Matches 251 - 300 out of 450 < 1 2 3 4 5 6 7 8 9 >


Match Document Document Title
4803123 Process for production of fibrous carbon material  
A process for production of a fibrous carbon material is described, comprising contacting fibrous silicon carbide with a halogen element or a halogen compound to thereby remove a part or all of...
4795673 Composite material of discontinuous silicon carbide particles and continuous silicon matrix and method of producing same  
Dense, strong, composite materials are produced from mixtures of silicon and silicon carbide. The composite materials are characterized by a mixture of finely-divided silicon carbide in a...
4789536 Process for producing silicon carbide whiskers  
A method of manufacturing silicon carbide whiskers in which silicon and carbon containing feedstock is placed on a series of gas permeable supports and passed through a reaction zone. The...
4789537 Prealloyed catalyst for growing silicon carbide whiskers  
A prealloyed metal catalyst is used to grow silicon carbide whiskers, especially in the β form. Pretreating the metal particles to increase the weight percentages of carbon or silicon or both...
4784839 Method of making metal carbide and nitride powders  
Metal carbide and metal nitride powders produced by the carbothermal reduction of one or more metal oxides reacted with a binder material and a carbonaceous additive or optionally, a binder...
4783516 Polysilane precursors containing olefinic groups for silicon carbide  
This invention is concerned with novel polysilanes containing olefinic groups which are prepared by reactions of halogen-containing organosilane monomers or mixtures thereof with sodium metal in...
4777152 Porous silicon carbide sinter and its production  
A porous silicon carbide sinter and its production process, the sinter consisting mainly of silicon carbide and having a three-dimensional network structure composed mainly of silicon carbide...
4772516 Stable methylpolydisilylazane polymers  
A method for producing methylpolydisilylazane polymers of reduced chloride content that exhibit no increase in pyrophoricity and exhibit improved shelf life. The methylpolydisilylazane polymers of...
4767831 Process for preparing ceramic materials  
A method of preparing ceramic materials or articles by the pyrolysis of preceramic silazane polymers, wherein the preceramic silazane polymers are rendered infusible prior to pyrolysis by...
4752456 Process for preparing metal carbides and precursors thereof  
A carbon-containing mixture is obtained by collecting a dispersed phase mixture from an aerosol which has been formed by introducing a decomposable carbon compound and a decomposable metallic...
4742029 Process for producing a sintered cubic silicon carbide  
A process for producing a normal sintered cubic silicon carbide which comprises sintering cubic silicon carbide powder made up of crystallites of more than 480 Å in size determined from the...
4719095 Production of silicon ceramic powders  
A process for producing silicon ceramic powder, which comprises, oxidizing metallic silicon powder in an oxidizing gas atmosphere into silicon monoxide in the form of ultrafine particles or gas,...
4713360 Novel ceramic materials and methods for making same  
Novel self-supporting ceramic structures are produced by the oxidation reaction of a molten metal precursor with a vapor-phase oxidant to form an oxidation reaction product. Molten metal is drawn...
4707459 Reacting-bonded silicon carbide spheroids and process of making  
A method of producing spheroids comprising a coherent mixture of carbon and silicon carbide powders for subsequent siliconizing and if desired grinding to improve their sphericity, involves the...
4704444 Polyhydridosilanes and their conversion to pyropolymers  
A polyhydridosilane has a catenated silicon backbone of 9 to 4000 silicon atoms with an average number of hydrogen atoms per silicon atom in the range of 0.3 to 2.2, at least 0.1 gram of the...
4702900 Method of producing silicon carbide  
In a method of producing silicon carbide by heating starting materials comprising siliceous material and carbonaceous material in a non-oxidizing atmosphere, those ingredients contained in gases...
4702901 Process for growing silicon carbide whiskers by undercooling  
A method of growing silicon carbide whiskers, especially in the β form, using a heating schedule wherein the temperature of the atmosphere in the growth zone of a furnace is first heated to or...
