Plastic and nonmetallic article shaping or treating: processes – Flame contact or reshaping by heat decomposition of work
Patent
1992-06-11
1993-09-07
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
Flame contact or reshaping by heat decomposition of work
264 30, 264 31, 264 35, 264 36, 264 81, 264309, 266281, 427140, 501 88, 501 94, B28B 132, B32B 3500, C04B 3502, F27D 116
Patent
active
052426394
ABSTRACT:
In ceramic welding processes, oxidising gas and a mixture of refractory and fuel powders are projected against a surface and the fuel is burnt to generate sufficient heat that the refractory powder becomes at least partially melted or softened and a cohesive refractory mass is progressively built up against that surface. In order to reduce any tendency for the weld mass to include a low-grade refractory phase and thus promote the refractoriness of that weld mass, the fuel powder is present in a proportion of not more than 15% by weight of the total mixture and includes at least two metals selected from aluminium, magnesium, chromium and zirconium, and in that at least the major part by weight of the refractory powder consists of one or more of magnesia, alumina and chromic oxide, and in that the molar proportions of silica and calcium oxide present in the refractory powder (if any) satisfy the following expression: molar concentration of SiO.sub.2 in % .ltoreq.0.2+molar concentration of CaO in %
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Cherico Stephen D.
Moreau Jean
Mottet Leon P.
Robyn Pierre
van Marcke de Lummen Guy
Aftergut Karen
Glaverbel
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