Test apparatus for breakdown strength of material

A technology of breakdown field strength and testing equipment, applied in the direction of testing dielectric strength, etc., can solve the problems of low precision, long time consumption, and not equipped with CCD cameras, etc., to achieve strong data accuracy, high degree of automation, and wide range of applications Effect

Inactive Publication Date: 2009-08-05
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

The disadvantages of the above-mentioned measuring equipment and method are: the fixing method of the cathode is simple, and it is difficult to precisely adjust and align it in the three-dimensional direction; the impurity and adsorbed gas on the surface of the sample are removed by heating and cooling under vacuum. This method requires a heating system, and The process takes a long time, and the cleaning effect is not ideal; the traditional worm gear transmission mechanism is adopted, and the approach speed between the cathode and the anode is fast, and the distance between the cathodes is measured with a dial gauge, and the accuracy is low; the test process basically relies on manual and visual inspection The automation of the equipment is low; the equipment is not equipped with a CCD camera, and the cathode spots cannot be observed in real time

Method used

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  • Test apparatus for breakdown strength of material
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Examples

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Embodiment 1

[0026] The present invention measures W-2%ThO 2 The breakdown field strength process of the electrode material is as follows:

[0027] Put W-2% ThO 2 The electrode material is sampled by mechanical processing (such as wire cutting), and then the sample is made into a metallographic sample. After fine polishing, it is placed in a vacuum chamber and fixed on the XYZ three-coordinate support, and the XYZ three-coordinate support is fine-tuned in the three-dimensional space to make the sample plane horizontal And align with the anode. Turn on the vacuum system to keep the vacuum chamber at a high degree of vacuum, the degree of vacuum is not lower than 2×10 -3 Pa. Then start Ar + Gun cleaning system with Ar + Clean the gun for 5 minutes to remove surface impurities and adsorbed gas. Start the DC adjustable power supply, and set the voltage at 8000V as required. Start the hydraulic system power control computer and the CCD camera and range finder control computer. Start the...

Embodiment 2

[0030] like figure 2 As shown, other structures and testing procedures are the same as those in Example 1, except that the fixed anode device 8 is changed to be connected with a stepping motor + ball screw feeding mechanism 18 .

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Abstract

The invention discloses a testing device for material breakdown field strength, which also includes an XYZ three-coordinate support (1), a laser distance measuring instrument (5), and an XYZ three-coordinate support ( 1) and a fixed anode device (8), the fixed anode device (8) is fixed with an anode (4), and the XYZ three-coordinate support (1) is used to fix the tested sample (3) as the cathode; in the vacuum chamber ( 2) A laser distance measuring instrument (5) is arranged on the outside perpendicular to the direction of the XYZ three-coordinate support (1), and the laser distance measuring instrument (5) communicates with the vacuum chamber (2). The invention can carry out precise adjustment and alignment in three-dimensional directions, and can accurately measure the breakdown distance. It can be applied to accurate testing of breakdown field strength and breakdown current of various metal materials or metal matrix composite materials, as well as real-time observation of the occurrence process of cathode spots and the morphology of cathode spots.

Description

technical field [0001] The invention relates to a test device, in particular to a test device for the breakdown field strength of a material. Background technique [0002] Arc plasma technology can be widely used in cutting, thermal spraying, welding, melting, new material synthesis, ultrafine powder preparation, wastewater treatment, space propulsion, etc. The cathode in an arc plasma generator is a key component of this system. The cathode is responsible for emitting electrons and maintaining the stable combustion of the arc. At the same time, it also withstands harsh service conditions such as high-energy ion bombardment and high-temperature ablation. The short service life caused by ablation is a prominent contradiction. Therefore, it is imperative to develop and develop new electrode materials to meet the development needs of plasma technology. The performance of the cathode material depends on its own arc starting performance and arc ablation performance. The arc st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 王发展原思聪
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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