Attended the The 3rd International Workshop of the PicoFIB Network at University of Sheffield. More info
0 Comments
Today, I got my Ph.D. degree at the University of Groningen, I would like to thank very much my parents, my supervisors (Prof. Yutao Pei and Prof. Jeff Th.M. De Hosson), my colleagues and friends. Without all your kind support and help, I could not make it here. This turn over a new leaf in my life.
This letter reports that a pre-notched WS2/a-C tribocoating surface can be fully healed through sliding. The healed notches act as superior lubricant micro-reservoirs affording frictionless responses leading to an ultralow coefficient of friction (0.02). HR-TEM observations reveal WS2 (002) platelets in the healed notch parallel to the outer coating surface and to the V-notch/coating interface. Direct evidence of the rearrangement of WS2 at the curved interface elucidates that basal plane reorientation does not occur necessarily parallel to the counterpart sliding direction as was taken for granted in literature. The patchy tribofilm provides a new avenue for self-healing efficiency in tribology whereby one may lift the requirement of producing defect-free coatings.
DOI: https://doi.org/10.1080/21663831.2018.1561538 This year the theme is additive manufacturing: 3D print first stainless steel bike, first steel or concrete bridge in the Netherlands, another interesting technology is the wire additive manufacture for printing large-scale parts in an economic and fast way.
Cool SLM 3DP printer in APE-RUG Group for directly printing metals. Thanks Dr. Amar Kamat for the basic training of operation.
DOI: doi.org/10.1016/j.msea.2018.08.086
Highlights:
The updated and most powerful FEI Helios G4 CX FIB has been installed in ZiAM-RUG, which is an extremely high-tech equipment specifically designed for TEM lamina preparation and it provides greatly enhanced efficiency . Moreover, the system is even equipped with the super powerful AutoTEM software, which assists to produce one lamella in less than 2 hours. Besides, the STEM-HAADF detector can help check the sample easily.
Thanks very much for Prof Dr. Bart Kooi and Dr. Jamo Momand arranged the inspiring training. It is a very very powerful tool. Highlights:
By FIB-HRTEM, we have found that the sliding contact could immediately reorient the WS2 platelets parallel to the sliding interface, in contrary to that amorphous TMDs crystallize initially from the bottom of the wear track and become mostly ordered at the outmost tribofilm as extensively reported before, and thereby it leads to a self-adaptive “frictionless” response. The coefficient of friction falls to 0.02 in dry air and reaches 0.10 in humid air, and is reversible as testing atmosphere cycles between dry air and humid air. Ref: https://doi.org/10.1016/j.matlet.2018.06.111 J.Q. Liu, L.J. Li, B. Wei, F. Wen, H.T. Cao, Y.T. Pei. Effect of sputtering pressure on the surface topography, structure, wettability and tribological performance of DLC films coated on rubber by magnetron sputtering. Surface and Coatings Technology, 2018. (https://doi.org/10.1016/j.surfcoat.2018.05.012)
Highlights:
DOI: https://doi.org/10.1016/j.surfcoat.2018.04.040 A coauthored paper"Copper-mediated Homogeneous Living Radical Polymerization of Acrylamide with Waxy Potato Starch-based Macroinitiator" was accepted to publish in Journal of Carbohydrate Polymers. Congratulations to YiFei Fan.
DOI: https://doi.org/10.1016/j.carbpol.2018.03.041 Attended Groningen Engineering Center Scientific Meeting and presented a poster titled “Self-adaptive triboperformance of magnetron sputtered WS2/a-C nanocomposite coatings”Thanks Ali Chabok, I got more EBSD skils and FIB-assisted Digital Image Correlation (DIC) for residual stress on superalloys, hope we could co-publish papers together!Organised every two years, the PBII&D conference is the occasion to present latest scientific developments and detect future trends concerning plasma based ion assisted surface treatments and thin films deposition. This conference is designed to bring attendances a fruitful gathering, allowing the contact with key researchers from all regions of the world, opening up opportunities for new collaborations at global level.
link1, link2
Conference Paper|Hard yet tough high vanadium high speed steel composite coating in-situ alloyed by atmospheric plasma arc, was presented by Prof. Yutao Pei (invited talk) at the 8th International Conference on Computational Methods and Experiments in Material and Contact Characterization, 21-23 June, 2017, Tallinn, Estonia. Link
Published in Int. J. Comp. Meth. and Exp. Meas., Vol. 6, No. 3 (2018) 540–550 Highlights:
“Microstructure evolution of graded high-vanadium tool steel composite coating in-situ fabricated via atmospheric plasma beam alloying” was accepted to the Journal of Alloys and Compounds today. LinkHighlights:
1. A graded metal matrix composite coating was in situ produced on ductile iron by plasma surface alloying process; 2. Spherical, hard submicro metal carbides that replace soft graphite nodules render coating hard yet-tough; 3. Microscopic characterizations verify the abundant ultrafine particles primarily to be vanadium carbides Great conference, I have learned a lot from both scientists and technologists from academia and industry, And also it was a great pleasure to meet a lot of cool professors in the meeting and thanks very much for all your kind suggestions and help. Link
Get the training of XPS with the help of Sumit Kumar and and Jos Noteboom in prof. dr. P. (Petra) Rudolf' group
PANALYTICAL: XPert Pro MRD is able to yield much better GIXRD results that that from D8 Advance. Thanks Mart Salverda for the training
Poster presentation was presented on the Fifteenth International Conference on Reactive Sputter Deposition on 1 & 2 December, Ghent, Belgium (Gent University).
|
CategoriesH.T. CaoGod helps those who help themselves. Archives
January 2020
|