Metal spray powders
 PTA
Plasma Transferred Arc (PTA) surfacing is a welding process in
which the powder is introduced into a combined arc/plasma stream
to form a molten pool on the work-piece.
The arc between work-piece and gun also results from surface melting
of the base material, and a dilution of 5-15% in the deposit is
typical. Coating thickness ranges from 1-6 mm, and deposit rate
is up to 12 kg/h.
The PTA process is well suited to automated operation, and is therefore
suitable for high-volume applications such as exhaust valves. Extensive
information on PTA surfacing technique and its possibilities is
available directly from Höganäs Division Gas Atomised Powder.
PTA 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
|
Particle Size micron
|
C%
|
Si%
|
B%
|
Fe%
|
Cr%
|
Ni%
|
Mo%
|
Cu%
|
Others%
|
Vickers Hb
|
Recommended use
|
|
625
|
150-53
|
0.02
|
0.25
|
-
|
0.7
|
21.5
|
Bal
|
9.0
|
-
|
Nb 3.6%
|
200
|
IN 625 *
Nickel base for medium to hard welds; for
diesel engine valves and various types of seals.
|
|
1540
|
150-53
|
0.25
|
3.5
|
1.6
|
2.5
|
7.5
|
Bal
|
-
|
-
|
-
|
420
|
|
1550
|
150-53
|
0.45
|
3.9
|
2.3
|
2.9
|
11.0
|
Bal
|
-
|
-
|
-
|
580
|
|
1560
|
150-53
|
0.75
|
4.3
|
3.1
|
3.5
|
14.8
|
Bal
|
-
|
-
|
-
|
810
|
* Registered trademark of INCO Corp.
PTA grades - Cobalt base
|
HMSP
|
Particle Size micron
|
C%
|
Si%
|
Fe%
|
Cr%
|
Ni%
|
Co%
|
Mo%
|
W%
|
Vickers Hb
|
Recommended use
|
|
2537
|
150-53
|
1.1
|
1.0
|
-
|
28.5
|
-
|
Bal
|
-
|
4.2
|
480
|
Stellite 6 *
Stellite F *
Stellite 12 *
|
|
2540
|
150-53
|
1.7
|
1.2
|
-
|
25.7
|
22.5
|
Bal
|
-
|
12.5
|
480
|
|
2541
|
150-53
|
1.4
|
1.1
|
-
|
28.5
|
-
|
Bal
|
-
|
8.0
|
500
|
*Registered trademark Stoody Deloro Stellite Corp.
PTA grades - Iron base
|
HMSP
|
Particle Size micron
|
C%
|
Si%
|
Fe%
|
Cr%
|
Ni%
|
Mo%
|
Mn%
|
Others%
|
Vickers Hb
|
Recommended use
|
|
316L
|
150-53
|
<0.03
|
0.8
|
Bal
|
17.0
|
12.0
|
2.5
|
0.2
|
-
|
160
|
316 stainless steel *
|
*A.I.S.I. standard
Miscellaneous grades
|
Designation
|
HMSP
|
C%
|
Si%
|
Fe%
|
Cr%
|
Ni%
|
Mo%
|
Cu%
|
Mn%
|
Al%
|
Recommended use
|
|
Ni5Al
|
5210-40
|
-
|
0.5
|
-
|
-
|
Bal
|
-
|
-
|
-
|
5.0
|
Nickel-aluminum powder.
|
|
316L
|
5220
|
<0.03
|
0.8
|
Bal
|
17.0
|
12.0
|
2.5
|
-
|
0.2
|
-
|
Acid-resistant stainless steel (316L)
|
|
Cu10Al
|
5230
|
-
|
-
|
-
|
-
|
-
|
-
|
Bal
|
-
|
10.0
|
Aluminium bronze powder for good frictional
wear-resistance on propeller and conveyor shafts.
|
|
Ni7Cr
|
5240
|
0.25
|
3.5
|
2.5
|
7.5
|
Bal
|
-
|
-
|
-
|
-
|
B = 1.6%
|
|
Fe
|
5250
|
-
|
-
|
Bal
|
-
|
-
|
-
|
-
|
-
|
-
|
|
|
80Ni20Cr
|
5270
|
0.20
|
1.0
|
-
|
19.5
|
Bal
|
-
|
-
|
0.5
|
-
|
|
Carbide Powder grades
|
HMSP
|
Particle Size micron
|
C%
|
Co%
|
W%
|
Recommended use
|
|
4070
4670
|
106-36
53-20
|
-
-
|
-
-
|
-
-
|
To be mixed with self-fluxing powders 1060
or 1660 to provide extremely hard coatings.
|
|
44712-10*
46712-10*
|
106-53
53-20
|
5.5
-
|
12.0
-
|
Bal
-
|
Agglomerated powder Wc-Co
To be mixed with flame-spraying powders. Spherical particles
give more uniform distribution of carbide in the matrix. Also
for plasma spraying.
|
* Spherical particles
|
