The composition performance of tungsten copper points on electrical life experiment table
|
Experiment material |
Hardness (HV10) |
Density (g / cm³) |
Conductivity (* 106S / m) |
Gas content(*10-6) |
|
W70Cu30 |
175-200 |
14-14.5 |
21-27 |
＜35（O2+N2） … |
|
W80Cu20 |
250-280 |
16.7-17 |
16-20 |
|
|
W90Cu10 |
210-250 |
15.2-15.6 |
18-23 |
A TDR-40A vacuum single-grains furnace can be employed to measure the electrical erosion. Tungsten copper points is used for a contact material, which act as a cathode material, and has been polishing after being processed into metallographic sample, pure tungsten of Φ = 2mm is acting as a anode material, placing the two electrodes into a vacuum furnace. Then energize DC (Direct Current) voltage between the anode and the cathode, which is 8000V to get higher stability. Therefore, with the speed of 0.2mm / min, the cathode will rise slowly to make it close to the anode until the arc between the anode and the cathode can ignite, a precision of 0.1mg analytical balance is used for weight loss measurement of samples, arc each 30 times, and the total number of arc times is 300 times around.
A 1000-B-type scanning electron microscope is used for scanning electrical erosion of morphology, and a electron spectroscopy for changes analysis on sample composition.
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