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Inventor:
Komatsu; Michiyasu
Address:
Yokohama, JP
No. of patents:
47
Patents:












Patent Number Title Of Patent Date Issued
8133830 Silicon nitride sintered compact and sliding member using the same March 13, 2012
A silicon nitride sintered compact contains silicon nitride grains, and a sintering aid component in a range of 2 to 15 mass %. The silicon nitride grains include needle crystal grains each having a long diameter L of 10 .mu.m or less and a ratio (L/S) of the long diameter L to a short
7662736 High thermally conductive aluminum nitride sintered product February 16, 2010
The high thermal conductive aluminum nitride sintered body according to the present invention has: a thermal conductivity of 220 W/mK or more; and a three point bending strength of 250 MPa or more; wherein a ratio (I.sub.Al.sub.2.sub.Y.sub.4.sub.O.sub.9/I.sub.AlN) of X-ray diffraction
7521388 Wear resistant member comprised of silicon nitride and process for producing the same April 21, 2009
A silicon nitride abrasion resistant member is formed of silicon nitride sintered body containing 2% to 4% by mass of a rare earth element in terms of oxide thereof as a sintering aid, 2% to 6% by mass of an Al component in terms of oxide thereof, and 2% to 7% by mass of silicon carb
7479467 High thermally conductive aluminum nitride sintered product January 20, 2009
The high thermal conductive aluminum nitride sintered body according to the present invention has: a thermal conductivity of 220 W/mK or more; and a three point bending strength of 250 MPa or more; wherein a ratio (I.sub.Al.sub.2.sub.Y.sub.4.sub.O.sub.9/I.sub.AlN) of X-ray diffraction
7192899 Silicon nitride sintered body having high heat conductivity and silicon nitride structural eleme March 20, 2007
A silicon nitride sintered body exhibiting a high heat conductivity, the silicon nitride sintered body includes a rare earth element in an amount of 2 to 17.5 mass % in terms of the oxide thereof, Fe in an amount of 0.07 to 0.5 mass % in terms of the oxide thereof, Ca in an amount of 0.0
7151066 Silicon nitride anti-wear member and process for producing the same December 19, 2006
A silicon nitride wear resistant member is composed of a ceramic sintered body containing 55 to 75 mass % of silicon nitride, 12 to 28 mass % of silicon carbide, 3 to 15 mass % of at least one element selected from the group consisting of Mo, W, Ta, and Nb in terms of silicide thereof, a
6797660 Silicon nitride wear resistant member and manufacturing method thereof September 28, 2004
Wear resistant member comprises a silicon nitride sintered body. Silicon nitride sintered body contains from 75 to 97% by mass of silicon nitride, from 0.2 to 5% by mass of titanium nitride and from 2 to 20% by mass of a grain boundary phase essentially containing Si--R--Al--O--N compoun
6784131 Silicon nitride wear resistant member and method of manufacturing the member August 31, 2004
The present invention provides a silicon nitride wear resistant member composed of silicon nitride sintered body containing 1-10 mass % of rare earth element in terms of oxide thereof as sintering agent, wherein a total oxygen content of the silicon nitride sintered body is 6 mass % or
6642165 Wear resistant member for electronic equipment, and bearing and spindle motor therewith November 4, 2003
Wear resistant member for electronic equipment comprises a silicon nitride sintered body that contains conductivity enhancing particles, and has electrical resistivity in the range from 1 to 10.sup.5 .OMEGA..multidot.m. In silicon nitride sintered body, agglomeration of conductivity enha
6613443 Silicon nitride ceramic substrate, silicon nitride ceramic circuit board using the substrate, an September 2, 2003
The present invention provides a silicon nitride ceramic substrate composed of a silicon nitride sintered body in which maximum size of pore existing in grain boundary phase of the sintered body is 0.3 .mu.m or less, and having a thermal conductivity of 50 W/mK or more and a three point
6475940 Wear resistant member for electronic equipment and bearing and spindle motor therewith November 5, 2002
Wear resistant member for electronic equipment comprises a zirconium oxide sintered body of which specific resistance is in the range from 1 to 10.sup.5 .OMEGA..multidot.m. A conductivity enhancer of which specific resistance is 10.sup.-5 .OMEGA..multidot.m or less is compounded to a
