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Topic: Boron nitride


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In the News (Sun 21 Jul 19)

  
 Boron - CreationWiki   (Site not responding. Last check: 2007-09-17)
Boron's chemical symbol is B, it's atomic number is 5, and it occurs naturally as 80% B11 and 20% B10.
Boron is found in minerals or compounds such as borax, boric acid, colemanite, kernite, ulexite and borates.
Boron has many potantial uses to the medical world and is currently being researched in boron neutron capture therapy and drug delivery, and it also shows great promise in treating arthritis.
creationwiki.org /Boron   (1226 words)

  
 Boron Nitride Aerosol
Boron nitride is electrically insulating to its use-limits, while being transparent (non-heating/non-absorbing) to microwave energy and having a dielectric strength about four times that of aluminum oxide.
Major uses for boron nitride arise from its stability and compete lack of attack and total non-wetting in contact with molten aluminum, magnesium, zinc, and other nonferrous metals and alloys.
The lubricity of boron nitride is remarkable throughout its useful temperature range and in all environments (unlike graphite which loses its lubricity in vacuum): this property of BN leads to its uses in areas of metal extrusion, plastic extrusion, hot-pressing of metals and ceramics, and isothermal (superplastic) forming of superalloys.
www.bnaerosol.com   (446 words)

  
 MedlinePlus Herbs and Supplements: Boron
Boron should be avoided in patients who have a history of reactions to boron, boric acid, borax, citrate, aspartate, or glycinate.
Boron is potentially toxic, although humans tend not to accumulate high levels of boron due to the ability to rapidly excrete it.
Boron may be associated with reduced blood levels of calcitonin, insulin, or phosphorus, and with increased levels of vitamin D2, calcium, copper, magnesium, or thyroxine.
www.nlm.nih.gov /medlineplus/druginfo/natural/patient-boron.html   (1944 words)

  
 Boron - Diet Index - dietlist.net
Boron being an essential micronutrient, playing notably a role in plant fertilisation and in the building of cell wall structures, it is used in agriculture.
Boron filaments are high-strength, lightweight materials that are chiefly used for advanced aerospace structures as a component of composite materials.
Boron compounds are being investigated for use in a broad range of applications, including as components in sugar-permeable membranes, carbohydrate sensors and bioconjugates.
www.dietlist.net /boron.html   (1378 words)

  
 Boron Minerals,Boron Information,Boron Properties,Boron Uses,Boron Exporters
The element boron was identified in 1808 by Sir Humphrey Davy of England, and Joseph-Louis Gay-Lussac and Louis Jacques Thenard of France.
Boron is used in agriculture as it plays a notable role in plant fertilisation and in building of cell wall structures.
Boron filaments for its high-strength and lightweight property is used in advanced aerospace structures as a component of composite materials.
www.mineralszone.com /minerals/boron.html   (498 words)

  
 Boron Nitride - Properties & Applications and Supplier of Boron Nitride,
Boron Nitride is an advanced synthetic ceramic material available in powder, solid, liquid and aerosol spray forms.
Boron Nitride is a binary chemical compound, consisting of equal proportions of boron and nitrogen, with composition BN.
Boron is the chemical element in the periodic table that has the symbol B and atomic number 5.
www.precision-ceramics.co.uk /boron_nitride.htm   (372 words)

  
 Boron Nitride (BN) - Properties and Information on Boron Nitride
Boron and nitrogen are neighbours of carbon in the periodic table - in combination boron and nitrogen have the same number of outer shell electrons - the atomic radii of boron and nitrogen are similar to that of carbon.
It is not surprising therefore that boron nitride and carbon exhibit similarity in their crystal structure.
The synthesis of hexagonal boron nitride powder is achieved by nitridation or ammonalysis of boric oxide at elevated temperature.
www.azom.com /details.asp?ArticleID=78   (708 words)

