HVOF coatings on inside diameters down to 8 cm [split]
01-17-2009, 10:52 PM, (This post was last modified: 01-17-2009, 10:54 PM by SteelDryver.)
#1
HVOF coatings on inside diameters down to 8 cm [split]
We can do HVOF coatings on inside diameters down to 8 cm (what is that? 3.2 inches) up to 1.5 meters deep. Smile

Steeldryver

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01-18-2009, 07:57 PM,
#2
RE: HVOF coatings on inside diameters down to 8 cm
Hi SteelDryver

Quote:We can do HVOF coatings on inside diameters down to 8 cm (what is that? 3.2 inches) up to 1.5 meters deep. Smile

Are you sure? I would be interested in how this is done. I seriously doubt whether it would be able to apply refractiry ceramic type coating suitable for molten aluminium resistance. I hope I think wrongly Smile

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01-18-2009, 08:34 PM,
#3
RE: HVOF coatings on inside diameters down to 8 cm
I know it's difficult to believe. Tell me where or how I could post some infos (pdf or powerpoint). I'd love to show you how we do ID HVOF (and now it gets even more difficult to believe) without overheating the substrate.

regards, Steeldryver

(01-18-2009, 07:57 PM)Gordon Wrote: Hi SteelDryver

Quote:We can do HVOF coatings on inside diameters down to 8 cm (what is that? 3.2 inches) up to 1.5 meters deep. Smile

Are you sure? I would be interested in how this is done. I seriously doubt whether it would be able to apply refractiry ceramic type coating suitable for molten aluminium resistance. I hope I think wrongly Smile

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01-18-2009, 09:05 PM,
#4
RE: HVOF coatings on inside diameters down to 8 cm
Hi SteelDryver

Quote:I know it's difficult to believe. Tell me where or how I could post some infos (pdf or powerpoint). I'd love to show you how we do ID HVOF (and now it gets even more difficult to believe) without overheating the substrate.

You can make a pdf attachment in your posts (1024 KB max) in the same way as attaching images Smile

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01-18-2009, 09:21 PM,
#5
RE: HVOF coatings on inside diameters down to 8 cm
(01-18-2009, 09:05 PM)Gordon Wrote: Hi SteelDryver

Quote:I know it's difficult to believe. Tell me where or how I could post some infos (pdf or powerpoint). I'd love to show you how we do ID HVOF (and now it gets even more difficult to believe) without overheating the substrate.

You can make a pdf attachment in your posts (1024 KB max) in the same way as attaching images Smile

Hi Gordon,

attached is a paper in relatively poor english. But it does describe the procedure pretty well. Some bedtime reading.Happy0193

SteelDryver

.pdf   ID CoolFlow.pdf (Size: 138.54 KB / Downloads: 6,153)

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01-18-2009, 09:55 PM,
#6
RE: HVOF coatings on inside diameters down to 8 cm
Hi SteelDryver

Thanks for posting article Cheers very interesting. I will take a little more time to digest. I still doubt its use in this particular application, but I think its certainly more than worthy for discussion in a new thread. When I have more time, I will create a new thread containing these recent posts, if you don't mind, so as not to go too off topic here.

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01-19-2009, 01:16 PM,
#7
RE: HVOF coatings on inside diameters down to 8 cm [split]
Hi SteelDryver

Apart from the potential overheating aspect, my main concern was with the very much shortened stand off/spray distance particularly inside a 8 cm hole, once you have the gun down there it can't leave much room to play with, even with an angled spray stream Smile
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01-19-2009, 08:56 PM,
#8
RE: HVOF coatings on inside diameters down to 8 cm [split]
(01-19-2009, 01:16 PM)Gordon Wrote: Hi SteelDryver

Apart from the potential overheating aspect, my main concern was with the very much shortened stand off/spray distance particularly inside a 8 cm hole, once you have the gun down there it can't leave much room to play with, even with an angled spray stream Smile

Hi Gordon,

your absolutely right! 8 cm is really tight. There are several tricks:
trick 1. low power (less than 20kW)
trick 2. complete combustion within the chamber

tricks 1+2 reduce overheating

trick 3 use very fine powders (2-15 microns)
the small particles accelerate more rapidly in the short distance

I run into this kind of disbelief all the time. How about giving me a fighting chance to prove it?