6242374 High thermal conductive silicon nitride sintered body and method of producing the same June 5, 2001
A high thermal conductive silicon nitride sintered body of this invention is characterized by containing: 2.0 to 17.5% by weight of a rare earth element in terms of the amount of an oxide thereof; 0.3 to 3.0% by weight of Mg in terms of the amount of an oxide thereof; if necessary, at mo
6232657 Silicon nitride circuit board and semiconductor module May 15, 2001
There is provided a semiconductor module which comprises a high thermal conductive silicon nitride substrate 10 having a thermal conductivity of 60 w/m.multidot.k or more, a semiconductor element 7 mounted on this high thermal conductive silicon nitride substrate 10, metal circuit plates
6040039 Silicon nitride circuit board March 21, 2000
This invention provides a silicon nitride circuit board in which a metal circuit plate is bonded to a high thermal conductive silicon nitride substrate having a thermal conductivity of not less than 60 W/m K, wherein a thickness D.sub.S of the high thermal conductive silicon nitride
5998000 Silicon nitride circuit board December 7, 1999
This invention provides a silicon nitride circuit board in which a metal circuit plate is bonded to a high thermal conductive silicon nitride substrate having a thermal conductivity of not less than 60 W/m K, wherein a thickness D.sub.s of the high thermal conductive silicon nitride
5928768 Silicon nitride circuit board July 27, 1999
This invention provides a silicon nitride circuit board in which a metal circuit plate is bonded to a high thermal conductive silicon nitride substrate having a thermal conductivity of not less than 60 W/m K, wherein a thickness D.sub.s of the high thermal conductive silicon nitride
5767028 Aluminum nitride sintered body and method for manufacturing the same June 16, 1998
The aluminum nitride sintered body according to the present invention comprises 1-10 % by weight of at least one element selected from a group consisting of a group IIIa element listed in periodic table, Ca, Sr and Ba in terms of the amount of an oxide thereof, 0.2-2.0 % by weight of bor
5763344 Aluminum nitride sintered body and method of manufacturing the same June 9, 1998
The present invention provides an aluminum nitride sintered body made by being sintered at a low temperature of 1650.degree. C. or less comprises 0.5 to 7 wt % of oxide of at least one element selected from Group IIIa elements in the periodic table, 0.5 to 3 wt % of calcium oxide, 1.5 wt
5744410 High thermal conductive silicon nitride sintered body, method of producing the same and press-co April 28, 1998
A high thermal conductive silicon nitride sintered body of this invention is characterized by containing more than 7.5 wt % to at most 17.5 wt % of a rare earth element in terms of the amount of an oxide thereof, if necessary, at most 1.0 wt % of at least one of aluminum nitride and
5698896 High thermal conductive silicon nitride structural member, semiconductor package, heater and the December 16, 1997
A high thermal conductive silicon nitride structural member of the present invention contains a rare earth element in the range of 1.0 to 7.5 wt. % calculated as oxide thereof and Li, Na, K, Fe, Ca, Mg, Sr, Ba, Mn and B as impurity cationic elements in a total amount not greater than 0.3
5635431 Silicon nitride-based sinter June 3, 1997
A silicon nitride-based sinter contains as component elements thereof magnesium in the range of from 0.1 to 1.5% by weight, aluminum in the range of from 0.1 to 3.5% by weight, carbon in the range of from 0.01 to 6% by weight, and oxygen in the range of from 0.2 to 5% by weight, the
5508240 Aluminum nitride sintered body and method for manufacturing the same April 16, 1996
An aluminum nitride sintered body containing 1 to 10% by weight of an oxide of at least one element selected from a group consisting of a group IIIa element, Ca, Sr and Ba, the concentration of a Si component in the sintered body is 0.01 to 0.2% by weight and three-point bending strength
5439856 High thermal conductive silicon nitride sintered body and method of producing the same August 8, 1995