  
 C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - BORON
Boron nitride is as hard as diamond and similar in structure.
Boron is used in fission-reactor control rods to capture neutrons and regulate the power produced.
Preparing boron equivalents of the hydrocarbons was technically difficult, and their structures turned out to be surprisingly complex compared to their carbon cousins.
pubs.acs.org /cen/80th/print/boron.html   (887 words)

  
 Boron Nitride Nanotubes (BNNT) from READE   (Site not responding. Last check: 2007-09-17)
boron nitride nanotubes, BNNT, boron nitride fullerenes, buckyballs, BN nanotubes, BN fullerenes, boron nitride nanotubes, boron nitride fullerenes, buckyballs, BN nanotubes, BN fullerenes
Boron nitride (BN) nanotubes have the same atomic structure as carbon nanotubes but many interesting properties including a more stable electronic property and better resistance to oxidation at high temperatures.
boron nitride nanotubes, boron nitride fullerenes, BN nanotubes, BN fullerenes, boron nitride nanotubes, boron nitride fullerenes, BN nanotubes, BN fullerenes
www.reade.com /Products/Nanomaterials/boron-nitride-nanotubes.html   (212 words)

  
 Cubic boron nitride preparation utilizing nitrogen gas - Patent 4412899
In order to have the nitrogen gas function to form cubic boron nitride, it is necessary to have a plasma present during the deposition process and an electrically negative bias must be impressed on the substrate.
Either pure boron or an alloy consisting essentially of 0.1 weight percent to 5.0 weight percent of at least one of the elements chromium, nickel, cobalt, or manganese, the balance being boron may be used as the metals source.
If desired, an alloy consisting of at least 60 percent by weight to the balance of boron with from two to 12 percent by weight of aluminum, and at least 0.2 to 24 percent by weight of at least one of cobalt, nickel, manganese or other aluminide-forming element may be utilized as a metals source.
www.freepatentsonline.com /4412899.html   (2012 words)

  
 boron
Boron compounds have been known for thousands of years, but the element was not discovered until 1808 by Sir Humphry Davy and by Gay-Lussac and Thenard.
High-purity crystalline boron may be prepared by the vapor phase reduction of boron trichloride or tribromide with hydrogen on electrically heated filaments.
Boron is similar to carbon in that it has a capacity to form stable covalently bonded molecular networks.
www.speclab.com /elements/boron.htm   (958 words)

  
 [No title]
Boron nitride is a white solid material in the as produced hot pressed form.
The isotope boron-10 is used as a control for nuclear reactors, as a shield for nuclear radiation, and in instruments used for detecting neutrons.
Boron nitride has remarkable properties and can be used to make a material as hard as diamond.
www.lycos.com /info/boron--boron-nitride.html   (172 words)

  
 Boron - Wikipedia, the free encyclopedia
Several allotropes of boron exist; amorphous boron is a brown powder, though crystalline boron is fl, hard (9.3 on Mohs' scale), and a weak conductor at room temperature.
The highly pure boron, for the use in semiconductor industry, is produced by the decomposition of diborane at high temperatures and then further purified with the Czochralski process.
Boron has to be transferred to pussy acid or pussys and on reaction with curcumin in acidic solution a red colored boron-chelate complex - rosocyanine - is formed.
en.wikipedia.org /wiki/Boron   (2215 words)

  
 BORON NITRIDE POWDER
BORON NITRIDE can be added to plastics, potting compounds, oils, greases and other materials to provide enhanced thermal conductivity and dielectric strength.
As a dry-film lubricant, boron nitride powders can be incorporated to eliminate squeaks and noise and to lubricate during forming processes, reduce sticking and act as a release agent in molding, casting and forming operations.
As a ceramic material, the uses for boron nitride are unmatched.
bnpowder.com   (68 words)

