Sumitomo Metal Industries, Inc.

Akihiro Yauchi

Kazuhito Kamei

Kazuhiko Kusunoki

Nobuyoshi Yashiro

Nobuhiro Okada

Kunihiro Fukui

Minoru Nishihara

Yoshiyasu Morita

Hisakazu Kawashima

Shinji Shimosaki

Yutaka Itoh

Yoshihisa Ueda

A method capable of stably manufacturing a SiC single crystal in the form of a thin film or a bulk crystal having a low carrier density of at most 5&#xd7;10/cmand preferably less than 1&#xd7;10/cmand which is suitable for use in various devices by liquid phase growth using a SiC solution in which the solvent is a melt of a Si alloy employs a Si alloy having a composition which is expressed by SiCrTiwherein x, y, and z (each in atomic percent) satisfy0.50&#x3c;x&#x3c;0.68, 0.08&#x3c;y&#x3c;0.35, and 0.08&#x3c;z&#x3c;0.35, or &#x2003;&#x2003;(1)0.40&#x3c;x&#x2266;0.50, 0.15&#x3c;y&#x3c;0.40, and 0.15&#x3c;z&#x3c;0.35.&#x2003;&#x2003;(2)x, y, and z preferably satisfy 0.53&#x3c;x&#x3c;0.65, 0.1&#x3c;y&#x3c;0.3, and 0.1&#x3c;z&#x3c;0.3.

Method of manufacturing a silicon carbide single crystal

A SiC single crystal is produced by the solution growth method in which a seed crystal attached to a seed shaft is immersed in a solution of SiC dissolved in a melt of Si or a Si alloy and a SiC single crystal is allowed to grow on the seed crystal by gradually cooling the solution or by providing a temperature gradient therein. To this method, accelerated rotation of a crucible is applied by repeatedly accelerating to a prescribed rotational speed and holding at that speed and decelerating to a lower rotational speed or a 0 rotational speed. The rotational direction of the crucible may be reversed each acceleration. The seed shaft may also be rotated synchronously with the rotation of the crucible in the same or opposite rotational as the crucible. A large, good quality single crystal having no inclusions are produced with a high crystal growth rate.

Method for preparing silicon carbide single crystal

A joint for used in connecting oil well casing and/or tubing and method of producing same are disclosed. The joint with improved metal-to-metal sealing properties as well as improved resistance to galling is made of an alloy steel containing 10% or more by weight of Cr and comprises a metal sealing portion and a threaded portion provided with an activating layer of a metal or an alloy selected iron, nickel, zinc, cobalt, copper, manganese, chromium and alloys thereof, and an electrodeposited layer of a metal or an alloy selected from iron, copper, zinc, chromium, nickel, and alloys thereof.

Oil well casing and tubing joint and production of same

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Nishinomiya, Japan

Akihiro Yauchi