Mitsubishi Materials Corporation

Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo

Okayama University

Toshihiko Matsuo

Wardoyo Akhmadi Eko

Chihiro Sakurazawa

Masashi Kurimoto

Hiroshi Yamauchi

Yuichiro Takeuchi

Sadaharu Suga

Masahiro Yano

Tadakazu Ohashi

Koji Fukata

Yasufumi Dan-Oh

Minoru Akaishi

Tetsuya Uchida

Yuki Akahoshi

Masayuki Koshiyama

Yoichi Hamada

A base material for a hard sintered body includes a pillar portion having a central axis and extending in the axial direction of the central axis. The pillar portion has a first outer peripheral portion, a second outer peripheral portion, and a protruding stripe portion. In the cross-sectional view, one side portion of the first outer peripheral portion extending in a circumferential direction or a radial direction is located inside the other side portion. In the cross-sectional view, one side portion of the second outer peripheral portion extending in the circumferential direction or the radial direction is located outside the other side portion in the radial direction. The protruding stripe portion is located in a connection portion between the other side portion of the first outer peripheral portion and one side portion of the second outer peripheral portion, and protrudes outward.

Base material for hard sintered body, hard sintered body, and cutting tool

A drilling tip includes a tip main body that has a posterior end portion having a columnar or disk shape centered on a tip center line and a distal end portion and is made of a cemented carbide and a hard layer that coats the distal end portion and is made of a polycrystalline diamond sintered body. The distal end portion has a convex portion, and a concave portion. A diameter D of the posterior end portion is 8 mm to 20 mm. A ratio r/D of a radius rof the convex portion is 0.1 to 0.65, and a ratio r/D of a radius rof the concave portion is 0.05 to 3.0. An angle formed by a straight line that connects a tangent point which the convex portion tangents to the concave portion and a center of the convex portion to each other is 20&#xb0; to 90&#xb0;.

Drilling tip and drill bit

A polycrystalline diamond sintered material tool includes: a cemented carbide substrate, which is mainly composed of WC and includes Co; and a diamond layer containing a metal catalyst made of Co provided on the cemented carbide substrate. The average layer thickness of a Co rich layer formed in an interface between the cemented carbide substrate and the diamond layer is 30 &#x3bc;m or less. C/Cis 2 or less when Cis an average content of Co included in the diamond layer and Cis a peak value of a Co content in the Co rich layer. D/Dis less than 2 when D is an average grain size of WC particles in a region from the interface between the cemented carbide substrate and the diamond layer to 50 &#x3bc;m toward an inside of the cemented carbide substrate; and Dis an average grain size of WC particles.

Polycrystalline diamond sintered material tool excellent in interfacial bonding strength and method of producing same

A drilling tip according to the disclosure has a tip body which is provided with a tip portion tapered toward a tip side of the tip body; and a hard layer which is formed on a surface of the tip portion of the tip body, an outermost layer of the hard layer is a cBN sintered material having 70 to 95 vol % of cBN grains, and when a cross-sectional structure of the outermost layer is observed, a binder phase having a width of 1 nm or greater and 30 nm or less and containing Al, B, and N, and in which a ratio of an O content to an Al content is 0.1 or less exists between neighboring cBN grains.

Drilling tip, drilling tool, and method of manufacturing drilling tip

A drill bit insert attached to a tip portion of a drill bit to perform drilling, includes: an insert body () that includes: a rear end portion buried in a bit body of the drill bit; and a tip portion protruding from a surface of the drill bit and tapered toward a tip side of the insert body, in which a surface of at least the tip portion of the insert body () made of polycrystalline cubic boron nitride compact () sintered using a catalytic metal containing Al and at least one selected from the group consisting of Co, Ni, Mn, and Fe and containing 70 vol % to 95 vol % of cubic boron nitride.

Drill bit insert and drill bit

In a drill bit insert of the present invention, an insert body of the drill bit insert includes: a rear end portion forming a columnar shape or a disk-like shape; an intermediate portion having an outer diameter smaller than that of the rear end portion; and an end portion having an outer diameter from the center line of the insert gradually decreasing toward the tip side, the hard surface layer is coated on the insert body from a surface of the end portion of the insert body to an outer periphery of the intermediate portion, and an outer diameter of the hard surface layer on the intermediate portion is equal to that of the rear end portion.

A rotary cutting tool including a polycrystalline diamond material of the invention includes: a tool body rotated about an axis with a carbide substrate made of cemented carbide and a flute provided at a tip portion thereof; a PCD layer sintered integrally with the carbide substrate, provided on an inside face of the flute facing in a rotation direction; and a cutting edge provided on the PCD layer to have the inside face as a rake face, in which a margin portion continuous with a rear side of the flute in the rotation direction is formed on an outer periphery of the tip portion, the cutting edge is formed at a ridge portion of the rake face, and a thickness of the PCD layer is &#x2153; to 1 times a width of the margin portion.

Rotary cutting tool including polycrystalline diamond material

A drill bit button insert is attached to a button inserts mounted in a drill bit and performs a drilling. The drill bit button insert includes a tip body and an abrasive layer that is formed of a diamond sintered body harder than the tip body and is coated at least at the button insert working surface of the tip body. The abrasive layer has two or more high hardness layers and a low hardness layer having a hardness lower than that of the high hardness layers disposed between the high hardness layers. The high hardness layers and the low hardness layer are provided from the surface side of the abrasive layer toward the tip body side.

Drill bit button insert and drill bit

There is provided a method for producing an artificial retina in which an organic dye compound that induces a receptor potential responding to photostimulation is fixed on a polymer sheet substrate, comprising a bonding step of immersing the substrate in a solution containing the organic dye compound to chemically bond the organic dye compound to the substrate; a first washing step of washing with water the substrate to which the organic dye compound has been chemically bonded; and a second washing step of, after the first washing step, washing with an organic solvent the substrate to which the organic dye compound has been chemically bonded. Thus, there can be provided an artificial retina which has excellent mechanical properties such as elongation at break and good biocompatibility, and is capable of inducing a receptor potential responding to photostimulation with high sensitivity.

Method for producing artificial retina

An ophthalmic pharmaceutical composition comprising trehalose as an effective ingredient and a pharmaceutically-acceptable carrier. The pharmaceutical composition is a safe, long-term continuously-administrable, therapeutic and/or prophylactic agent for the ophthalmologic clinical symptoms and signs in Sj&#xf6;gren syndrome.

Pharmaceutical composition for ophthalmic use

Disclosed is an agent for inducing receptor potential, which comprises an organic dye compound capable of inducing/evoking receptor potential in response to photostimulation in the optic nerve, wherein the organic dye compound is a polymethine organic dye compound. Also disclosed is a substituent material for the retina comprising the agent.

Agent for inducing receptor potential

An ophthalmic pharmaceutical composition comprising trehalose as an effective ingredient and a pharmaceutically-acceptable carrier. The pharmaceutical composition is a safe, long-term continuously-administrable, therapeutic and/or prophylactic agent for the ophthalmologic clinical symptoms and signs in Sj&ouml;gren syndrome.

Growing community of inventors

Naka-gun, Japan

Toshihiko Matsuo