  
 New on the nanoscale: buckyball wires sheathed with boron nitride insulation
The inside diameter of a boron nitride tube determines the configuration of the carbon buckyballs packed inside it: (a) in a 2-nanometer tube, the buckyballs are staggered; (b) in a 2.8-nanometer tube, the buckyballs assemble as rotating triangles; (c) at a diameter of 3.3 nanometers, the buckyball nanowire is shaped like a corkscrew
Zettl and his group made their boron nitride nanotubes using a plasma arc technique, developed earlier in Zettl's laboratory, in which a hot electrical discharge is sent between two boron-rich electrodes in a chamber filled with pure nitrogen gas.
In addition to creating insulated carbon nanowires, Zettl says that boron nitride silos can serve as model systems for studying the mechanical, electronic, thermal, and magnetic properties of "dimensionally-constrained" configurations of densely packed molecules such as buckyballs, a critical need for the development of nanotechnology.
www.lbl.gov /Science-Articles/Archive/MSD-nano-insulation.html   (523 words)

  
 Boron nitride
One of the most well-known characteristics of hexagonal boron nitride is the very bad wettability by metal melts (like Al, Mg, Zn, Pb and Cu), slags as well as salt melts.
Boron nitride is stable at air to approx.
Cubic boron nitride, also called borazon, is a hard material of high microhardness and used for grinding applications.
www.a-m.de /englisch/lexikon/bornitrid.htm   (263 words)

  
 Boron Nitride Nanotubes More Amenable Than Carbon
However, different from their carbon analogues, boron nitride nanotubes are wide-gap semiconductors with a quasiparticle band gap of about 5.5 eV.
Boron nitride is far more resistant to oxidation than carbon and therefore suited for high temperature applications in which carbon nanostructures would burn.
The range of applications (e.g., in optoelectronic devices) of these boron nitride nano-tubes would be greatly extended if their band gap can be tuned to desired values in a controlled way.
www.physorg.com /news92.html   (891 words)

  
 Boron nitride
Boron nitride is a synthetic material that's available in several forms, including powder, solid, liquid, and aerosol spray.
Most types of glass will not stick to boron nitride; as a result, the liquid and aerosol forms can be used in kiln-forming as a release on slumping molds.
Boron nitride aerosol sprays can be used straight out of the can, and no mixing or diluting is necessary.
www.warmtips.com /20051007.htm   (278 words)

  
 Boron Nitride Polymers: new building blocks for organic electronic devices
We propose that boron nitride polymers with the same structure as organic polymers will allow the same idea to be applied to polymer materials, already recognised as a cheap alternative to inorganic semiconductors.
We demonstrate the similarity between organic polymers and their boron nitride analogues and then explore the potential innovations, including band gap tuning, that these new polymers could bring to organic polymer research.
Since in those structures, two carbon atoms are replaced by one boron and one nitrogen atom, it is worth investigating whether this substitution is also possible in organic polymers.
www.tcm.phy.cam.ac.uk /~pdh1001/papers/paper7   (2690 words)

  
 Cerflon
Additionally, since Boron Nitride is, by itself, an excellent lubricating agent, it appears that the fluoropolymer acts as a binder to keep both the fluoropolymer and the Boron Nitride at surfaces that require boundary lubrication.
Boron Nitride is the only material known to fully wet certain fluoropolymers, in particular, PTFE also known by the DuPont registered trademark Teflon®.
Boron Nitride reinforcement also assures that the electrical properties and the reactivity of the composite remain unchanged regardless of the amount of filler applied.
www.cerflon.com /index.htm   (299 words)

  
 Boron Nitride Products: Wurtzite Boron Nitride (WBN)
It is the next step in the boron nitride generation which includes a well-known superabrasive - cubic boron nitride, as well as, a graphite similar in structure - hexagonal boron nitride.
Wurtzite Boron Nitride with plate shape particles is used as a raw material for sintering coarse grit polycrystalline structure powders, which are later used for manufacturing traditional cutting and grinding tools.
Wurtzite Boron Nitride with regular crystal shape particles is the perfect material for steel polishing applications, such as, molds, dies, etc.
www.ukabrasives.com /products/products8.html   (209 words)

