Long service life, strength at temperature, wear resistance and good thermal conductivity make silicon carbide ceramic muffles an ideal choice for these furnaces.
Crystolon®, Cryston® and Refrax® silicon carbide muffle sections are routinely used in atmosphere belt furnaces that sinter traditional ferrous powder metal parts. As a materials innovator, Saint-Gobain silicon carbide muffle sections have replaced alloy muffles due to superior thermo-mechanical stability. These sections are produced to accommodate belts up to 36 inches (915mm) wide.
Silicon carbide ceramic muffles can reduce the costs associated with standard alloy muffle maintenance and replacement.
Carbofrax®, Crystolon®, Cryston® and Refrax® silicon carbide hearth plates are traditionally used to provide 100% support for both alloy and ceramic muffle sections. Silicon carbide plates can be produced in a variety of standard sizes.
Crystar® 2000, Silit® SK and Hexoloy® silicon carbide beams can also be used to provide structural support for ceramic and alloy muffles and are up to 10 times stronger than traditional silicon carbide plates. These materials provide a lightweight and strong alternative to traditional silicon carbide plates. Silicon carbide beams are produced in sections as small as small as 0.5 x 0.5” (12.7 x 12.7mm) and up to 120" long.
Saint-Gobain can engineer muffle sections, support beams and hearth plates in a variety of silicon carbide material combinations to suit your application.
Many powder metal parts are placed directly on the furnace mesh belt, while some parts must meet special flatness tolerances or require a reaction barrier, which calls for the use of kiln furniture such as ceramic setters and fixtures.
Alundum® and Mulnorite® setters can be used as alternatives to cordierite and graphite when temperature and setter reaction make these materials unreliable. Zirconia and alumina coatings also are available to prevent further unwanted chemical reactions.
Saint-Gobain engineers will help you optimize kiln furniture components for your specific application, including: