Flame spraying method and composition

DETAILED DESCRIPTION OF THE INVENTION The best modes of practicing the present invention is illustrated and described in the following specific examples.
EXAMPLE I In a coke oven lined with silica bricks, the damaged areas which included both cracks and spalls were repaired in situ by flame spraying according to the invention material which contained 82% of crushed silica brick -12.
times.
D USS mesh as the incombustible refractory portion and 17.
25% of silicon metal powder, 0.
5% of magnesium metal powder and 0.
25% of zinc metal powder, all -325.
times.
D USS mesh.
The material was mixed with oxygen and formed a solid refractory repair mass fuzed to the refractories being repaired.
EXAMPLE II Coke oven walls as in Example I were repaired with the following recipe which resulted in a good repair mass:
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Particle
% by Weight
Grading of
(USS Mesh)
Total
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silica refractory grain
-12 .
times.
D
80.
75%
silicon powder -325 .
times.
D
18%
zinc powder -325 .
times.
D
1%
magnesium powder -325 .
times.
D
.
25%
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EXAMPLE III Coke oven walls as in Example I were repaired using the following mixture:
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silica refractory grain
-25 + 50 43%
silica refractory grain
-50 + 100 40%
silicon powder -325 .
times.
D
16%
zinc powder -325 .
times.
D
1%
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EXAMPLE IV The process of Example I was repeated using the following mixture:
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silica brick crushed
-12