Rapid testing device for toughness of thermal spraying coating and utilization method

Abstract

The invention discloses a rapid testing device for the toughness of a thermal spraying coating. The rapid testing device comprises a base, a guide groove, a pressurizing screw rod, a pressurizing block, a pressurizing rod and a supporting rod, wherein the base comprises two end faces which are connected oppositely and a connection face for connecting the two end faces; a groove body capable of containing a coating test piece is formed in the inner side of one end face; a guide groove with the direction which is the same as the connection direction of the two end faces is formed in the side wall of the groove body; two through holes which are symmetrically distributed on the two sides of the guide groove are formed in the side wall of the groove body; the through holes are used for accommodating the supporting rod; the pressurizing screw rod is mounted on the other end face; the pressurizing screw rod is fixedly connected with the pressurizing block; the pressurizing block is fixedly connected with the pressurizing rod; and the axial directions of the pressurizing block, the pressurizing rod and the supporting rod are the same and the pressurizing block, the pressurizing rod and the supporting rod are arranged in the guide groove. Meanwhile, the invention further provides a method for utilizing the device. According to the rapid testing device and the method, a phenomenon that a load is not uniform and the repeatability is poor can be avoided; and the binding force and the toughness of the thermal spraying coating are rapidly and simply tested.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and more specifically relates to a thermal spray coating toughness rapid testing device and a using method. Background technique [0002] Thermal spraying coating is a coating formed by heating metal or non-metallic materials to a molten or semi-molten state by using a certain heat source (such as electric arc, plasma arc, combustion flame, etc.), and then spraying it onto the surface of the pretreated substrate at a certain speed. Floor. Since the combination of the thermal spray coating and the substrate is mainly mechanical bonding, metallurgical bonding accounts for a small proportion, and the thermal expansion coefficient, hardness and other parameters of the coating and the substrate are different, so the bonding force and toughness of the coating are important. assessment indicators. [0003] At present, the viscose method is mainly used to test the binding force. For details, ...

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Problems solved by technology

[0003] At present, the viscose method is mainly used to test the binding force. For details, refer to GB / T8642-2002. Although this method can quantitatively test the binding force, due to the high requirements for the sample, poor test repeatability, and long cycle, Therefore not suitable for rapid test assessment

For the toughness test of thermal spray coatings, there are mainly drop hammer method, indentation method, etc., but these methods have the problems of complex testing and long cycle time

In addition, the bending method has been widely used as a more commonly used qualitative method to test the bonding force and toughness, but there is no standard device and sample reference for this method, and manual bending samples are mostly used, which has problems of uneven loading and poor repeatability. question

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