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Sintered Silicon Carbide (ssic) |
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| The silicon carbide has the advantages of excellent corrosion resistance, high coefficient of heat conductivity, self-lubricity, small expansion. It can be widely used in the petroleum, chemical, machinery-building, cosmonautics and motors industries. The frictional factor of combination of silicon carbide and carbon graphite is the least, so it widely applied to high characteristics for the mechanical seals.
Technical data of ssic
| property |
units |
SSIC |
SSIC+C |
| Density |
g/cm³ |
3.1~3.15 |
2.90~2.95 |
| Hardess（knoop） |
kg/mm2 |
2800 |
2200 |
| Porosity |
% |
＜0.2 |
N/A |
| Flexural Strength 4 pt@RT |
Mpa x10³lb/in² |
450 |
200 |
| Compressive Strength@RT |
Mpa x10³lb/in² |
3900 |
2200 |
| Modulus of Elasticity@RT |
Gpa x106lb/in² |
410 |
370 |
| Free silicone content |
% |
0.1 |
0.1 |
| Purity（%） silicone content |
% |
≥99 |
≥90 |
| Coefficient of heat transfer |
Cal/cm.s.℃ |
0.3 |
0.3 |
Coefficient of Thermal Expansion RT to 700℃
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x10ˉ6mm/mmK x10ˉ6 in/in°F |
4.3x10-6 |
4.3x10-6 |
| Maximum Service Temp.Air |
°C |
1600 |
1100 |
| Poisson Ratio |
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0.14 |
0.14 |
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The Testing Result for Sealing Material in Corrosive Fluid Condition
| testing conditon |
corrosive weightlessness（mg/c㎡yr） |
| density of additives（Wt%） |
Temperature(℃) |
SSIC（NO free silicone） |
SIC（12% silicone） |
WC（6% cobalt） |
AL2O3（99%） |
| 98% H2SO4 |
100 |
1.8 |
55 |
>1000 |
65.0 |
| 50% NaOH |
100 |
2.5 |
>1000 |
5.0 |
75.0 |
| 53% HF |
25 |
<0.2 |
7.9 |
8.0 |
20.0 |
| 85% H3PO4 |
100 |
<0.2 |
8.8 |
55 |
>1000 |
| 70% HNO3 |
100 |
<0.2 |
0.5 |
>1000 |
7.0 |
| 45% KOH |
100 |
<0.2 |
>1000 |
3.0 |
60.0 |
| 25% HCI |
70 |
<0.2 |
0.9 |
85.0 |
72.0 |
| 10% HF+57% HNO3 |
25 |
<0.2 |
>1000 |
>1000 |
16.0 | | |
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Conform to national standards JB/T 6374-95
and international standards DIN-24960
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