ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The use of the tungsten imido/amido complex (N-H-t-Bu)2W(N-t-Bu)2 (Complex 1) (CAS number 72207-45-5) as a precursor to tungsten and tungsten nitride films, coatings and powders is reported. The alkane-soluble Complex 1 exhibits high solubility in solvents such as hexane and toluene, making it amenable to application to substrates via dip-coating or spotspraying. This avoids the necessity of vapour deposition methods and the, presently common, use of tungsten fluorides. Thermolysis in an ammonia/nitrogen, ammonia/argon or exclusively nitrogen atmosphere at temperatures between 600 and 1200°C provided a coating or powder comprised of elemental tungsten (75–95 mol%) and tungsten nitride (25-5 mol%). Oxygen content of these materials is less than 0.5%. Thermolysis in an argon atmosphere produced a coating on AIN substrates which were found to contain no β-W2N (as detectable by X-ray diffraction), only tungsten metal. The coating was successfully applied to sintered aluminium nitride electronic and structural substrates. A coated aluminium nitride substrate exhibited improvement in erosion resistance when compared to an uncoated specimen.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00540699
Permalink
