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You can get tungsten carbide discs... use those and go silicon carbide for the DPF. Tungsten is awesome so good to get it in there somewhere :)

Have you expanded your search to ceramics used in the manufacturing process, rather than just the content in the end product? For example ceramic cores used for casting alloys. If that's not allowed, then there are a few ceramics in lithium batteries - can you go hybrid? :)