coating of Al2O3-TiO2 by HVOF

[mlavar]

Hi Dear Friends
can we apply Al2O3-Tio2(metco 130SF) by HVOF system, If OK please advice me about characteristic and parameters,
thanks

[KevGarty]

Only HVOF capable of spraying Ceramics is the Praxair HV2000 - (As far as I am aware of)

Other than that its a No No

Cheers

Kev

[mlavar]

Only HVOF capable of spraying Ceramics is the Praxair HV2000 - (As far as I am aware of)

Other than that its a No No

Cheers

Kev

Hi Dear Kev
Thanks for your advice,
we have jetkote HVOF, would you please help me for adjust parameter such as persure and flow of O2,
presure and flow of Propan,
distance,
pressure and flow of gas carrier
and etc.

regards

[KevGarty]

Sorry Mlavar,

I should have explained a bit better. The HV-2000 is an HVOF System, the only system on the market capable of spraying ceramics by HVOF.

Jet Kote cannot spray ceramics

It would have to be Plasma or Flame Spray

Thanks

Kev

[loriolo]

Hi Mlavar
As well as I try to spray ceramics with HVOF, I tried with Praxair HV2000, and Metco Dj 2700, but I did not obtained goods results, The coating was worse respect of the one I did with a powder thermal spray system, because ceramics need higher temperature even if ceramics must be only sprayed with Plasma Systems, with termal spray you can have a coating with poor result, only used for thermal protections

[Jaydev]

Hi Dear Friends
can we apply Al2O3-Tio2(metco 130SF) by HVOF system, If OK please advice me about characteristic and parameters,
thanks

Dear Al2O3-Tio2 you have two options either with Plasma spray or with Powder flame spray (equivalent to 6PII or 5PII) systems. Coating applied with plasma spray will produce best results but again higher cost is involved. Coating produced with Powder flame spray system will be much economical but some porosity will be there.

Thanks

[Met.Eng.]

We are using TopGun (Hv2000) system as fuel gas is accetylene. We can coat Pure Al2O3, 97/3, 87/13 and 60/40 AlO/TiO.
70 lt/min ace
155 lt/min oxy
30 gr /min powder
15-20 lt/min Ar
200 mm long nozzle set (9mm diamention)

[Stephen Booth]

I agree with all the above:

Top Gun = HV 2000 with acetylene is the only HVOF for Ceramics

Powder Flame torches can make a "coating" but its not in the same class of ceramics as the HVOF and of course APS

another idea is the Rokide Gun from Norton and a few other suppliers, which is relatively inexpensive, 20-25K USD (the consumables are expensive though) and it can make some very good coatings

We are using TopGun (Hv2000) system as fuel gas is accetylene. We can coat Pure Al2O3, 97/3, 87/13 and 60/40 AlO/TiO.
70 lt/min ace
155 lt/min oxy
30 gr /min powder
15-20 lt/min Ar
200 mm long nozzle set (9mm diamention)

[Coatingmate_Thomas]

The fragility of Al2O3-TiO2 series ceramic powders lead to math APS well but HVOF, because the relatively lower torch temp. and relatively higher spraying speed compared with APS, the high melt temp. ceramic powders cannot melt well and broken by impact force. At the moment, there is one way to use suspension and solution precursor HVOF spraying with dedicated powder feeder.