Ceramics for milling are awesome.
My experience was with A286. I took a roughing operation with carbide from 45 minutes to 45 seconds. 6000sfm, 11700rpms on a 2" cutter, feeds well over 200ipm. Its nasty, noisy, fire flying everywhere, its just violent.
I was running Kennatmetal KY2100's, I think that's what they were.
The thing with ceramics, everything is backasswards. If your blowing out a carbide insert, you slow it down, with ceramics, you speed it up. With carbide, you turn faster than you mill, with ceramics, you mill faster than you turn.
Its all about heat, ceramic doesn't actually "cut", it relies on heat. Most of your insert wear is going to happen on entering the cut, no heat yet. It basically plasticizes the metal, and then wipes it away. Too slow, the metal isn't hot enough, the insert isn't hot enough, total destruction. Too fast metal becomes liquid and everything goes to total shit.
Successful Application Of Ceramic Inserts : Modern Machine Shop
Here's a good article that helped me out.
What are you running this on, you really need a machine that can keep up. If it can't there's really no point. There are a metric shitload of forces involved. Thankfully I didn't have to pay for my ceramic adventure, it was a $13k spindle. 23k hours on it, they said it was time, but I'm pretty sure it was the ceramic adventure that put it over the edge.