Silicon Carbide

• CAS No:

409-21-2

• Formula:

CSi

• Chemical Name:

Silicon Carbide

Description

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

Silicon carbide appears as 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.|DryPowder; DryPowder, PelletsLargeCrystals; DryPowder, WetSolid; OtherSolid; PelletsLargeCrystals|YELLOW-TO-GREEN-TO-BLUE-TO-BLACK CRYSTALS, DEPENDING ON PURITY.|Yellow to green to bluish-black, iridescent crystals.

Silicon carbide appears as 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.|Silicon carbide is an organosilicon compound.

Silicon Carbide Basic Attributes

Molecular Weight ：40.09620

Exact Mass ：39.97690

EC Number ：206-991-8

ICSC Number ：1061

DSSTox ID ：DTXSID5052751

Color/Form ：EXCEEDINGLY HARD, GREEN TO BLUISH-BLACK, IRIDESCENT, SHARP CRYSTALS|HEXAGONAL OR CUBIC|Yellow to green to bluish black, iridescent crystals.

Characteristics

PSA ：0

XLogP3 ：-0.29950

Appearance ：Light grey powder

Density ：3.23 g/cm³

Melting Point ：2600 °C

Boiling Point ：Sublimes

Refractive Index ：2.65

Water Solubility ：soluble in molten sodium hydroxide, potassium hydroxide and in molten iron. | soluble in molten alkalis (NaOH, KOH) and molten iron. Insoluble in water.

Storage Conditions ：Store in a dry area.

Vapor Pressure ：0 mmHg (approx)

Flammability characteristics ：Noncombustible Solid

Experimental Properties ：DIELECTRIC CONSTANT: 7.0; HARDNESS: 9.5; ELECTRON MOBILITY: GREATER THAN 100 SQ CM/VOLT-SEC; HOLE MOBILITY: GREATER THAN 20 SQ CM/VOLT-SEC; BAND GAP ENERGY: 2.8 ELECTRON-VOLTS|SUBLIMES WITH DECOMPOSITION AT 2700 °C|EXCELLENT THERMAL CONDUCTIVITY; ELECTRICALLY CONDUCTIVE; RESISTS OXIDATION AT HIGHER TEMPERATURES

Air and Water Reactions ：No rapid reaction with air No rapid reaction with water

Reactive Group ：Nitrides, Phosphides, Carbides, and Silicides

Reactivity Profile ：SILICON CARBIDE is non-combustible. Generally unreactive. Soluble in molten alkalis (NaOH, KOH) and in molten iron.

Ionization Potential ：9.30 eV

Flammable Limits ：Noncombustible Solid

Silicon Carbide Use

The hardness is very large, about 9 degrees Mohs. After grinding, it can be used as grinding powder, polishing paper, friction surface of grinding wheel and whetstone. Abrasive. High temperature resistant materials. Manufacturing high-purity single crystals and semiconductors. Used as a soap synergist and to prevent the bar soap from leaching out and blooming. It has a strong emulsifying effect on lubricating oil and fat, and can be used to adjust the pH value of buffer soap. Water softener for industrial water. Leather tanning agent. Dyeing aid. Used as dispersant in the preparation of suspension in paint, kaolin, magnesium oxide, calcium carbonate and other industries. Drilling mud dispersant. Used as anti-oil stain agent in paper industry. It can be used as the reinforcing fiber of resin, metal and other composite materials. It can also be used as radio wave absorbing material and heat resistant material. It has quite good high temperature resistance and high strength. It is mainly used for toughening applications that require high-temperature and high-strength application materials. Used in engine burners, high-performance radar materials and infrared fairings, helicopter and jet parts, high-temperature power auxiliary components, etc. in the defense and aerospace fields; used in high-performance multilayer integrated package, multilayer capacitors in the electronics industry ; Used in the automotive industry for catalyst converters, driving system parts, valves and valve seats; in the chemical industry, it can form composite materials with thermoplastic and thermosetting resins to significantly improve the strength, thermal conductivity and wear resistance of plastics. By adding 15% silicon carbide whiskers to PEEK, the thermal conductivity is increased by about 2 times, and the tensile strength of polyimide reinforced with 20% silicon carbide is increased by about 2 times at normal temperature. The effect without enhancement at room temperature is the same. When 15% silicon carbide is added to the epoxy resin, the amount of wear is reduced by 17%. In addition, it is also widely used in ceramics, environmental protection, energy and other fields. Used as a reinforcing fiber and radio wave absorbing material for composite materials such as resins, metals, and ceramics. It is also used as a material for space and space energy. Raw materials for high-density sintered body, high-temperature resistant structural materials, corrosion-resistant and wear-resistant materials.