Solid-state reactive sintering of polycrystalline Nd:YAG ceramic laser host materials using an 83 GHZ millimeter wave system

Ralph W. Bruce, Chad A. Stephenson, Arne W. Fliflet, Steven B. Gold, M. Ashraf Imam

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We are investigating the solid-state reactive sintering of polycrystalline Nd:YAG ceramic laser host materials using a high power millimeter-wave beam as the heat source. The starting powder is a mixture of commercially available alumina, yttria, and neodymia powders. The laser-quality results obtained using the solid-state reactive sintering approach and the same materials in a conventional vacuum furnace1 provide a benchmark for our experiments, which are being carried out using the Naval Research Laboratory (NRL) 83 GHz Gyrotron Beam Material Processing Facility. One objective of our work is to determine the effect of millimeter-wave heating on processing variables such as temperature and hold time and on the microstructural properties impacting the laser host application. Another objective is to optimize the heating uniformity and efficiency of the process for future use in a manufacturing process. Initial experiments with 1-hour hold times have produced translucent samples whose microstructure is currently being evaluated. Longer processing times (up to 16 hours) were needed to achieve full transparency in a conventional furnace. Hold times longer than 1 hour were also investigated and will be reported.

Original languageEnglish (US)
Title of host publicationAdvanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials III - A Collection of Papers Presented at the 33rd Int. Conference on Advanced Ceramics and Composites
Pages1-9
Number of pages9
Edition8
StatePublished - May 13 2010
Externally publishedYes
EventAdvanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials III - 33rd International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: Jan 18 2009Jan 23 2009

Publication series

NameCeramic Engineering and Science Proceedings
Number8
Volume30
ISSN (Print)0196-6219

Conference

ConferenceAdvanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials III - 33rd International Conference on Advanced Ceramics and Composites
CountryUnited States
CityDaytona Beach, FL
Period1/18/091/23/09

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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