I am witness to some research involving another ceramic material that is widely used commercially. The idea is to back up the ceramic with something that will prevent it from blowing out the back. The ceramic grinds the bullet up while the backing stops the momentum.
This backing could theoretically consist of plastics, aluminum or plywood.
It is amazing to see what windshield of car will do to most bullets. Even though a bullet might penetrate the windshield it loses a lot of its structure making its way through.