A Summary of SiC Materials

adventure of life
2 min readJul 21, 2022

In essence, silicon carbide ceramics are one of the most sophisticated materials. Its name implies that it is composed of silicon and carbon. It occurs in nature as a rare variety of the mineral moissanite. Ceramic made of silicon carbide has been manufactured since 1893. The granules of this substance may be bound. Making anything complicated is the goal. The need for this material has increased along with the demand for space technology, nuclear energy, automobiles, and marine engineering. Let’s learn more.

These ceramic materials have a wide variety of outstanding qualities, including resistance to high temperatures, resistance to chemical corrosion, resistance to thermal shock, increased hardness, and resistance to thermal expansion.

This is why this material is widely used in various sectors, including automotive, chemical, energy, information electronics, space technology, and environmental protection.

These ceramics are used in various sectors as corrosion-resistant containers, including the petrochemical industry. This substance is used in different equipment, including cutting tools, bearings, and mechanical seal components. In addition, it is an excellent option for many other items, including gas turbines, rocket nozzles, and other engine parts.

Essential Characteristics

Chemical Features

When the temperature of an oxygen reaction reaches 1300 Celsius, a protective layer forms on the crystal surfaces. The strength of silicon carbide increases as the protective coatings become thicker.

Silicon carbide has strong acid resistance in terms of compound resistance, alkalinity, and acidity. However, it lacks enough alkaline resistance.

Physical Features

Almost all varieties of silicon carbide crystals are the same when looking at density. This substance measures 9.5 Mohs in terms of hardness. Additionally, the Knoop hardness ranges from 2670 to 2815 kg/mm. The good news is that this degree of hardness is far greater than most abrasives, even diamonds.

Thermal conductivity and thermal shock resistance are both excellent. SiC ceramic is one of the finest refractory materials since its thermal expansion characteristics are not spectacular.

Powerful Qualities

Commercial silicon carbide ceramic functions as a kind of semiconductor at a constant temperature. As the temperature rises, the material’s internal resistance decreases. In addition, this material’s conductivity varies depending on the impurities.

favourable hydrophilicity

Strong covalent bonds are present in silicon carbide ceramics, which are hydrophilic. Pauling’s calculations on electronegativity show that this material’s ionic property is just 12 per cent. As a result, we can say that this material has a high degree of hardness, a large elastic modulus and poor wear resistance.

In conclusion, this article provided an overview of silicon carbide ceramic. We hope this summary will give you a better grasp of this subject. This material is employed in various sectors since it has many exceptional qualities.



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