large diameter si3n4 tube

Silicon Nitride Tubes are ceramic thermocouple protection tubes used for melting aluminum. Silicon nitride tubes are generally immediately available in most volumes, including bulk quantities,can produce materials to custom specifications by request, in addition to custom compositions for commercial and research applications and new proprietary technologies.

Silicon nitride is a man made compound synthesized through several different chemical reaction methods. The material is dark gray to black in color and can be polished to a very smooth reflective surface, giving parts with a striking appearance.
High performance silicon nitride materials were developed for automotive engine wear parts, such as valves and cam followers and proven effective. The very high quality bodies developed for these demanding high reliability applications are available today and can be used in many severe mechanical, thermal and wear applications.