Boron Nitride Powder (BN) & Boron Nitride Spray from READE

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Boron Nitride Synonyms:

Boron nitride powder, Boron nitride aerosol spray, Boron nitride plate, White graphite, Cubic boron nitride, c-BN, Wurtzite boron nitride, Amorphous boron nitride, a-BN, Hexagonal BN, h-BN, BN powder, BN plate, BN aerosol spray, PBN, Polyboron nitride, Boron(III) nitride, Borazon, CAS # 10043-11-5, Kubonit, Wurzin, Geksanit R, Hexanite R, Bornitrid, Boron mononitride, Hexanit R, Super mighty M, Kubonit KR, Elbor, Elboron, Elbor R, Nitrure de bore, Nitruro de boro, Denka GP, Elbor RM, Sho BN,

Boron Nitride Formula:

BN

Boron Nitride Description:

a) Boron nitride is a chemical compound with chemical formula BN, consisting of equal numbers of boron and nitrogen atoms. BN is isoelectronic to a similarly structured carbon lattice and thus exist in various crystalline forms. The hexagonal form corresponding to graphite is the most stable and softest among BN polymorphs, and is therefore used as lubricant and an additive to cosmetic products. The cubic (sphalerite structure) variety analogous to diamond is called c-BN. Its hardness is inferior only to diamond, but its thermal and chemical stability is superior. The rare wurtzite BN modification is similar to lonsdaleite and may even be harder than the cubic form. Source: Wikipedia

b) Boron nitride is not found in nature and is therefore produced synthetically from boric acid or boron trioxide. The initial product is amorphous BN powder, which is converted to crystalline h-BN by heating in nitrogen flow at temperatures above 1500 °C. c-BN is made by annealing h-BN powder at higher temperatures, under pressures above 5 GPa. Contrary to diamond, larger c-BN pellets can be produced by fusing (sintering) relatively cheap c-BN powders. As a result, c-BN is widely used in mechanical applications. Source: Wikipedia

c) Same crystal structure as graphite; low density; high thermal conductivity; low electrical conductivity; excellent temperature & lubricating stability. Now available as cubic BN or wurtzite BN. Wurtzite BN is manufactured by detonation and has a polycrystalline structure Source: Wikipedia

Boron Nitride Typical Chemical Properties Available:

a) Various grades with B + N contents between 86.0% min. to 90.0% min.

b) Cosmetic grade (97% min.; Mean Particle Size= 0.5 microns)

Boron Nitride Typical Physical Properties Available:

BN nanotubes, sintered pieces, targets, rod, aerosol spray can, and various powder granulations

Boron Nitride Nominal Physical Constants:

Molecular Weight (g/mol.)
24.82

Bulk Density (g/cm3)
~0.4

Tap Density (g/cm3)
~0.6-0.7

Melting Point (°C) (decomposed)
2500- 3000

Surface Area (m2/g) (Cosmetic grade)
20

Thermal Conductivity (W/cm·K)
~60

Mohs Hardness @20°C
~2

Color
White

Coefficient of Thermal Expansion (20-1000 deg.C)
7.51

Crystallography
Hexagonal

Boron Nitride Typical Applications:

a) Hexagonal BN (h-BN)

Ceramic BN crucibleHexagonal BN is the most widely used polymorph. It is a good lubricant at both low and high temperatures (up to 900 °C, even in an oxidizing atmosphere). h-BN lubricant is particularly useful when the electrical conductivity or chemical reactivity of graphite (alternative lubricant) would be problematic. Another advantage of h-BN over graphite is that its lubricity does not require water or gas molecules trapped between the layers. Therefore, h-BN lubricants can be used even in vacuum, e.g. in space applications. The lubricating properties of fine-grained h-BN are used in cosmetics, paints, dental cements, and pencil leads.

Hexagonal BN was first used in cosmetics around 1940 in Japan. However, because of its high price, h-BN was soon abandoned for this application . Its use was revitalized in the late 1990s with the optimization h-BN production processes, and currently h-BN is used by nearly all leading producers of cosmetic products for foundations, make-up, eye shadows, blushers, kohl pencils, lipsticks and other skincare products.

