Hi Shantanu
I was not going to respond as the question is a bit like comparing apples and oranges and I don't have first hand experience with rod ceramic spraying, but to balance things out a bit and talk more specifically about Rockide C chromium oxide based ceramic coating:
Around 1980 Metco developed Metco 136CP for plasma spraying. This I believe was an attempt to compete with Rockide C coatings. Below is a quote from Metco 136CP technical bulletin:
Quote:Metco 136CP provides one of the most durable plasma chromium oxide coatings in the industry. Metco 136CP has a coating thickness capability of over 0.100" (2.5mm), making it superior to coatings of Rockide C, where a thick ceramic coating is required, while having an equivalent wear resistance.
So a blanket statement "plasma coatings are best" does have a few holes in it. Rockide C coatings are still very hard to beat for applications requiring thick, tough and wear resistant ceramic coatings.