Study of the Corrosion of Ceramic Materials in a Simulated Advanced Glass Melter Flue-Gas Environment. Topical Report June 1987-May 1988

摘要

The report summarizes the mechanical response of two baseline silicon carbide materials and several other ceramic materials to a simulated advanced glass melter (AGM) flue gas environment. The simulated environment consisted of sodium silicate injected into a heated gas stream. The two baseline silicon carbide materials consisted of a reaction bonded siliconized silicon carbide with a bimodal grain size distribution (2 to 5 micrometers and 25 to 75 micrometers) and a sintered alpha silicon carbide with a uniform average grain size of 2 to 5 micrometers. The other ceramic materials included several grades of alumina, silicon carbide/alumina composites, and alumina/alumina composites. In general, the strength and load-bearing capacity of the silicon carbide materials was degraded when subjected to temperatures above 960 C (1760 F). The alumina materials were little affected by the environment for times up to 240 hours and temperatures up to 1000 C (1832 F). The composite materials produced an alumina layer that appeared to protect the surface.