Matches 51 - 100 out of 231 < 1 2 3 4 5 >


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6406677 Methods for low and ambient temperature preparation of precursors of compounds of group III metals and group V elements  
Processes are provided for preparation of precursors of Group III-V compounds, i.e., nitrides, phosphides, arsenides, antimonides and bismuthides of boron, aluminum, gallium and indium. The...
6383465 Cubic boron nitride and its gas phase synthesis method  
Cubic boron nitride which is obtained from a gas phase without using an ultra-high pressure and which distinctly shows, in the Raman spectrum, either characteristic scattering by phonon of an...
6348179 Spherical boron nitride process, system and product of manufacture  
The present invention involves a process and system for producing spherical BNxOy particles that are converted to crystalline BN. The process involves adding a boron compound to an aqueous...
6319602 Boron nitride and process for preparing the same  
The present invention provides a polycrystalline hexagonal boron nitride compound comprising fine crystals of the order of nanometers.The present invention also provides a hexagonal boron nitride...
6306358 Crystalline turbostratic boron nitride powder and method for producing same  
Turbostratic boron nitride (t-BN) powder having excellent sinterability. A mixture of boric acid anhydride and urea is charged in a reaction vessel together with alkali-borate, heated step by step...
6299805 Boron nitride sealing element  
A sealing member is produced from form-pressed boron nitride powder, while adding an inorganic or organic binding agent. Such boron nitride powder is obtained during the machining of boron nitride...
6277348 Preparation of mesophasic polyborazylene mesophasic polyborazylene and use as a BN precursor  
The present invention relates to: a novel process for the preparation of mesophasic polyborazylene. Said process is of particular value in that it affords a quality product from an appropriate...
6231980 BX CY NZ nanotubes and nanoparticles  
The invention provides crystalline nanoscale particles and tubes made from a variety of stoichiometries of Bx Cy Nz where x, y, and z indicate a relative amount of each element compared to the...
6160042 Surface treated boron nitride for forming a low viscosity high thermal conductivity polymer based boron nitride composition and method  
A low viscosity high thermal conductivity polymer-based boron nitride composition and a surface-treated boron nitride material for use as a filler in this composition, and methods of preparation...
6127510 Carbodiimide polymers as precursors for C/N and B/C/N materials  
PCT No. PCT/EP98/00584 Sec. 371 Date Aug. 10, 1999 Sec. 102(e) Date Aug. 10, 1999 PCT Filed Feb. 4, 1998 PCT Pub. No. WO98/35921 PCT Pub. Date Aug. 20, 1998Novel C/N- and B/C/N polymers which can...
6120748 Process for rapid solid-state formation of refractory nitrides  
A process for forming high quality crystalline refractory materials, particularly gallium (Ill) nitride (GaN), from solid precursors. By blending dry reactants in an oxygen and moisture free...
6071841 Cubic boron nitride sintered body and method of preparing the same  
A cubic boron nitride sintered body has sufficient strength, hardness, heat resistance and heat dissipativity for serving as a cutting tool. A method of preparing a cubic boron nitride sintered...
6048511 Method for forming high density boron nitride and high density agglomerated boron nitride particles  
A method of forming pellets or agglomerates of high density boron nitride from high purity hexagonal boron nitride by crushing the high purity hexagonal boron nitride into boron nitride particles...
RE36492 Method for producing cubic boron nitride  
hBN is converted to cBN by keeping it under temperature and pressure conditions within the range of stability of cubic boron nitride, in the presence of a mixture of at least two compounds...
5985228 Method for controlling the particle size distribution in the production of multicrystalline cubic boron nitride  
A method is provided wherein hexagonal boron nitride particulates are converted directly into cubic boron nitride particles or agglomerated masses which can be easily milled to the desired size...
5898009 High density agglomerated boron nitride particles  
A method of forming pellets or agglomerates of high density boron nitride from high purity hexagonal boron nitride by crushing the high purity hexagonal boron nitride into boron nitride particles...
