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Boron nitride

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Boron nitride Basic information

Product Name:
Boron nitride
CAS:
10043-11-5
MF:
BN
MW:
24.82
EINECS:
233-136-6
Mol File:
10043-11-5.mol
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Boron nitride Chemical Properties

Melting point:
2700℃
Boiling point:
sublimes sl below 3000℃ [MER06]
Density 
2.29
storage temp. 
-20°C
form 
Powder
color 
White
Specific Gravity
3.48
PH
5-8 (100g/l, H2O, 20℃)(slurry)
Water Solubility 
Soluble in water (slightly soluble) at 20°C, and water (soluble) at 95°C.
Sensitive 
Hygroscopic
Merck 
14,1346
Stability:
Stable. Incompatible with oxidizing agents, water.
CAS DataBase Reference
10043-11-5(CAS DataBase Reference)
NIST Chemistry Reference
Boron nitride(10043-11-5)
EPA Substance Registry System
Boron nitride (BN) (10043-11-5)
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Safety Information

Hazard Codes 
Xi
Risk Statements 
36/37
Safety Statements 
26-36
RIDADR 
UN1950
WGK Germany 
3
RTECS 
ED7800000
TSCA 
Yes
HS Code 
2850 00 20
HazardClass 
2.1
Toxicity
LD50 orally in Rabbit: > 2000 mg/kg LD50 dermal Rat > 2000 mg/kg

MSDS

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Boron nitride Usage And Synthesis

Description

Boron nitride is a material in which the extra electron of nitrogen (with respect to carbon) enables it to form structures that are isoelectronic with carbon allotropes.

Chemical Properties

white powder(s), 1μm or less 99.5% pure; hexagonal, most common form: a=0.2504 nm, c=0.6661nm; fcc: a=0.3615nm; hardness: hexagonal like graphite,?cub approaches that of diamond; band gap ~7.5 eV at 300K; dielectric 7.1; used in furnace insulation and in crucibles for melting aluminum, boron, iron, and silicon, also as sputtering target for dielectrics, diffusion masks, passivation layers [KIR81] [HAW93] [MER06] [CER91]

Physical properties

White powder, hexagonal graphite-like form or cubic crystal; cubic form similar to diamond in its crystal structure, and reverts to graphite form when heated above 1,700°C; density 2.18 g/cm3; melts at 2,975°C (under nitrogen pressure); sublimes at 2,500°C at atmospheric pressure; insoluble in water and acid; attacked by hot alkalies and fused alkali carbonates; not wetted by most molten metals or glasses.

Uses

Boron nitride is a material in which the extra electron of nitrogen (with respect to carbon) enables it to form structures that are isoelectronic with carbon allotropes. Also used in manufacture of alloys; in semiconductors, nuclear reactors, lubricants.

Uses

boron nitride is a synthetically manufactured white, talc-like powder that can reflect light, giving a product a sparkle effect. It is primarily used in color cosmetics to provide subtle shimmer; however, it can also be found in skin care formulations for enhancing product smoothness and slip.

Definition

boron nitride: A solid, BN, insolublein cold water and slowly decomposedby hot water; r.d. 2.25 (hexagonal);sublimes above 3000°C. Boronnitride is manufactured by heatingboron oxide to 800°C on an acid-solublecarrier, such as calcium phosphate,in the presence of nitrogen orammonia. It is isoelectronic with carbonand, like carbon, it has a veryhard cubic form (borazon) and asofter hexagonal form; unlikegraphite this is a nonconductor. It isused in the electrical industrieswhere its high thermal conductivityand high resistance are of especialvalue.

Preparation

Boron nitride is prepared by heating boric oxide with ammonia:
B2O3 + 2NH3 → 2BN + 3H2O
Alternatively, the compound can be prepared by heating boric oxide or boric acid with ammonium chloride or an alkali metal cyanide. Purified product can be obtained by high temperature reaction of boron halide with ammonia:
BCl3 + NH3 → BN + 3HCl
Boron nitride can also be made from the elements by heating boron and nitrogen at red heat.

Production Methods

In tonnage production, acetaldehyde may be manufactured by:
1. The direct oxidation of ethylene, requiring a catalytic solution of copper chloride plus small quantities of palladium chloride Cl2Pd.
2. The oxidation of ethyl alcohol C2H6O with sodium dichromate Cr2Na2O7, and
3. The dry distillation of calcium acetate C4H6CaO4 with calcium formate C2H2CaO4.

Industrial uses

Boron nitride (BN) has many potential commercial applications. It is a white, fluffy powder with a greasy feel. It is used for heat-resistant parts by molding and pressing the powder without a binder to a specific gravity of 2.1 to 2.25.
BN may be prepared in a variety of ways, for example, by the reaction of boron oxide with ammonia, alkali cyanides, and ammonium chloride, or of boron halides and ammonia. The usually high chemical and thermal stability, combined with the high electrical resistance of BN, suggests numerous uses for this compound in the field of high-temperature technology. BN can be hot-pressed into molds and worked into desired shapes.
BN powders can be used as mold-release agents, high-temperature lubricants, and additives in oils, rubbers, and epoxies to improve thermal conductance of dielectric compounds. Powders also are used in metal- and ceramicmatrix composites (MMC and CMC) to improve thermal shock and to modify wetting characteristics.
The platy habit of the particles and the fact that boron nitride is not wet by glass favors use of the powder as a mold wash, e.g., in the fabrication of high-tension insulators. It is also useful as thermal insulation in induction heating. A cubic form of boron nitride (Borazon) similar to diamond in hardness and structure has been synthesized by the high-temperature, high-pressure process for making synthetic diamonds. Any uses it may find as a substitute for diamonds will depend on its greatly superior oxidation resistance.

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Nanjing XFNano Material Tech Co., Ltd Gold
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