Ceramic Piston Coatings: Compare Crown Protection and Skirt Friction — working record
Yenra | October 4, 2026
https://yenra.com/engines/pistons.html

Purpose: Prepare a coating comparison tied to piston location, substrate, duty cycle and relevant thermal, wear and adhesion evidence.

Instructions: Make a working copy. Fill the fields below with actual evidence and units. Record unavailable information as unknown, give it an owner, and resolve it before using the record for acceptance. Keep raw evidence by reference. Use the approved method, equipment limits and acceptance rules for your application. This blank record does not establish qualification.

1. Piston identity, alloy, drawing revision and target surface
   Response / evidence reference: ______________________________

2. Duty, lubrication, mating components and documented failure mechanism
   Response / evidence reference: ______________________________

3. Coating chemistry, preparation, bond layer, thickness and masked regions
   Response / evidence reference: ______________________________

4. Supplier-approved final dimensions, profile and installation instructions
   Response / evidence reference: ______________________________

5. Coupon method, units, controls, repeats, uncertainty and failure observations
   Response / evidence reference: ______________________________

6. Engine trial configuration, matched baseline, endpoints and stop criteria
   Response / evidence reference: ______________________________

7. Measured benefit, adverse effects and supported scope of conclusion
   Response / evidence reference: ______________________________

8. Inspection, rework disposition, approval owner and evidence references
   Response / evidence reference: ______________________________

Teaching example (fictional; not acceptance criteria):
Fictional wear-test comparison In one controlled coupon test, the uncoated reference loses 12 mg and the coated specimen loses 8 mg. The reduction in measured mass loss is (12 − 8) / 12 × 100 = 33.3%. Report the load, speed, lubricant, duration, substrate and repeat count. That result describes this wear test; fuel consumption and engine durability require their own measurements.

Primary source context (consult for applicable method and scope):
MAHLE's piston overview
https://www.mahle-aftermarket.com/na/en/products-and-services/engine-components/light-vehicle/pistons/
1995 NASA Tech Brief on combined thermal-barrier and wear coatings
https://ntrs.nasa.gov/citations/19950065378

Review outcome: accepted / held / further evidence needed
Reviewer and date: __________________
Open actions, owner and due date: __________________