5869015 Method for producing cubic boron nitride using melamine as a catalyst  
An improved process for converting hexagonal boron nitride (HBN) particles into cubic boron nitride (CBN) in a high pressure/high temperature apparatus (HP/HT) is disclosed. More specifically, by...
5854155 Hexagonal system boron nitride powder  
Melamine borate particles each consisting essentially of needle crystal primary particles of melamine borate (C3 N6 H6.2H3 BO3) which are aggregated to one another.
5693581 Method of manufacturing a pyrolytic boron nitride compact  
In accordance with the present invention a pyrolytic boron nitride compact having an electrical resistivity smaller than about 1014 Ω-cm is formed by the process of introducing a feed gas of...
5602062 Method for preparing a boron nitride composite  
A method for preparing a boron nitride composite, which comprises heating a molten mixture of urea, boric acid and a metal element compound to obtain boron nitride having the metal element or the...
5549731 Preparation of solid aggregates of high density boron nitride crystals  
Method and apparatus for compaction of powder of high density boron nitride, having an initial particle diameter of at least two microns, into a high density crystal aggregate of between 1 mm up...
5541144 Process for preparing an amorphous ultrahard material on the basis of boron nitride  
A process for preparing amorphous ultrahard material based on boron nitride which has a hardness sufficient to scratch diamond uses hexagonal or turbostratic boron nitride hBN as starting...
5525320 Process for aluminum nitride powder production  
Processes for the direct manufacture of nitride powders suitable for low temperature sintering are provided. An elemental vapor is contacted with a nitriding gas at temperatures between 1400 and...
5505928 Preparation of III-V semiconductor nanocrystals  
Nanometer-scale crystals of III-V semiconductors are disclosed, They are prepared by reacting a group III metal source with a group V anion source in a liquid phase at elevated temperature in the...
5443605 Polycrystalline cubic boron nitride abrasive  
A polycrystalline cubic boron nitride abrasive is provided wherein a mean size of each primary crystal grain forming the abrasive is not more than 1.0 μm and a standard deviation thereof is not...
5404836 Method and apparatus for continuous controlled production of single crystal whiskers  
Described herein is a method and apparatus for continuously growing single crystal whiskers of silicon carbide, silicon nitride, boron carbide and boron nitride by the VLS process under controlled...
5399377 Borazine oligomers and composite materials including boron nitride and methods of making the same  
Borazine oligomers in liquid form are produced and used to create composites of fibers bonded to boron nitride as a matrix and also to coat or increase the density of various fiber composites.
5352430 Method of manufacturing intercalation compounds  
A method of manufacturing an intercalation compound, such as a graphite intercalation compound, in a fluidized bed reactor. The intercalation compound comprises a host material, like graphite, and...
5352429 Dynamic compaction processing system  
Carbonaceous material embedded within an explosive charge, is subjected to ressure and temperature conditions during detonation of the charge at a supervelocity modified to obtain a compaction...
5334339 Boron nitride sinter and process for its production  
The present invention relates to a high-strength BN single sinter or a high-strength composite sinter consisting of BN and other ceramics, and a process for its production. The present invention...
5262140 Process for producing an alkaline earth metal borate dispersion  
A process for producing an alkaline earth metal borate dispersion, comprising the two steps of: (1) reacting a mixture of (A) an oil-soluble alkaline earth metal salt, (B) an alkaline earth metal...
5256394 Radiological imaging method, and contrast media reagents therefor  
A method of imaging a corporeal situs by radiological techniques, comprising delivery to the corporeal situs of an imagingly effectively amount of a physiologically acceptable composition...
5240691 High density crystalline boron prepared by hot isostatic pressing in refractory metal containers  
Boron powder is hot isostatically pressed in a refractory metal container to produce a solid boron monolith with a bulk density at least 2.22 g/cc and up to or greater than 2.34 g/cc. The...
