The Comparative Experiment of Ce and CeO2 on Tungsten Copper Contacts Properties

Experimental materials: tungsten powder (purity: 99.9%, average particle size: 6-8μm), copper powder (74μm), rare earth elemental Ce (massive, purity: ≥99.95%), rare earth oxide CeO₂ (powder, purity: 99.9 %)

Experimental procedure:
Mixing powder --- because at room temperature, Ce is easily oxidized, therefore, CeO₂powder can be directly mixed with copper and tungsten powder, whereas Ce and copper are added by Infiltration into tungsten blanks.
Pressing --- Pressing, under the pressure of 600MPa, the two mixed powders, preparing a size of 14㎜ * 10mm blanks.
Infiltration --- using infiltration method under the condition of nitrogen protection, temperature is of 1350 ℃ or so, infiltration holding time of 2h, ultimately preparing the tungsten copper contacts by adding Ce rare elemental and tungsten copper contacts by adding rare earth oxide CeO₂, making use of relevant experimental apparatus to get experimental results.

Observing results:
Use HB-3000 Brinell hardness tester to measure hardness. Use ESJ200-4 electronic analytical balance to measure density, which is based on "Experimental Methods of Contact Materials" in GB / T5586-1998. Use 7501-type eddy current conductivity meter to measure conductivity measurements. Use Nephot -II type metallurgical microscope to observe tissue morphology. The qualitative analysis of the composition is measured by using the XRD-700 X-ray diffraction to analyze the sintering samples. And then compare the results.



 

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