Paper Title:
Recent Advances in Microwave and Millimeter-Wave Processing of Materials
  Abstract

We are using 2.45 GHz (S-Band) microwave systems and an 83-GHz, gytrotron-based, millimeter-wave beam system in material processing and other areas. We use one 2.45 GHz system in preparation of nanophase metals, metal mixtures and metal oxides, via the patented continuous microwave polyol process, with potential for large scale, low cost production. Of interest are precious metals, mixtures of magnetic and nonmagnetic metals, and mixed metal oxides for ceramic precursors. The other S-Band systems are used to develop repair techniques for ceramic matrix composites where the repairs are heated to 200-1000°C. A portable, battery-powered system is being developed for field repairs, and promises to be much more practical than alternative approaches (e.g., heating blankets). The 83-GHz system is being used in rapid sintering of polycrystalline ceramic materials intended for use in high power solid state lasers, where the requirement if for sintering to transparency with high optical quality and good lasing efficiency. Transparent Yb-doped yttria has been produced with hybrid conventional/millimeter-wave sintering of nanophase powders, as well as theoretically dense YAG. Another application for the millimeterwave beam system is in consolidation and bonding of hard coatings to light alloys, such as SiC on titanium, where the beam system allows heating of the coating to very high temperatures without overheating the metallic substrate. Finally, the millimeter-wave system is being used in the development of millimeter-wave plasma-assisted diamond deposition, where the quasi-optical system has significant advantages over conventional microwave plasma-assisted diamond deposition. Results for these various areas will be presented and discussed.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
3249-3254
DOI
10.4028/www.scientific.net/MSF.539-543.3249
Citation
D. Lewis III, A. M. Imam, A. W. Fliflet, R. W. Bruce, L.K. Kurihara , A.K. Kinkead, M. Lombardi, S. H. Gold, "Recent Advances in Microwave and Millimeter-Wave Processing of Materials", Materials Science Forum, Vols. 539-543, pp. 3249-3254, 2007
Online since
March 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Tsutomu Tsunooka, Tomonori Sugiyama, Hitoshi Ohsato, Kenichi Kakimoto, Minato Andou, Yutaka Higashida, Hirotsugu Sugiura
199
Authors: Igor Fesenko, Mykola Novikov, Pavlo Kisly
Abstract:Pressureless sintering AlN ceramics of high density, high level of mechanical, electrical and thermal properties, of predetermined level of...
639
Authors: Akira Kishimoto, Tetsuya Morimoto, Hidetaka Hayashi
Abstract:By using 24 GHz millimeter-wave irradiation, full densification of AlN added with Y2O3 was attained at 1700 °C, which is comparable to...
533
Authors: Jian Xun Yao, Liu Ying Wang, Gu Liu, Shao Chun Hua
Abstract:Both the complex permittivity and permeability of nanometer SiC and nanometer SiC/CNTs composite were investigated by Hewlett-Packard 8510B...
349
Authors: Guo Guang Yao, Hong Ma, Xiu Lao Tian
Chapter 5: Dielectric Materials
Abstract:The effects of Li0.8Ca0.2F1.2 doped on the sinterability, phase constitutions and microwave dielectric properties of...
266