Title :
High thermal conductivity aluminum nitride ceramics for high power microwave tubes
Author :
Savrun, Ender ; Nguyen, Victor ; Abe, D.K.
Author_Institution :
Sienna Technol., Inc., Woodinville, WA, USA
Abstract :
Sienna Technologies, Inc., has successfully developed a family of high thermal conductivity aluminum nitride (AlN) based dielectrics as an alternative to BeO and BeO-SiC composites in microwave tubes. A pressureless sintering process was developed to fabricate high thermal conductivity (185-200 W/m-K), low loss (tan δ = 0.0007 at 9 GHz), pure AlN for collector rods and rf windows. The collector rods were successfully tested in two different tube designs. The thermal performance of our ST-180 grade AlN collector rods is illustrated.
Keywords :
aluminium compounds; ceramics; dielectric losses; dielectric materials; microwave materials; microwave tubes; sintering; thermal conductivity; 9 GHz; AlN; RF window; aluminum nitride ceramic; collector rod; dielectric loss; high power microwave tube; pressureless sintering process; thermal conductivity; Aluminum nitride; Bonding; Ceramics; Composite materials; Conducting materials; Dielectric losses; Dielectric materials; Microwave technology; Testing; Thermal conductivity;
Conference_Titel :
Vacuum Electronics Conference, 2002. IVEC 2002. Third IEEE International
Print_ISBN :
0-7803-7256-5
DOI :
10.1109/IVELEC.2002.999246
