Coating spraying method for sample matrix for coating material in-situ tensile observation

Abstract

The invention discloses a coating spraying method for a sample matrix for coating material in-situ tensile observation. The coating spraying method comprises steps of: wrapping a first fixed segment by a first shielding layer and inserting a first fixing pin in a first locating hole so as to fix the first shielding layer, wrapping a second fixed segment by a second shielding layer and inserting asecond fixing pin in a second locating hole so as to fix the second shielding layer; performing sandblasting on a spray surface of a connection segment; putting multiple sample matrixes experiencing sandblasting in a fixture; and spraying the spray surface by a supersonic plasma device. The costing spraying method can spray on a small-size sample matrix, so that the small-size sample matrix can beput under a scanning electron microscope to observe, crack generation and expansion mechanism in tensile of the coating material and damage mechanism of the material can be better analyzed.

Description

technical field [0001] The invention relates to the field of coating testing and testing, in particular to a coating spraying method for a sample substrate used for in-situ tensile observation of 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 ...

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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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