INFLUENCE OF THE MICROSTRUCTURE OF ELECTRODE MATERIALS ON THE MOTION BEHAVIORS OF VACUUM ARC CATHODE SPOT

Acta Metall Sin

2004, Vol. 40

Issue (12): 1269-1273 DOI:

Research Articles

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INFLUENCE OF THE MICROSTRUCTURE OF ELECTRODE MATERIALS ON THE MOTION BEHAVIORS OF VACUUM ARC CATHODE SPOT

WANG Yaping;ZHANG Hui; DING Bingjun;SUN Jun

Shenyang National Laboratory for Materials Science; Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016

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WANG Yaping; ZHANG Hui; DING Bingjun; SUN Jun. INFLUENCE OF THE MICROSTRUCTURE OF ELECTRODE MATERIALS ON THE MOTION BEHAVIORS OF VACUUM ARC CATHODE SPOT. Acta Metall Sin, 2004, 40(12): 1269-1273 .

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Abstract Role of the microstructure of cathode materials in the geometrical parameter and migration process of cathode spot is studied on the basis of the observation of microscopic trace of vacuum arc without external magnetic field. Arc erosion pattern shows that spot craters locate on the phases with weak voltage withstanding, whose size, morphology and distribution determine the character of the arc spots. For the cathode alloys with ultra-fine microstructure the spot is dispersed and moves quickly on the cathode surface, indicating the spot motion is controlled by the microstructure of the electrode materials. The spot migration mode changes from the jumping motion to a continuous one when the microstructure scale is less than the spot size. It is concluded that the constituent phases and their sizes are the important factor dominating the microscopic migration mode of arc cathode spots.

Key words: electrode material microstructure vacuum arc

Received: 10 October 2003

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