Sumitomo Electric Industries, Limited

Sumitmo Electric

Tetsuo Nakai

Mitsuhiro Goto

Junichi Shiraishi

Satoru Kukino

Tomohiro Fukaya

Tsutomu Nakamura

Shuji Yazu

Yasuyuki Kanada

Akio Hara

Katsuhito Yoshida

Makoto Setoyama

Yasunobu Ogata

Shinya Uesaka

Takashi Yoshioka

Takahisa Iguchi

Hiroshi Kawauchi

Kunihiro Tomita

Takashi Harada

Haruyo Fukui

Makoto Abe

Hisanori Ohara

Yoshihiro Kuroda

Hideaki Morigami

Michiko Ota

Noboru Yamazaki

Yoshiaki Kumazawa

Michinari Asano

Hirohumi Mizusuna

Kenichi Kikutani

Yuichiro Kono

Syuzi Yazu

Takahiro Awaji

Keizo Asai

This invention relates to a high thermal conductivity composite material which comprises diamond particles and a copper matrix useful as electronic heat sinks for electronics parts, particularly for semiconductor lasers, high performance MPUs (micro-processing units), etc., also to a process for the production of the same and a heat sink using the same. According to the high thermal conductivity diamond sintered compact of the present invention, in particular, there can be provided a heat sink having a high thermal conductivity as well as matching of thermal expansions, most suitable for mounting a large sized and high thermal load semiconductor chip, for example, high output semiconductor lasers, high performance MPU, etc. Furthermore, the properties such as thermal conductivity and thermal expansion can freely be controlled, so it is possible to select the most suitable heat sink depending upon the features and designs of elements to be mounted.

Sintered diamond having high thermal conductivity and method for producing the same and heat sink employing it

A coated sintered body can be used for a cutting tool for precision machining of hardened steel. The coated PCBN cutting tool includes a substrate which contains not less than 35 volume % and not more than 85 volume % of CBN, and a hard coated layer formed on the substrate. The hard coated layer comprises at least one compound layer consisting of at least one element selected from the group 4a, 5a, and 6a elements of the periodic table and Al, and at least one element selected from C, N and O. The thickness of the layer is not less than 0.3 &mgr;m and not more than 10 &mgr;m. The center-line mean roughness of the hard coated layer is not more than 0.1 &mgr;m.

Coated PCBN cutting tools

A sintered material containing high-pressure phase-type boron nitride and a binder is provided. The high-pressure phase-type boron nitride is contained in an amount of from 50% to 78% by volume, and the balance is a binder phase. The binder phase comprises at least one selected from the group consisting of nitride, carbide, carbonitride, and boride of Ti, nitride, boride and oxide of Al, carbide and boride of W, nitride, carbide, carbonitride and boride of Co, and carbide and boride of Ni, or a mutual solid solution thereof. The binder phase forms a binder phase which is continuous in a sintered material texture. The weight of metal components Al, W, Co and Ni which are present as compounds in the sintered material is from 3% to 20% based on the sintered material. The sintered material is excellent in crater resistance and capable of realizing a long tool life, even under the condition that the temperature of the cutting edge becomes high and the impact is large, as in high-speed interrupted cutting of hardened steel where the cutting speed V becomes at least 150 m/min.

High strength sintered impact having excellent resistance to cratering

A diamond sintered body tool ( ) having superior adhesion resistance, chipping resistance and high strength includes a tool base material ( ) including a diamond sintered body, and a surface layer ( ) formed on a surface of the tool base material ( ). The surface layer ( ) includes at least one of silicon, a silicon oxide, a silicon carbide, a silicon nitride and a solid solution thereof. The tool base material ( ) has an inner portion ( ) including a first content of an iron group metal, and a surface portion ( ) surrounding the inner portion ( ) and including a second content of the iron group metal lower than the first content.

Sintered diamond tool and method for manufacturing the same

Polycrystal diamond tool

Diamond sintered compact and a process for the production of the same

A cutting tool according to the present invention is coated with one or more Al O layers on at least a part of the surface of a cBN-based sintered material substrate taking part in cutting. The sintered material substrate is made of cBN in an amount of from 20% to 99% by volume and Al O having an average crystalline particle diameter of not more than 1 &mgr;m in an amount of from not less than 1.0% to less than 10% by volume. The Al O layer has a thickness (d) of from 0.5 &mgr;m to 50 &mgr;m. The average crystalline particle diameter (s) of Al O is from 0.01 &mgr;m to 4 &mgr;m if the thickness (d) of the Al O layer is from 0.5 &mgr;m to 25 &mgr;m or from not less than 0.01 &mgr;m to not more than 10 &mgr;m if the thickness (d) of the Al O layer is from more than 25 &mgr;m to 50 &mgr;m.

