Seminar

14^th TWC International Wear Seminar
New insights into materials science
12^th December 2023 at 13:00-16:00 (UTC+2, Finnish time)
Free online webinar

The webinar introduces the three new materials science research groups at Tampere University. The program is divided to three sessions that are presenting the latest research topics of Tribology and Surface Modification, Coating Technologies, and Renewable Energy Technologies.

Tribology and Surface Modification is a multi-disciplinary research group performing research in different aspects of tribology and fatigue. The primary professional research of the group is related to the application of surface modification technologies to the study of solid basis in tribology, mechanics of materials, contact mechanics, degradation mechanisms, and mechanical characterizations of various materials, including metals, coatings, and ceramics.

Coating Technologies concentrates on the development of coatings for harsh conditions such as icing, corrosion, and wear as well as additive manufacturing by using cold spraying. It is developing future coatings by starting from material optimization through coating processing to final performance towards more sustainable future.

Renewable Energy Technologies develops renewable energy technologies with improved performance, durability, and cost-effectiveness, thereby driving the transition towards sustainable energy sources. Leveraging their expertise in electrochemistry and materials science, the research group primarily focuses on advancing green hydrogen production and its derivatives, energy storage solutions, and cutting-edge energy conversion technologies.

The webinar is free of charge and arranged on-line (Zoom). The participation link and the recording of the webinar will be sent for the registered participants.

Registration link

Program

Tribology and Surface Modification

13:00 Wear mechanisms of thermally sprayed ceramic coatings in fuel lubrication conditions, Associate Professor (tenure track) Auezhan Amanov, Tampere University

13:30 Effects of loading parameters on the torsional fretting induced damage in large area annular flat-on-flat contacts of quenched and tempered steel, Doctoral Researcher Repekka Kovanen, Tampere University

13:55 Break

Coating technologies

14:00 Latest research activities in Coating technologies focusing on thermal spraying, Associate Professor (tenure track) Heli Koivuluoto, Tampere University

14:30 A cold spray horizon: Innovative multifunctional composite coatings for superior performance, Doctoral Researcher Reza Jafari, Tampere University

14:55 Break

Renewable Energy Technologies

15:05 Additive manufacturing of solid oxide electrolyzers and fuel cells for accelerating the green hydrogen economy, Associate Professor (tenure track) Imran Asghar, Tampere University

15:35 Solid oxide cell fabrication and characterization techniques, Doctoral Researcher Buse Bilbey, Tampere University

16:00 Ending of the webinar

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Registration link

Contacts

Kati Valtonen

Staff Scientist
Faculty of Engineering and Natural Sciences
Tampere University
+358408490142
kati.valtonen@tuni.fi

https://orcid.org/0000-0002-0613-5497

More information

About me

I am responsible of the research services and the infrastructure of Tampere Wear Center and the materials characterization facilities. My particular research interests are the high stress abrasive and impact wear of steels, characterization of wear mechanisms, and assessment of the relevance of laboratory wear test methods in regard of the in-service performance of steels and other wear resistant materials.

Research fields

Materials science, wear of materials, materials characterization

Main positions of trust

Selected publications

I have over 70 peer-reviewed scientific articles and about 70 other scientific publications, including conference papers with h-index 21 (Scopus).

Key publications:

Valtonen, K., Ojala, N., Haiko, O., Kuokkala, V.-T. Comparison of various high-stress wear conditions and wear performance of martensitic steels, Wear 426–427:3-13(2019).

Chintha, A.R., Valtonen, K. Kuokkala, V.-T., Kundu, S. Peet, M., Bhadeshia, H.K.D.H. Role of fracture toughness in impact-abrasion wear, Wear 428–429:430-437(2019).

Valtonen, K., Ratia, V., Ramakrihnan, K.R., Apostol, M., Terva, J., Kuokkala, V.-T., Impact wear and mechanical behavior of steels in subzero conditions. Tribology International 129:476-493(2019).

Valtonen, K., Keltamäki, K., Kuokkala, V.-T., High-stress abrasion of wear resistant steels in the cutting edges of loader buckets, Tribology International 119: 707–720(2018).

Valtonen, K., Ratia, V., Ojala, N., Kuokkala, V.-T., Comparison of laboratory wear test results with the in-service performance of cutting edges of loader buckets, Wear 388-389:93-100(2017).

Ojala, N., Valtonen, K., Minkkinen, J. & Kuokkala, V.-T. Edge effect in high speed slurry erosion wear tests of steels and elastomers, Wear 388-389:126-135(2017).

Ojala N., Valtonen K., Antikainen, A., Kemppainen, A., Minkkinen, J., Oja, O., Kuokkala V.-T. Wear performance of quenched wear resistant steels in abrasive slurry erosion, Wear 354-355:21-31(2016).

Oksanen, V., Valtonen, K., Andersson, P., Vaajoki, A., Laukkanen, A., Holmberg, K. & Kuokkala, V. T. 2015. Comparison of laboratory rolling-sliding wear tests with in-service wear of nodular cast iron rollers against wire ropes, Wear 340-341:73-81(2015).

Lindroos, M., Valtonen, K., Laukkanen, A., Holmberg, K., Kuokkala, V-T., Kemppainen, A., Wear behavior and work hardening of high strength steels in high stress abrasion, Wear 322-323:32-40(2015).

Ojala, N., Valtonen K., Heino V., Kallio M., Aaltonen J., Siitonen P. & Kuokkala, V.-T., Effects of composition and microstructure on abrasive wear performance of quenched wear resistant steels, Wear 317(1–2): 225–232(2014).

Ojala, N., Valtonen, K., Kivikytö-Reponen, P., Vuorinen, P., Siitonen, P. & Kuokkala, V.-T., The effect of test parameters on large particle high-speed slurry erosion testing, Tribology - Materials, Surfaces & Interfaces 8(2):98-104(2014).

Ratia, V., Valtonen, K., Kemppainen, A., Vippola, M., Kuokkala, V.-T., High-Stress Abrasion and Impact-Abrasion Testing of Wear Resistant Steels, Tribology Online 8(2):152-161(2013).

Own links

Latest publications

Enhancing the cavitation erosion resistance of AISI 420-type stainless steel with quenching and partitioning

Raami, L., Varis, T., Valtonen, K., Wendler, M., Volkova, O. & Peura, P., huhtik. 2023, julkaisussa: Wear. 526-527, 8 Sivumäärä, 204897.

Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu

High-stress abrasive wear performance of medium-carbon direct-quenched and partitioned, carbide-free bainitic, and martensitic steels

Haiko, O., Pallaspuro, S., Javaheri, V., Kaikkonen, P., Ghosh, S., Valtonen, K., Kaijalainen, A. & Kömi, J., 15 elok. 2023, julkaisussa: Wear. 526-527, 204925.

Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu

Effect of pretreatment and biomass blending on bio-oil and biochar quality from two-step slow pyrolysis of rice straw

Bhatnagar, A., Singhal, A., Tolvanen, H., Valtonen, K., Joronen, T. & Konttinen, J., 1 helmik. 2022, julkaisussa: Waste Management. 138, s. 298-307 10 Sivumäärä

Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu

Experimental studies of high stress abrasive and impact-abrasive wear

Valtonen, K., 14 kesäk. 2022.

Tutkimustuotos: Abstrakti › Scientific

Formation of nanostructured surface layer, the white layer, through solid particles impingement during slurry erosion in a martensitic medium-carbon steel

Javaheri, V., Sadeghpour, S., Karjalainen, P., Lindroos, M., Haiko, O., Sarmadi, N., Pallaspuro, S., Valtonen, K., Pahlevani, F., Laukkanen, A. & Kömi, J., 15 toukok. 2022, julkaisussa: Wear. 496-497, 204301.

Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu

High-stress abrasive wear characteristics of ultra-high strength press-hardening steel

Haiko, O., Valtonen, K., Kaijalainen, A., Javaheri, V. & Kömi, J., 2022, julkaisussa: Tribologia. 39, 3-4, s. 32-41 10 Sivumäärä

Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu

Influence of process parameters on the particle–matrix interaction of WC-Co metal matrix composites produced by laser-directed energy deposition

Ostolaza, M., Arrizubieta, J. I., Queguineur, A., Valtonen, K., Lamikiz, A. & