Gefügeeinstellung beim Mikrowellensintern von Al₂O₃

Titelangaben

Vodegel, Stephan ; Hannappel, C. ; Willert-Porada, Monika:
Gefügeeinstellung beim Mikrowellensintern von Al₂O₃.
In: Metall. Bd. 48 (Januar 1994) Heft 3 . - S. 206-210.
ISSN 0026-0746

Weitere URLs

Abstract

Microwave sintering (2,45 GH) of high purity alumina (>98%) yields different microstructures as compared to conventional sintering methods. However the occurence of such «microwave effects» as, e.g., significantly decreased sintering or reaction temperatures, is connected to certain experimental conditions. A systematic investigation of the late stage sintering using different sintering parameters and additives has been undertaken in order to identify the origin of microwave effects. The main effect is caused by aliovalent additives, which display some solubility in Al2O3. Grain boundary segregation of secondary phases discriminates this microwave effect