Compressive strength is the ability to withstand forces that reduce volume. For WS₂, bulk compressive strength is estimated at 1-2 GPa, though data is sparse due to its primary use as a lubricant, not a structural material. This value reflects its layered structure: strong in-plane W-S bonds resist deformation, but weak interlayer forces allow buckling or shearing under load.
Nanoindentation on WS₂ films suggests higher values (~5-10 GPa) for thin layers, as confinement limits sliding. In bulk, defects and porosity (e.g., from hydrothermal synthesis) lower strength to 1-2 GPa, measured via compression tests on pellets. Compared to MoS₂ (~1-1.5 GPa), WS₂ is slightly stronger due to tungsten’s influence, but it’s far below ceramics (e.g., alumina, ~2000 MPa) or metals (e.g., steel, ~250 MPa yield).
Temperature affects strength: stable to 510°C in air, then oxidation weakens it; in inert conditions, it holds to 1250°C. Applications rarely test compressive strength directly, as WS₂ is used in thin layers or powders, relying on substrates for support. Its moderate strength suits coating roles, not load-bearing ones.
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