Shih PingEn

Silicon carbide

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INDEX

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Production.

Properties.

Applications.

Production

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1893: Henri Moissan discovered silicon carbide

The mineral was named moissanite in his honor

Synthetic silicon carbide: Acheson graphite electric resistance furnace with high temperature 1700 - 2500°C

Production

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The material formed in the Acheson furnace varies in purity

Silicon carbide exists in about 250 crystalline forms

The most common is Alpha silicon carbide. It is formed at temperatures > 1700°C

Properties

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Low density.High strength.Low thermal expansion.High thermal conductivity.High hardness.High elastic modulus.Excellent thermal shock resistance.Superior chemical inertness.

Properties

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Apperance: Gray, Black sometimes colourless.

Flexural strength (MPa):550; gray iron 350.

Hardness (Mohs): 9.6; diamond 10.

Density (g/cm³): 3.21; diamond 3.5.

Melting point(ºC): 2730; Si 1410°C.

Specific heat(J/KgK): 750; Si 700; Ge 320.

Applications

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Such as:

- Automobile parts: Disc brake, sensitive sensor, etc.

- Power plants: nuclear fuel particle coatings, nuclear fuel cladding.

- Steel production and graphene production.

- Ballistic vest.

- Jewelry.

- Cutting tools.

-…(s,c). However, what is really interesting is its application on the field of

the power electronic:

Examples

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SiC ceramic.

SiC tubes.

SiC ring.

Applications

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 Schottky diodes, tryristors, MOSFETs, IGBT, etc.

Characteristics:

- Ultrafast.

- High Thermal properties.

- High Voltage work condition.

- Better system efficiency.

First Commercial Silicon Carbide Power MOSFET

Infineon’s 3G SiC Schottky diodes, in both DPAK and TO-220 package

Applications

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  - Ultrafast switching frequency:

- High performance PFC(Power Factor

Compensation)-inverter for air-conditioning.

- High performance frequency variable motor drives.

Applications

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  - High Thermal properties (3x of Si aprox):

- Solar inverter less of power losses.

- Chip size reduction …economical benefices.

Applications

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  - High Thermal properties (3x of Si aprox):

- Solar inverter less of power losses.

- Chip size reduction …economical benefices.

Applications

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  - High Voltage work condition:

Breakdown V aprox. 10x of Si.Motor control and power supplies:

-Industrial motor drive. 600~1200 V

- Automotive 600~1200 V

- Elevator, automation. 600~1700 V

- Power supply Alternative sources. 600~1200 V

- Electric railway system. 1200~6500V

- Power network. >10kV

Bibliography

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http://www.i-micronews.comhttp://www.eeweb.comhttp://www.articlesbase.comhttp://www.wikipedia.comhttp://semisouth.com/archives/155http://powerelectronics.comhttp://

www.cree.com/products/pdf/CMF20120D.pdfhttp://accuratus.com/silicar

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Thank you for your time!

SPEed Works.Have a good time!

For questions send an e-mail to pinshi@etsid.upv.es

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