Browse Prior Art Database

Flame Spray Masking Technique

IP.com Disclosure Number: IPCOM000079427D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

McClocklin, RS: AUTHOR [+2]

Abstract

A very narrow slit may be formed on an optical aperture plate by utilizing Nitinol wire as a mask (55% Ni, 45%Ti) while coating the unmasked areas with an opaque, wear-resistant ceramic material, by plasma or thermal flame spraying.

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Flame Spray Masking Technique

A very narrow slit may be formed on an optical aperture plate by utilizing Nitinol wire as a mask (55% Ni, 45%Ti) while coating the unmasked areas with an opaque, wear-resistant ceramic material, by plasma or thermal flame spraying.

Referring to the drawing, the aperture plate 20 is held to the holding fixture 21 by a vacuum source connected to plenum within fixture 21. The Nitinol wire 10 extends through bores 11 in fixture 21, and is drawn across and in contact with the plate 20 at the location where the narrow aperture is to be formed. Wire tension is adjusted by pulling on the free ends 13 of wire 10 and clamping the wire in position by screws 12. Support wires 14, placed slightly above the surface of fixture 21, are used to prevent sharp angles at the points where the Nitinol wire 10 leaves the aperture plate and the fixture. Since Nitinol wire 10 has a negative coefficient of expansion, it will contract rather than expand when heated up by the operation of the plasma flame spray gun 22, thus preventing sag which would result in a distorted slit. To provide closer control over the amount of contraction and to prevent excessive tension, cooling air, delivered by vent pipes 23, is directed at the Nitinol wire 10 in the region between the aperture plate and the holding fixture.

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