Craking problem in Al2O3+ TiO2 plasma coating
09-20-2016, 08:36 PM,
#1
Craking problem in Al2O3+ TiO2 plasma coating
Good day partners.

I have a cracking problem in a ceramic material 87- 13 Aluminium dioxide- Titanium dioxide plasma spray (Metco 7M system).
The parameters used are the next:
Standoff 4-5 in
GH Nozzle
Shaft B
Feed rate 110
Feed rate 30 gr/min
500 Amp
70 Volts
Flow 80 ( Ar) 100 psi pressure
Flow 20 (H2) 50 psi pressure

Using the attached photo, What canbe the reason of the cracking problem? it could be a coating overhating?

Regards


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Reply
09-21-2016, 03:51 AM,
#2
RE: Craking problem in Al2O3+ TiO2 plasma coating
100% sure, overheated! (apply substrate cooling, increase RPM reduce heat input per pass)
Reply
09-21-2016, 12:52 PM,
#3
RE: Craking problem in Al2O3+ TiO2 plasma coating
(09-21-2016, 03:51 AM)Joris Kraak Wrote: 100% sure, overheated! (apply substrate cooling, increase RPM reduce heat input per pass)

Thank you very muh Joris!
Reply
09-21-2016, 09:01 PM, (This post was last modified: 09-21-2016, 09:06 PM by plasmajet1990.)
#4
RE: Craking problem in Al2O3+ TiO2 plasma coating
(09-20-2016, 08:36 PM)Hector Monjardin Wrote: Good day partners.

I have a cracking problem in a ceramic material 87- 13 Aluminium dioxide- Titanium dioxide plasma spray (Metco 7M system).
The parameters used are the next:
Standoff 4-5 in
GH Nozzle
Shaft B
Feed rate 110
Feed rate 30 gr/min
500 Amp
70 Volts
Flow 80 ( Ar) 100 psi pressure
Flow 20 (H2) 50 psi pressure

Using the attached photo, What canbe the reason of the cracking problem? it could be a coating overhating?

Regards

Hi,

Is the item in the photo ground ?
It seems that the cracks did appear due the grinding process.

Ion
Reply
09-22-2016, 01:33 PM,
#5
RE: Craking problem in Al2O3+ TiO2 plasma coating

Hi,

Is the item in the photo ground ?
It seems that the cracks did appear due the grinding process.

Ion
[/quote]

Hi Ion,

The part was sandblasting and had a Ni-Al bond coat (0.002 in)
we gave the final finish only using diamond paper.
Reply




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