Si3N4 bonded SiC bricks for Blast furnace
Si3N4 bonded SiC blast furnace lining bricks Si3N4 bonded SiC inset bricks for cooling stave Si3N4 bonded SiC combinded bricks for blast furnace tuyere Si3N4 bonded SiC sleeve for last furnace tuyere
Si3N4 bonded SiC blast furnace lining bricks
Si3N4 Bonded SiC Bricks are made from high quality silicon carbide and industrial silicon powder as raw materials sintered at high temperature by nitridation reaction. Characterized with good thermal shock resistance, good alkali corrosion resistance, good slag resistance, high strength and high thermal conductivity, the bricks are mainly used in severe parts of iron-making blast furnace, such as the lower part of stack, belly, bosh and tuyere. The bricks have been successfully used in about 10 large scale steels such as Baosteel and Wuhan Iron and Steel Corporation in China, and also have been exported to some other countries and regions such as Russia, Ukraine, Kazakhstan, American etc.
Si3N4 bonded SiC blast furnace lining bricks
Si3N4 bonded SiC inset bricks for cooling stave
Si3N4 bonded SiC combinded bricks for blast furnace tuyere
Si3N4 bonded SiC sleeve for last furnace tuyere
Item | Si3N4 bonded SiC bricks | ||
Inset brick, lining brick, tuyere assembled brick | Tuyere sleeve | ||
Chemical composition，% | SiC , % ≧ | 72 | 70 |
Si3N4 , % ≧ | 20 | 20 | |
Fe2O3 , % ≦ | 0.7 | 0.7 | |
Bulk density，g/cm3 ≧ | 2.67 | 2.55 | |
Apparent porosity，％ ≦ | 16 | 20 | |
Cold crushing strength，MPa，≧ | 160 | 120 | |
Modulus of rupture≧ | normal temperature | 40 | 30 |
1400℃×0.5h | 45 | 35 | |
Refractoriness under load， oC， | 1700 | 1700 | |
（0.2MPa, 0.6%）＞ | |||
Thermal shock resistance ≧ （1100oC water quenching） | 30 | 30 | |
10-6．K-1 Thermal expansion coefficient | 4.5 (20~1000℃) | - | |
Thermal conductivity W/(m．K) | 300℃ | 35 | - |
700℃ | 24 | - | |
1000℃ | 20 | - | |
1300℃ | 15 | - | |
Application | Used for lower part of stack, bosh, belly lining of blast furnace and boiler linings of fluidization furnace, etc. | Used for tuyere sleeve of blast furnace. | |