Refractory Silicon Carbide SISIC Beam for Industrial Furnaces kiln
furniture
1. Sintering Theory
Silicon carbide beam is mainly used in the production of aluminum,
copper and zinc , as the lining material of the molten pool and
electrolytic bath (reduction bath).The side lining of the reduction
bath is eroding by aluminum and cryolite (used as additive), but
Si3N4 bonded SiC material could not be eroded by aluminum, and do
not have chemical reaction with cryolite.So this kind of material
is ideal for the lining bricks of the electrolytic bath.In
particular this kind of bricks have the excellent properties of
high strength, abrasive resistance and nonconductive, so the
copolymer (Al2O3 and Cryolite). The copolymer likes protective film
to protect the working lining and improve the service life of
electrolytic bath of silicon carbide pipe.
Reaction bonded SiC beam is made from α_SiC powder, graphite
powder, mixing additives and organic adhesive agent.The mixture
body is extruded and then filled into crucible with silicon powder.
Sinter in a vacuum heating furnace at 1600 ~1800° C, the melt
silicon powder reacts to the silicon in the body, finally from
β-Sic due to the heat of reaction.
Reaction-sintered, silicon-infiltrated silicon carbide (SiSiC)
components are produced by slip-casting or extruding a mixture of
silicon carbide, carbonaceous material and other ingredients into
the desired shape. The resulting green body is then fired in the
presence of a high concentration of silicon metal. As the silicon
diffuses through the body, it reacts with the carbonaceous material
to form additional silicon carbide, sintering the silicon carbide
structure and increasing the density. The remaining open porosity
is then filled with the excess silicon. SiSiC has a MOR
approximately 40% higher than NSiC and twice that of ReSiC. Its
high strength and oxidation resistance make SiSiC the material of
choice for most applications where the maximum temperature is below
its 1350°C use limit.
2. Property
◊ Superior wear resistance, impact resistance and corrosion
resistance
◊ Excellent flatness and temperature resistance up to 1380℃
◊ Excellent oxidation resistance
◊ Good dimensional control of complex shapes
◊ Easy installation
◊ Longer service life ( about 5 times more than that of alumina
ceramic and 6 times more than that of polyurethane)
3. Application
SiSic beams are used in various industrial furnaces, the
desulphurization equipment, the large boiers and other machinery,
and the ceramics, the machinery, the metallurgy, the electronic,
the chemicals, the petroleum, the iron and steel industry and other
fields.
The main products of reaction bonded silicon carbide ceramics are:
cross beams, rollers, coling air pipe,burner nozzles,thermocouple
protecting tubes,temperature measuring parts, radiant tubes,
desulfurization nozzles, crucible,batts, wear resistant lining
materials,plates, seals, rings and special shaped structural parts.
4. Techinical Parameter
| Item | Unit | Data |
| temperature of application | ℃ | ≤1380 |
| density | g/cm³ | ≥3.02 |
| open porosity | % | <0.1 |
| bending strength | Mpa | 250(20℃) |
| Mpa | 280(1200℃) |
| modulus of elasticity | Gpa | 330(20℃) |
| Gpa | 300(1200℃) |
| thermal conductivity | W/m.k | 45(1200℃) |
| coefficient of thermal expansion | K-1×10-6 | 4.5 |
| rigidity | | 13 |
We cooperate with many professional and powerful logistic
companies, so we can provide customers with most favorable price
and best logistic service.
Storage and Transportation:
Moisture proof, shock proof, collision proof. The storage time is 6
months, best performance within 6 months, and will be effected a
little within another 6 months.
