Characterization of annealed pulsed laser deposited (PLD) thin films of cesium oxythiomolybdate (Cs2MoOS3)

 Cesium oxythiomolybdate (Cs₂MoOS₃) is under consideration as a high temperature solid lubricant for silicon nitride bearings .However, Cs₂MoOS₃ oxidizes below the proposed maximum use temperature of 800℃, and the oxidation process is complex. King and Asmerom were the first to use Cs₂MoOS₃ as a lubricant, and noted that Cs₂MoOS₃ changes color from its original bright red-orange to a white powder during high temperature testing, indicating a change in chemical composition .Strong et al. previously showed that oxidation of Cs₂MoOS₃ is complex, leading to a variety of products in the desired application range of 400–800 8C including: Cs₂SO₄, which further decomposes to cesium oxides and SOx gas; Cs₂MoO₄ and other complex cesium molybdates; and MoO₃. Cesium oxythiomolybdate-based lubricants have been applied by burnishing, mixing in greases, continuous powder feeding, and matrix binding. Burnished powders and applied greases need to be replenished often. Continuously supplied powders require a supply system and consume a significant amount of powder over time. Bonded coatings may exhibit poor adhesion to the substrate. A method of depositing Cs₂MoOS₃ coatings with precise thickness, good adhesion, and lubricious chemistry was desired

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