regards, Steeldryver
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01-20-2009, 03:38 AM,
#9
RE: HVOF coatings on inside diameters down to 8 cm [split]
Hi SteelDryver

(01-19-2009, 08:56 PM)SteelDryver Wrote:
(01-19-2009, 01:16 PM)Gordon Wrote: Hi SteelDryver

Apart from the potential overheating aspect, my main concern was with the very much shortened stand off/spray distance particularly inside a 8 cm hole, once you have the gun down there it can't leave much room to play with, even with an angled spray stream Smile

Hi Gordon,

your absolutely right! 8 cm is really tight. There are several tricks:
trick 1. low power (less than 20kW)
trick 2. complete combustion within the chamber

tricks 1+2 reduce overheating

trick 3 use very fine powders (2-15 microns)
the small particles accelerate more rapidly in the short distance

I run into this kind of disbelief all the time. How about giving me a fighting chance to prove it?

regards, Steeldryver

On the contrary, I do believe you Smile I think it is a really good and useful development. Your tricks 1, 2, & 3 answer my original question very well and make sense.Sign0013 if I was playing devil's advocate, really my disbelief was really concern with spraying oxide ceramic coatings suitable for molten aluminium applications. Standard HVOF has problems enough spraying oxide ceramics (though some do with excellent quality at a cost).

Probably playing devil's advocate again Happy0193, assuming 80mm bore, would you consider this to be HVOF (velocity wise not equipment)? as spray distance/particle dwell time is so limited and would require some spectacular particle acceleration/heating. Don't get me wrong, I'm being a bit pedantic Smile. I've seen plasma spraying of bores ~ 45 mm with spray distances ~ 10mm, while the coatings seem totally different to standard plasma spray, they none the less proved adequate for the particular task. Though I think your HVOF process will produce very different coatings to standard HVOF in very small bores, for the right application it could fill that gap and be a winner Smile
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10-28-2014, 08:00 AM,
#10
RE: HVOF coatings on inside diameters down to 8 cm
PLS look
https://www.youtube.com/watch?v=0pDtWIIJCOM

Reply
12-23-2014, 08:54 AM,
#11
RE: HVOF coatings on inside diameters down to 8 cm [split]
(01-20-2009, 03:38 AM)Gordon Wrote: Hi SteelDryver

(01-19-2009, 08:56 PM)SteelDryver Wrote:
(01-19-2009, 01:16 PM)Gordon Wrote: Hi SteelDryver

Apart from the potential overheating aspect, my main concern was with the very much shortened stand off/spray distance particularly inside a 8 cm hole, once you have the gun down there it can't leave much room to play with, even with an angled spray stream Smile

Hi Gordon,

your absolutely right! 8 cm is really tight. There are several tricks:
trick 1. low power (less than 20kW)
trick 2. complete combustion within the chamber

tricks 1+2 reduce overheating

trick 3 use very fine powders (2-15 microns)
the small particles accelerate more rapidly in the short distance

I run into this kind of disbelief all the time. How about giving me a fighting chance to prove it?

regards, Steeldryver

On the contrary, I do believe you Smile I think it is a really good and useful development. Your tricks 1, 2, & 3 answer my original question very well and make sense.Sign0013 if I was playing devil's advocate, really my disbelief was really concern with spraying oxide ceramic coatings suitable for molten aluminium applications. Standard HVOF has problems enough spraying oxide ceramics (though some do with excellent quality at a cost).

Probably playing devil's advocate again Happy0193, assuming 80mm bore, would you consider this to be HVOF (velocity wise not equipment)? as spray distance/particle dwell time is so limited and would require some spectacular particle acceleration/heating. Don't get me wrong, I'm being a bit pedantic Smile. I've seen plasma spraying of bores ~ 45 mm with spray distances ~ 10mm, while the coatings seem totally different to standard plasma spray, they none the less proved adequate for the particular task. Though I think your HVOF process will produce very different coatings to standard HVOF in very small bores, for the right application it could fill that gap and be a winner Smile

https://www.youtube.com/watch?v=0pDtWIIJCOM
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01-14-2015, 06:53 AM,
#12
RE: HVOF coatings on inside diameters down to 8 cm [split]
I believe on high-pressure HVOF designs.
Reply




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