Ube Industries, Inc.

Ube Corporation

Mao Sumino

Masataka Fujinaga

Shinsuke Jida

Kazuki Iwashita

Takuma Sakai

Hiroyuki Yamaoka

Takayuki Ueda

Hideki Ozawa

Kouichirou Suyama

Yuusuke Tominaga

A crystalline silicon carbide fiber containing silicon carbide and boron nitride, the crystalline silicon carbide fiber having a content of Si of 64% to 72% by weight, a content of C of 28% to 35% by weight, and a content of B of 0.1% to 3.0% by weight, and including, at a surface portion, a composition gradient layer in which a content of silicon carbide increases while a content of boron nitride decreases toward a depth direction.

Crystalline silicon carbide fiber and method for manufacturing same, and ceramic composite substrate

An oxynitride phosphor powder has a fluorescence peak wavelength of 587 to 630 nm and a high external quantum efficiency. A method of producing the oxynitride phosphor powder containing Li at 50 to 10,000 ppm includes mixing silicon nitride powder, a substance serving as an aluminum source, a substance serving as a calcium source and a substance serving as an europium source; firing the mixture at 1500 to 2000&#xb0; C. in an inert gas atmosphere or a reducing gas atmosphere to obtain a fired oxynitride phosphor composed mainly of Ca-containing &#x3b1;-SiAlON, as an intermediate; and heat treating the fired oxynitride phosphor at a temperature of 1450&#xb0; C. to less than the firing temperature, in an inert gas atmosphere or in a reducing gas atmosphere in the presence of Li.

Oxynitride phosphor powder and method for producing same

An (oxy)nitride phosphor powder has a fluorescence peak wavelength of 610 to 625 nm and also has higher external quantum efficiency than the conventional one. The (oxy)nitride phosphor powder includes an &#x3b1;-type SiAlON and aluminum nitride, represented by the compositional formula: CaEuSiAlONwherein x1, x2, y, z fulfill the following formulae: 1.60&#x2266;x1+x2&#x2266;2.90, 0.18&#x2266;x2/x1&#x2266;0.70, 4.0&#x2266;y&#x2266;6.5, 0.0&#x2266;z&#x2266;1.0. The powder can additionally contain Li in an amount of 50 to 10000 ppm. The content of the aluminum nitride may be more than 0 mass % to less than 33 mass %.

(Oxy)nitride phosphor powder and method of producing same

An oxynitride phosphor powder is an &#x3b1;-SiAlON phosphor having a dominant wavelength of 565-577 nm and fluorescence intensity and external quantum efficiency that are high enough for practical use. The oxynitride phosphor powder comprises an &#x3b1;-SiAlON represented by the compositional formula: CaEuYbSiAlON(wherein 0.0&#x3c;x1&#x2266;2.0, 0.0000&#x3c;x2&#x2266;0.0100, 0.0000&#x3c;x3&#x2266;0.0100, 0.4&#x2266;x2/x3&#x2266;1.4, 1.0&#x2266;y&#x2266;4.0, 0.5&#x2266;z&#x2266;2.0).

Oxynitride phosphor powder

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Ube, Japan

Mao Sumino