North Carolina State University since 1996
Adjunct Research Professor
US Army Research Office 1982 - 2000
Basic Research Manager
US DOE 1976 - 1981
Program Manager Geothermal Materials and Chemistry
Cambridge University Dept of Mineralogy & Petrology 1974 - Mar 1975
Post Doc
Institute for Crystallography, TH Aachen - Aachen, Germany 1972 - 1974
Senior Fulbright Research Fellow
Education:
New York University, The Ohio State University
B.Met.E., MS Phys Met. PhD Industrial Mineralogy, Materials Engineering, Industrial Mineralogy
Robert R. Reeber - Chapel Hill NC Wei-Kan Chu - Chapel Hill NC Salah M. Bedair - Raleigh NC
International Classification:
C03B 1900 C23C 1904
US Classification:
65 181
Abstract:
A method for fabricating a lens in which the lens composition is controlled by dynamic shaping and shadowing. A lens material is vaporized and directed to a substrate through an orifice which is rotating relative to the substrate about the lens axis and which has a non-uniform radial distribution. The lens material is condensed on the substrate to form a lens having a radially non-uniform but axially symmetrical distribution. Thereafter, the original orifice may be replaced by a complimentary orifice and another lens material vaporized and directed to the substrate through the replacement orifice which is also rotating relative to the substrate about the lens axis and which also has a non-uniform radial distribution. This second lens material condenses on the first condensed lens material to form a compound lens.
Surface Modification Of Boron Carbide To Form Pockets Of Solid Lubricant
Robert R. Reeber - Chapel Hill NC Wei K. Chu - Houston TX Ning Yu - Houston TX
Assignee:
The United States of America as represented by the Secretary of the Army - Washington DC
International Classification:
B05D 306 C23C 1400
US Classification:
427 38
Abstract:
A method of forming solid lubricant pockets in boron based and boron containing ceramic materials (i. e. boron carbide) by nitrogen ion implantation and laser annealing. By employing the present method said solid lubricant pockets may be formed in approximately the first 750 Angstroms of the surface and near surface regions of, for example, a polycrystalline boron carbide sample. Moreover, the present invention enables one to direct the formation of solid lubricants to specific areas on the boron based or boron containing ceramics to meet a specific need. The product of the present invention is a ceramic having a reduced coefficient of friction, greater durability, and reduced chipping and fracture.
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