Parameters that affect the hardness of Metco 204BNS TBC

[thezombiesprayer]

Hi

Can I find out what are the parameters that will affect the macro hardness of Metco 204BNS TBC coating?
I have sprayed a coupon with microstructure to be within limits but hardness is slightly high at average of 83HR15N

Thanks

thezombiesprayer

[Gordon]

Hi thezombiesprayer

A high macro-hardness is probably an indication of higher coating density. Cutting back a little on secondary plasma gas or increasing spray distance may have the desired effect.

Make sure you have sufficient coating thickness/surface finish to ensure a true reading from your superficial Rockwell hardness test before making any parameter changes though

[thezombiesprayer]

Hi thezombiesprayer

A high macro-hardness is probably an indication of higher coating density. Cutting back a little on secondary plasma gas or increasing spray distance may have the desired effect.

Make sure you have sufficient coating thickness/surface finish to ensure a true reading from your superficial Rockwell hardness test before making any parameter changes though

Hi Gordon
Thanks for the advice! I shall give this a try with my new coupons.
I didn't have much experience with ceramic coatings, so looks like the parameters that can affect the hardness of a coating is similar to those metallic or polyester coatings. I used to tweak on the secondary gas when I deal with metallic coatings.

Thanks

thezombiesprayer