Silicon Carbide

1. Shih PingEn Silicon carbide 31.05.2012 1

2. INDEX 31.05.2012 2 Production . Properties . Applications .

3. Production 31.05.2012 3 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

4. Production 31.05.2012 4 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

5. Properties 31.05.2012 5 Low density. High strength. Low thermal expansion. High thermal conductivity. High hardness. High elastic modulus. Excellent thermal shock resistance. Superior chemical inertness.

6. Properties 31.05.2012 6 Apperance: Gray , Black sometimes colourless . Flexural strength ( MPa ):550; gray iron 350. Hardness (Mohs): 9.6; d iamond 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.

7. Applications 31.05.2012 7 Such as: - Automobile parts: Disc brake, sensitive sensor, etc. - Power plants: nuclear fuel particle coatings , nuclear fuel cladding . - Steel production and g raphene production . - Ballistic vest . - Jewelry . - Cutting tools . -…( s,c ). However, what is really interesting is its application on the field of the power electronic:

8. Examples 31 .05.2012 8 SiC ceramic . SiC tubes . SiC ring.

9. Applications 31.05.2012 9   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

10. Applications 31.05.2012 10   - Ultrafast switching frequency: - High performance PFC(Power Factor Compensation)-inverter for air-conditioning. - High performance frequency variable motor drives.

11. Applications 31.05.2012 11   - High Thermal properties (3x of Si aprox ): - Solar inverter  less of power losses. - Chip size reduction …economical benefices.

12. Applications 31.05.2012 12   - High Thermal properties (3x of Si aprox ): - Solar inverter  less of power losses. - Chip size reduction …economical benefices.

13. Applications 31.05.2012 13   - 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

14. Bibliography 31.05.2012 14 http:// www.i-micronews.com http:// www.eeweb.com http:// www.articlesbase.com http:// www.wikipedia.com http:// semisouth.com/archives/155 http:// powerelectronics.com http:// www.cree.com/products/pdf/CMF20120D.pdf http://accuratus.com/silicar

15. END 31.05.2012 15 Thank you for your time ! SPEed W orks. Have a good time! For questions send an e-mail to [email protected]

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