Matches 151 - 200 out of 231 < 1 2 3 4 5 >


Match Document Document Title
4349517 Method of producing cubic boron nitride  
Disclosed is a method of producing cubic boron nitride, which comprises the steps of subjecting to a pressure of from 40 to 70 kilobars and to a temperature of from 1100° to 2000° C. a charge...
4287164 Process for producing cubic system boron nitride  
A process for producing cubic system boron nitride comprises contacting calcium or strontium boron nitride with hexagonal system boron nitride and heating at higher than 1,450° C. under the...
4284610 BN Bonded BN fiber article and method of manufacture  
A boron nitride bonded boron nitride fiber article and the method for its manufacture which comprises forming a shaped article with a composition comprising a bonding compound selected from boron...
4231980 Large boron nitride abrasive particles  
Hard boron nitride particles of wurtzite and zincblende crystal structure of larger than 50 microns particle size are formed by subjecting recrystallized pyrolytic boron nitride to dynamic shock...
4188194 Direct conversion process for making cubic boron nitride from pyrolytic boron nitride  
A process for making a sintered polycrystalline cubic boron nitride (CBN) compact by direct conversion of a pyrolytic, preferably substrate nucleated, boron nitride (PBN). Direct conversion takes...
4150098 Method of producing cubic boron nitride  
A method of producing cubic boron nitride is proposed which consists in that hexagonal boron nitride is subjected simultaneously to the action of a pressure of from about 50 kbar to about 90 kbar...
4148863 Method of preparing polycrystalline cubic boron nitride  
According to the invention, a method of preparing polycrystalline cubic bn nitride resides in that hexagonal boron nitride is subjected to the action of pressure of 40-90 kbar and temperature of...
4132554 Method for producing a sintered compact of boron nitride with high density form  
A sintered compact of boron nitride with high density form having high oxidation resistance, water resistance, compressive strength and hardness can be obtained by sintering wurtzite-structured...
4107276 Manufacture of hexagonal boron nitride  
Process for the manufacture of hexagonal boron nitride which comprises causing a starting material containing an alkali metal boride or an alkaline earth metal boride, preferably a hexa- or...
4096297 Isotropic boron nitride and method of making same  
The invention disclosed herein relates to a body of substantially pure isotropic boron nitride in which individual anisotropic crystals of boron nitride are substantially randomly oriented and...
4089931 Purification of boron nitride  
Boron nitride (BN) is freed of boric oxide without increasing its electroconductivity by heating the BN under vacuum to evaporate the boric oxide and chlorinating the BN at a temperature...
4064225 Method for producing hydrogen or deuterium from storable solid propellant compositions based on complex metal boron compounds  
Disclosed are storable solid propellant compositions based on complex metal oron compounds of the general formula M(BH4)x or M(BD4)x, (where M equals a metal and x equals the valence of the metal...
4045186 Method for producing large soft hexagonal boron nitride particles  
Soft hexagonal boron nitride crystals of 200-600 microns platelet size are produced from crystals of less than fifty microns particle size by mixing the small crystals with Li3 N, simultaneously...
4016244 Process for production of cubic boron nitride  
In synthesizing cubic boron nitride from hexagonal boron nitride under high temperature and high pressure conditions, if water is incorporated into the raw material in an amount of at least 3% by...
4014979 Method of producing wurtzite-like boron nitride  
A powder of boron nitride having a graphite structure is mixed with cooling additives having a shock impedance different from that of the boron nitride having a wurtzite structure being formed....
3979500 Preparation of finely-divided refractory powders of groups III-V metal borides, carbides, nitrides, silicides and sulfides  
The preparation of metal and metalloid carbides, borides, nitrides silicides and sulfides by reaction in the vapor phase of the corresponding vaporous metal halide, e.g., metal chloride, with a...
3959443 Method of synthesizing cubic crystal structure boron nitride  
A method of synthesizing cubic crystal structure boron nitride from hexagonal crystal structure boron nitride or other boron compound by subjecting the boron nitride or boron compound to a...
3918219 Catalyst systems for synthesis of cubic boron nitride  
Certain aluminum alloys have been found to be effective catalysts for the synthesis of cubic boron nitride from hexagonal boron nitride. Nickel/aluminum and cobalt/aluminum alloys in particular...
3876751 METHOD FOR PRODUCING POLYCRYSTALLINE BORON NITRIDE  
A mixture containing less than 50 wt. percent of graphite-like boron nitride treated by a shock wave and highly defective wurtzite-like boron nitride obtained by a shock-wave method is compressed...
