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




Possibly Related Threads…
Thread Author Replies Views Last Post
  Masking tape or compounds suggestion texnicar 5 6,908 02-05-2021, 09:07 PM
Last Post: jtonic77
  HVAF Masking TimHewitt1 3 2,925 12-11-2019, 06:45 PM
Last Post: JJStick
  Nitrogen Cooling Neufeld 2 1,544 08-20-2019, 11:40 AM
Last Post: loriolo
  Need help with masking materials search Artyom 2 1,528 04-20-2019, 07:18 AM
Last Post: loriolo
  Plasma Spray Masking Tape achmadarifudinh 2 1,808 09-06-2018, 02:48 AM
Last Post: achmadarifudinh
  Part shrinkage after cooling down. Rage2371 5 2,493 06-14-2018, 09:42 PM
Last Post: KevGarty
  opening blocked cooling holes in Stage 1 gas turbine blades Gustavo Woltmann 1 1,958 03-07-2017, 08:27 AM
Last Post: loriolo
  opening blocked cooling holes in Stage 1 gas turbine blades demionkrishan 1 2,141 03-04-2017, 07:44 AM
Last Post: loriolo
  HVOF masking demionkrishan 2 3,543 01-15-2016, 02:29 PM
Last Post: demionkrishan
  Reg: Cooling process. Dileep 2 3,460 10-16-2015, 01:05 AM
Last Post: Johnny_Blaze
  HVOF masking Kopi81 9 9,738 04-09-2015, 09:01 PM
Last Post: giuiori75
  plasma hard masking vendors CHI3 2 4,637 03-16-2015, 03:20 AM
Last Post: Meeker77
  pin holes on the surface of PTA overlay raviswanadha 0 2,286 06-21-2014, 04:04 PM
Last Post: raviswanadha
  hvof cooling kschewe 0 2,826 07-16-2012, 06:10 AM
Last Post: kschewe
  3MB gun air cooling Azraf Saip 1 3,224 10-21-2011, 09:15 PM
Last Post: LEN WOOD



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd