Recrystallized silicon carbide materials have excellent comprehensive properties, so they are valued in many fields. The following is an introduction in five aspects: structural materials, porous materials, heat exchangers, electrical functional materials and composite materials.

1. Structural materials

Recrystallized silicon carbide is mainly used as a structural material for its excellent high-temperature mechanical properties, such as kiln furniture, roller bars, shed boards, beams, silicon wafer processing bearings, etc. It is one of the few in the air above 1500 °C It can be used as one of the materials for the carrier. Utilizing its high strength and high thermal conductivity, the sagger and shed can be made very thin, which can effectively reduce the height of kiln furniture, greatly reduce the loading ratio of kiln furniture and porcelain pieces to be fired, and improve the utilization rate of the kiln. Realize the rapid firing of ceramics, multiply the kiln products and reduce the unit energy consumption of the kiln.

2. Porous materials

Due to the preparation process, recrystallized silicon carbide does not require or only needs a small amount of pore-forming agent to obtain high porosity. In addition, it will not shrink at all during the firing process, so there will be no stress inside it that will cause the material cracked or bent. The advantages of recrystallized silicon carbide are especially obvious when preparing large-scale products, because its porosity will not be affected by the firing temperature like other porous ceramics, so it is not necessary to reduce the firing temperature and sacrifice the strength of the material to ensure porosity. The current application areas include diesel vehicle exhaust filtration, metal smelting filtration, fossil fuel air filtration, etc.

3. Heat exchange materials

Because of its high thermal conductivity and light absorption rate, recrystallized silicon carbide is made into honeycomb ceramics for solar collectors in solar power towers, which absorb and convert the reflected strong light into heat to heat the air to drive steam turbines to generate electricity. Good oxidation resistance and excellent thermal shock resistance make its working temperature above 1100°C, and it has been successfully used in 200kW power generation towers.

4. Electric heating materials

Recrystallized silicon carbide can be used as a high-temperature igniter, and its working temperature is a high-temperature oxidizing condition close to 1500°C. However, due to the large number of connected pores in the igniter, the oxidizing gas can enter the interior through the connected pores during use, and react with silicon carbide on the surface of the pores to form silicon dioxide. However, since silicon dioxide is an insulator, as the oxidation increases, the oxide layer becomes thicker, which reduces the conductive cross-sectional area of the igniter, thereby reducing the heating efficiency. At present, the adverse effects can be reduced by impregnating the slurry containing Si3N4 particles into the porous silicon carbide to make it enter the pores to form a protective layer.

5. Composite materials

The porous and interconnected structure of recrystallized silicon carbide provides the conditions for its compounding with other materials, especially materials in liquid phase such as metals or intermetallic compounds. In this way, composite materials with excellent properties of metal and ceramics can be obtained, such as Al-RSiC, Cu-RSiC, etc., which can be used for electronic packaging materials.