Volume 8, Issue 7 (July 2011)

    Influence of Structure on Brittleness of Boron Nitride Coatings Deposited on Cemented Fine-Grained Carbides

    (Received 15 July 2010; accepted 27 May 2011)

    Published Online: 2011

    CODEN: JAIOAD

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    Abstract

    The article presents the brittleness study of boron nitride coatings deposited on cutting edges made of fine-grained cemented carbides by the pulse-plasma method (PPD). Influences of the structure (density, pores, microcracks) of coating material on the brittleness and on selected technological parameters of boron nitride formation by PPD method particularly taking into account discharge voltage on brittleness are shown. Differences between values of total average crack length ΣL, critical loads (Pk300, Pk500), and coefficients (a1(300) and a1(500)) characterized susceptibility to cracking of investigated coatings manufactured using different values of production process were defined. Results of investigations have confirmed the usefulness of Palmqvist’s method for measurement of coating susceptibility to brittle cracking.


    Author Information:

    Kupczyk, Maciej Jan
    Poznan Univ. of Technology, Institute of Mechanical Technology,

    Siwak, Piotr
    Poznan Univ. of Technology, Institute of Mechanical Technology,


    Stock #: JAI103266

    ISSN: 1546-962X

    DOI: 10.1520/JAI103266

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    Title Influence of Structure on Brittleness of Boron Nitride Coatings Deposited on Cemented Fine-Grained Carbides
    Symposium 18th IFHTSE Congress, 2010-07-26
    Committee B08