Brief product description
Silicon carbide shaft sleeves are widely used in chemical pumps, magnetic drive pumps, and high-temperature industrial equipment due to their high hardness, high temperature resistance (1500 ℃), and strong acid corrosion resistance
Product details description
SiC ceramics hardness can reach Mohs 9.5 (second only to diamond), the upper limit of working temperature is 1500 ℃, and it remains stable in acid-base environments with pH values of 1-14.
Charateristics of SiC ceramics:
-
1. Exceptional Hardness & Wear Resistance: It is one of the hardest materials available, second only to diamonds and boron carbide. This makes it ideal for applications involving abrasion.
-
2. High Thermal Conductivity: It can dissipate heat very effectively, unlike most ceramics which are thermal insulators.
-
3. Excellent Thermal Shock Resistance: It can withstand rapid heating and cooling without cracking.
- 4. High Strength and Stiffness: It maintains its strength at very high temperatures.
-
5. Chemical Inertness: It is highly resistant to corrosion from acids, alkalis, and molten metals.
-
6. Semiconductor Properties: Depending on its purity and doping, it can be an electrical insulator or a semiconductor.
Applications of Silicon Carbide Ceramic Sleeves
Because of this unique property set, SiC sleeves are used in demanding applications across many industries:
-
1. Mechanical Seals and Bearings:
- This is a very common use. The sleeve acts as a stationary part in a mechanical seal system, often running against a rotating face (like carbon). Its hardness and wear resistance make it last much longer
- than metals or other ceramics in abrasive or corrosive fluids.
- Industries: Chemical processing, pumps, oil and gas, wastewater treatment.
- 2. Thermocouple Protection Sheaths:
In high temperature furnaces (e.g., for metal or ceramic processing), a SiC sleeve is used to protect the delicate metal thermocouple that measures temperature. It can withstand the intense heat and corrosive atmospheres.
Industries: Heat treating, glass manufacturing, sintering.
- 3. Kiln Furniture (Supports):
In ceramic kilns, SiC sleeves and posts are used to support ware (products being fired) during the firing process. Their high strength and thermal shock resistance prevent sagging or breaking at extreme
temperatures.
Industries: Technical ceramics, sanitaryware, tableware.
- 4. Wear Liners and Bushings:
In any machinery where components are subject to severe abrasion, a SiC sleeve can be used as a liner or bushing to protect more expensive or critical parts.
Industries: Mining, mineral processing, powder handling.
- 5. Semiconductor Processing:
High-purity SiC is used for components in semiconductor furnaces, such as susceptors (which hold the silicon wafers) and process tube liners, because it can withstand high temperatures and is contaminant- free.
Product Parameter Table
| Item |
UNIT |
Pressureless Sintered Silicon Carbide (SSIC) |
Reaction Bonded Silicon Carbide (RBSiC/SiSiC) |
Recrystallized Silicon Carbide (RSIC) |
| Max temperature of Application |
℃ |
1600 |
1380 |
1650 |
| Density |
g/cm³ |
> 3.1 |
> 3.02 |
> 2.6 |
| Open Porosity |
% |
< 0.1 |
< 0.1 |
15% |
| Bending Strength |
Mpa |
> 400 |
250(20℃) |
90-100(20℃) |
|
Mpa |
|
280(1200℃) |
100-120 (1100℃) |
| Modulus of Elasticity |
Gpa |
420 |
330(20℃) |
240 |
|
Gpa |
|
300 (1200℃) |
|
| Thermal Conductivity |
W/m.k |
74 |
45(1200℃) |
24 |
| Coefficient of Thermal Expansion |
K⁻¹×10⁻⁶ |
4.1 |
4.5 |
4.8 |
| Vickers Hardness HV |
Gpa |
22 |
20 |
|
| Acid Alkaline-proof |
|
excellent |
excellent |
excellent |
EN
