Cracks in WC-12Co coating |
06-19-2012, 04:34 PM
Post: #1
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Cracks in WC-12Co coating
Hi, everyone:
I have been working on spraying of WC-12Co coating for quite a long time. However, the cracks(about 0.06-0.07 mm, perpendicular to the interface) are invariably present in the cross-sections when viewed at a magnification of 200. I wonder if the cracks resulted from the spraying process or from metallographic preparation processes? The coatings are sprayed with a Metco Unicoat model sray system. | |||
06-19-2012, 09:37 PM
Post: #2
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RE: Cracks in WC-12Co coating
Hi,
if the samples preparation proceeds with correct way according to ASTM wont see cracks founded. i think that's happen because a a deferential of thermal expansion between substrate and coat materials select proper substrate with near thermal expansion of coating layer. Mustafa Metallurgical Engg. | |||
06-20-2012, 04:36 AM
Post: #3
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RE: Cracks in WC-12Co coating
Dr Tofi:
What do you mean by "sample preparation"? the spray or the metallographic preparation? What's the ASTM document? It is required the coating be sprayed on a titanium alloy. Thank you! | |||
07-19-2012, 04:25 PM
(This post was last modified: 07-19-2012 04:42 PM by Ken59.)
Post: #4
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RE: Cracks in WC-12Co coating
(06-20-2012 04:36 AM)fhyuan Wrote: Dr Tofi: Hi You can stop the cracking by with a thin layer of 5-10 mil of Ni/Cr only (80/20) on the base and the then spray the WC-12. Plus cool the part down slow,and leaving it in the spray lathe at about the same RPMs. but I was using Hvof to spray parts. | |||
07-26-2012, 04:09 PM
Post: #5
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RE: Cracks in WC-12Co coating
Hi, the drawing has it that the coating be plasma sprayed directly onto a titanium alloy substrate.
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