Sample substrate for in-situ tensile observation system for coating materials

Abstract

The invention discloses a sample substrate for a coating material in-situ stretching observation system, which comprises a first fixed segment, a second fixed segment and a connecting segment, whereinthe connecting segment is connected between the first fixed segment and the second fixed segment; the width of the first fixed segment is equal to the width of the second fixed segment and is greaterthan that of the connecting segment; the connecting segment is provided with a spraying surface; and when at least one of the first fixed segment and the second fixed segment is subjected to a stretching load, the connecting segment and the coating material on the spraying surface are stretched. The sample substrate disclosed in the embodiment of the invention is suitable for being matched with an in-situ stretching machine with a small volume to complete stretching of the coating material, placing in a scanning electron microscope for observation can thus be carried out, and the initiation and propagation mechanism of cracks during the stretching process and the damage mechanism of the coating material can be further analyzed.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a sample substrate used in an in-situ stretching observation system for coating materials. 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 ...

AI Technical Summary

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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