Characteristics of silicon carbide kiln furniture
1. Excellent high-temperature mechanical properties: Silicon carbide kiln furniture can maintain high mechanical strength at high temperatures. Before 1500℃, its mechanical strength increases slightly with the increase of temperature.
2. Strong refractory performance: Silicon carbide has extremely high refractoriness, has no melting point in the atmosphere, begins to sublimate above 2300℃, and decomposes into silicon vapor and graphite above 2600℃.
3. Good thermal shock resistance: Due to the high-temperature stability, high mechanical strength and thermal conductivity, and small thermal expansion coefficient of silicon carbide materials, it has excellent high-temperature strength and thermal shock resistance. 4. High thermal conductivity: The thermal conductivity of silicon carbide is very high, 65w/m·k at 500℃ and 42w/m·k at 875℃, which is more than 10 times that of general high-aluminum refractory materials.
5. Small thermal expansion coefficient: The thermal expansion coefficient of silicon carbide is very small, and the expansion coefficient from room temperature to 1400℃ is α=4.8×10^-6℃^-1.
6. High chemical stability: Silicon carbide is very stable in both reducing and neutral atmospheres, and no obvious decomposition reaction occurs until 2200℃.
7. High strength and good wear resistance: Silicon carbide plates have high strength, high hardness, wear resistance, corrosion resistance, good oxidation resistance, and good thermal shock resistance.
8. Long service life: Since silicon carbide kiln furniture has excellent physical properties, its service life in the kiln is very long. For example, the service life of the cold air duct is 5 to 10 times that of refractory materials such as stainless steel pipes or alumina.
9. Significant energy-saving effect: Due to the high thermal conductivity of silicon carbide, energy consumption can be saved without increasing the weight of the kiln car.
These characteristics make silicon carbide kiln furniture widely used in the ceramic industry, improve the production capacity of the kiln, reduce energy consumption, and effectively reduce the deformation, slag and other firing defects of the products.
Product Parameters
|
Index
|
NSIC
(silicon nitride combined with silicon carbide)
|
SISIC
(reaction sintered silicon carbide)
|
RSIC
(recrystallized silicon carbide)
|
|
Bulk density(g/cm³)
|
2.75-2.82
|
>3.02
|
2.60-2.74
|
|
Porosity (%)
|
10-12
|
<0.10
|
15
|
|
Compression strength(MPa)
|
600-700
|
/
|
≥600
|
|
Bending strength(MPa)
|
250(20℃)
|
250(20℃)
|
90-100(20℃)
|
|
160-180(1100℃)
|
280(1200℃)
|
100-120(1100℃)
|
|
Young's modulus(GPa)
|
220-260
|
/
|
280(20℃)
|
|
Thermal conductivity(W/MK)
|
15(1200℃)
|
45(1200C)
|
26(1200℃)
|
|
Thermal expansion(20-1000℃)
10-k¹
|
5.0
|
4.5
|
4.8
|
|
Max.working temperature(℃)
|
1500
|
1380
|
1650
|
|
PH Resistanced
|
/
|
EXCELLENT
|
1-14
|
|
Moh's scale of thermal expansione
|
/
|
13
|
0
|
|
Si₃N:(%)
|
20-40
|
/
|
98.5
|
|
a-SIC(%)
|
60-80
|
/
|
/
|
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