Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Juha-Pekka Hirvonen"'
Publikováno v:
Torri, P, Mahiout, A, Koskinen, J, Hirvonen, J-P & Johansson, L-S 2000, ' Corrosion properties of amorphous Mo-Si-N and nanolayered Mo-Si-Nn/SiC coatings ', Scripta Materialia, vol. 42, no. 6, pp. 609-613 . https://doi.org/10.1016/S1359-6462(99)00407-8
Corrosion properties of sputter deposited MoSi2, SiC, Mo-Si-N (MoSi2.2N2.5) and nanolayered Mo-Si-N/SiC coatings on Fe37 low carbon steel have been studied using electrochemical polarization measurements in 1 N H2SO4 solution. A decrease in both crit
Autor:
Harriet Kung, Michael Nastasi, Jari Likonen, Juha-Pekka Hirvonen, Reijo Lappalainen, J. R. Jervis, P. Torri
Publikováno v:
Hirvonen, J, Torri, P, Lappalainen, R, Likonen, J, Kung, H, Jarvis, J & Nastasi, M 1998, ' Oxidation of MoSi2/SiC nanolayered composite ', Journal of Materials Research, vol. 13, no. 4, pp. 965-973 . https://doi.org/10.1557/JMR.1998.0135
The oxidation behavior of a nanolayered MoSi2/SiC composite material was determined at the temperature range of 400–900 °C in wet oxidation conditions. The samples were produced in the form of thin films using a sputtering technique from two diffe
Publikováno v:
Hirvonen, J-P, Koskinen, J, Kaukonen, M, Nieminen, R & Scheibe, H-J 1997, ' Dynamic relaxation of the elastic properties of hard carbon films ', Journal of Applied Physics, vol. 81, no. 11, pp. 7248-7254 . https://doi.org/10.1063/1.365322
The effect of enhanced atomic mobility on the growth of hard carbon films was examined. Tetrahedrally bonded amorphous carbon films were deposited by condensing energetic carbon ions using an arc-discharge deposition method. The deposition temperatur
Publikováno v:
Surface and Coatings Technology. 84:600-604
Plasma and ion-assisted methods of surface modification have been studied for over three decades in the field of metals, semiconductors, ceramics, polymers, etc. A large number of different methods and approaches exist. A typical factor is the exploi
Publikováno v:
Koskinen, J, Hirvonen, J-P, Levoska, J & Torri, P 1996, ' Tribological characterization of carbon nitrogen coatings deposited by using vacuum arc discharge ', Diamond and Related Materials, vol. 5, no. 6-8, pp. 669-673 . https://doi.org/10.1016/0925-9635(95)00382-7
Carbon nitride (CN) films have been deposited by using the pulsed vacuum arc method on silicon and metallic substrates. Films were deposited in a nitrogen gas ambient varying between 0.01 and 0.56 Pa. The nitrogen content of the films as analysed by
Publikováno v:
Hirvonen, J-P, Koskinen, J, Jervis, J & Nastasi, M 1996, ' Present progress in the development of low friction coatings ', Surface and Coatings Technology, vol. 80, no. 1-2, pp. 139-150 . https://doi.org/10.1016/0257-8972(95)02701-7
Low friction coatings are being developed for a variety of reasons. Practical conditions in which machines and machine elements have to operate are ever expanding and more often involve features which preclude liquid or grease lubrication. An example
Publikováno v:
Nanostructured Materials. 7:81-88
A systematic study of the synthesis-structure-mechanical properties relationship is reported for MoSi 2 N x films. MoSi 2 N x films with nitrogen content x ranging between 0 and 4.2 were prepared by sputtering technique. Cross-sectional transmission
Publikováno v:
Surface and Coatings Technology. :760-764
AISI 420 stainless steel samples with a diameter of 25 mm were implanted with nitrogen, with chromium or with chromium and nitrogen. The implantation energy and nominal fluence for Cr were 230 keV and 2 × 10 17 ions cm −2 , and those for N were 50
Autor:
Terence E. Mitchell, Harriet Kung, T. R. Jervis, Michael Nastasi, Juha-Pekka Hirvonen, J.D. Embury
Publikováno v:
Kung, H, Jervis, T R, Hirvonen, J-P, Embury, J, Mitchell, T & Nastasi, M 1995, ' Structure and mechanical properties of MoSi2-SiC nanolayer composites ', Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties, vol. 71, no. 4, pp. 759-779 . https://doi.org/10.1080/01418619508236219
A systematic study of the structure-mechanical properties relationship is reported for both single phase and nanolayer composites of MoSi2 and SiC. Single phase or alternating layers of MoSi2 and SiC were synthesized by d.c.-magnetron and r.f.-diode
Autor:
P. Torri, Reijo Lappalainen, Joseph R. Tesmer, Michael Nastasi, Hannu Kattelus, Harriet Kung, Ilkka Suni, Juha-Pekka Hirvonen, T. R. Jervis
Publikováno v:
Hirvonen, J-P, Suni, I, Kattelus, H, Lappalainen, R, Torri, P, Kung, H, Nastasi, M, Jervis, T & Tesmer, J 1995, ' Crystallization and oxidation behaviour of Mo-Si-N coatings ', Surface and Coatings Technology, vol. 74-75, no. Part 2, pp. 981-985 . https://doi.org/10.1016/0257-8972(95)08327-8
Mo-Si-N coatings with different nitrogen concentrations were produced by nitrogen alloying simultaneously during sputter deposition from a planar magnetron MoSi2 target with nitrogen plasma onto steel substrates. The ratio of molybdenum and silicon c