Metal spray powders
 Flame spraying
With flame spraying, powder is fed into an oxy-acetylene or oxy-hydrogen
flame, and projected towards the base material at high speed.
The semi-molten particles flatten on impact, interlocking to the
base material and each other to form a mechanical bond. The deposit
will reach a density of about 85% of the theoretical. By subsequent
heating in a controlled-atmosphere furnace - or with a gas torch
at about 1,000°C - the deposit will fuse on the base material, forming
a dense coating and a metallurgical bond.
Deposit rate is 1-9 kg/h. Flame spraying can be used for coating
thicknesses of 0.1-3 mm.
Flame spraying is easily adapted to the spraying of cylindrical
parts - such as pump shafts, pistons and plungers - where the parts
can be rotated on a lathe or turntable.
Flame spraying gives a smoother surface than wire spraying, and
it is possible to use alloys with greater hardness, as well as mixtures
containing tungsten carbide.
Flame spraying grades - Nickel base
The following powders are normally carried in stock. There are
other powders in the range, which are available on request.
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HMSP
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Particle size micron
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C%
|
Si%
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B%
|
Fe%
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Cr%
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Ni%
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Mo%
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Cu%
|
Vickers Hb
|
Recommended Use
|
|
1240
1240-01
1340
|
106-36
106-45
125-45
|
0.25
|
3.5
|
1.6
|
2.5
|
7.5
|
Bal
|
-
|
-
|
380
|
Build up of layers on plungers in the glass
bottle manufacturing industry where good machinability is
required. Also for bearings, piston heads, shafts in rolling
mills, fan blades, valve gates, pump sleeves and pump motors.
|
|
1245
1345
|
106-36
125-45
|
0.35
|
3.7
|
1.8
|
2.6
|
8.9
|
Bal
|
-
|
-
|
450
|
|
1250
1350
|
106-36
125-45
|
0.45
|
3.9
|
2.3
|
2.9
|
11.0
|
Bal
|
-
|
-
|
570
|
Bearings, diesel engine valves, rocker arms,
valve seats, rolls for rolling mills, pump shafts, pump sleeves,
seal rings, piston rods, steam valves, screw conveyors, moulds
for bricks and ceramics, mixer blades, chip knives, etc.
Further improvements can be achieved by mixing
with tungsten carbides.
See also carbide powder grades.
|
|
1255-40
1355-40
|
106-36
125-45
|
0.6
|
4.2
|
3.6
|
3.0
|
16.2
|
Bal
|
2.6
|
2.6
|
710
|
|
1260
1360
1660-02
|
106-36
125-45
53-20
|
0.75
|
4.3
|
3.1
|
3.7
|
14.8
|
Bal
|
-
|
-
|
790
|
|
1360-20
|
125-45
|
0.9
|
4.3
|
3.3
|
4.2
|
16.3
|
Bal
|
-
|
-
|
820
|
Provide carbon rich matrix.
|
|
