Guides / Materials

When the Honest Answer Is Do Not Use a Ceramic Part

June 18, 2026

We are a matching service for ceramic parts, so recommending against a ceramic part costs us the job. We do it regularly anyway, because the alternative is a buyer who paid three times more for a part that then chipped on assembly.

Here is the test we apply.

The question that settles most cases

Is the problem at the surface, or through the part?

A surface problem means wear, friction, galling or surface corrosion on an otherwise sound metal part. Coatings solve surface problems well and cheaply.

A through problem means the material itself is wrong: it conducts when it should insulate, it softens at temperature, it corrodes through, it is magnetic, or it contaminates the product. No coating fixes those, and a ceramic part does.

What the coating options actually do

Option	Good at	Limits
Hard chrome plating	Cheap wear surface on shafts and rods, repairable	Cracks and porosity, environmental restrictions, limited corrosion protection
Nitriding and carburising	Hard surface with a tough core, no added layer to spall	Case depth limits, distortion, needs a suitable steel
Thermal spray, including ceramic coatings	Thick wear layers, large areas, on site repair	Porosity, bond strength, edges and internal features are hard to reach
HVOF carbide coatings	Excellent abrasion resistance, dense layers	Line of sight process, costly, thickness limits
PVD and CVD hard coatings	Thin, precise, low friction, dimensionally stable	Microns thick, so they follow substrate wear rather than replacing it
Solid ceramic part	Bulk properties: insulation, temperature, chemistry, stiffness, purity	Brittle, no repair path, longer lead time, higher piece price

When ceramic is genuinely the right answer

• The part must insulate electrically while doing a mechanical job
• The part runs above the temperature the metal tolerates, roughly 500 degrees C and up
• The chemistry attacks the substrate, not just the surface
• The part must be non magnetic or must not shed metal ions into the product
• Stiffness is the requirement, since ceramics are far stiffer than the metals they replace
• The wear is severe and continuous, so a coating would need constant reapplication
• The application demands high purity, for example semiconductor and medical work

When a coated metal part wins

• Impact is present, in any amount
• The part carries threads, fine features or complex geometry
• The part is large, where ceramic cost scales badly
• The part needs to be repairable rather than replaceable
• The schedule is short, because coated metal parts move in days
• The failure is friction or galling rather than abrasion

The third option people forget

A hybrid. A metal part with a ceramic insert at the wear point gives you the ceramic surface and the metal structure, threads and toughness. It is usually cheaper than a full ceramic part, easier to assemble and far less likely to break in service. This is the standard pattern in energy service, described in ceramic parts in energy, oil and gas.

How to decide in one meeting

1. Write down the failure. Surface or through?
2. If surface only, price a coating first and ceramic second
3. If through, price a ceramic insert in a metal carrier before a full ceramic part
4. If the part is struck, loaded off axis or handled roughly, weight the decision towards metal
5. If it is none of the above and the duty is chemical, hot or electrical, ceramic is probably right

The material comparison table is on materials compared, and the wear specific version is in ceramic, carbide or hardened steel.

Describe the part and the failure. If a ceramic part is the right answer we match you with up to 3 shops. If it is not, we will say so. Reply within 24 business hours.

Frequently asked questions

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