Amdry 956 Hardness

[Benjamin101]

Hello,

I'm new to this forum and am early in my career in thermal spray, I'm having trouble with a getting my coating to achieve a requirement so I thought id see what the people with all the experience have to say!

I am spraying Amdry 956 with a Metco F1 gun, The specification requires a Hardness of Rb80, im currently no where near, only just achieving a hardness of Rb 64. I have tried spraying test pieces with thickness' varying from 0.25mm all the way up to 2.00mm . I'm at a bit of a loss on what to do, I initially had issues with unmelts which took a while to solve, only for me to have overlooked the hardness requirement. Does anyone have any suggestions on what direction to take?

any help would be much appreciated,

Regards

Ben

[paikhuan]

Hello,

I'm new to this forum and am early in my career in thermal spray, I'm having trouble with a getting my coating to achieve a requirement so I thought id see what the people with all the experience have to say!

I am spraying Amdry 956 with a Metco F1 gun, The specification requires a Hardness of Rb80, im currently no where near, only just achieving a hardness of Rb 64. I have tried spraying test pieces with thickness' varying from 0.25mm all the way up to 2.00mm . I'm at a bit of a loss on what to do, I initially had issues with unmelts which took a while to solve, only for me to have overlooked the hardness requirement. Does anyone have any suggestions on what direction to take?

any help would be much appreciated,

Regards

Ben

Hi!!

Can you send us ur coating parameters? Metco F1? I think that, for Rockwell B, you need a minimum thickness (check that). 

Kind regards,

[Benjamin101]

Hello,

I'm new to this forum and am early in my career in thermal spray, I'm having trouble with a getting my coating to achieve a requirement so I thought id see what the people with all the experience have to say!

I am spraying Amdry 956 with a Metco F1 gun, The specification requires a Hardness of Rb80, im currently no where near, only just achieving a hardness of Rb 64. I have tried spraying test pieces with thickness' varying from 0.25mm all the way up to 2.00mm . I'm at a bit of a loss on what to do, I initially had issues with unmelts which took a while to solve, only for me to have overlooked the hardness requirement. Does anyone have any suggestions on what direction to take?

any help would be much appreciated,

Regards

Ben

Hi!!

Can you send us ur coating parameters? Metco F1? I think that, for Rockwell B, you need a minimum thickness (check that). 

Kind regards,

Hi Paikhuan,

I am getting these results even when spraying as close the the metco recommended parameters as possible, i have now also trialed with an F4 Gun with slightly improved results. I have noticed a large change in measured hardness wiith different thickness's. For example, with the same parameters, a coating sprayed to a thickness of 0.4mm provided a Rockwell B Hardness of 64, while a test peice with 0.7mm measured at 74 Rockwell B.

[paikhuan]

Hi Paikhuan,

I am getting these results even when spraying as close the the metco recommended parameters as possible, i have now also trialed with an F4 Gun with slightly improved results. I have noticed a large change in measured hardness wiith different thickness's. For example, with the same parameters, a coating sprayed to a thickness of 0.4mm provided a Rockwell B Hardness of 64, while a test peice with 0.7mm measured at 74 Rockwell B.

Hi again,

May be you can check your parameters. I think that, in this kind of coatings, density is correlated with hardness. Try with less thickness per pass (increase your mov speed) or try lowering your feeding rate.

Next movement, you can reduce your standoff distance and increase your cooling/clean. Sometimes, coating is fullfilled of bounces and unmelted particles.

Did you say F1 gun?