coating materials in the stretching process and the damage mechanism of the materials.

Description

technical field [0001] The invention relates to the field of nondestructive testing, in particular to a vacuum acoustic emission nondestructive testing system. Background technique [0002] In related technologies, the detection of mechanical properties of coating materials and the exploration of damage mechanisms are usually carried out on a macro scale by using a universal tensile testing machine. The image correlation method measures the strain change on the front surface of the coating. [0003] Since the coating materials are mostly prepared by plasma spraying or physical vapor deposition, due to the particularity of the spraying method, the spraying thickness of the coating material may be limited. For example, the spraying thickness of some ceramic coating materials is generally several In the range of ten microns to several millimeters, due to the small thickness, it is difficult to observe the cracking process of the coating material in detail even with a high-reso...

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Problems solved by technology

[0003] Since the coating materials are mostly prepared by plasma spraying or physical vapor deposition, due to the particularity of the spraying method, the spraying thickness of the coating material may be limited. For example, the spraying thickness of some ceramic coating materials is generally several In the range of ten microns to several millimeters, due to the small thickness, it is difficult to observe the cracking process of the coating material in detail even with a high-resolution camera at the macro scale, and it is impossible to effectively observe the coating material during the stretching process. The mechanism of crack initiation and propagation in medium and the damage mechanism of materials

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