Surface Roughness
02-27-2009, 08:17 PM,
Surface Roughness

This is Prashanth. I'm one of the newest users of the forum. I have a question to the community about Surface finish. Can anyone tell me the possible ways to increase the as-sprayed coating roughness? We want the roughness to be min 250 Ra microinch but are getting only 200. The coating is NiCrAlY sprayed using HVOF system

Thank you.
03-01-2009, 06:52 PM,
RE: Surface Roughness
Hi Prashanth

Sign0016 to the Surface Engineering Forum.

One factor that will influence the as sprayed surface texture is the powder product.

Making the surface texture rougher by changing spraying parameters will tend to degrade the properties of the coating. Depending on the thickness of your coating, the roughness of the grit blast preparation may influence final coating texture.

Is the rougher coating wanted for better adhesion for a top coat ie a bond/base coat? I would be inclined to look for an alternative powder product that naturally gives a slightly coarser texture (coarser or wider particle size distribution).
03-03-2009, 11:32 AM,
RE: Surface Roughness
Hi Prasanth,

Welcome to surface engineering forum,

What is the particle size of NiCrAly powder?

Possibly Related Threads…
Thread Author Replies Views Last Post
  roller surface high roughness Tungsten carbide coating Ra 0.15-0.3mm zhuminkun 6 3,382 02-08-2019, 04:59 AM
Last Post: Taz
  Coating surface roughness William 9 22,940 12-26-2017, 10:40 AM
Last Post: Vadim Verlotski
  Copper wire arc spray surface roughness operator 10 8,865 09-10-2013, 09:06 AM
Last Post: Esteban
  Surface roughness after grit blasting Leanne 8 24,032 08-15-2012, 05:28 AM
Last Post: Leanne
  Diamalloy 2004 surface roughness problem Khairul Anwar 1 4,768 07-12-2011, 10:10 AM
Last Post: Gordon
Star Improving Surface Roughness of Polypropylene and Measuring Surface Roughness kat.rawlings 14 24,509 03-01-2011, 09:18 AM
Last Post: kat.rawlings
  Obtaining surface roughness requirement (and hardness > 1000 HV) vrakpant 3 6,458 04-25-2010, 01:37 PM
Last Post: Gordon
  Porous Machined Surface on Part Lower Inner Diameter on Inco 718 Coating Surface Alexangel1226 4 7,829 03-19-2008, 02:05 PM
Last Post: Gordon
  Ideal Surface Roughness ruskasinthehouse 2 6,094 05-05-2007, 09:44 AM
Last Post: drramc
  Surface roughness TBC topcoat Rogier 2 6,636 04-11-2007, 11:31 AM
Last Post: Rogier

Users browsing this thread: 1 Guest(s)

Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd