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Ebina, Japan

Bucheeri A.,Ibaraki University | Kurishita H.,Tohoku University | Osone R.,Kinzoku Giken Co. | Naoe T.,Japan Atomic Energy Agency | And 3 more authors.
Journal of Materials Processing Technology | Year: 2010

There are many works focused on making meso-nozzle in metals or polymers for applications like bubble making or spraying. None of them reported successful achievement in fabricating deep holes in metals. A novel method to fabricate a meso-nozzle in metal is proposed in this paper. The method to make a suitable size holes uses refractory metal powders such as Mo and very fine glass fibers of 100 μm in diameter. It utilizes the mismatch in thermal properties between the powder and the fiber. Sintering at a temperature between their melting points causes glass to evaporate leaving a targeted shape of hole and densify the metal powder. Green compacts were prepared at various compressive loads and then subjected to sintering at temperatures below the melting points of the metal powder. The resulted hole exhibited straightness and a circular cross-section along the length. The inspection of the sintered part confirmed that the method is promising to fabricate deep meso-nozzles in metals. © 2009 Elsevier B.V. All rights reserved. Source


Suetsugu Y.,High Energy Accelerator Research Organization | Shirai M.,OHTSUKA Co. | Ohtsuka M.,OHTSUKA Co. | Nishidono T.,Komiyama Electronic Co. | And 5 more authors.
Journal of the Vacuum Society of Japan | Year: 2010

Based on experiences in the precedent stain-less steel case, a possibility of employing copper-alloy and aluminum-alloy MatsumotoOhtsuka (MO) -type flanges in a vacuum beam pipes for a particle accelerator is experimentally studied. They can mitigate the heating problems found in the case of stainless-steel flanges under high-intensity beams, and also simplify the manufacturing procedure of beam pipes. Copper-alloy flanges show a comparable vacuum sealing property to the stainless-steel one, and several beam pipes with the copper-alloy flange has been successfully installed in the KEKB B-factory positron ring. The R&D on aluminum-alloy flanges has just started, and a promising result is obtained. Any coatings or treatments to improve the hardness of sealing part can be omitted if duralumin-series aluminum alloys are used. However, further detailed investigations are required about the hardness and stiffness properties of the gasket and flange materials before applying the flanges to the real machine. Source

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