Because of its excellent thermal and chemical stability, boron nitride ceramics are traditionally used as parts of high-temperature equipment. h-BN can be included in ceramics, alloys, resins, plastics, rubbers, and other materials, giving them self-lubricating properties. Such materials are suitable for construction of e.g. bearings and in steelmaking. Plastics filled with BN have less thermal expansion, higher thermal conductivity and electrical resistivity. Due to its excellent dielectric and thermal properties, BN is used in electronics e.g. as a substrate for semiconductors, microwave-transparent windows, structural material for seals.

Hexagonal BN is used in xerographic process and laser printers as a charge leakage barrier layer of the photo drum. In the automotive industry, h-BN mixed with a binder (boron oxide) is used for sealing oxygen sensors, which provide feedback for adjusting fuel flow. The binder utilizes the unique temperature stability and insulating properties of h-BN. Source: Wikipedia

b) Cubic boron nitride (c-BN)

i) Cubic boron nitride is widely used as an abrasive. Its usefulness arises from its insolubility in iron, nickel, and related alloys at high temperatures, whereas diamond is soluble in these metals to give carbides. Polycrystalline c-BN abrasives are therefore used for machining steel, whereas diamond abrasives are preferred for aluminum alloys, ceramics, and stone. When in contact with oxygen at high temperatures, BN forms a passivation layer of boron oxide. Boron nitride binds well with metals, due to formation of interlayers of metal borides or nitrides. Materials with cubic boron nitride crystals are often used in the tool bits of cutting tools. For grinding applications, softer binders, e.g. resin, porous ceramics, and soft metals, are used. Ceramic binders can be used as well. Commercial products are known under names "Borazon", and "Elbor" or "Cubonite". Similar to diamond, the combination in c-BN of highest thermal conductivity and electrical resistivity is ideal for heat spreaders. Contrary to diamond, large c-BN pellets can be produced in a simple process (called sintering) of annealing c-BN powders in nitrogen flow at temperatures slightly below the BN decomposition temperature. This ability of c-BN and h-BN powders to fuse allows cheap production of large BN parts. As cubic boron nitride consists of light atoms and is very robust chemically and mechanically, it is one of the popular materials for X-ray membranes: low mass results in small X-ray absorption, and good mechanical properties allow usage of thin membranes, thus further reducing the absorption. Source: Wikipedia

ii) Technology coupled with R&D activity is enabling new product innovation as well as identification of emerging applications. New processing and fabrication technologies such as microwave plasma, jet plasma, interactive laser technique, and fullerenes based production of nanocrystalline diamond films are changing the dynamics for diamond and diamond composites. Materials like Cubic Boron Nitride (CBN), the world’s second hardest material after diamond, are witnessing growth due to their distinct properties. CBN possesses the highest thermal conductivity amongst all materials, in addition to high electrical resistance and very low thermal expansion. Razor blades, tools/wear-resistant parts, and print/record heads and hard disk coatings, commanding a lion’s share of the diamond and diamond-like films & coatings market, are the three major end-use market segments.

iii) Latest tools and technologies are being used in the engineering sector for cutting and machining applications. Tools, which were earlier making use of hard materials such as diamond, are now using substitute materials such as cubic boron nitride (CBN) and polycrystalline boron nitride (PCBN). Industries such as automotive, heavy industry, and aerospace are the largest consumers of CBN and PCBN inserts. These materials, which are better suited than diamond in applications involving very high temperatures, deliver better results at lower costs. CBN is a widely used abrasive with numerous applications in the manufacturing industries. Earlier limited to just working with hard steels, the material is now used extensively in all applications that involve cutting, grinding, and machining. Source: Global Industry Analysts (GIA)

c) Amorphous boron nitride (a-BN)

Layers of amorphous boron nitride (a-BN) are used in some semiconductor devices, e.g. MISFETs. They can be prepared by chemical decomposition of trichloroborazine with cesium, or by thermal chemical vapor deposition methods. Thermal CVD can be also used for deposition of h-BN layers, or at high temperatures, c-BN. Source: Wikipedia