Cutting tool made of A12O3-coated cBN-based sintered material

A polycrystal diamond tool is provided whose heat resistance, strength and anti-adhesion property are improved by modifying the porosity of a diamond sintered compact and which comprises a diamond sintered compact, sintered under ultra-high pressure and high temperature, brazed onto a tool substrate, in which the cutting edge vicinity part consists of 85 to 99 volume % of the diamond sintered compact material consisting of diamond grains bonded with each other and the balance of pores, and the other part than the cutting edge vicinity part consists of diamond grains and the balance of a brazing material.

A sintered body contains a high pressure form boron nitride in the range of 20 to 70% by volume, a first binding material surrounding the high pressure form boron nitride with a thickness in the range of 5 nm to 300 nm and a second binding material of the balance. The first binding material is composed of at least one of nitride and boride of Ti and Al. The second binding material is composed of at least one selected from the group consisting of nitride, carbide, carbonitride, boride and oxide of Al and transition metals belonging to the group 4,, 5,and 6,in the periodic table and mutual solid solution thereof. Supposing that X is the amount of Al contained per unit volume in the first binding material and Y is the amount of Al contained per unit volume in the second binding material, the ratio X/Y is not less than 1.

High strength sintered body

A diamond sintered body having high wear resistance, chipping resistance, shock resistance and thermal conductivity is provided. The diamond sintered body includes sintered diamond particles and a sintering aid as the remainder. The content of the sintered diamond particles is at least 80% by volume and less than 99% by volume. The sintered diamond particles have a particle size in the range from at least 0.1 &mgr;m to at most 70 &mgr;m. The sintered diamond particles next to each other are directly bonded. The sintering aid includes at least one kind selected from tungsten, iron, cobalt and nickel. The percentage of the tungsten in the sintered body is in the range from at least 0.01% by weight to at most 8% by weight.

Diamond sintered body having high strength and high wear resistance, and tool including the same

A tool manufactured by brazing a hard sintered body such as a diamond or cBN to a tool substrate through a bonding layer comprising at least one of Ti and Zr by 15-65 wt % and Cu. Two ridges of the tool substrate on both sides each has a first ridge adjacent to and aligned with a ridge of the hard sintered body and a second ridge provided nearer to an inscribed circle of the tool than is the ridge of the hard sintered body. Also, an upright side face and a bottom of each seating groove formed in the tool substrate intersect each other at an angle smaller than the intersecting angle between a back side and a bottom of each hard sintered body.

Hard sintered body tool

A method of cutting hardened steel using a cBN sintered tool which can improve the surface roughness while maintaining high dimensional accuracy. The upper limit of the tool feed rate is set at such a value that a theoretical surface roughness calculated from the feed rate is between 2/3 and 1/1000 of the target surface roughness. The amount of change of the feed rate between the upper and lower limits of the tool feed rate is set to be between 0.002 and 0.05 mm/rev, and the amount of every feed rate change is set not to be equal to the original feed rate multiplied by an integer. The feed rate is changed forcibly for every number of workpieces for which the total cutting length is between 10 and 1000 meters.

Method of cutting hardened steel with high accuracy

High-pressure phase boron nitride base sinter

A sintered body consists of high-pressure phase boron nitride, a residual binder phase and an unavoidable impurity, and contains high-pressure phase boron nitride powder which is previously coated with a binder before sintering. The coating binder consists of an element belonging to the group 4a, 5a or 6a of the periodic table or the like, and has an average thickness of 5 to 300 nm. Binder powder other than the coating binder consists of an element belonging to the group 4a, 5a or 6a of the periodic table or the like, and a contact ratio of high-pressure phase boron nitride particles in surface-to-surface contact with each other is at least 20% and less than 50%. The resulting high-pressure phase boron nitride-based hard and tough sintered body for a cutting tool is improved in wear resistance and chipping resistance.

Hard and tough sintered body

A hard sintered body for a tool contains 25 to 47 vol. % of cBN, 40 to 70 vol. % and especially less than 45 vol. % in total of a carbo-nitride, and a boride of Ti, and 2 to 20 vol. % in total of a boride and a nitride of Al. In the carbo-nitride of Ti, the ratio of carbon to nitrogen is in the range of 60:40 to 30:70. In this hard sintered body, cBN particles are bonded to each other through binder phases. The obtained hard sintered body for a tool is excellent in wear resistance and chipping resistance for high-speed cutting of hardened steel.

Hard sintered body for tool

Growing community of inventors

Hyogo, Japan

Tetsuo Nakai