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Decomposition of Mullite ROBERT F. DAVIS,* iLHAN A. AKSAY, and JOSEPH A. PASK
 

Summary: Decomposition of Mullite
ROBERT F. DAVIS,* iLHAN A. AKSAY, and JOSEPH A. PASK
Inorganic Materials Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Engineering,
College of Engineering, University of California, Berkeley, California 94720
Free surfaces of 2: 1 mullite (2A120,.Si02)specimens decom-
posed with the evolution of SiO and 0, when they were heated
at high temperatures under low partial pressures of 02;this
reaction was analyzed thermodynamically. In addition,
bubbles were observed at internal interfaces between mullite
and fused-Si02 diffusion couples. These bubbles, when formed
at 1 atm ambient pressure between 1650" and 1800"C, resulted
from reaction of Si particles and residual SO,-rich glass in
the fused cast mullite.
I. Introduction
URING an investigation of diffusion kinetics in the A1,03-
D SiO, system,' bubbles were observed at the interfaces
in fused Si02-2:1 mullite (2A1,0a.Si0,) couples annealed in
static He or in air at high temperatures. Since care had been
taken to avoid entrapping He at couple interfaces and since
no such phenomenon was observed with sapphire-SiOl couples,

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science