A high thermal conductive silicon nitride sintered body contains: 2.0-7.5% by weight of a rare earth element in terms of the amount of an oxide thereof; at most 0.3% by weight of Li, Na, K, Fe, Ca, Mg, Sr, Ba, Mn and B as impurity cationic elements in terms of total amount thereof; and,
5214009 Sialon containing ceramic sinter May 25, 1993
A ceramic sinter whose mother phase substantially satisfies a sialon composition. This sialon containing ceramic sinter contains at least one kind of compound selected from the group of oxides, carbides, nitrides, and silicides of hafnium, niobium, or titanium in the range of from 0.2 to
5178647 Wear-resistant member January 12, 1993
A wear-resistant member formed comprises a sintered ceramic body essentially consisting of 0.1 to 15% by weight of at least one material selected from the group comprising molybdenum carbide, niobium carbide, hafnium carbide, tantalum carbide, tungsten carbide, molybdenum silicide, n
5112780 Sialon based composite and method of manufacturing the same May 12, 1992
A sialon based composite composite essentially consists of 5 wt % to 40 wt % of SiC fibers, 0.3 wt % to 10 wt % of an Hf component which is calculated in terms of Hf oxide, and the balance of sialon as a major constituent. In this case, the sialon is .alpha.-sialon or .beta.-sialon.
5098872 Wear-resistant member March 24, 1992
A wear-resistant member consisting of ceramics containing yttrium oxide and aluminum oxide as a sintering auxiliary component and further titanium oxide, hafnium oxide and aluminum nitride, and mainly formed of silicon nitride. Silicon nitride ceramics possesses the segregation of amorph
4911870 Method for production of sintered silicon nitride article March 27, 1990
A method for the production of a silicon nitride ceramics exhibiting high mechanical strength at elevated temperature is disclosed. This production is effected by a method which comprises preparing a mixture of silicon dioxide with excess carbon as a silicon nitride material for the sili
4902653 Silicon nitride ceramic article February 20, 1990
A sintered silicon nitride ceramic article excelling in high-temperature strength and experiencing only an insignificant decline of strength at elevated temperatures particularly up to 1,300.degree. C. is produced by firing a ceramic mixture composed of not more than 10% by weight of the
4879263 Sliding member of high strength and high abrasion resistance November 7, 1989
A sliding member formed of sintered silicon nitride shows improvement in strength and abrasion resistance when substantially all the .beta.-phase type fine silicon nitride particles present as a main component in the sintered silicon nitride have major diameters not exceeding 60 .mu.m an
4761339 Sintered ceramic articles and method for production thereof August 2, 1988
Sintered ceramic articles and a method for the production thereof are disclosed. When a shaped Si.sub.3 N.sub.4 ceramic article is sintered in the presence of SiO.sub.2 or a SiO.sub.2 -containing substance in an inactive gas atmosphere, there is obtained a sintered ceramic article ha
4713302 Sintered ceramic body December 15, 1987
A sintered ceramic body has a surface layer containing yttrium silicate, cristobalite and silicon nitride, and mainly consists of silicon nitride. The silicon ceramic body is manufactured by preparing a composition containing a silicon nitride powder and an yttrium oxide powder, forming
4693857 Method for production of sintered article of silicon nitride September 15, 1987
As the aluminum nitride component of a sintering aid for powdered silicon nitride, either a spinel type compound having oxygen dissolved in aluminum nitride to form a solid solution or a poly-type aluminum nitride is used. Since the compound is highly stable in water, it can be effective
4671912 Method of manufacturing sintered ceramic body June 9, 1987
A sintered ceramic body is manufactured first by preparing a composition containing a binder and a ceramic powder having a particle size distribution given such that 0 to 1 weight % of ceramic particles with a particle size of less than 0.2 .mu.m, 0 to 2 weight % of ceramic particles
4511525 Process for producing sintered silicon nitride-base body April 16, 1985
Disclosed is a process for producing a sintered silicon nitride-base body, which comprises; mixing powder (A) of heat-treated or not heat-treated silicon nitride powder and powder (B) of powder obtained by heat-treating a powdery mixture of silicon nitride powder and a sintering additive
