Product brief description:
Silicon carbide rings possess excellent properties of silicon carbide ceramics such as high hardness, high temperature resistance (able to work stably in high-temperature environments), wear resistance, and corrosion resistance. They are widely used in fields such as mechanical sealing and high-end bearings, and can ensure the sealing reliability and service life of equipment under complex working conditions.
Product Details Description:
Silicon carbide ceramics not only possess excellent room - temperature mechanical properties, such as high bending strength, excellent oxidation resistance, good corrosion resistance, high wear resistance, and low friction coefficient, but also their high - temperature mechanical properties (strength, creep resistance, etc.) are among the most outstanding among known ceramic materials. Silicon carbide materials prepared by hot pressing sintering, pressureless sintering, and hot isostatic pressing sintering can maintain stability at temperatures up to 1600°C, making them materials with very good high - temperature strength among ceramic materials. Their oxidation resistance is also very good among all non - oxide ceramics.
The initial application of silicon carbide was due to its high - hardness performance. It can be made into various grinding wheels, emery cloth, sandpaper, and various abrasives for grinding, thus being widely used in the mechanical processing industry. Later, it was discovered that it can also be used as a reducing agent in steelmaking and as a heating element, thereby promoting the rapid development of silicon carbide.
Silicon carbide ceramics have been widely used in industrial fields such as petroleum, chemical industry, microelectronics, automobile, aerospace, aviation, papermaking, laser, mining, and atomic energy. Silicon carbide has been widely used in high - temperature bearings, bulletproof plates, nozzles, high - temperature corrosion - resistant components, and electronic equipment parts in high - temperature and high - frequency ranges.
Silicon carbide rings, as a typical component of silicon carbide ceramics, fully inherit the excellent performance system of silicon carbide materials. They possess extremely high structural strength and hardness, which enables them to maintain morphological stability under complex mechanical loads and resist external impact and extrusion. Their wear resistance reaches the top level; when facing continuous friction conditions (such as contact friction in rotation and reciprocating motion), the wear rate is much lower than that of conventional metal or ceramic rings, and the service life is greatly prolonged. They have outstanding high-temperature performance and can work stably for a long time in a temperature environment of 1200°C or even higher. Moreover, they have excellent thermal shock resistance; even in scenarios with sharp temperature changes (such as the startup and shutdown process of high-temperature equipment), they are not easy to crack or break due to thermal stress. At the same time, their corrosion resistance is excellent, and they have strong resistance to acid, alkali, salt solutions, and various organic corrosive media. They can operate reliably for a long time in harsh corrosive environments. In addition, they also have good thermal conductivity and oxidation resistance, with high heat transfer efficiency, and are not easy to cause performance attenuation due to oxidation at high temperatures.
In terms of application fields, silicon carbide rings cover many key industrial scenarios with their multiple advantages. In the field of mechanical sealing, they are the core components of high-end mechanical seals and are widely used in the sealing of pumps in the petrochemical industry, the sealing of circulating pumps in nuclear power cooling systems, and the sealing of aerospace engines. For example, when transporting highly corrosive, high-temperature, and high-pressure chemical media (such as strong acid solutions and high-temperature melts), silicon carbide rings can be used as moving rings or stationary rings to achieve reliable sealing, prevent medium leakage, and ensure the safe and efficient operation of equipment. In the field of bearings and transmission, silicon carbide rings can be used as rolling elements or cage components of high-temperature and high-speed bearings, suitable for high-temperature roller bearings in the metallurgical industry, high-speed bearings in aero engines, etc. With their low friction coefficient and high wear resistance, they reduce the running resistance of bearings and improve transmission efficiency and service life. In the field of semiconductors and microelectronics, due to the semiconductor characteristics, high-temperature resistance, and radiation resistance advantages of silicon carbide, silicon carbide rings can be used in key structural parts of high-temperature semiconductor equipment, such as high-temperature carrier rings in the wafer manufacturing process. They can maintain structural stability in high-temperature process environments (such as epitaxial growth and ion implantation at high temperatures) and are not easy to pollute wafers, ensuring the accuracy and yield of chip manufacturing. In the field of new energy, such as the high-pressure sealing link of hydrogen energy equipment, silicon carbide rings can withstand the corrosion of high-pressure hydrogen and the scouring of high-speed flow, providing support for the sealing reliability of hydrogen fuel cell systems and hydrogen energy storage and transportation equipment. In addition, in scenarios such as wear-resistant parts of mining machinery and sealing rings of high-temperature drying rollers of papermaking machinery, silicon carbide rings have also become a key choice to replace traditional materials and improve equipment performance with their wear-resistant and high-temperature resistant characteristics.
From the perspective of product advantages, silicon carbide rings can first significantly improve equipment reliability and service life. Their excellent wear resistance, corrosion resistance, and high-temperature resistance reduce the number of equipment failures and shutdowns caused by relying on sealing and transmission, and lower maintenance costs. Secondly, their ability to adapt to extreme working conditions is extremely strong, filling the application gap of traditional metal rings (easy to corrode, insufficient high-temperature strength) and ordinary ceramic rings (poor thermal shock resistance, high brittleness) in high-temperature, strong corrosion, and high wear scenarios, and providing a material basis for the development of high-end equipment towards more demanding working conditions. Moreover, they help equipment achieve efficient operation; the low friction coefficient can reduce energy loss, and good thermal conductivity can assist equipment in thermal management (such as timely Export Friction heat in the sealing link to avoid local overheating), thereby improving the energy efficiency of the entire system. In addition, their technical empowerment role in high-end fields is prominent. Relying on the integration of the semiconductor properties and structural properties of silicon carbide, silicon carbide rings can meet the needs of structural support, sealing protection, and partial electrical properties in high-end fields such as semiconductors and aerospace, promoting the development of related equipment in the direction of miniaturization, high integration, and high reliability.
In terms of manufacturing process, silicon carbide rings usually adopt precision sintering and processing technology. First, processes such as hot pressing sintering, reaction sintering, or hot isostatic pressing sintering are used to densify silicon carbide powder into a blank. Then, through high-precision grinding, lapping, or even laser processing, the dimensional accuracy of the ring (such as roundness, parallelism, and surface roughness) reaches an extremely high standard to meet the strict tolerance requirements of precision sealing, high-speed transmission, and other scenarios. Some high-end silicon carbide rings will also undergo surface modification treatments (such as coating strengthening and ion implantation) to further optimize their wear resistance, corrosion resistance, or electrical properties and expand the application boundaries. With the iteration of industrial technology, the preparation process of silicon carbide rings is continuously upgraded. It can not only realize the manufacture of ring bodies with larger sizes and more complex structures but also achieve a balance between performance consistency and cost control, laying a foundation for their popularization and application in a wider range of fields.
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
