Why ceramics, which are evienspxe and brittle? Why not nylons and polymers, which are already extensively used in the firearms field for receivers. Knives need to be ultra sharp and hard. Firearms receivers are better served from lighter materials that are much more forgiving and durable."Strong" means all kinds of different things.You need to look at tensile strength, sheer strength, toughness, ductility, hardness, and durability.