4412009 Sintered Si.sub.3 N.sub.4 body October 25, 1983
Disclosed is a method of producing a sintered body of ceramics, wherein a powder mixture consisting, essentially of at most 10%, exclusive of 0%, by weight of yttrium oxide, at most 10%, exclusive of 0%, by weight of aluminum oxide, at most 10%, exclusive of 0%, by weight of aluminum
4407971 Sintered body of silicon nitride-based ceramics October 4, 1983
There are disclosed a sintered body of ceramics, comprising 0.1 to 10% by weight of yttrium oxide; 0.1 to 10% by weight of aluminum oxide; 0.1 to 10% by weight of aluminum nitride; 0.1 to 5% by weight of at least one silicide selected from the group consisting of magnesium silicide, calc
4407970 Sintered body of ceramics and preparation thereof October 4, 1983
There are disclosed a sintered body of ceramics, comprising 0.1 to 10% by weight of Y.sub.2 O.sub.3 ; 0.1 to 10% by weight of Al.sub.2 O.sub.3 ; 0.1 to 10% by weight of AlN; 0.1 to 5% by weight of at least one oxide selected from the group consisting of Li.sub.2 O, BeO, CaO, V.sub.2
4341874 Si.sub.3 N.sub.4 Ceramic powder material and method for manufacturing the same July 27, 1982
Ceramic powder material mainly consists of silicon nitride wherein the content of oxygen combined with generally unavoidable impurities as measured by activation analysis accounts for less than 2% by weight. The above-mentioned ceramic powder material can also be prepared preferably by
4327187 Method of producing sintered body of ceramics April 27, 1982
Disclosed is a method of producing a sintered body of ceramics, wherein a powder mixture consisting, essentially of at most 10%, exclusive of 0%, by weight of yttrium oxide, at most 10%, exclusive of 0%, by weight of aluminum oxide, at most 10%, exclusive of 0%, by weight of aluminum
4296065 Method of producing highly densified ceramic articles October 20, 1981
A method of producing ceramic articles having a density substantially equal to the theoretical density comprises heating a highly porous preliminary molding made of a ceramic powder to obtain a preliminarily sintered molding of a porosity below 30%, followed by sintering the preliminaril
4284432 Ceramic powder material and method for manufacturing the same August 18, 1981
Ceramic powder material mainly consists of silicon nitride wherein the content of oxygen combined with generally unavoidable impurities as measured by activation analysis accounts for less than 2% by weight. The above-mentioned ceramic powder material can also be prepared preferably by
4230494 Article highly resistant to corrosion by gallium phosphide and gallium arsenide October 28, 1980
An article has a portion contacted by gallium phosphide or gallium arsenide. At least the contacting portion is formed of a sintered body of a mixture of silicon nitride and an additive, and part or the whole of the additive is present as a crystallized phase in the sintered silicon
4172107 Method of manufacturing composite ceramic articles October 23, 1979
Composite ceramic articles formed by integrally assembling a plurality of previously molded constituent members without applying an adhesive to their joints and designed to have a density higher than 98% of the theoretical value, and a flexural strength greater than 50 kg/cm.sup.2 at
4168449 Rotary anode for X-ray tube and a method for manufacturing the same September 18, 1979
A rotary anode for an X-ray tube comprising an anode body formed of graphite, a target layer formed of tungsten or alloy thereof, and an intermediate layer containing rhenium and molybdenum, the intermediate layer being interposed between and bonded with the anode body and target lay
4156051 Composite ceramic articles May 22, 1979
Composite ceramic articles formed by integrally assembling a plurality of previously molded constituent members without applying an adhesive to their joints and designed to have a density than higher 98% of the theoretical value, and a flexural strength greater than 50 kg/cm.sup.2 at
4143107 Silicon nitride-based sintered material and method for manufacturing the same March 6, 1979
Disclosed is a silicon nitride-based sintered material having high heat resistance and containing crystal compounds prepared from the silicon nitride and at least one oxide of a rare earth element.










 
 
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