The antioxidant capacity of silicon carbide ceramics at high temperatures

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In high-temperature industrial environments, the oxidation resistance of materials directly determines the service life and operational stability of equipment. Silicon carbide ceramics exhibit excellent durability in extreme thermal environments due to their unique high-temperature oxidation resistance mechanism.
Faced with the challenges brought by complex working conditions such as high temperature oxidation, thermal shock, and chemical corrosion, our silicon carbide ceramic products can provide customers with stable and reliable solutions. Whether it’s high-temperature furnaces, combustion systems, or semiconductor manufacturing equipment, our products can effectively extend component life, reduce downtime maintenance frequency, and improve overall production efficiency. At the same time, we support customized services for multiple specifications and sizes to meet the precise needs of different application scenarios.

High temperature antioxidant mechanism and performance
Silicon carbide ceramics exhibit excellent oxidation resistance at high temperatures, with the core being the dense silicon dioxide (SiO ₂) protective layer formed on the surface. When the temperature rises above 800 ℃, silicon carbide reacts with oxygen to form a continuous and dense SiO ₂ glass film, which can effectively block further inward diffusion of oxygen and suppress the continuous oxidation of the substrate material.
At 1300 ℃, the oxidation rate of silicon carbide ceramics significantly decreases, and the increase in surface oxide layer thickness tends to be gentle, exhibiting good self-protection properties. Experimental data shows that after continuous exposure to 1400 ℃ air for 100 hours, the thickness of the surface oxide layer of the material is controlled at the micrometer level, and the internal structure does not show significant deterioration. The bending strength still remains above 500MPa.
In addition, by adding sintering aids or adopting gradient structure design, its high-temperature stability can be further improved. For example, in a gradient structure enriched with SiC phase on the surface and carbon fiber toughening introduced internally, the residual strength retention rate of the material under high-temperature cycling conditions is increased by 25%, significantly enhancing the synergistic performance of thermal shock resistance and oxidation resistance.

Application
Our silicon carbide ceramics are widely used in industrial scenarios with high temperature, high wear, and strong corrosion. Typical applications include:
-High temperature furnace components, such as furnace lining, heating element protection tube, temperature measuring sleeve, etc., can operate stably for a long time below 1600 ℃;
-Semiconductor manufacturing equipment: used for wafer carriers, diffusion furnace boats, etc., with high purity, low pollution, and plasma corrosion resistance characteristics;
-Aerospace and military industry: applied to key components such as rocket nozzles and missile control surfaces, capable of withstanding extreme thermal shock;
-Chemical and energy equipment: such as corrosion-resistant pump seals, catalyst carriers, heat exchanger components, resistant to corrosion from acidic and alkaline media.

The core advantages include:
-High temperature resistance: Long term use temperature can reach 1600-1700 ℃, short-term temperature resistance can reach 1800 ℃;
-Excellent antioxidant properties: The surface self generates a SiO ₂ protective layer, which inhibits further oxidation;
-High thermal conductivity: The thermal conductivity coefficient reaches 100-220W/m · K, and the heat dissipation performance is better than most ceramics;
-High hardness and wear resistance: The Mohs hardness is above 9.5, and the wear resistance is more than 10 times that of ordinary ceramics;
-Strong chemical stability: resistant to acid, alkali, salt, and molten metal corrosion, suitable for complex chemical environments.
We provide comprehensive customization services to support customers in customizing silicon carbide ceramic components with different shapes, sizes, porosity, and composite structures according to specific working conditions, ensuring perfect matching with equipment.

Addressing key challenges in applications
In practical applications, customers often face problems such as shortened component life due to high-temperature oxidation, cracking caused by thermal stress, and increased maintenance costs due to frequent replacement. Our silicon carbide ceramics effectively address these challenges through material optimization and structural design.
For example, in a high-temperature heat treatment furnace project of a large metallurgical enterprise, the originally used alumina ceramic protective tube experienced severe oxidation and peeling after running at 1450 ℃ for 3 months, resulting in temperature measurement failure. After replacing with the high-purity silicon carbide protective tube customized by our company, it operated continuously for 18 months without any abnormalities, with a stable surface oxide layer and temperature measurement accuracy maintained within ± 2 ℃. The customer’s equipment shutdown rate decreased by 60%.
Another case comes from a semiconductor equipment manufacturer whose diffusion furnace ceramic boat is prone to corrosion in a high-temperature chlorine containing atmosphere, affecting the yield of crystal circles. We have developed a high density, low porosity silicon carbide ceramic boat for it. After on-site verification, it has been continuously operated for 500 hours in a Cl ₂ atmosphere at 1200 ℃, with no corrosion marks on the surface and a particle release rate of less than 0.1 μ g/cm ², significantly improving product yield.

If you are looking for a high-temperature resistant, anti-oxidation, and long-life silicon carbide ceramic solution, please feel free to contact us and provide specific operating parameters. We will provide you with free technical consultation and customized solutions.

Brudeze Ceramics supplies and sells a wide range of high-quality quartz glass, including alumina ceramics, zirconia ceramics, silicon nitride ceramics, aluminum nitride ceramics, silicon carbide ceramics, boron carbide ceramics, bioceramics, machinable ceramics, etc. We can meet the customization requirements of various ceramic products.