20-02-2020 дата публикации
Номер: US20200055725A1
Принадлежит:
The present invention is directed to the synthesis of metallic nickel-molybdenum-tungsten films and coatings with direct current sputter deposition, which results in fully-dense crystallographically textured films that are filled with nano-scale faults and twins. The as-deposited films exhibit linear-elastic mechanical behavior and tensile strengths above 2.5 GPa, which is unprecedented for materials that are compatible with wafer-level device fabrication processes. The ultra-high strength is attributed to a combination of solid solution strengthening and the presence of the dense nano-scale faults and twins. These films also possess excellent thermal and mechanical stability, high density, low CTE, and electrical properties that are attractive for next generation metal MEMS applications. Deposited as coatings these films provide protection against friction and wear. The as-deposited films can also be heat treated to modify the internal microstructure and attendant mechanical properties in a way that provides a desired balance of strength and toughness. 1. A film comprising:an alloy of nickel (Ni), molybdenum (Mo), tungsten (W) (Ni—Mo—W) having very high predetermined tensile strength, thermal and mechanical stability of predetermined levels, predetermined high density, predetermined low CTE, predetermined electrical properties that are similar to the bulk alloy, and a structure of nano-scale stacking faults and twins lying in a plane of the film; andwherein the alloy is deposited as a coating or freestanding thin film or device.2. The film of wherein the deposition of the alloy is achieved with direct current sputter deposition.3. The film of further comprising a crystallographic structure possessing a predetermined strong <111> crystallographic texture and a predetermined high density of nano-scale planar defects (stacking faults and twins) oriented in the plane of the film.4. The film of further comprising a tensile strength of above 2.5 GPa.5. The film of that ...
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