4701426 Silicon carbide-graphite composite material  
A silicon carbide-graphite composite material is disclosed. The composite material includes graphite as a secondary phase which is segregated along the grain boundaries of all the silicon carbide...
4692418 Sintered silicon carbide/carbon composite ceramic body having fine microstructure  
Sintered silicon carbide/carbon composite ceramic body having a homogeneous very fine grain microstructure with at least 50 percent of its silicon carbide grains having a size not exceeding about...
4690811 Process for preparing silicon carbide whiskers  
The present invention provides a process for preparing silicon carbide whiskers. According to the process, carbon black having the following properties (a) to (c) is blended, as a carbonaceous...
4689252 Polysilazane composition which can crosslink in the presence of a metal compound catalyzing a hydrosilylation reaction  
A crosslinkable composition comprising at least one polysilazane containing at least 2, preferably at least 3, .tbd.SiH groups per molecule and at least 2 SiR2 groups per molecule, R2 being an...
4687657 Fabrication of SiC - AlN alloys  
An aluminum nitride ceramic is formed by pyrolyzing a poly-N-alkyliminoalane. A ceramic comprising a solid solution of silicon carbide and aluminum nitride is also formed by mixing a preceramic...
4676940 Plasma arc sintering of silicon carbide  
A process for the sintering of silicon carbide refractory or ceramic articles using plasma arc gases. In the process of the invention, a formed silicon carbide article is heated in a plasma fired...
4676966 Method for the preparation of a fine powder of silicon carbide  
The invention provides a novel method for the preparation of a finely divided powder of silicon carbide as a promising material for sintered ceramic products of silicon carbide. The method...
4663105 Method of producing silicon carbide base sintered material containing boron as sintering assistant  
In producing a SiC base sintered material containing a small amount of B as a sintering assistant, a boron-containing organic compound obtained by reaction between a boron compound and an...
4659022 Production of silicon carbide with automatic separation of a high grade fraction  
Method of producing silicon carbide and of automatically separating a high grade fraction thereof using magnetic separation techniques. In the method of the invention, a silicon source, a carbon...
4649002 System for preventing decomposition of silicon carbide articles during sintering  
A system to prevent, retard or reverse the decomposition of silicon carbide articles during high temperature plasma sintering. Preferably, the system comprises sintering a silicon carbide...
4640830 Process for preparing fine fibers  
A process for preparing fine fibers (or whiskers) consisting of carbon and silicon is disclosed, in which a mixed gas of transition metal compound(s), organo-silicon compound(s) and optionally...
4637924 Continuous silicon carbide whisker production  
The invention features methods and apparatus for obtaining silicon carbide whiskers on a continuous basis. Rice hulls or other carbon and silicon containing feed materials are continuously fed to...
4631179 Process for the production of silicon carbide by the pyrolysis of a polycarbosilane polymer  
Silicon carbide production by pyrolysis of polycarbosilane polymers formed by prior art methods is fraught with defects. These can be obviated by utilizing as the polycarbosilane polymer, a...
4627945 Method of manufacturing an injection molded refractory shape and composition thereof  
An alumina-carbon shape is manufactured from a composition comprising 1-8 weight percent fine silicon, 1-16 weight percent reactive alumina, 1-30 weight percent calcined fluidized bed coke, 1-30...
4624735 Constituent members of a semiconductor element-manufacturing apparatus and a reaction furnace for making said constituent members  
The constituent members of a semiconductor element-manufacturing apparatus which are formed by depositing a silicon carbide layer on a carbon substrate, and wherein a peak X-ray diffraction on the...
4608242 Hydrosilyl-modified polycarbosilane precursors for silicon carbide  
A novel branched hydrosilyl-modified polycarbosilane which can be pyrolized to obtain improved yields of silicon carbide. This novel branched hydrosilyl-modified polycarbosilane can be prepared in...
