- I am depositing chromium on glass through thermal evaporation then going to deposit Titanium on chromium through same technique (thermal evaporation), now i wanted to know would it give me golden shade on glass or not ? If not what should i do to get golden shade on glass through thermal evaporation.
- 1.) And if it would give golden shade,what should be substrate temperature and vacuum chamber temperature and vacuum chamber pressure?
- 2.) What other parameters do i need to fulfill to get the required golden shade ?
- My vacuum chamber size is 3ft*4ft.
If I understand your requirement of a coating which appears golden shade on glass.
1) I don't think it is possible with evaporation.
2) You don't need chromium coating at all.
3) Golden colored shade coatings (like on watches/spoons, tea cups) are obtained by depositing Titanium nitride (TiN) coatings. This is achieved by sputtering Titanium in Ar+ N2 gas ambient, and you have to control the nitrogen percentage in the sputtering gas carefully. and you can achieve beautiful golden colored shade coatings.
Hello Raghav,
Sorry for my late answer. I agree with Mr. Sreenivas that TiN is the coating that will give you the golden shade to the substrate. The best and easiest method is sputtering. For that you just need a titanium target, argon as a background gas (to get the titanium atoms from the target) and N2 or NH3 (better with N2 since it's less toxic and more pure). All that in a classic sputter coater.
Concerning the substrate temperature it depends on your coating application because as you know, increasing the temperature also increases the deposition rate and enhances the film crystal structure.
You will have to control the nitrogen flux and all possible leakages because you might risk forming nitride oxides (Ti-N-O/Ti-O-N) instead of titanium nitride (Ti-N). When you are sure that you have a good vacuum, you need a medium nitrogen flux (not so low because you only obtain the oxidized titanium nitride but not so high because you risk the collisions in the plasma phase at high pressures and your TiN deposits on the chamber walls instead of on your substrate).
Good luck and feel free to ask if you have more questions
Regards
Loraine
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