  
 Boron Nitride (BN) Paints
Boron Nitride Lubricoat-ZV (WHITE or BLUE-COLORED) is offered where a more dilutable coating is desired and for applications requiring a relatively hard surface -- such as components that move while in contact with molten metal.
Boron Nitride Hardcoat is ideal for ladles, skimmers, and areas needing some abrasion-resistance.
Boron nitride specialty coatings for the extrusion [products manufactured by ZYP Coatings for Castool]and glass industry are offered.
www.zypbn.com   (273 words)

  
 C&EN: NEWS OF THE WEEK - BORON NITRIDE NANOTUBES FORMED
Occasional four- and eight-membered rings cause boron nitride nanotubes to bend and adopt a variety of shapes (red = boron; blue = nitrogen).
"Boron nitride has important advantages over carbon," asserts Laurence D. Marks, a professor of materials science and engineering.
They find that the tiny structures are composed of rolled-up sheets that consist mainly of hexagons of boron and nitrogen with occasional four- and eight-membered rings that allow the tubes to bend and endow them with characteristic shapes.
pubs.acs.org /cen/topstory/7912/7912notw1.html   (497 words)

  
 Boron Nitride Nanotubes - New Technology
However, since ordered boron nitride also crystallizes in a graphite-like structure yet has electronic properties significantly different from graphite, considerable interest has developed in nanotubes with this composition.
Boron nitride nanotubes with high yield have been produced by annealing under carefully controlled furnace conditions.
Boron nitride nanotubes have been observed growing from tungsten-metal particles.
www.azonano.com /details.asp?ArticleID=197   (297 words)

  
 Boron Nitride Coating resists non-ferrous metals., Aremco Products, Inc.
Pyro-Paint™ 634-BN, a new high temperature, non-wetting, boron nitride filled coating developed bv Aremco Products, Inc., is now used to protect metal and refractory surfaces from corrosion by molten glasses, metals, plastics and salts in applications to 1560 °F (850 °C).
Pyro-Paint™ 634-BN is a single part, odorless, water-dispersible, boron nitride filled, high temperature coating, formulated to resist molten metals, glasses, plastics and salts in applications to 1560 °F (850 04C).
It is formulated with a solids content of 46.4% by weight, resulting in a dry film of greater than 95% boron nitride and a coverage rate of 800 ft²/gal assuming a lmil dry film thickness.
news.thomasnet.com /fullstory/452078   (839 words)

  
 Method of synthesizing cubic boron nitride films (US6153061)
A method of forming cubic phase boron nitride films in which a hexagonal boron nitride film target is positioned in front of an RF magnetron sputtering gun and is impacted with ions to cause atoms of boron and nitrogen to be sputtered away from the target and toward a substrate.
The electrons cause the boron and nitrogen atoms to be reformed on the substrate as cubic phase boron nitride while suppressing the formation of other, less desirable forms of boron nitride films.
Preparation of cubic boron nitride film by activated reactive evaporation with a gas activation nozzle, K. Inagawa, et al, J. Vac.
www.delphion.com /details?pn=US06153061__   (623 words)

  
 Compact Boron Nitride
The classical summary equation when boron sesquioxide with carbon gives boron nitride and carbon monoxide is being often used in literature, but the process itself is not that simple.
The main difference between the PLS and HP processes is that in the latter the material is trapped in-between the pressing rams and the inner wall of the matrix.
The thermally released water is thus forced to decompose boron nitride.
hubacek.jp /bn/bn.htm   (2650 words)

  
 Boron nitride   (Site not responding. Last check: 2007-09-17)
Boron nitride is a binary chemical compound, consisting of equal proportions of boron and nitrogen, with formula BN.
It is widely used for grinding and as material for tools in industry, partly because it does not dissolve into iron, nickel and related alloys at high temperatures, but diamond does.
Hexagonal Boron nitride finds use as a high-temperature lubricant where the electrical conductivity or reactivity of graphite would be problematic.
boron-nitride.iqnaut.net   (165 words)

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