ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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 systemin preparation of nanophase metals, metal mixtures and metal oxides, via the patented continuousmicrowave polyol process, with potential for large scale, low cost production. Of interest areprecious metals, mixtures of magnetic and nonmagnetic metals, and mixed metal oxides for ceramicprecursors. The other S-Band systems are used to develop repair techniques for ceramic matrixcomposites where the repairs are heated to 200-1000°C. A portable, battery-powered system isbeing developed for field repairs, and promises to be much more practical than alternativeapproaches (e.g., heating blankets). The 83-GHz system is being used in rapid sintering ofpolycrystalline ceramic materials intended for use in high power solid state lasers, where therequirement 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 sinteringof nanophase powders, as well as theoretically dense YAG. Another application for the millimeterwavebeam system is in consolidation and bonding of hard coatings to light alloys, such as SiC ontitanium, where the beam system allows heating of the coating to very high temperatures withoutoverheating the metallic substrate. Finally, the millimeter-wave system is being used in thedevelopment of millimeter-wave plasma-assisted diamond deposition, where the quasi-opticalsystem has significant advantages over conventional microwave plasma-assisted diamonddeposition. Results for these various areas will be presented and discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3249.pdf
Permalink