CVD coating Ni-TiN-Al2O3

Hi everybody,
Please share experience on:
Can I coat Al2O3 on top of TiN coated Ni substrate?
I tried two times and the result looked completely bad.
My problem is that at the same time I am not sure if my machine is
working correctly or not. So I could not decide, was it because of the
machine or because of the difficulties for such coatings.
Thnx alot & bstrgds
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