Masking of Cooling Holes
01-08-2008, 09:16 AM,
#1
Masking of Cooling Holes
Hi,

Any ideas/ thoughts on the effective way of masking the cooling holes of gas turbine nozzle segments while plasma spraying.

Regards,

Girish
Reply
01-14-2008, 03:44 PM,
#2
RE: Masking of Cooling Holes
Hi Girish

Not too sure on this, but I think these holes are not normally masked. The holes are either machined oversize to counteract reduction in size when coated or are resized after spraying.
Reply
01-20-2008, 09:34 AM,
#3
RE: Masking of Cooling Holes
Gordon Wrote:Hi Girish

Not too sure on this, but I think these holes are not normally masked. The holes are either machined oversize to counteract reduction in size when coated or are resized after spraying.

Thanks a lot Gordon. We are trying to find out a way to avoid the resizing after spraying. I thought probably a liquid masking solution will be available.

Regards,

Girish
Reply
01-20-2008, 01:09 PM,
#4
RE: Masking of Cooling Holes
Hi Girish

Problem with masking or plugging a small hole is that the coating bridges and covers the hole completely. Raising the plug above the surface level reduces this effect, but then you get shadowing problems Sad
Reply
01-20-2008, 10:09 PM,
#5
RE: Masking of Cooling Holes
Try conic washers.
What are the diameters oj the holes?

gshejale Wrote:Hi,

Any ideas/ thoughts on the effective way of masking the cooling holes of gas turbine nozzle segments while plasma spraying.

Regards,

Girish
Reply




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