Ion sputter textured graphite electrode plates

US4417175A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Arthur N. Curren · North Ridgeville, US
• Ralph Forman · Rocky River, US
• James S. Sovey · Strongsville, US
• Edwin G. Wintucky · Willoughby, US

Key dates

• Filing date: Mar 31, 1982
• Grant date: Nov 22, 1983
• Expiry date: Mar 31, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J25/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A specially textured surface of pyrolytic graphite exhibits extremely low yields of secondary electrons and reduced numbers of reflected primary electrons after impingement of high energy primary electrons. Electrode plates of this material are used in multistage depressed collectors. An ion flux having an energy between 500 eV and 1000 eV and a current density between 1.0 mA/cm.sup.2 and 6.0 mA/cm.sup.2 produces surface roughening or texturing which is in the form of needles or spires. Such textured surfaces are especially useful as anode collector plates in high efficiency electron tube devices.