3868234 Metal-bonded cubic boron nitride crystal body  
Cubic boron nitride crystals have been bonded together into an abrasive body with an alloy bonding medium. The preparation of this abrasive body includes selection of an alloy (using separate...
3806584 PROCESS FOR PRODUCING CARBON-FREE, SATURATED BORON-NITROGEN-HYDROGEN COMPOUNDS  
A process for producing carbon-free, saturated boron-nitrogen-hydrogen compounds of the empirical formula BN3-x H6-3, where 0 x < 2, from boron compounds and ammonia, which comprises reacting...
3769160 NEUTRON ABSORBERS  
The use of nitrogen as a neutron absorber is applied by employing silicon nitride in a foamed or high density form. Materials having neutron absorption cross-sections higher than silicon nitride...
3768972 METHOD OF PRODUCING CUBIC BORON NITRIDE WITH ALUMINUM CONTAINING CATALYST  
An improved method for converting boron nitride from the hexagonal to the cubic form in which powdered hexagonal boron nitride is mixed with at least one catalyst selected from the group...
3718490 PROCESS FOR PURIFICATION OF REFRACTORY METAL NITRIDES  
Carbon is removed from refractory metal nitrides, such as aluminum nitride, by heating the impure nitride with boric oxide in an atmosphere of nitrogen at a temperature of about 1,200 °-2050° C....
3711594 PROCESS FOR MAKING BORON NITRIDE BODIES  
Process for making highly pure detrition-resistant boron nitride pressed ies from a boron-nitrogen-hydrogen compound having the general basic empirical formula BN3-x H6-x, Where the value of x is...
3668059 HIGH MODULUS BORON NITRIDE FIBERS  
Boric oxide fibers having a maximum diameter of about 10 microns are heated in an ammonia atmosphere under such conditions as to produce partially nitrided fibers consisting essentially of B, N, O...
3661521 REFINING OF CUBIC BORON NITRIDE  
Cubic boron nitride is refined from a mixture of cubic boron nitride and hexagonal boron nitride by adding to the mixture lithium hydroxide, sodium hydroxide, or potassium hydroxide, or mixtures...
3660027 HIGH PURITY HOT PRESSED BORON NITRIDE  
High purity boron nitride articles of manufacture having a high density and improved properties. The improved boron nitride articles have a unique acicular crystal structure, an oxygen content of...
3607042 PREPARATION OF BORON NITRIDE  
Boron nitride is produced by nitriding boric acid or boric oxide in the presence of a support phase which is a chemically reducible metal compound such as zinc borate or cadmium borate. The...
3701826 CUBIC BORON NITRIDE PREPARATION FROM LITHIUM-BORON-NITROGEN MIXTURES  
3565702 DEPOSITING SUCCESSIVE EPITAXIAL SEMICONDUCTIVE LAYERS FROM THE LIQUID PHASE  
3667911 METHOD OF TREATING SOLIDS WITH HIGH DYNAMIC PRESSURE  
3825440 VAPOR DEPOSITION METHOD  
3734997 HIGH PURITY HOT PRESSED BORON NITRIDE  
3692474 PREPARATION OF METAL NITRIDES  
3561920 CHEMICAL VAPOR DEPOSITION OF THICK DEPOSITS OF ISOTROPIC BORON NITRIDE  
3772428 CONTINUOUS GROWTH OF CUBIC BORON NITRIDE  
3692566 METHOD OF DEPOSITING ISOTROPIC BORON NITRIDE  
3837997 BORON NITRIDE PRODUCTS  
3473894 PREPARATION OF HEXAGONAL BORON NITRIDE  
3469941 ULTRAFINE BORON NITRIDE AND PROCESS OF MAKING SAME  
3429722 BORON NITRIDE FIBER MANUFACTURE  
3420629 PRODUCTION OF BORON NITRIDE  
3415625 Preparation of hexagonal boron nitride  
3411882 Production of boron nitride  
3352637 Process and apparatus for the manufacture of nitride powders of the elements aluminum, boron, silicon or zirconium  
3338761 Method and apparatus for making compound materials  
3326820 Arc process for forming high melting point compounds  
3317354 Process for doping a diamond in a gaseous electrical discharge  
3241919 Process for the production of boron nitride  

Matches 151 - 200 out of 231 < 1 2 3 4 5 >