Years ago I called Kyocera about their recomended procedure for
sharpening their alumina zirconiaum knives and they said to return
them as it was proprietary.
I thanked them for their time and told them I would instruct my
customers to find some other brand.
FWIW a 600grit resin bond 100conc diamond wheeel works fairly well,
you do not want to breathe the dust or draw the brittle edge out too
thin.
You might be able to get a wheel no longer suitable for grinding
carbide saws from a sharpener for coffee and donuts.