Hard coatings in the system (Ti, Al)(C, N) prepared by pyrolysis of polymeric precursor films

Jaschek, R.; ̈ssel, C. Ru

doi:10.1016/0257-8972(91)90211-e

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…Another single source precursor to approach hard Ti-Al-N coatings relies on the above-mentioned anodic dissolution on Ti and Al in amine solutions. 76 Polymeric precursor coatings were prepared by dip-coating on silica or alumina substrates followed by ceramisation under ammonia at 800-1200 1C. The powder XRD data clearly indicate the formation of films containing nanocrystalline fcc-Ti(Al)N. The coatings were up to B500 nm thick, hardness measurements showed only a slight increase compared to the hardness of the substrates, which is most likely due to the porous morphology of the films as indicated by SEM.…”

Section: 21mentioning

confidence: 99%

Interface phenomena in (super)hard nitride nanocomposites: from coatings to bulk materials

et al. 2012

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Mechanical properties of nanocomposites usually surpass the mechanical properties of their micro-structured and single-crystalline counterparts. This is mainly due to an extremely high density of internal interfaces in nanocomposites like grain, crystallite and phase boundaries. When compared to diamond, carbides and borides, nitrides are of interest because of their high temperature oxidation resistance and compatibility with iron containing alloys. This tutorial review classifies the contributions of various internal interfaces to the hardness of the nanocomposites, and appreciates the outstanding role of partially coherent phase boundaries in the hardness enhancement. With selected examples of transition metal nitrides containing aluminium and silicon as well as of boron nitrides, it is explained how the nanocomposites with partially coherent phase boundaries and thus with enhanced hardness can be synthesised. As the possible ways of the formation of coherent phase boundaries, the local epitaxial growth of phases with limited mutual solubility, the production of supersaturated solid solutions followed by the segregation of elements during the spinodal decomposition and the incomplete phase transformation are discussed. The most important techniques, used for synthesis of nitride nanocomposites, like CVD, PVD, precursor-based methods, mechanical alloying and high-pressure-high-temperature synthesis are briefly reviewed. Besides, a short overview on hardness definitions and hardness measurements is included.

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Section: 21mentioning

confidence: 99%

Interface phenomena in (super)hard nitride nanocomposites: from coatings to bulk materials

et al. 2012

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“…Such contaminants tend to degrade the electronic, thermal, and mechanical properties of the materials. Some other approaches to metal nitride powder synthesis are transferred-arc plasma synthesis, aerosol reactor synthesis, direct reaction of the metal halide with liquid NH 3 , and anodic dissolution of themetal in an organic amine solution. − The latter two techniques are closely related to the strategy we describe here.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Synthesis of Ceramic Materials. 5. An Electrochemical Method Suitable for the Preparation of Nine Metal Nitrides

1997

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We discuss an electrochemical approach suitable for preparing nine metal nitride precursors and the corresponding metal nitrides. The method involves anodic dissolution of a metal electrode in a single-compartment electrochemical cell containing an electrolyte solution consisting of liquid NH 3 and NH 4 X (X ) Br or Cl). Following evaporation of the solvent and calcination of the resulting powder at temperatures between 375 and 1100°C, we obtain the metal nitride corresponding to the anode material. Using this approach metal nitride ceramic powders corresponding to Al, Ga, Mo, Nb, Ni, Ti, V, W, and Zr have been prepared. We also describe a simple modification to the metal nitride synthesis that is suitable for the preparation of composite metal nitride powders. The ceramic materials were characterized primarily by powder X-ray diffraction. The calcination conditions determine the resulting phase, composition, and morphology of the product. For example, when Ar is used to calcine the Mo nitride precursor Mo 2 N obtains, but when NH 3 is the calcination gas we obtain MoN. Calcination of the precursors at different temperatures results in ceramic powders having different phases.

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An electrochemically prepared precursor for the formation of tantalum carbide

Zahneisen

Rüssel

1994

J Mater Sci Lett

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Hard coatings in the system (Ti, Al)(C, N) prepared by pyrolysis of polymeric precursor films

Cited by 7 publications

References 3 publications

Interface phenomena in (super)hard nitride nanocomposites: from coatings to bulk materials

Interface phenomena in (super)hard nitride nanocomposites: from coatings to bulk materials

Electrochemical Synthesis of Ceramic Materials. 5. An Electrochemical Method Suitable for the Preparation of Nine Metal Nitrides

An electrochemically prepared precursor for the formation of tantalum carbide

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