Abstract:
PROBLEM TO BE SOLVED: To provide a thermally conductive filler material which can be used at high fill levels to achieve sufficient thermal conductivity without increasing viscosity. SOLUTION: There is provided a spherical boron nitride powder including the spherical agglomerates of boron nitride platelets preferably having an average agglomerate size of from 10 to 500 microns. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide densified silicon nitride.SOLUTION: The densified silicon nitride body can be formed using a lanthana-based sintering aid (lanthanum, neodymium) and an aluminum compound-based sintering aid. A composition by mixing the silicon nitride with the sintering aid can be densified by sintering and hot isostatic pressing at the sintering temperature of 1,750°C.
Abstract:
PROBLEM TO BE SOLVED: To provide a ceramic body having inclusions of lubricating material, and method of forming the same. SOLUTION: A ceramic component comprises a sintered ceramic body formed from a composition containing a first ceramic material, and a plurality of inclusions in the ceramic body, each inclusion comprising graphite and a second ceramic material. Various techniques for forming ceramic bodies, and in particular, lubricious and/or graphite-containing ceramic bodies are also provided, as well as ceramic bodies formed thereby. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide thermally conductive filler materials which can be used at high fill levels to achieve sufficient thermal conductivity without increasing viscosity. SOLUTION: The present invention relates to a method of producing a spherical boron nitride powder and a method of producing a hexagonal boron nitride paste using a hexagonal boron nitride slurry. Another aspect of the present invention relates to a hexagonal boron nitride paste including about 60-about 80 wt.% solid hexagonal boron nitride. Yet another aspect of the present invention relates to a spherical boron nitride powder, a polymer blend including a polymer and the spherical boron nitride powder, and a system including such a polymer blend. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
An article including a monolithic crucible body comprising silicon oxynitride (SixNyO, wherein x>0 and y>0), wherein the silicon oxynitride extends throughout the entire volume of the monolithic crucible body.
Abstract:
A method of forming a sintered boron carbide body includes washing boron carbide powder with essentially pure water at an elevated temperature to generate low oxygen boron carbide powder, mixing a sintering aid and a pressing aid with the low oxygen boron carbide powder to form a green mixture, and shaping the green mixture into a green boron carbide body. The method can include mixing titanium carbide powder having an average particle diameter in a range of between about 5 nm and about 100 nm with the low oxygen boron carbide powder. The method can further include sintering the green boron carbide body, and hot isostatic pressing the sintered body, to a density greater than about 98.5% of the theoretical density (TD) of boron carbide. Alternatively, the method can include sintering the shaped boron carbide green body at a temperature greater than about 2,200 0C, to thereby form a eutectic liquid solid solution of B4C/SiC, forming a sintered boron carbide body with a density greater than about 98% TD.
Abstract:
A porous sintered silicon carbide body that includes silicon carbide and graphite and methods of making thereof are described. The porous silicon carbide body can be a seal. The porous sintered silicon carbide body defines pores with an average pore size in a range of between about 20 µm and about 40 µm, comprising a porosity in a range of between about 1% and about 5% by volume.
Abstract:
A method of forming a sintered silicon carbide body includes mixing silicon carbide powder having an oxygen content of less than about 3 wt% and having a surface area in a range of between about 8 m /g and about 15 m /g, with boron carbide powder and carbon sintering aid to form a green silicon carbide body. Alternatively, a method of producing a sintered silicon carbide body includes mixing the silicon carbide powder with titanium carbide powder having an average particle diameter in a range of between about 5 nm and about 100 nm and with carbon sintering aid to form a green silicon carbide body. In another alternative, a method of forming a sintered silicon carbide body includes mixing silicon carbide powder with boron carbide powder, the titanium carbide powder, and carbon sintering aid to form a green silicon carbide body. After sintering, the silicon carbide bodies have a density at least 98% of the theoretical density of silicon carbide.
Abstract:
In a method of preparing a boron carbide material, boron carbide powder is washed with essentially pure water at an elevated temperature to generate washed boron carbide powder. The washed boron carbide powder is combined with a sintering aid. The mixture of the boron carbide powder and the sintering aid is pressed to form a shaped material, and the shaped material is sintered. A sintered boron carbide material comprises a boron carbide component that includes boron carbide, elemental carbon, and not more than about 0.6 wt% of oxygen on the basis of the total weight of the boron carbide component. The sintered boron carbide material has a density of at least about 99% of the theoretical density. Another sintered boron carbide material comprises a boron carbide component that includes boron carbide, silicon carbide, elemental carbon, and not more than about 0.3 wt% oxygen on the basis of the total weight of the boron carbide component, and has a density of at least about 97% of the theoretical density.
Abstract:
In a method of preparing a boron carbide material, boron carbide powder is washed with essentially pure water at an elevated temperature to generate washed boron carbide powder. The washed boron carbide powder is combined with a sintering aid. The mixture of the boron carbide powder and the sintering aid is pressed to form a shaped material, and the shaped material is sintered. A sintered boron carbide material comprises a boron carbide component that includes boron carbide, elemental carbon, and not more than about 0.6 wt% of oxygen on the basis of the total weight of the boron carbide component. The sintered boron carbide material has a density of at least about 99% of the theoretical density. Another sintered boron carbide material comprises a boron carbide component that includes boron carbide, silicon carbide, elemental carbon, and not more than about 0.3 wt% oxygen on the basis of the total weight of the boron carbide component, and has a density of at least about 97% of the theoretical density.