Kyocera Corporation

Shuichi Tateno

Tatsuyuki Nakaoka

Takashi Watanabe

Kenichi Tajima

Takero Fukudome

Masahito Nakanishi

Saburou Nagano

Hiroshi Yoshimitsu

Kouichi Kamitubo

Katsura Hayashi

Masahiro Waki

Akihiko Nishimoto

Riichi Sasamori

Yuji Iino

Kenji Noda

Takahiko Makino

YaoCan Zhu

Shigeaki Fukumoto

Yukihiro Hiramatsu

A silicon nitride cutting tool comprising a sintered product is disclosed. The sintered product comprises silicon nitride, at least one rare earth element compound, and a magnesium compound. The silicon nitride cutting tool further comprises a surface region and an inside region comprising the sintered product with varying content ratios of component compounds to provide enhanced wear and fracture resistance.

Silicon nitride cutting tool

An object of embodiments according to the invention is to provide a cutting tool having good wear resistance, good sliding property and good fracture resistance. A cutting toolcomprising a substrateand a coating layeror a coating layerwhich covers a surface of the substrate. The coating layeror the coating layercomprising a first layerand a second layer. The first layercomprises TiAlWSiM(CN) when M is at least one selected from Nb, Mo, Hf and Y, 0.45&#x2266;a&#x2266;0.55, 0.01&#x2266;b&#x2266;0.1, 0&#x2266;c&#x2266;0.05, 0.01&#x2266;d&#x2266;0.1, 0&#x2266;x&#x2266;1). The second layercomprises TiAlSiM'(CN) when M&#x2032; is at least one selected from Nb, Mo, Ta, Hf and Y, 0.50&#x2266;e&#x2266;0.60, 0&#x2266;f&#x2266;0.1, 0.05&#x2266;g&#x2266;0.15, 0&#x2266;y&#x2266;1).

Cutting tool

A sintered product of silicon nitride includes a crystal phase mainly having silicon nitride crystal grains and an amorphous grain-boundary phase located on the grain boundaries of the silicon nitride crystal grains. The grain-boundary phase contains lanthanum, aluminum, magnesium, silicon, and oxygen. The sintered product described above contains 0.1% by mass or more of lanthanum on an oxide basis, 0.05 to 0.6% by mass of aluminum on an oxide basis, 0.3% by mass or more of magnesium on an oxide basis, and 2.5% by mass or less of oxygen. The total amount of lanthanum on an oxide basis, aluminum on an oxide basis, and magnesium on an oxide basis is 3.5% by mass or less.

Composition, sintered product of silicon nitride, article of manufacture, and cutting method

A multilayer wiring board formed by laminating a plurality of circuit board units each including an insulating board containing at least a thermosetting resin, and a wiring circuit layer formed on the surface of said insulating board, wherein said insulating board is provided with via hole conducting passages so as to electrically connect the wiring circuit layers of the neighboring circuit board units, said via hole conducting passages are formed by filling via holes formed in the insulating board with a conducting paste, and said wiring circuit layer is buried in the surface of the insulating board in a manner that said insulating board possesses a flat surface. The multilayer wiring board has a satisfactory flatness required for mounting flip chips. Besides, the insulating board and the via hole conducting passages are not infiltrated by chemicals such as etching solution or plating solution. There is no problem of defective circuit, and connection is highly reliably maintained offering advantage in realizing a highly dense wiring.

Process for producing a multi-layer wiring board

Disclosed is a composite ceramic sintered material comprising a surface layer of a composition which contains the silicon nitride and carbon, and an internal portion of the silicon carbide or a combination of the silicon carbide, silicon nitride and carbon, the content of carbon or the content of the silicon nitride being greater in the surface layer than in the internal portion.

Composite ceramic sintered material and slider member using the same

Composite ceramic sintered material

Growing community of inventors

Kagoshima, Japan

Shuichi Tateno