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        <div id="content-top1">Page 17 - ARRS - Excellent in Science 2015</div>
        <div id="content-top2">P. 17</div>
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    <pre style="white-space:pre-line"><code>Back to Index  ENGINEERING SCIENCES / Materials science and technology  17


             nanolayer Altin-based



             hard coating with a blue color









             in general, the intrinsic color of a   color concept based on the absorp-  of cutting tools used in machining
             solid materials results from the   tion and interference effects in a   of very hard and tough workpiece
             interaction of light with the free   semi-transparent thin film of AlTiN   materials. The color of a coated
             and bound electrons, while the   deposited  over  the  TiN  reflective   tool is beneficial in manufacturing
             structural color is created due to   layer (app. 100 nm thick).  colors   process since it indicates when the
             the interaction of light with phys-  of yellow, pink, violet to blue were   coating is worn out. For the design
             ical nanostructures on the surface   prepared by varying the thickness   of decorative/protective coating
             causing optical effects such as in-  of alTin in the range of 20-55 nm.   we obtained Slovenian patent (pat-
             terference, refraction or diffraction.   By this approach we developed a   ent no. 23538) and we got a golden
             in the framework of this project   alTin-based hard coating of  high-  award on the international biannu-
             we developed a bio-inspired na-                                  al fair Forma Tool.
             nolayer hard coating of blue color,   ly saturated blue color. in addition
             which was  modeled by imitating   to decorative layers we deposited         use the blue coating!
             naturally occurring nanoscale mor-  alTin/Tin nanolayered hard coat-
             phology of nacre Â¬(a nanolayered   ing which assured good tribological
             material of iridescence color with   properties of the overall coating.
             high fracture resistance and high   Such decorative/protective coating
             hardness). We designed a new     design is suitable for the protection



                                              we have implemented blue
                                              hard coating in industry and to-
                                              day, it is used in daily produc-
             Source: M. Panjan, M. KlanjĹˇÄŤek Gunde, P. Panjan, M.
             ÄŚekada. Designing the color of AlTiN hard coating   tion in more than 20 companies
             through interference effect. Surf. Coat. Technol., 2014,   in slovenia.
             vol. 254, str. 65-72


                                                                                                             d
                schematic illustration (a) and  sem                                                          AlTiNlTiN
                                                                                                             A
                  fracture cross section image (b, b
                   and c image credit: fabian heine-  a
                    mann via  wikimedia  commons)                                                               T TiNiN
                     of the structure of nacre (plates

                       are caco , glue is organic ma-
                              3
                        terial); mother of pearl (c)                                                              A AlTiNlTiN  TiNN
                                                                                                                            Ti
                         and tem cross sectional im-                                                              A AlTiNlTiN  Ti
                                                                                                                            TiNN
                                                                                                                  AlTiNlTiN
                                                                                                                  A
                                                                                                                            TiNN
                          age of our blue nanolayer                                                               AlTiNlTiN  Ti
                                                                                                                  A
                                                                                                                            Ti
                                                                                                                  A AlTiNlTiN  TiNN
                            altin/tin hard coating.   b                              c                            AlTiNlTiN  Ti
                                                                                                                            TiNN
                                                                                                                  A
                                                                                                            2
                                                                                                            20 nm0 nm
                                                                                                                            Ti
                                                                                                                  A AlTiNlTiN  TiNN</code></pre>
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