5230873 Process for producing amorphous boron nitride of high hardness  
A boron nitride, of amorphous structure, which can scratch diamond, is produced from hexagonal or turbostratic boron nitride as starting material. In the process for the production of the...
5204295 Precursors for boron nitride coatings  
The disclosure is directed to compositions and methods for forming boron nitride coatings, using polymers derived from tri-substituted borazine and chloroborazine compounds. The polymeric...
5200372 Method for production of high-pressure phase sintered article of boron nitride for use in cutting tool and sintered article produced by the method  
A sintered article is produced by mixing an intermetallic compound (binding phase) composed of at least one member selected from among carbides, nitrides, and borides of the elements of Groups 4a,...
5182149 Boron nitride boat and process for producing it  
A pyrolytic boron nitride boat having a cavity suitable for use in growing and doping semi-conductor crystals such as gallium arsenide and said cavity having a roughened surface formed of...
5178844 Method and apparatus for producing nitride products  
A method and apparatus are provided for producing a product comprising a nitride compound, such as for example silicon nitride. A reactor is provided which has a chamber defined therein which is...
5169613 Method for the preparation of boron nitride using ammonia-monohaloborane  
The invention relates to the synthesis of ammonia-haloboranes, and in particular, H3 NBH2 Cl, which materials are useful for the produciton of amorphous boron nitride and crystalline turbostratic...
5147623 Fabrication method of cubic boron nitride  
A process for preparing large granules of cubic boron nitride from hexagonal boron nitride, which comprises using a binary alloy of Al-Mg as a catalyst under high temperature and pressure wherein...
5139591 Laser deposition of crystalline boron nitride films  
Thin films of boron nitride are grown on single crystal silicon substrates using laser deposition techniques. The films are characterized by essentially a single crystal throughout and having a...
5130549 Method of detecting or measuring nuclear radiation  
Cubic boron nitride having an impurity profile as set out below has been found to exhibit excellent thermoluminescent properties with a high gamma radiation sensitivity and low light sensitivity:...
5126168 Preparation of group IIIA-VA compounds such as boron nitride, and of boron nitride films and coatings  
Lewis base-borane complexes such as (CH3)2 S.BHBr2 are utilized as molecular precursors for the formation of both bulk powders, films and coatings of boron nitride. The complexes are subjected to...
5108966 Process for producing wurtzitic or cubic boron nitride  
Disclosed is a process for producing wurtzitic or cubic boron nitride comprising the steps of: [A] preparing an intimate mixture of powdered boron oxide, a powdered metal selected from the group...
5100845 Process for producing titanium diboride and boron nitride powders  
A process for the simultaneous production of titanium diboride and boron nitride powders using a single reaction procedure in which the raw materials of the TiB2 reaction and the BN reaction are...
5064589 Method for producing high density hexagonal boron nitride sintered article  
A method for producing a high density boron nitride sintered body includes mixing high purity hexagonal boron nitride powder with 0.1 to 20% by weight of at least one alkaline earth metal, then...
5063184 Pressureless sintered body of boron nitride  
A pressureless sintered body of boron nitride contains more than 95 wt% of boron nitride. The pressureless sintered body hexagonal of boron nitride has a density of not less than 1.10 g/cm3 and a...
5061469 Process for producing shaped boron nitride product  
A process for the production of boron nitride is carried out by condensing a mixture of a B-tris-(loweralkylamino)borazine with an alkylamine in an inert gas atmosphere at a temperature of 150° C....
5053365 Method for the low temperature preparation of amorphous boron nitride using alkali metal and haloborazines  
The invention relates to an energy efficient method for the production of boron nitride materials at temperatures of from about 100 degrees to about 230 degrees Centigrade. The boron nitride...
5021371 Low carbon/high purity boron nitride  
Highly pure boron nitride ceramic material, devoid of silicon values and having low carbon content, is prepared by pyrolyzing, under an atmosphere of ammonia, the product of the reaction between...

Matches 51 - 100 out of 231 < 1 2 3 4 5 >