Ceramic Tube Material and Processing Development: Development of Large Reaction Bonded Silicon Carbide Components for Gas-Fired Furnaces

摘要

Ceramic component manufacturing technology for reaction bonded silicon carbide (SCRB-210) has been developed for production of large thin-walled components up to 8 inch diameter and 8 feet in length. Available property data, component performance information, and cost estimates are presented. Accomplishments and results include: Optimization of body preparation, tube casting and drying procedures, and modifications to Coors siliconizing process has resulted in a consistent, high yield production process. Property values obtained in full size components include densities of 3.08 g/cc, flexural strength of 58,000 psi at 1200 C, fracture toughness (K sub Ic) of 6.3 at 1200 C and thermal conductivity of 257 BTU in/hr ft(sup 2)/F at 1000 C. Initial component tests indicate SCRB-210 to be viable for numerous high temperature radiant tube and heat exchanger applications.