Effect of Zr doping material on the structure and performance of tungsten electrode

Chen Ran; Yang Jiancan; WeiYinhe

doi:10.11884/HPLPB202133.210263

Volume 33 Issue 10

Oct. 2021

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Chen Ran, Yang Jiancan, WeiYinhe. Effect of Zr doping material on the structure and performance of tungsten electrode[J]. High Power Laser and Particle Beams, 2021, 33: 104004. doi: 10.11884/HPLPB202133.210263

Citation:

Chen Ran, Yang Jiancan, WeiYinhe. Effect of Zr doping material on the structure and performance of tungsten electrode[J]. High Power Laser and Particle Beams, 2021, 33: 104004. doi: 10.11884/HPLPB202133.210263

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Effect of Zr doping material on the structure and performance of tungsten electrode

doi: 10.11884/HPLPB202133.210263

Department of Materials and Manufacturing, Beijing University of Technology, Beijing 100020, China

Received Date: 2021-07-09
Rev Recd Date: 2021-10-21

Available Online: 2021-10-26

Publish Date: 2021-10-15

Abstract

Abstract

The W-1.5%La₂O₃-0.1%Y₂O₃-0.1%ZrO₂ and W-1.5%La₂O₃-0.1%Y₂O₃-0.08%ZrH₂ electron emission materials were prepared by the intermediate frequency induction heating sintering method. The density of the sintered sample is about 95.5%. The thermionic emission test results show that the zero field emission current density of the thermionic emission material sample added with zirconium hydride is greater than that of the sample added with zirconia. The analysis illustrates that the added zirconium hydride decomposes during sintering, and the active Zr can capture tungsten. The impurity oxygen in the grain boundary purifies the grain boundary, thereby improving electron emission; Vickers microhardness measurement shows that the hardness of the sample with zirconium hydride added is higher than that of the sample with zirconium oxide. Analysis shows that the addition of zirconium hydride effectively improves the bonding between the tungsten crystal grains and enhances the hardness of the tungsten electron-emitting material. The samples were characterized by SEM, EDS, XRD, metallographic microscope and other surface analysis equipment. The structure shows that the addition of zirconium hydride, compared with the addition of zirconia, not only decreases the size of tungsten grains from 13.63 μm to 11.63 μm, but also decreases the size of the rare earth phase from 1.87 μm to 1.66 μm. This change in organizational structure is conducive to electron emission.
- rare earth tungsten thermionic emission material,
- crystal grain size,
- second phase size,
- thermionic emission,
- zirconium hydride

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References(18)

References

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