Basic information Uses Safety Supplier Related
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Silicon carbide

Basic information Uses Safety Supplier Related

Silicon carbide Basic information

Product Name:
Silicon carbide
Synonyms:
  • Silicon carbide -400 Mesh particle size, >=97.5%
  • NCI-H205 Cell
  • CARBORUNDUM BOILING CHIPS, 14 MESHCARBORUNDUM BOILING CHIPS, 14 MESHCARBORUNDUM BOILING CHIPS, 14 MESHCARBORUNDUM BOILING CHIPS, 14 MESH
  • CARBORUNDUM BOILING CHIPS, 20 MESHCARBORUNDUM BOILING CHIPS, 20 MESHCARBORUNDUM BOILING CHIPS, 20 MESHCARBORUNDUM BOILING CHIPS, 20 MESH
  • CARBORUNDUM BOILING CHIPS, 4 MESHCARBORUNDUM BOILING CHIPS, 4 MESHCARBORUNDUM BOILING CHIPS, 4 MESHCARBORUNDUM BOILING CHIPS, 4 MESH
  • CARBORUNDUM BOILING CHIPS, 8 MESHCARBORUNDUM BOILING CHIPS, 8 MESHCARBORUNDUM BOILING CHIPS, 8 MESHCARBORUNDUM BOILING CHIPS, 8 MESH
  • Silicon carbide nanowhiskers
  • Silicon carbide nanofiber, D <2.5 mum, L/D >= 20, 98% trace metals basis
CAS:
409-21-2
MF:
CSi
MW:
40.1
EINECS:
206-991-8
Product Categories:
  • Inorganics
  • Carbides
  • Ceramics
  • Metal and Ceramic Science
  • CarbidesMaterials Science
  • 14: Si
  • -
  • Nanomaterials
  • Nanoparticles: Oxides, Nitrides, and Other CeramicsNanomaterials
  • Nanopowders and Nanoparticle Dispersions
  • metal borides and carbides
Mol File:
409-21-2.mol
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Silicon carbide Chemical Properties

Melting point:
2700 °C(lit.)
Density 
3.22 g/mL at 25 °C(lit.)
refractive index 
2.6500
solubility 
Soluble in molten sodium hydroxide, potassium hydroxide and in molten iron.
form 
nanopowder
color 
Green
Specific Gravity
3.22
Water Solubility 
Soluble in molten alkalis (NaOH, KOH) and molten iron. Insoluble in water.
Merck 
14,8492
Stability:
Stability
InChIKey
HBMJWWWQQXIZIP-UHFFFAOYSA-N
NIST Chemistry Reference
Silicon monocarbide(409-21-2)
EPA Substance Registry System
Silicon carbide (SiC)(409-21-2)
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Safety Information

Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
26-36
WGK Germany 
3
RTECS 
VW0450000
TSCA 
Yes
HS Code 
28492000
Hazardous Substances Data
409-21-2(Hazardous Substances Data)

MSDS

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Silicon carbide Usage And Synthesis

Uses

Silicon carbide (SiC), nearly as hard as diamonds, is used as an abrasive in grinding wheels and metal-cutting tools, for lining furnaces, and as a refractory in producing nonferrous metals.

Description

Silicon carbide is a hard covalently bonded material predominantly produced by the carbothermal reduction of silica. Silicon carbide is made by heating silica sand and petroleum coke packed around electrodes in an electric resistance furnace to above 2200°C. Depending on the exact reaction conditions the resulting silicon carbide is either a fine powder or a bonded mass that requires crushing and milling to produce a usable feedstock. This material is very resistant to abrasion and to corrosion with a molten slag. It also has excellent resistance to thermal spalling. However as it is a carbide, it will oxidise readily, silicon carbide has a fairly high conductivity.
Several hundred structures of silicon carbide (polytypes) have been identified which have different stacking arrangements for the silicon and carbon atoms. The simplest structure is a diamond structure which is designated /3-SiC. Other structures are either hexagonal or rhombic and are referred to as a-SiC.

Chemical Properties

Silicon carbide is a yellow to green to bluishblack, iridescent crystalline substance. Colorless when pure.

Chemical Properties

light grey powder

Physical properties

the properties of silicon carbide are that it is a refractory material (high melting point), it has excellent thermal conductivity and low thermal expansion, consequently it displays good thermal shock resistance. In addition, the high hardness, corrosion resistance and stiffness lead to a wide range of applications where wear and corrosion resistance are primary performance requirements. Silicon carbide possesses interesting electrical properties due to its semiconductor characteristics, the resistance of different compositions varying by as much as seven orders of magnitude.

Characteristics

Silicon carbide is a premium-priced unit which is employed in lining work for its uniformity, abrasion resistance and dimensional stability. It is resistant to most organics, inorganic acids, alkalis and salts in a variety of concentrations except to hydrofluoric acid and acid fluorides. The permeable units have the lowest resistance.

