Advanced materials, such as graphite and Sintered Silicon Carbide (SSiC), are indispensable in industries requiring efficiency, forethought and resilience. SSiC is an extremely hard and resilient ceramic that stands up well to high temperatures, corrosion and oxidation.
Reaction boned and sintered SSiC are produced using two distinct processes. Sintering, which densifies green body by applying pressure and temperature, differs significantly.
Strength and Durability
Silicon Carbide is one of the hardest synthetic materials, boasting a Mohs hardness rating of 9, which rivals that of diamond. Additionally, its properties make it extremely strong and corrosion resistant as well as being capable of withstanding high temperatures and wear conditions.
Sintered Silicon Carbide is created using advanced production techniques known as sintering. Raw materials are ground into fine powder form, mixed with non-oxide binders and processed through conventional ceramic forming methods (extrusion for tubes; cold isostatic pressing for plates and blocks) before being sintered in an inert atmosphere at high temperatures.
Blasch ULTRON SiC is a direct-sintered grade with superior strength that remains constant at high temperatures, offering superior performance compared to reaction-bonded grades of SiC. Furthermore, its exceptional resistance to chemical attack and high pressure makes SSiC ideal for workpieces such as seal rings and counterfaced components used for hardface pair sealing applications as well as CMM bridges, Z-axes, and position control systems due to its specific stiffness and lightweight characteristics.
Lightweight
As the aerospace industry pushes for ever-higher standards of efficiency, performance, and sustainability, advanced materials like Sintered Silicon Carbide have become invaluable enablers. Their success in harsh conditions demonstrates technological proficiency as well as dedication to shaping an aerospace future characterized by excellence.
SSiC’s low density makes it an ideal material for jet engine components, providing fuel efficiency while decreasing aircraft weight. Furthermore, its resistance to thermal shock and mechanical fatigue allows it to withstand high temperatures as well as moisture absorption and space radiation radiation.
Sintering is a rigorous process. High-purity silicon carbide powders are compacted at extreme temperatures in a controlled environment until they achieve an ultra high density, leading to an exceptionally dense material with close thermal expansion properties to that of silicon, making SSiC an excellent candidate for use at elevated temperatures. Furthermore, this process may include additives like boron nitride (an electrical insulator) to achieve high electrical resistivity for maximum electrical conductivity.
Corrosion Resistance
Morgan’s Purebide Sintered Silicon Carbide is designed for maximum abrasion and corrosion resistance across a variety of environments. With hardness, strength, and thermal conductivity delivering optimal performance in harsh industrial applications.
Corrosion resistance can be increased through the addition of free graphite to the material, which increases lubricity and allows more contact between mating pairs. This results in greater PV capability between hardfaces as well as superior resistance against chemical and abrasive corrosion.
Reaction bonded SiC is produced by infiltrating carbon-SiC mixtures with liquid silicon, which reacts to form more SiC. While reaction bonded SiC offers lower hardness and strength compared to sintered silicon carbide, its rapid temperature fluctuations make it suitable for thermal shock resistance applications.
Sintered silicon carbide is denser than its reaction-bonded counterpart, making it more able to tolerate higher temperatures during sintering. Due to this characteristic, sintered silicon carbide makes an ideal material for dry gas mechanical seal applications.
Thermal Conductivity
SSiC’s high thermal conductivity helps aerospace components both reduce weight and enhance performance, such as mechanical seals. For instance, carbon mechanical seals made of this material have proven extremely helpful in increasing lubricity while increasing pressure velocity capacity between hardfaced mating pairs.
SSiC stands out with its combination of thermal conductivity, corrosion resistance and hardness – two properties that make it suitable for applications in harsh environments where chemicals or abrasive materials exist. This makes SSiC the ideal material to choose when applied in these harsh conditions.
Reaction bonded silicon carbide ceramic is made by infiltrating compacts composed of SiC and carbon with liquid silicon, allowing it to bond to initial SiC particles. Alternatively, this form can also be produced using conventional ceramic forming methods with non-oxide sintering aids for non-oxide sintering aids used with high purity silicon carbide powder sintering aids without oxide-reducing agents as non-oxide sintering aids; both forms offer higher strength, better resistance against corrosion resistance as well as lower thermal conductivity than direct sintered SSiC forms which use nano-grade raw powder while direct sintered forms use micron-sized powder which has significantly more thermal conductivity compared with its counterpart.
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