TAILIEUCHUNG - Surface Engineering of Metals - Principles, Equipment and Technologies Part 10

Tham khảo tài liệu 'surface engineering of metals - principles, equipment and technologies part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Table Effect of implantation on microhardness and tribological properties of PB102 phosphor bronze From Saritas S. et al. 106 . With permission from Elsevier Science. Implanted ions Ion energy keV Ion dose ions cm2 Microhardness HV Implantation depth m Initial coefficient of friction Wear after 500 m sliding distance under 10 N load 10 -4cm3 No implantation - - 178-10 oxide B 40 5 10 17 284-10 C 20 1 10 17 183-7 N 20 1 10 17 207-4 40 1 10 17 not measured - 40 5 10 17 218-6 P 40 5 10 17 269-10 Fig. Effect of sliding distance in pin-on-disk rubbing pair on coefficient of friction of stainless steel not implanted and implanted by C Ti and N ions. A low coefficient of friction is exhibited by steel implanted with tin or molybdenum and subsequently by sulfur Table . Implantation with nitrogen of TiN coatings increases their wear resistance 109 and it has a similar effect on TiB coatings 110 . Alloying with molybdenum or cobalt of coatings implanted by nitrogen causes improvement of lubricity 4 . The depth to which the properties of the implanted material are modified which may be likened to the thickness of the implanted layer is not great. In an extreme case it reaches 1 m. On steels it usually does not exceed to m. However despite a really thin initial thickness it practically averages values greater by a factor one to two orders of magnitude during the process of abrasive wear due to 1999 by CRC Press LLC Fig. Migration of nitrogen into 440B steel during abrasive wear test. From Wolf . 70 . With permission. Fig. Initial implantation profile a and its migration b during abrasive wear test of WC-Co tungsten carbide - 8 Co alloy and Ti-6Al-4V titanium alloy implanted by nitrogen ions of 40 keV energy and dose of 1-1017 N cm2. From Fayeulle S. 71 . With permission from Elsevier Science. migration during the friction process while on the surface the hard

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