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ChemicalBook > Product Catalog >Inorganic chemistry >Inorganic salts >Carbides and carbonates >Silicon carbide

Silicon carbide

Silicon carbide Structure
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
Molecular Weight:
40.1
MOL File:
409-21-2.mol
Modify Date:
2024/4/22 16:00:31
Request For Quotation

Silicon carbide 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
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)

Silicon carbide Properties

Modulus of Elasticity 459 - 476 GPa
Poissons Ratio 0.14, sintered
Shear Modulus 180 GPa, Calculated
Knoop Microhardness 3000, at 25°C

SAFETY

Risk and Safety Statements

Symbol(GHS) 
GHS08
Signal word  Danger
Hazard statements  H350i
Precautionary statements  P201-P202-P280-P308+P313-P405-P501
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  26-36
OEB B
OEL TWA: 10 mg/m3 (total)
WGK Germany  3
RTECS  VW0450000
TSCA  Yes
HS Code  28492000
NFPA 704
0
1 0

Silicon carbide price More Price(54)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich(India) 776742 Silicon carbide nanofiber, D <2.5?μm, L/D ≥ 20, 98% trace metals basis 409-21-2 25G ₹15588 2022-06-14 Buy
Sigma-Aldrich(India) 594911 Silicon carbide nanopowder, <100?nm particle size 409-21-2 100G ₹58574.08 2022-06-14 Buy
Sigma-Aldrich(India) 594911 Silicon carbide nanopowder, <100?nm particle size 409-21-2 250G ₹79845.2 2022-06-14 Buy
Sigma-Aldrich(India) 378097 Silicon carbide -200?mesh particle size 409-21-2 250G ₹7176.98 2022-06-14 Buy
Sigma-Aldrich(India) 378097 Silicon carbide -200?mesh particle size 409-21-2 1KG ₹13715.28 2022-06-14 Buy
Product number Packaging Price Buy
776742 25G ₹15588 Buy
594911 100G ₹58574.08 Buy
594911 250G ₹79845.2 Buy
378097 250G ₹7176.98 Buy
378097 1KG ₹13715.28 Buy

Silicon carbide Chemical Properties,Uses,Production

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.

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

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.

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.

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.

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.

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.

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.https://www.chemicalbook.com/productchemicalpropertiescb2431905.htm

Silicon carbide Preparation Products And Raw materials

Raw materials

Hydrogen Sulfide Argon silicon carbide fiber CARBON MONOXIDE Delayed petroleum coke
Carbon Black 1,3-Bis(Chloromethyl)-1,1,3,3-Tetramethyldisiloxane Methyltrichlorosilane Tetrachlorosilane carbosilane
Silicon dioxide Silicon nitride Dichlorodimethylsilane Quartz Fumed Silica
High purity Graphite
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Preparation Products

ETHYLENE OXIDE Carbon tetrafluoride

Silicon carbide Suppliers

Global( 298)Suppliers
Supplier Tel Country ProdList Advantage Inquiry
Triveni chemicals 08048762458 New Delhi, India 6093 58 Inquiry
Aritech Chemazone Private Limited +91-9034345475 Punjab, India 684 58 Inquiry
Central Drug House(P) Ltd. 91-11-49404040 New Delhi, India 6160 58 Inquiry
Indian Abrasives 08046031568 Haryana, India 2 58 Inquiry
Sai Sharada Marketing Services 08046051169 Pune, India 1 58 Inquiry
Intelligent Materials Private Limited 08048953178 Punjab, India 197 58 Inquiry
L.S. Abrasives & Trading Co. 07942564976 Haryana, India 1 58 Inquiry
Mandeep Minerals 08048975503 Gujarat, India 2 58 Inquiry
Shree Bajrang Sales (P) Ltd. 08046047889 Nagpur, India 39 58 Inquiry
Nano Research Elements 08048372588Ext 365 Delhi, India 101 58 Inquiry
Supplier Advantage
Triveni chemicals 58
Aritech Chemazone Private Limited 58
Central Drug House(P) Ltd. 58
Indian Abrasives 58
Sai Sharada Marketing Services 58
Intelligent Materials Private Limited 58
L.S. Abrasives & Trading Co. 58
Mandeep Minerals 58
Shree Bajrang Sales (P) Ltd. 58
Nano Research Elements 58

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