Definition
A surface-hardening process in which steel parts are heated in an atmosphere of ammonia gas, allowing nitrogen to diffuse into the surface and form hard nitride compounds. The result is an extremely hard, wear-resistant outer layer while the core of the part remains tough and ductile. Used on aircraft engine cylinder walls, crankshafts, and other high-wear components.
Plain English
Nitriding is a way of making the outside of a steel part very hard so it doesn't wear out, while keeping the inside strong and not brittle. The part is heated in a special gas that puts a tough skin on the metal.
Context Anchor
Seen in aircraft engine maintenance, overhaul, and manufacturing discussions for steel parts that need a hard, wear-resistant surface.
Derivation
From 'nitrogen' — the element driven into the steel during the process. The '-ing' ending makes it the name of the process: putting nitrogen into the metal.
Why Pilots Care
Increases fatigue strength and wear resistance of critical rotating engine parts, extending overhaul intervals and improving reliability.
Intuition Check
Nitriding is not a paint, coating, or plating added on top of the part. It is a treatment that changes the surface of the steel itself.
Example Sentence 1
The crankshaft journals were nitrided at the factory to resist wear from the bearings.
Example Sentence 2
Nitriding the cam lobes allows them to withstand constant contact with the lifters without rapid deterioration.