Sliding. Abrasion.
Erosion. Galling.
Wear-resistant.
Material selection for wear-resistant applications. Hardness, surface treatments, lubrication all matter. Different wear modes need different materials.
Key principles.
D2, A2 60 HRC
Hardened tool steel 58-62 HRC. Standard wear surface.
High temperature wear
Wear at high temperature. Aerospace turbines.
Coating
Cobalt-chromium hardfacing. Extreme wear applications.
Highest wear
Alumina, zirconia ceramic for ultimate wear.
Cutting tools
WC-Co cermet for cutting tools, wear plates.
Surface treatment
Hard chrome 25-50 µm coating. 70+ HV.
Surface treatment
Nitrided surface 60+ HRC. Good fatigue + wear.
Plastic wear
UHMW excellent abrasive wear resistance.
Self-lubricating
Sintered bronze with embedded lubricant.
FAQ
Hardness vs wear resistance?
Generally correlated. Hardness > 60 HRC for good metal-on-metal wear.
Adhesive vs abrasive wear?
Adhesive: cold welding, galling. Abrasive: third body wear (sand, dust). Different materials suited.
Galling prevention?
Hardness mismatch (one hard, one soft). Different alloys (avoid stainless-stainless). Surface coatings.
Lubrication or self-lubricating?
Active lubrication: oils, greases, dry films. Self-lubricating: Oilite bronze, UHMW, PTFE.
Surface treatments?
Nitriding, carburizing, hard chrome, nickel boron, DLC. Each for specific applications.
Replacement vs wear-resistance?
Sometimes cheaper to replace wear part frequently. Calculate total cost over service life.
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