4606902 Process for preparing refractory borides and carbides  
Refractory borides or carbides are prepared by contacting an alkali-metal ducible metal chloride or silicon tetrachloride with boron trichloride or carbon tetrachloride in an inert solvent in the...
4605542 Process for producing silicon carbide whisker  
Disclosed is a process for producing silicon carbide whisker by mixing a silicon source with carbon black and subjecting the resultant mixture to heating treatment in an inert atmosphere, which...
4604367 Method for the preparation of an inorganic fiber containing silicon, carbon, boron and nitrogen  
The invention provides a novel inorganic fiber composed of the elements of silicon, carbon, boron and nitrogen of which the Si/B molar ratio is 2:1 to 200:1. The inorganic fiber is obtained by a...
4597923 Production of reaction-bonded silicon carbide bodies  
The production of a reaction-bonded silicon carbide artefact by siliconizing a green body comprising a coherent mixture of carbon and silicon carbide particles includes the step of forming a layer...
4594330 Fine amorphous powder and process for preparing fine powdery mixture of silicon nitride and silicon carbide  
Fine spherical amorphous powder represented by the general formula: SiCxNyHzwherein 0.1
4591492 Method of manufacturing crystalline silicon carbide employing acid pretreated rice husks  
A method of manufacturing silicon carbide crystals in which a rice husk raw material is pretreated with an acid solution (e.g., 5N to 6N H2 SO4, HCl or HNO3) prior to being heated in a furnace of...
4571331 Ultrafine powder of silicon carbide, a method for the preparation thereof and a sintered body therefrom  
The invention provides a method for the preparation of an ultrafine powder of silicon carbide having an extremely fine and uniform particle size distribution of spherical agglomerate particles...
4565744 Wettable coating for reinforcement particles of metal matrix composite  
Metal matrix composite materials are formed from a reinforcing, submicron-particle material, such as SiC, which is not easily wettable by a matrix metal, such as Al, and therefore cannot be...
4564496 Method of making porous silicon carbide bodies  
Porous silicon carbide bodies are obtained by starting with a powder of particle size falling within a single sieve mesh range fraction and consisting either entirely of carbon particles or a...
4556416 Process and apparatus for manufacturing fine powder  
A process and an apparatus for manufacturing a fine powder of metals or ceramics are proposed in which a mixed gas of volatile metal compound and/or evaporated metal and a reaction gas is reacted...
4556436 Method of preparing single crystalline cubic silicon carbide layers  
A method of making very pure cubic silicon carbide, SiC, comprising the steps of: loading a first inner graphite cup of a Lely type furnace while cold with a large number of crystals of SiC that...
4552740 Process for producing amorphous and crystalline silicon nitride  
A process for producing amorphous or crystalline silicon nitride is disclosed which comprises reacting silicon disulfide ammonia gas at elevated temperature. In a preferred embodiment silicon...
4543240 Method for the continuous production of carbides  
One aspect of the present invention relates to methods for the continuous production of silicon carbide and other carbide and refractory products by fluidized bed techniques, the apparatus for...
4536379 Production of silicon carbide  
A process for the manufacture of silicon carbide crystals and whiskers comprises reacting at a temperature between 1,400° C. and 2,100° C. and in the presence of an inert gas, a material including...
4534948 Method for preparing silicon carbide  
What is disclosed is an improved method of preparing silicon carbide which is characterized by the preparation of a specific pre-silicon carbide polymer. The method allows the preparation of...
4529575 Process for producing ultrafine silicon carbide powder  
A process for producing an ultrafine silicon carbide powder by passing a granulated blend of silica powder, carbon powder and a carbonaceous binder downwardly through a vertical indirect heating...
4517305 Finely divided silicon carbide having a high content of 2H-type silicon carbide and method of producing the same  
Finely divided silicon carbide containing at least 10% by weight of 2H-type silicon carbide is very easily sinterable and can be sintered into a sintered body having a density of at least 85% of...

Matches 251 - 300 out of 450 < 1 2 3 4 5 6 7 8 9 >