Difference between revisions of "Silicon carbide"
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Revision as of 08:55, 28 February 2016
Silicon carbide sample.
| IUPAC name
| Other names
|Molar mass||40.10 g/mol|
|Appearance||Black lustrous solid|
|Melting point||(decomposes) 2,730 °C (4,950 °F; 3,000 K)|
|Safety data sheet||ScienceLab|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Silicon carbide, also known as carborundum is a compound of silicon and carbon with chemical formula SiC, mainly used as an abrasive. Silicon carbide occurs naturally as very rare mineral moissanite.
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Because of the rarity of natural moissanite, most silicon carbide is synthetic. It is used as an abrasive, and more recently as a semiconductor and diamond simulant of gem quality. However the preparation of SiC is too difficult for most amateur scientists.The simplest manufacturing process is to combine silica sand and carbon in an Acheson graphite electric resistance furnace at a high temperature, between 1,600 °C (2,910 °F) and 2,500 °C (4,530 °F). Fine SiO2 particles in plant material (e.g. rice husks) can be converted to SiC by heating in the excess carbon from the organic material. The silica fume, which is a byproduct of producing silicon metal and ferrosilicon alloys, also can be converted to SiC by heating with graphite at 1,500 °C (2,730 °F).
Silicon carbide is non-flammable and non-explosive.
Effects of Exposure: To the best of our knowledge the chemical, physical and toxicological properties of silicon carbide have not been thoroughly investigated and reported. Silicon carbide is a nuisance dust capable of producing nonprogressive pulmonary fibrosis. Silicon carbide implants have caused tumors in laboratory animals.
Acute Effects: Inhalation: May cause irritation. Ingestion: No acute health effects recorded. Skin: May cause abrasive irritation. Eye: May cause abrasive irritation.
Chronic Effects: Inhalation: May cause pneumoconiosis. No other chronic health effects recorded.
Target Organs: No target organs recorded. Medical Conditions Generally Aggravated by
Exposure: Pre-existing respiratory disorders.
Carcinogenicity: NTP: No IARC: No OSHA: No
Silicon carbide is very stable and doesn't require any special storage.