Silicon carbide
Crystal System Uses- Product Name
- Silicon carbide
- CAS No.
- 409-21-2
- Chemical Name
- Silicon carbide
- Synonyms
- SiC;nanopowder;BLACK SILICON CARBIDE;CARBORUNDUM;Simax;BOILING CHIPS;Silicon carbid;SILICON CARBIDE BLACK;ua1;ua2
- CBNumber
- CB2431905
- Molecular Formula
- CSi
- Formula Weight
- 40.1
- MOL File
- 409-21-2.mol
Silicon carbide Property
- 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
- Resistivity
- 107–200 (ρ/μΩ.cm)
- Water Solubility
- Soluble in molten alkalis (NaOH, KOH) and molten iron. Insoluble in water.
- Crystal Structure
- Cubic, Sphalerite Structure - Space Group F(-4)3m
- Hydrolytic Sensitivity
- 1: no significant reaction with aqueous systems
- Merck
- 14,8492
- Exposure limits
- ACGIH: TWA 10 mg/m3; TWA 3 mg/m3; TWA 0.1 fiber/cm3
OSHA: TWA 15 mg/m3; TWA 5 mg/m3
NIOSH: TWA 10 mg/m3; TWA 5 mg/m3 - Stability:
- Stability
- InChIKey
- HBMJWWWQQXIZIP-UHFFFAOYSA-N
- IARC
- 2A (Vol. 111) 2017
- NIST Chemistry Reference
- Silicon monocarbide(409-21-2)
- EPA Substance Registry System
- Silicon carbide (409-21-2)
Safety
- 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)
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Danger
- Precautionary statements
-
P201Obtain special instructions before use.
P202Do not handle until all safety precautions have been read and understood.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P308+P313IF exposed or concerned: Get medical advice/attention.
P405Store locked up.
P501Dispose of contents/container to..…
N-Bromosuccinimide Price
- Product number
- GF50814873
- Product name
- Silicon carbide
- Purity
- fiber, tex number 209, length 50 m, filament diameter 0.015mm
- Packaging
- 1EA
- Price
- $446
- Updated
- 2024/03/01
- Product number
- GF48263014
- Product name
- Silicon carbide
- Purity
- powder, mean particle size 0.1-1 micron, weight 50?g, purity 99%
- Packaging
- 1EA
- Price
- $257
- Updated
- 2024/03/01
- Product number
- GF47017650
- Product name
- Silicon carbide
- Purity
- fiber, tex number 209, length 10 m, filament diameter 0.015mm
- Packaging
- 1EA
- Price
- $275
- Updated
- 2024/03/01
- Product number
- GF32877445
- Product name
- Silicon carbide
- Purity
- powder, mean particle size 0.1-1 micron, weight 100?g, purity 99%
- Packaging
- 1EA
- Price
- $292
- Updated
- 2024/03/01
- Product number
- GF30991293
- Product name
- Silicon carbide
- Purity
- powder, mean particle size 17 micron, weight 50?g, green
- Packaging
- 1EA
- Price
- $305
- Updated
- 2024/03/01
Silicon carbide Chemical Properties,Usage,Production
Crystal System
SiC takes two types of crystal systems—the cubic structure b-SiC and the hexagonal structure a-SiC. b-SiC takes a zinc blende type structure with a lattice constant of a=0.4349 nm and the spacing between adjacent layers is 0.2512 nm. a-SiC takes many types. 4H and 6H a-SiC have a hexagonal primitive cell with the number of layers of 4 and 6, respectively. 15R, 21R, 33R, and 51R a-SiC have the rhombohedron primitive cell with the number of layers of 15, 21, 33, and 51, respectively.
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
light grey powder
Chemical Properties
Silicon carbide is a yellow to green to bluishblack, iridescent crystalline substance. Colorless when pure.
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.
Physical properties
Green to bluish black, iridescent crystals. Soluble in fused alkali hydroxides. Abrasives best suited for grinding low-tensilestrength materials such as cast iron, brass, bronze, marble, concrete, stone and glass, optical structural, and wear-resistant components. Corroded by molten metals such as Na, Mg, Al, Zn, Fe, Sn, Rb, and Bi. Resistant to oxidation in air up to 1650°C. Maximum operating temperature of 2000°C in reducing or inert atmosphere.
Physical properties
Semiconductor (Eg=3.03 eV) soluble in fused alkali hydroxides
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
Manufacture of abrasives and refractories, brake linings, heating elements, and thermistors.
Uses
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.
Production Methods
SiC was synthesized at the end of the 18th century with the name carborundum, and it was used as abrasive. In 1920 in Russia, O.V. Losev discovered two types of SiC from electro-luminescence and named them Type I and Type II. The electro-luminescence of Type I is greenish blue colored and that of Type II changes from orange to violet via yellow and green as the voltage increases from 6 to 28 V. The pure crystal is nominally obtained as 6H (a-II) SiC and the crystals with impurity are obtained as 15R and 4H. a-SiC (6H, 15R) is mainly synthesized using the sublimation method by heating the mixture of coke and silica sands at 2000℃ in the electrical furnace. SiC is segregated by cooling after melting Si in the carbon crucible.
Production Methods
Silicon carbide, also known by the trade name Carborundum, has been manufactured and used as an abrasive material for more than a century. It combines desirable properties of hardness and thermal resistance. It is produced by heating high-grade silica sand with finely ground carbon at 2400°C in an electric furnace. In its powdered or granular form, it has been used as the abrasive material in “paper and wheels.” It is used as an abrasive in sandblasting and engraving. It has been incorporated into ceramics and glass and especially into refractory ceramic materials.
Reactions
SiC is formed by the reaction with C at high temperature. It is not etched by acid other than the mixture of hydrofluoric acid and nitric acid. It reacts with caustic solution generating H2 to produce alkali silicate. Good alloys can be formed at the composition ratio of 0%–100% with Ge. (Refer to Ge.)
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.
Health Hazard
Silicon carbide, in certain forms, may be a cause of pneumoconiosis in exposed workers. Silicon carbide has generally been considered to be an inert dust with little adverse effect on the lungs.
Flammability and Explosibility
Non flammable
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 carbide Preparation Products And Raw materials
Raw materials
Preparation Products
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View Lastest Price from Silicon carbide manufacturers
- Product
- Silicon carbide 409-21-2
- Price
- US $1180.00-1160.00/Tons
- Min. Order
- 10Tons
- Purity
- 99%
- Supply Ability
- 100Tons
- Release date
- 2023-03-03
- Product
- Silicon carbide 409-21-2
- Price
- US $10.00/kg
- Min. Order
- 1kg
- Purity
- 99.99%
- Supply Ability
- 50000tons
- Release date
- 2023-07-21
- Product
- Silicon carbide 409-21-2
- Price
- US $10.00/kg
- Min. Order
- 1kg
- Purity
- 99.99%
- Supply Ability
- 50000tons
- Release date
- 2023-07-26