Thermal spray HVOF GLC-720 (GTV)
07-23-2009, 01:03 PM, (This post was last modified: 07-23-2009, 01:27 PM by SERGEY-MOSCOW.)
Thermal spray HVOF GLC-720 (GTV)
Hello, Forum!
Sorry for my English!!!

I have question. What grain size of a powder is used on GLC-720? Use of powders to 100 microns is possible?

Thank you.
07-23-2009, 01:36 PM,
RE: Thermal spray HVOF GLC-720 (GTV)
Hi Sergey

Sign0016 to the Surface Engineering Forum.

This will depend somewhat on the powder type you use and the quality/density of coating required. Lower melting point/higher thermal conductivity materials should be capable of being sprayed using larger particle sizes than high melting point/low thermal conductivity materials.
07-24-2009, 06:13 AM,
RE: Thermal spray HVOF GLC-720 (GTV)
Hello Gordon!
Sorry for my English!!! )))

We wish to use the given installation for thermal spray of cranked shaft of diesel engines of diesel locomotives. A thickness of a layer about 2,5 mm. Porosity of a layer about 5-8 %. A material of spraying NiCrBSi with additives Mo, Al. Earlier we spray cranked shaft a method thermal spray cord (SNMI). Bad quality cord materials let out in Russia has forced us to pass to a powder thermal spray.
07-25-2009, 03:48 PM,
RE: Thermal spray HVOF GLC-720 (GTV)
Hi Sergey

Typically for HVOF generally, around 50 micrometres is the high end of the particle distribution.

Which materials are you planning on HVOF spraying for your crankshafts?
07-27-2009, 06:23 AM, (This post was last modified: 07-27-2009, 06:28 AM by SERGEY-MOSCOW.)
RE: Thermal spray HVOF GLC-720 (GTV)
Hi Gordon

We plan thermal spray a powder mix consisting of NiCrBSi matrixes with hardness 38 HRC with additives of 5 % Mo and 2 % Al
(Ni - bas; Cr-8,0-12,0 %; B-1,5-3,0 %; Si-1,5-2,5 %; C-0,2-1,4 %; Fe-to 5 %; Al-1,3-2,3 %; Mo-4,5-6,5 %)
As an intermediate layer thermal spray NiAl95-5
07-27-2009, 04:28 PM,
RE: Thermal spray HVOF GLC-720 (GTV)
Hi Sergey

For NiCrBSi type powders HVOF grades are typically -45 +15 um (-325 mesh +15um).

When you say powder mix, does powder contain one alloy or is it a blend or composite? If a blend or composite you may find any intended exothermic/synergistic reactions during spraying quite different (little or no reaction) using HVOF compared to spraying cored materials.

With HVOF you will be capable or more likely getting much less than 5-8 % porosity (well with a straight HVOF grade NICrBSi alloy powder more like 1-2% or less).

Take care as 2.5mm coating thickness may be bordering on the coating thickness limitation.
11-12-2009, 03:36 PM,
RE: Thermal spray HVOF GLC-720 (GTV)
A twin wire arc system would be ideal for your application. There are many sources for the wires. If you need help, I have some resources to supply consumables to Russia.
11-12-2009, 07:25 PM, (This post was last modified: 11-13-2009, 04:48 AM by plasmajet1990.)
RE: Thermal spray HVOF GLC-720 (GTV)

Your problem can be resolved using SM8222 wire with arc spray.


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