Silicon Carbide Raw Materials

Silicon carbide raw materials

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The pressure free sintered silicon carbide has the following characteristics::

1.High thermal conductivity:

The thermal conductivity of the pressure free sintered silicon carbide is much higher than other corrosion resistant materials The pressure free sintered silicon carbide occupies a smaller heat transfer area with the same heat exchange efficiency This material allows for a smaller heat exchanger size The pressure free sintered silicon carbide significantly reduces occupied space, which saves money.

2. Anti-corrosion:

This material features a high corrosion, oxidation and erosion resistance. The pressure free sintered silicon carbide can withstand high concentrations of sulfuric acid, nitric acid, phosphoric acid, mixed acid, strong alkali, oxidant, and other highly corrosive materials This material is the only ceramic material that cannot be corroded by hydrofluoric acid. It has an excellent service life. The following are the results of different corrosion resistance levels in different solution:

Corrosive medium		Temperature（℃）	Corrosion rate mg/cm2.Y	Corrosion rate mm/Y
98%H2SO4	Sulfuric acid	100	0.98	0.0032
54%HF	Hydrofluoric acid	25	0.06	0.0002
50%NaOH	Sodium hydroxide	100	1.25	0.0040
45%KOH	Potassium hydroxide	100	0.04	0.0001
70%HNO3	Nitric acid	86	0.04	0.0001
37%HCL	Hydrochloric acid	25	0.07	0.0002
10%HF&HNO3	Hydrofluoric acid & nitric acid	25	0.05	0.0002
10%HF&HNO3	Hydrofluoric acid & nitric acid	120	1.25	0.0040

3. Excellent thermodynamic properties

High strength and high hardness The pressure free sintered silicon carbide has a high abrasion resistance and anti-penetrant efficiency under high temperature and high pressure conditions. This material allows the medium to pass through at high speeds. It can work normally at 1300 ℃.

Detected Items	Detection result
Volume density	3.12 g/cm3
Bending strength	400 MPa
Strength of anti-static pressure	20 MPa
Elastic modulus	410 GPa
Fracture toughness	3.80 Mpa*m1/2
Heat conductivity(room temperature)	140 W/m*K
Coefficient of thermal expansion	4.66（RT-1000oC）10-6/K

Compared with heat exchangers made suing other materials, the heat exchanger made of pressure free sintered silicon carbide material has the following advantages: The silicon carbide heat exchanger has a lower price and shorter delivery period, compared to noble metals such as tantalum, zirconium and hastelloy alloy. This heat exchanger features a higher strength, higher purity and stronger corrosion resistance in comparison with graphite heat exchangers. Compared with enamel heat exchangers, heat exchangers made using a pressure free sintered silicon carbide has a stronger acid resistant performance, which avoids chipping that occurs when using enamel materials. Our heat changer has an excellent thermal conductivity and stronger pressure resistance which can reach 100Bar in the tests compared with Teflon heat exchangers.