... or Si3N4 thermocouple tube 2.High quality 3.Best price Thermowells and Pockets Silicon Carbide TubeSi3N4 bonded SiC ceramic refractory ... material, is mixed with high pure SIC fine powder and Silicon powder, after slip casting course, reaction sintered under ... ,thermal shock,which is better than plain refractory material and recrystallized SiC.It also has antioxidation,high corrosion resistant, ...