Description of Silicon Carbide Beam
Silicon carbide beams can also be called reaction sintered silicon carbide square beams, shaped beams, solid beams, hollow beams, columns, load-bearing beams, hole beams and so on. The product has high temperature bearing capacity, oxidation resistance, and will not bend or deform in long-term use. Long service life, is an ideal kiln furniture for sanitary porcelain and electrical porcelain and other industries; the product has excellent high-temperature bending strength, thermal shock resistance, oxidation resistance, can greatly save energy consumption without increasing the weight of the kiln machine.
Physical and chemical indicators of silicon carbide beams
| Item | RSIC | NSIC | RBSIC |
|---|---|---|---|
| Table of Contents | SiC≥99% | SiC≤75% Si3N4≥25% | SiC≥90% Si≤10% |
| Bulk density，g.cm-³ | 2.65~ 2.75 | 2.75 ~2.85 | >3.02 |
| Surface porosity，% | < 15 | < 11 | < 0.1 |
| Modulus of elasticity of the joint at 20°C，Mpa | 90 ~ 100 | 160 ~ 170 | 250 |
| Modulus of elasticity of the weld at 1200°C，Mpa | 100~ 110 | 170 ~ 180 | 260 |
| Hardness at 20°C，Kg/mm² | 1800~ 2000 | 2500 | 2400 |
| Fracture toughness at 20°C，Mpa*M½ | 1.8~ 2.0 | 4 | 3.3 |
| Thermal conductivity at 1200°C，W/m .k | 35~36 | 20 | 45 |
| Thermal expansion at 20 ~ 1200°C，1x10-6*/°C | 4.6 | 4.7 | 4.5 |
| Max. operating temperature | 1650°C | 1500°C | 1 350°C |
Note: This product can be customized according to customer's requirements.
Features of silicon carbide beam
- High strength - the density of silicon carbide is low, the theoretical density is only 3.22 g / cm3, high strength.
- High hardness - in terms of hardness it surpasses corundum and is second only to diamond among abrasive materials.
- Good thermal shock resistance - Silicon carbide has good thermal shock resistance due to its high thermal conductivity and low coefficient of linear expansion.
- Strong resistance to acids and alkalis - silicon carbide has strong resistance to acid corrosion and slightly weak resistance to alkali corrosion. The main reason is the formation of a protective SiO2 film.
- High thermal conductivity - the thermal conductivity of silicon carbide products is very high, typically 40-120 W/m.K.
- Small coefficient of thermal expansion - the expansion coefficient of silicon carbide is small, 1000 ℃, the coefficient of linear expansion is 4.7 × 10-6m/K.
- Strong oxidation resistance - When the silicon carbide material is heated to 1300 ℃, with the thickening of the protective layer, preventing the internal silicon carbide from continuing to be oxidized, which makes the silicon carbide have better oxidation resistance.
Application of silicon carbide beam
Silicon carbide beams are used as load-bearing structures in tunnel kilns, shuttle kilns, double-layer roller kilns and other industrial kilns.
