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Silicon nitride

Description References

Silicon nitride

CAS No.12033-89-5
Chemical Name:Silicon nitride
CBNumber:CB8744847
Molecular Formula:N4Si3
Formula Weight:140.2833
MOL File:12033-89-5.mol

Silicon nitride Property

Melting point 1900 °C
Density 3.44 g/mL at 25 °C (lit.)
bulk density 0.046g/mL
refractive index 2.8
RTECS VW0650000
form powder
color Pale gray
Specific Gravity 3.44
Resistivity 10*6 (ρ/μΩ.cm)
Water Solubility Insoluble water.
Crystal Structure Hexagonal
Hydrolytic Sensitivity 1: no significant reaction with aqueous systems
Merck 14,8497
Stability Stable.
CAS DataBase Reference 12033-89-5(CAS DataBase Reference)
EWG's Food Scores 1
FDA UNII QHB8T06IDK
EPA Substance Registry System Silicon nitride (Si3N4) (12033-89-5)
UNSPSC Code 41116107
NACRES NA.24

Safety

Hazard Codes :Xi
Risk Statements :37
Safety Statements :22-24/25
WGK Germany :3
F :10
TSCA :Yes

NFPA 704:

	0
0		0

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal wordWarning
Hazard statements H315-H319
Precautionary statements P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313

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Brand: Sigma-Aldrich(India)
Product number: 636703
Product name : Silicon nitride
Purity: nanopowder, <50?nm particle size (spherical), ≥98.5% trace metals basis
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Product number: 334103
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Brand: Sigma-Aldrich(India)
Product number: 334103
Product name : Silicon nitride
Purity: powder, ≥99.9% trace metals basis
Packaging: 25G
Price: ₹9461.05
Updated: 2022/06/14
Buy: Buy

Silicon nitride Chemical Properties,Usage,Production

Description Silicon nitride (molecular formula Si3N4) is a kind of chemical compound comprised of both silicon and nitrogen elements. It appears as a white solid with a high melting point. It is chemically stable upon the presence of dilute HF and hot H2SO4. It has a series of properties such as high strength among a wide temperature range, high fracture toughness, high hardness, outstanding wear resistance and chemical property. It has a strikingly high thermal shock resistance. It has a wide applications in various kinds of fields. In automobile industry, it is an important materials for engine parts. It can also be applied to the manufacturing of bearings due to its high shock resistance. For example, in spacecraft, silicon nitride ceramic is capable of surviving the severe thermal shock generated in the hydrogen/oxygen rocket engines. It can also be used as abrasive and cutting tools due to its harness and resistance to wear. In electronics, it can be used as an insulator and chemical barrier during the production of integrated circuits. There are several method for the manufacturing the silicon nitride. 1. The powdered silicon is subject to a heating reaction of 1300-1400 °C in the atmosphere of nitrogen. 2 Diimide route which involves the reaction of SiCl and NH3. 3 Silicon dioxide is subject to carbothemral reduction at 1300-1400 °C under the presence of nitrogen.
References https://en.wikipedia.org/wiki/Silicon_nitride
http://accuratus.com/silinit.html
Chemical Properties slightly beige powder
Physical properties Gray amorphous powder or crystals. Resistant to thermal shock. Good oxidation resistance up to 1500°C but decomposes into nitrogen and silicon above 1850°C. Excellent corrosion resistance to molten nonferrous metals such as Al, Pb, Zn, Cd, Bi, Rb, and Sn, and molten salts like NaCl-KCl, NaF, and silicate glasses. However, corroded by molten Mg, Ti, V, Cr, Fe, and Co, cryolite, KOH, and Na₂O.
Uses As high tempereture engineering material for use in gas turbines, diesel engines.
Uses Silicon Nitride is used in preparation of thermal conductive Poly(Me Methacrylate)/Silicon Nitride nanocomposites via click chemistry.
Uses Silicon nitride (Si3N4), resistant to oxidation, is an excellent coating for metals, as well as an adhesive and abrasive, and it is used in high-temperature crucibles. It has proven useful as heat-resistant substance for the nozzles on rocket engines.
General Description Silicon nitride based ceramics possess high fracture toughness, hardness and wear resistance, resistance to corrosion, thermal stability. Two known polymorphs of silicon nitride exist, alpha and beta Si₃N₄, both have hexagonal structure. A study shows that a third state, cubic spinel structure, has also been synthesized.
Flammability and Explosibility Non flammable