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SurfTech 4253

SurfTech 4253 B4C / MoS2 Coating

Name: SurfTech 4253 B4C / MoS2 Coating
Brand: SurfTech

Boron carbide with molybdenum disulfide. Gray / silver finish.

A multi-layer film that pairs a boron carbide structure with a molybdenum disulfide lubricating phase. Hard underneath, slippery on the surface, and interlaced so the behavior stays the same as the film wears.

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Boron carbide with molybdenum disulfide

The carbide phase carries the contact load. The disulfide phase shears in preference to the joint and keeps the coefficient of friction down. Because SurfTech interlaces the two rather than stacking them, a worn film exposes the same combination of materials as a new one.

Hard substructure carries the load
Lubricating phase drops friction and adhesive wear
Runs where flood coolant is restricted
Interlaced layers keep performance stable as the film wears

Plated hex bolts, nuts and washers scattered on a white surface — 4000 series work

Typical figures for B4C / MoS2

Chemistry: Boron carbide with molybdenum disulfide
Appearance: Gray / silver
Hardness: 2,500 to 3,200 HV in the carbide phase
Coefficient of friction: 0.05 to 0.12 dry against steel
Maximum service temperature: 660 °F / 350 °C in air
Typical film thickness: 1 to 3 µm
Deposition temperature: Below 200 °F

These are published typical ranges for the B4C / MoS2 material system. They describe the chemistry. The certified figure for your substrate, geometry and duty comes from the SurfTech data sheet, which is issued with the quote.

Typical applications

Galling prone stainless and titanium
Threaded and press fit assemblies
Forming tools running dry or near dry
Aluminum and copper machining

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Substrate, hardness, the tolerance you have to hold and the surfaces that stay uncoated. SurfTech confirms whether SurfTech 4253 is the right code before the job is booked.

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