88WC-12Co HVOF coating H2 contact

[Hector Monjardin]

Good afternoon partners,

I have a question, Does any one have experience or know something about the interaction of a thermal spray coating 88 WC-12Co HVOF with Hydrogen (H2) and natural gas at approximately 150 celcius?? Is there a posibility of a chemical reaction??

I read something of mechanical seals and the WC-Ni materials have good performance, what do you think??

Regards.

Héctor Monjardin

[Vadim Verlotski]

(10-17-2016 09:51 PM)Hector Monjardin Wrote:  Good afternoon partners,

I have a question, Does any one have experience or know something about the interaction of a thermal spray coating 88 WC-12Co HVOF with Hydrogen (H2) and natural gas at approximately 150 celcius?? Is there a posibility of a chemical reaction??

I read something of mechanical seals and the WC-Ni materials have good performance, what do you think??

Regards.

Héctor Monjardin

Hi Hector,
There is no reaction between WC-Co, WC-Ni and hydrogen or natural gas also at much higher temperatures than 150°C. Conversely, all of components (tungsten carbide, nickel and cobalt) "like" H2 and CH4, because by these gases, oxides of cobalt, nickel and tungsten can be revert to WC and metallic nickel or cobalt at high temperatures (> 800°C):

WO3 + CH4 + H2 = WC + 3H2O
Co(Ni)O + H2 = Co(Ni) + H2O
Co(Ni)O + CH4 = Co(Ni) + CO + 2H2 (Carbides of cobalt and nickel are not thermodynamically stable)

Regards
Vadim