Open AccessDevelopment of low-expansion ceramics with strength retention to elevated temperatures. Final report
Author(s) -
Deidre A. Hirschfeld,
J.J. Brown
Publication year - 1994
Language(s) - English
Resource type - Reports
DOI - 10.2172/28336
Subject(s) - cristobalite , mullite , ceramic , zircon , materials science , thermal shock , thermal expansion , thermal stability , commercialization , chemical engineering , composite material , engineering , geology , geochemistry , business , quartz , marketing
The development of advanced engines has resulted in the need for new ceramic compositions which exhibit thermo-mechanical properties suitable for the engine environment, e.g., low thermal expansion, stability to 1,200 C, and thermal shock resistance. To meet these goals, a two phase research program was instituted. In the first phase, new oxide ceramics were identified in the AlPO{sub 4}-{beta}-eucryptite, {beta}-cristobalite, mullite and zircon systems. This research focused on screening and property characterization of ceramics in the four systems. The most promising compositions in the AlPO{sub 4}-{beta}-eucryptite and zircon systems were then further evaluated and developed in the second phase with the goal of being ready for prototype testing in actual engines. Of the compositions, calcium magnesium zirconium phosphate (zircon system) exhibits the most desirable properties and is presently being developed for commercialization