Uses

Industry
Application
Role/benefit
Abrasive machining processes
Processing of glass, ceramic, stone, refractory, hard alloy, etc.
Abrasive and cutting tools/durability and low cost
Electronic
Light-emitting diodes
Component/electroluminescence property
Semiconductor devices
Component/has wide forbidden band (2.86 EV) and p and n two conductive types
Electric systems
Gapped SiC lightning arresters
Resistance/voltage-dependent property
Sic switches and SiC Schottky diodes
Raw material/anti high-temperature and high-voltage properties
Ceramics
Hard ceramics used for composite armor, bulletproof vests, etc.
Raw material/low density and high strength
Temperature ceramics
Raw material/has high intensity at High temperature
Astronomy
Astronomical telescopes
Mirror material/low thermal expansion coefficient, high hardness, rigidity and thermal conductivity
Aerospace
Gas filter and combustion chamber nozzle
Raw material/anti high-temperature property
Silicon carbide fibre
Reinforcing of metal,resin,alloy,glass,etc.
Reinforcing material/helps to improve all kinds of features
Heat shield material, high temperature filter cloth and conveyor belt
Raw material/anti high-temperature property
Automobile
Brake discs
Ingredient/helps to increase temperature resistance
Sintered form for diesel particulate filters
Ingredient/anti high-temperature property
Oil additive
Helps to educe friction, emissions, and harmonics
Carbon
Graphene production
Raw material
Manufacture of biochar
Coating material/helps to improve the Hardness, strength and wear resistance
Alchemy blast furnace brick
Raw material/anti high-temperature property
Graphite electrode production
Coating component/increase the coating capacity of rapid temperature change
Others
Thin filament pyrometry
Filament material/anti high-temperature property
Nuclear fuel particles
Ingredient/anti high-temperature property
Nuclear fuel cladding
Synthetic moissanite gemstone
Raw material/similar to diamond in several important respects
Steel production
Additional fuel/allows the furnace to process more scrap with the same charge of hot metal
Catalyst support
Support material/large surface area
Carborundum printmaking
Paste material for ink plate
 

Uses

Silicon carbide is widely used as an abrasive in grinding and cutting glasses; in polishing glass and sharpening stones. It is used in the manufacture of porcelain, refractory brick, furnace linings, and emery paper. The compound also is used in semiconductor technology.

Definition

Bluish-black, iridescent crystals. Insoluble in water and alcohol; soluble in fused alkalies and molten iron. Excellent thermal conductivity, electrically conductive, resists oxida- tion at high temperatures. Noncombustible, a nui- sance particulate.

Preparation

Silicon carbide is prepared by fusing a mixture of silica (sand) and carbon (coke) with some salt and saw dust in an electric arc furnace at 3000°C.
SiO2(Sand)+3C(Coke)--(3000℃)--Sic+2CO
Salt and saw dust is added to infuse air into the product so that it can be broken into pieces easily. The product obtained is first washed with strong acid followed by strong base to remove basic and acidic impurities respectively. Finally, it is washed with water.

General Description

Yellow to green to bluish-black, iridescent crystals. Sublimes with decomposition at 2700°C. Density 3.21 g cm-3. Insoluble in water. Soluble in molten alkalis (NaOH, KOH) and molten iron.

Reactivity Profile

Silicon carbide is non-combustible. Generally unreactive. Soluble in molten alkalis (NaOH, KOH) and in molten iron.

Hazard

Upper respiratory tract irritant. Probable carcinogen.

Industrial uses

Silicon carbide is one of the very few totally man-made minerals used in refractory work. These are:
Oxide-bonded-(S102, A1201, Si02 or silicate glass), silicon oxynitride (Si2 ON2), silicon nitride (S13N4)
The first three of these four bonding systems result in a permeable product, and when failure occurs in such masonry systems due to chemical degradation, it is usually due to attack on the bond. Thus, permeable units (where the corrodent penetrates the mass) are far more rapidly damaged.
Self-bonded”—(silicon carbide to silicon carbide) impermeable ones, where the attack is limited to the surface.
The self-bonded product can be manufactured by either of two methods: reaction bonded or sintered. Both will produce an impermeable unit, and they have roughly comparable chemical resistances, but they do not have identical physical properties.

Safety Profile

Suspected carcinogen with experimental neoplastigenic data. A nuisance dust.

Potential Exposure

A potential danger to those involved in the manufacture of silicon carbide abrasives, refractories, and semiconductors. Silicon carbide fibers are also produced in fibrous form as reinforcing fibers for composite materials.

Incompatibilities

Dust may form explosive mixture with air. Sublimes with decomposition @ 2700C.

Waste Disposal

Landfill

References

1.https://en.wikipedia.org/wiki/Silicon_carbide#Uses
2.http://www.softschools.com/formulas/chemistry/silicon_carbide_uses_properties_structure_formula/282/
3.https://www.britannica.com/science/silicon-carbide
4.http://accuratus.com/silicar.html
5.https://www.intechopen.com/books/mostdownloaded/silicon-carbide-materials-processing-and-applications-in-electronic-devices
6.https://www.azom.com/article.aspx?ArticleID=3271
7./ProductChemicalPropertiesCB2431905.htm

Silicon carbideSupplier

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