45VFNS

[Laurent]

Hi Gordon,
We have currently an application of the following:
450NS as a bond thickness 0.10 to 0.15mm
45VFNS total thickness of 0.21 to 0.29mm
Base metal is stainless steel thickness 0.8mm
Such part is used as a air force jet adjustable exhaust flaps.

Could you please confirm whether 45VFNS (which is also used as a bond) could be applied with no primary 450NS bond coating?

It appears that our powder regulator went down and both powder selection went wrong, therefore 45VFNS only has been applied.
Final thickness of 45VFNS is of 0.30mm.

Could you also confirm traction and abrasion values if known?

Thanks for your kind help
Laurent

[Gordon]

Hi Laurent

Could you please confirm whether 45VFNS (which is also used as a bond) could be applied with no primary 450NS bond coating?

45VFNS can be used without a bond coat. It is designed for very thin coatings (max 0.4mm). Metco 45C-NS can be used as a base coat to extend coating thickness limitation.

It appears that our powder regulator went down and both powder selection went wrong, therefore 45VFNS only has been applied.
Final thickness of 45VFNS is of 0.30mm.

Considering the part I would expect the coating to be covered by aerospace specifications/procedures and traceability. I would highly doubt this deviation would be allowed even if technically thought to be OK.

[Laurent]

Hi Laurent

Could you please confirm whether 45VFNS (which is also used as a bond) could be applied with no primary 450NS bond coating?

45VFNS can be used without a bond coat. It is designed for very thin coatings (max 0.4mm). Metco 45C-NS can be used as a base coat to extend coating thickness limitation.

It appears that our powder regulator went down and both powder selection went wrong, therefore 45VFNS only has been applied.
Final thickness of 45VFNS is of 0.30mm.

Considering the part I would expect the coating to be covered by aerospace specifications/procedures and traceability. I would highly doubt this deviation would be allowed even if technically thought to be OK.

Thanks very much
Let think that decision should be more political than technical
Thanks

[derek]

In aircraft engine repair industry, we use 450NS + 45VFNS to gain the thickness without post machining, the roughness of as spray is in the Spec. If the part doesn’t need good surface finish, use 45C-NS to build the coating thickness.

[Laurent]

In aircraft engine repair industry, we use 450NS + 45VFNS to gain the thickness without post machining, the roughness of as spray is in the Spec. If the part doesn’t need good surface finish, use 45C-NS to build the coating thickness.

Hi Derek
Thanks for your feedback.
We have a meeting today on the subject. I guess we should be able to deviate.
Thanks