Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references. Available also from UMI/Dissertation Abstracts International.

Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: Deposition rate; zirconia; TBC; texture; microstructure; EB-PVD. Includes bibliographical references (p. 78-79).

Thesis (Ph.D.)--University of Wyoming, 2007. / Title from PDF title page (viewed on June 22, 2009). Includes bibliographical references.

Thesis (Ph. D.)--Institute of Paper Chemistry, 1948. / Bibliography: leaf 70.

Thesis (Ph. D.)--Institute of Paper Chemistry, 1943. / Bibliography: leaves 130-131.

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (leaves 240-248).

Abstract This thesis work is about finding out which coating should be used for which hardened tool steel and this was done by testing different coated cutting tools in different kinds of tool steels. The thesis work is performed at Uddeholms AB together with Uddeholms AB in the department of R&D at machinability cooperating with eifeler-Vacotec GmbH. The thesis work is going on from the end of January to the start of June and is a part of the education as mechanical engineer at Karlstad University and includes a total of 22,5 hp. The objective after finished thesis work is to be able to leave a recommendation to Uddeholms AB which coating is most suitable for each tool steel. To be able to leave that recommendation cutting tests are performed in four different hardened steel grades from Uddeholms AB combined with seven different coatings from eifeler-Vacotec GmbH. Steel grades tested are NIMAX®, DIEVAR®, VANADIS® 10 and ORVAR® SUPREME and coatings tested are CROSAL®, EXXTRAL® and SISTRAL® in different compounds. ORVAR® SUPREME gave such a long cutting tool-life that it was left for further investigation due to time limits that the thesis work had. In the other three tool steels it was possible to get a recommendation out of the four coatings tested in each tool steel. The coating that is recommended for each tool steel is only based on the cutting tool lasting the longest in each tool steel. That is not how a recommendation usually is formed, however for this thesis work there is no time for checking all the aspects that is vital for a proper recommendation. In order to get a proper recommendation, further more aspects that are checked are for example: Different cutting parameters (cutting speed, feed, etc.) Different geometries on the cutting tool Smoothness of the cutting tool and the coating In table 1 there is a compilation of which coating that was recommended for which tool steel. Table 1. This is a compilation of which coating that was recommended for which tool steel. NIMAX®               CROSAL® V1 DIEVAR®             SISTRAL® Ultrafine VANADIS® 10    SISTRAL® S

published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy

Diamond thin films on Fe based materials (ferrous alloys) for the purpose of improving their surface properties such as wear and corrosion resistance have been investigated. There are main barriers restricting the quality and adhesion of diamond coatings on Fe based materials. Firstly, the incubation time of diamond nucleation is long due to the high solubility of carbon in Fe. Secondly, graphite soot forms before diamond nucleation due to the catalytic effect of Fe for formation of graphitic carbon. Thirdly, high internal stress remains at the interface which is induced by the large difference in the thermal expansion coefficients of diamond and most of the Fe based materials. Surface modification and interlayers are two important approaches to overcome these problems. In this work, the effect of Cr content in Fe-Cr alloys on diamond nucleation and growth is being studied in order to clarify the mechanisms of Cr in diamond deposition. Furthermore, in order to enhance the adhesion and quality of diamond coatings, Al based interlayers are being investigated on ferrous alloys. Fe-Cr alloys (with 20~80 wt.% Cr) were exposed to a CH4-H2 mixture in a microwave plasma enhanced chemical vapor deposition (MPCVD) reactor. Severe metal dusting and carburization were observed on the alloys with low Cr content and diamond did not nucleate on those alloys until a graphite intermediate layer had been formed, which takes a long incubation time. Increasing Cr concentration in the Fe-Cr alloys promotes the formation of a Cr carbide buffer layer, which inhibits metal dusting and the formation of graphite soot. Consequently, diamond nucleation and growth can be greatly enhanced, and continuous diamond films with enhanced adhesion have been deposited on the Fe-80Cr alloys. Al based interlayers including Al and Al/AlN interlayers were deposited on ferrous alloys (SS316 and Kovar: FeNiCo) to enhance diamond deposition. The deposition was carried out in a microwave plasma chemical vapor deposition (MPCVD) reactor using a CH4-H2 mixture. The obtained samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, synchrotron-based X-ray absorption spectroscopy (XAS) and indentation testing. The results show that a single Al layer can effectively suppress the formation of graphite at the interface and the inward diffusion of carbon into Fe based substrates, and thereby enhances diamond nucleation and growth. The dual layers of Al/AlN can further enhance the adhesion of diamond coatings comparing with the single Al interlayer.

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