Cr3C2 Ni-Cr coating on Aluminium
10-16-2011, 06:55 PM,
Cr3C2 Ni-Cr coating on Aluminium
Before I coated Cr3C2 NiCr on some steel parts with gas HVOF and did not have any problem.Recently I coated that on aluminium cylender and during the test we saw creation of cracks on the coat.specially this cracks is in the section of cylender that we have termal shock(between cold and hot section).Do you have any idea?
Max temp of this cylender is 350 C.Is it possible that the thermal expantion coefisient of Aluminium and coat is too different?
10-17-2011, 06:32 AM,
RE: Cr3C2 Ni-Cr coating on Aluminium
Hello ehsan,

If I should have coat the cylinder coating, I would like to try precoat.
Aluminum has high heat conductivity.
However carbide coating material makes high tensile stress during cooling.
So ductile metallic coat is used for this case, such as Ni-Al or NiCrBSi hard facing material etc.
Because they have lower heat condcutivity than aluminum and their ductility prevents thermal stress crack.
If you want to have higher hardness, choose hard facing materials.
Or if you want to have higher ductility, choose Ni-Al materials.

10-17-2011, 06:04 PM,
RE: Cr3C2 Ni-Cr coating on Aluminium

I agree with Simon

if u do not want to carry bond coat then you have to plan your coating procedure such that the temperature raise in the substrate (Al) is below 150 degree centigrade by providing forced cooling system & carrying coating with time intervals.

10-17-2011, 07:22 PM,
RE: Cr3C2 Ni-Cr coating on Aluminium
The thermal expansion coefficients of aluminum and CrC are very different. Keep your aluminum part cool while you spray it, and you will have success. 350C is extremely hot for any coated part.
10-19-2011, 12:50 PM,
RE: Cr3C2 Ni-Cr coating on Aluminium
350C temperature is not during coating.the work temperature of parts in engine is 350C.

Possibly Related Threads…
Thread Author Replies Views Last Post
  Looking suggestion for S2B "Z" notch coating & dove tail ARC spray aluminium coating demionkrishan 0 449 06-14-2021, 02:09 PM
Last Post: demionkrishan
  Surface Preparation of Aluminium acidic 2 4,003 05-09-2015, 01:59 PM
Last Post: CHI3
  Green color with Cr3C2/Ni20Cr sal 1 3,210 04-25-2013, 12:21 PM
Last Post: Gordon
  Machining aluminium bronze hvof coating Orion 2 5,849 08-23-2012, 12:22 PM
Last Post: Orion
  coating aluminium composite panel nicubila 2 7,865 12-13-2010, 08:14 AM
Last Post: Fydor75
  Thermoconductive super-hydrophobic coating of Aluminium cyphyus 8 10,184 08-03-2010, 06:43 PM
Last Post: cyphyus
  Coating freak Off From Aluminium Eagleman 5 5,801 04-25-2010, 02:29 PM
Last Post: Gordon
Shy Cr3C2 Coating by HVOF Simon Kim 4 6,917 02-26-2010, 08:18 AM
Last Post: Florin
  Aluminium properties Yukawa 4 10,028 11-10-2009, 12:19 PM
Last Post: Yukawa
  Aluminium coating exnnerspray 5 13,512 05-06-2009, 04:42 PM
Last Post: Gordon
  aluminium coating 123raoel 3 5,296 04-21-2009, 12:47 PM
Last Post: Gordon
  Coatings for aluminium bshah 4 6,718 11-17-2008, 07:06 PM
Last Post: Gordon
  Spraying Pure Aluminium J_rock 1 4,923 08-05-2008, 02:51 PM
Last Post: Gordon
  Delamination of Aluminium Polyester Coating fhyuan 1 8,245 01-27-2008, 08:19 PM
Last Post: Gordon
  Problems with aluminium-silicon coating gasper 6 14,558 05-10-2007, 03:01 PM
Last Post: gasper

Users browsing this thread: 1 Guest(s)

Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd