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Boron nitride

CAS No.
10043-11-5
Chemical Name:
Boron nitride
Synonyms
Boron nitrite;Hexagonal boron nitride;BNNT;Nitriloboron;boron mononi;Cubic Boron nitride;BORON NITRIDE NANOTUBE;Boron nitride,hexagonal;Boron nitride nanopowder, APS 5-20nm;BN C
CBNumber:
CB9266197
Molecular Formula:
BN
Lewis structure
bn lewis structure
Molecular Weight:
24.82
MDL Number:
MFCD00011317
MOL File:
10043-11-5.mol
MSDS File:
SDS
Last updated:2024-01-17 16:13:14

Boron nitride Properties

Melting point 2700℃
Boiling point sublimes sl below 3000℃ [MER06]
Density 0.9-1.1 g/mL at 25 °C
storage temp. no restrictions.
solubility insoluble in H2O, acid solutions
form Powder
Specific Gravity 3.48
color White
PH 5-8 (100g/l, H2O, 20℃)(slurry)
Resistivity 10*19 (ρ/μΩ.cm)
Water Solubility Soluble in water (slightly soluble) at 20°C, and water (soluble) at 95°C.
Sensitive Hygroscopic
Crystal Structure Hexagonal
Merck 14,1346
Stability Stable. Incompatible with oxidizing agents, water.
CAS DataBase Reference 10043-11-5(CAS DataBase Reference)
EWG's Food Scores 1
FDA UNII 2U4T60A6YD
NIST Chemistry Reference Boron nitride(10043-11-5)
EPA Substance Registry System Boron nitride (BN) (10043-11-5)

SAFETY

Risk and Safety Statements

Symbol(GHS)  GHS hazard pictogramsGHS hazard pictogramsGHS hazard pictograms
GHS02,GHS05,GHS07
Signal word  Danger
Hazard statements  H226-H315-H318-H335
Precautionary statements  P210-P233-P240-P280-P303+P361+P353-P305+P351+P338
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

Boron nitride price More Price(84)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich GF92332100 Boron nitride sheet, size 25 × 25?mm, thickness 4.0?mm, condition hot-pressed 10043-11-5 1EA $587 2024-03-01 Buy
Sigma-Aldrich GF70504602 Boron nitride rod, length 200 mm, 20?mm diameter, condition hot-pressed 10043-11-5 1EA $1680 2024-03-01 Buy
Sigma-Aldrich GF54207503 Boron nitride sheet, thickness 2.0?mm, size 25 × 25?mm, condition hot-pressed 10043-11-5 1EA $391 2024-03-01 Buy
Sigma-Aldrich GF43305498 Boron nitride rod, 9.0?mm diameter, length 100 mm, condition hot-pressed 10043-11-5 1EA $532 2024-03-01 Buy
Sigma-Aldrich GF43107678 Boron nitride rod, 12.7?mm diameter, length 200 mm, condition hot-pressed 10043-11-5 1EA $997 2024-03-01 Buy
Product number Packaging Price Buy
GF92332100 1EA $587 Buy
GF70504602 1EA $1680 Buy
GF54207503 1EA $391 Buy
GF43305498 1EA $532 Buy
GF43107678 1EA $997 Buy

Boron nitride Chemical Properties,Uses,Production

Industrial Preparation

Cubic BN, or borazon, is produced by subjecting hexagonal BN to extreme pressure and heat in a process similar to that used to produce synthetic diamonds. Melting of either phase is possible only with a high nitrogen overpressure. The alpha-phase decomposes above 2700°C at atmospheric pressure and at ca. 1980°C in a vacuum.
Hexagonal BN is manufactured using hot pressing or pyrolytic deposition techniques. These processes cause orientation of the hexagonal crystals, resulting in varying degrees of anisotropy. There is one pyrolytic technique that forms a random crystal orientation and an isotropic body; however, the density reaches only 50 to 60% of the theoretical density. Both manufacturing processes yield high purity, usually greater than 99 wt.% BN. The major impurity in the hot-pressed materials is boric oxide, which tends to hydrolyze in the presence of water, degrading the dielectric and thermal-shock properties of the material. The addition of calcia reduces the water absorption. Hexagonal hot-pressed BN is available in a variety of sizes and shapes, while the pyrolytic hexagonal material is currently available in thin layers only.

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.
Boron nitride is an inorganic compound with a flat, hexagonal crystal similar to graphite, but with the carbon atoms replaced by boron and nitrogen atoms. The alternate boron and nitrogen atoms are linked to form interlocking hexagonal rings with three boron atoms and three nitrogen atoms, and the layers are held together by van der Waals forces. There is no boron-nitrogen bonding between the layers.The bond length is 1.466Å and the interlayer spacing is 3.331 Å. A spherical form (with a hexagonal crystal structure) is also available.
Hexagonal boron nitride
Boron nitride can also be in cubic form in which alternately linked boron and nitrogen atoms form a tetrahedral bond network, similar to carbon atoms in diamond.
Cubic boron nitride

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

Insulator (Eg=7.5 eV). Crucibles for melting molten metals such as Na, B, Fe, Ni, Al, Si, Cu, Mg, Zn, In, Bi, Rb, Cd, Ge, and Sn. Corroded by molten metals U, Pt, V, Ce, Be, Mo, Mn, Cr, V, and Al. Attacked by molten salts PbO2, Sb2O3, AsO3, Bi2O3, KOH, and K2CO3. Used in furnace insulation-diffusion masks and passivation layers.

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.
Cubic boron nitride (c-BN) does not exist in nature but it is a novel substance created by human. It is synthesized under high pressure and high temperature just like diamond counterpart and has the wurzite crystal structure. The tables below compare reference hardness and heat conductivity for a couple of abrasive materials. Apparently c-BN is excellent in these properties, second only to diamond, the highest.

Substance Hardness VHN (Vickers) Heat Conductivity (W/(m.K))
diamond 8600 1000 - 2000
c-BN 5000 590
alumina 2300 6
tungsten carbide 1800 42
silicon carbide 800 85
titanium nitride 2100 7.4
titanium carbide 3000 5.2
www.tomeidiamond.co.jp

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.

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.
Hexagonal boron nitride can be used as an electrical insulator; as thermocouple protection sheaths, crucibles and linings for reaction vessels; and as a coating for refractory molds used in glass forming and in superplastic forming of titanium. It can also be incorporated in ceramics, alloys, resins, plastics, and rubber to give them self-lubricating properties. Hexagonal boron nitride is used the formulation of coatings and paints for high temperature applications. It is also used as a substrate for semi-conductors, lens coatings, and transparent windows.
https://www.cir-safety.org

Uses

Boron nitride used in the manufacture of high-temperature equipment parts due to its excellent thermal and chemical stability. It is used as a lubricant and an additive to cosmetics, paints, dental cements and pencil leads. It is also used to provide self lubricating properties to ceramics, alloys, resins, plastics and rubbers. In addition to this, it has many industrial applications such as xerographic process, laser printers, oxygen sensors and proton conductors. Cubic boron nitride is used as an abrasive material.

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.

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.

Application

Boron nitride finds applications in shaping tools in industries due to its ability to withstand temperatures greater than 2,000°C. Cutting tools and abrasive components, designed specifically for use with low-carbon ferrous metals, have been developed using cubic boron nitride. These tools perform similarly to polycrystalline diamond (PCD) tools but can be utilized on iron and low-carbon alloys without the risk of a reaction occurring.

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.

General Description

Boron nitride in cubic form, known as Borazon, is a manufactured abrasive that was discovered by General Electric Co. Laboratories in 1957. Unlike manufactured diamond, Borazon does not have a natural counterpart. It is produced under temperatures and pressures similar to those required for diamond manufacture. Additionally, cubic boron nitride exhibits greater thermal stability compared to diamond. It remains stable at temperatures exceeding 1,371°C, while diamond reverts to graphite at temperatures above 816°C. Borazon has a Knoop hardness (K100) of 7800, which is higher than ordinary abrasives but lower than diamond.

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.

Industrial uses

The major industrial applications of hexagonal boron nitride rely on its high thermal conductivity, excellent dielectric properties, self-lubrication, chemical inertness, nontoxicity, and ease of machining. These are, for instance, mold wash for releasing molds, high-temperature lubricants, insulating filler material in composite materials, as an additive in silicone oils and synthetic resins, as filler for tubular heaters, and in neutron absorbers. On the other hand, the industrial applications of cubic boron nitride rely on its high hardness and are mainly as abrasives.

Forms and nomenclature

Boron nitride exists as three different poly-morphs:
Alpha-boron nitride (α-BN), a soft and ductile polymorph (ρ = 2280 kg.m–3 and m.p. = 2700°C) with a hexagonal crystal lattice similar to that of graphite, also called hexagonal boron nitride (HBN) or white graphite;
Beta-boron nitride (β-BN), the hardest manmade material and densest polymorph (ρ = 3480 kg.m–3, m.p. = 3027°C), with a cubic crystal lattice similar to that of diamond, also called cubic boron nitride (CBN) or borazon;
Pyrolitic boron nitride (PBN). From a chemical point of view, boron nitride oxidizes readily in air at temperatures above 1100°C, forming a thing protective layer of boric acid (H3BO3) on its surface that prevents further oxidation as long as it coats the material. Boron nitride is stable in reducing atmospheres up to 1500°C.

7664-41-7
11113-50-1
10043-11-5
Synthesis of Boron nitride from Ammonia and Boric acid
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Boron nitride pictures 2024-02-22 Boron nitride
10043-11-5
US $1.00 / kg 1kg 99% 20000tons Hubei Langyou International Trading Co., Ltd
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Boron nitride Spectrum

Boron nitride sputtering target, 25.4mm (1.0in) dia x 3.18mm (0.125in) thick, 99.99% (metals basis e Boron nitride, Aerosol Refractory Paint, 97+%, (balance B2O3) Boron Nitride (Metals Basis) BORON NITRIDE 25 G BORON NITRIDE 50 G BN Nanoplates Boron Nitride dispersion BN B50 BN C BN F15 BN A01 BORON NITRIDE BORON NITRIDE ROD bn40shp borazon boronmononitride boronnitride(bn) bzn550 denkaboronnitridegp denkagp elbor elborlo10b1-100 elboron elborr elborrm geksanitr hexaniter hexanitr kbn-h10 kubonit kubonitkr shobn shobnhps sp1(nitride) supermightym uhp-ex wurzin Boronnitrideoffwhitepowder BN F15 BORON NITRIDE GRADE F15 - A PRODUCT OF H.C. STARCK BN B50 BORON NITRIDE GRADE B 50 - A PRODUCT OF H.C. STARCK BN A01 BORON NITRIDE GRADE A 01 - A PRODUCT OF H.C. STARCK BN C - BORON NITRIDE GRADE C - A PRODUCT OF H.C. STARCK LUBRIFORM BN 10 LUBRIFORM BN 15 BORON NITRIDE, POWDER, CA. 1 MICRON, 98% BoronNitride(Lab) BORON NITRIDE SERIES PRODUCTS BY HIGH TEMPERATURE AND PRESSURE Boronnitride,99+% boron nitride, low binder Boron nitride, 99.5% (metals basis) Boron nitride sputtering target, 25.4mm (1.0in) dia x 3.18mm (0.125in) thick, 99.99% (metals basis excluding Ca) Boron nitride, low binder, 99.5% (metals basis) Boron nitride, Aerosol Refractory Paint, 97+%, (balance B2O3) boron nitride hexagonal and cubic Boron nitride nanotube, purified Boron nitride nanotube, standard grade Cubic Nitride Boron Nanoplates with High Purity Boron nitride powder, ~1 MuM, 98%