Nhk Spring Co., Ltd.

Yamamoto Precious Metal Co., Ltd.

Seiko Epson Corporation

Shinko Metal Products Co., Ltd.

Yamakin Co., Ltd.

Teruo Anraku

Kotaro Toyotake

Masayuki Ainoya

Tomohiro Kubota

Toshio Kazama

Hidefumi Nakamura

Noritoshi Takamura

Yoshihisa Tani

Satoshi Shoji

Tomoyuki Minami

Hitoshi Abe

Humio Takahashi

Hirohisa Yamamoto

Masatoshi Yamazoe

Takeshi Hoshikawa

An alloy material includes: a composition, in a composition range of a ternary alloy of silver (Ag), palladium (Pd), and copper (Cu), the composition containing 20 to 30 wt % of Ag, 35 to 55 wt % of Pd, and 20 to 40 wt % of Cu. The composition as a base is added with tin (Sn) in a range of 0.5 to 2.5 wt %, further added with any one of or a combination of cobalt (Co), chromium (Cr), and zinc (Zn) in a range of 0.1 to 1.0 wt %, and added with 0.01 to 0.1 wt % of either one of or a combination of iridium (Ir) and ruthenium (Ru).

Alloy material, contact probe, and connection terminal

A dental casting billet material includes: Co as a main component; Cr in a proportion of 26% by mass or more and 35% by mass or less; Mo in a proportion of 5% by mass or more and 12% by mass or less; and Si in a proportion of 0.3% by mass or more and 2.0% by mass or less, wherein the billet material is formed from a sintered body of a metal powder, and the billet material has a relative density of 92% or more and 99.5% or less.

Dental casting billet material, metal powder for powder metallurgy, dental metal component, and dental prosthesis

An alloy material includes: a composition containing 17 at % to 25 at % of silver (Ag), 30 at % to 45 at % of palladium (Pd), and 30 at % to 53 at % of copper (Cu) in a composition range of a ternary alloy of Ag, Pd, and Cu; and at least one of manganese (Mn), tin (Sn), silicon (Si), antimony (Sb), titanium (Ti) and magnesium (Mg) added to the composition in a range of 4.5 at % or less, and the Mn in a range of 0.5 at % to 3.5 at %, the Sn in a range of 1 at % to 2 at %, the Si in a range of 0.5 at % to 2 at %, the Sb in a range of 0.5 at % to 3 at %, the Ti in a range of 0.5 at % to 2 at %, and the Mg in a range of 0.5 at % to 3.5 at % are added to the composition.

The present invention provides a method for preparing a glass-ceramic containing leucite crystals, comprising the steps of: mixing (1) a glassy material comprising 53 to 65 wt. % of SiO , 13 to 23 wt. % of Al O , 9 to 20 wt. % of K O and 6 to 12 wt. % of Na O and (2) synthetic leucite seed crystals comprising 53 to 64 wt. % of SiO , 19 to 27 wt. % of Al O and 17 to 25 wt. % of K O, and heat-treating the mixture at 750 to 950&deg; C. for 1 to 5 hours; and a dental porcelain powder and a metal-ceramic restoration both comprising a glass-ceramic prepared by the method. The porcelain comprising the glass-ceramic prepared by the method is substantially free of opacification and decrease in the coefficient of thermal expansion, during fusion-bonding to a metal frame.

Method for preparing glass-ceramic

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Osaka, Japan

Teruo Anraku