Abstract
Porous tungsten is a refractory metal commonly used to manufacture dispenser cathode pellets. To produce the required geometric shape of a cathode, precision machining of the emitting surface is necessary. Because dry machining leads to excessive tool wear and smearing of surface pores, a plastic infiltrant is used to both prevent smearing and lubricate the cut. In order to develop a sustainable alternative to this plastic infiltration process, infiltrant-free cryogenic machining of porous tungsten has been identified by previous studies to be capable of producing excellent levels of surface porosity [1-3]. Cryogenic cooling during machining of porous tungsten allows for controlled brittle fracture machining, leading to relatively poor surface roughness [3]. Consequently, improving the surface quality of cryogenically machined porous tungsten surfaces is a necessary condition for the successful implementation of this technology.
Original language | English |
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Title of host publication | Proceedings of 2015 IEEE International Vacuum Electronics Conference, IVEC 2015 |
ISBN (Electronic) | 9781479971107 |
DOIs | |
State | Published - Aug 25 2015 |
Event | 16th IEEE International Vacuum Electronics Conference, IVEC 2015 - Beijing, China Duration: Apr 27 2015 → Apr 29 2015 |
Publication series
Name | Proceedings of 2015 IEEE International Vacuum Electronics Conference, IVEC 2015 |
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Conference
Conference | 16th IEEE International Vacuum Electronics Conference, IVEC 2015 |
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Country/Territory | China |
City | Beijing |
Period | 4/27/15 → 4/29/15 |
Bibliographical note
Publisher Copyright:© 2015 IEEE.
Keywords
- cryogenic machining
- cutting edge radius
- dispenser cathode
- porous tungsten
- surface integrity
ASJC Scopus subject areas
- Electrical and Electronic Engineering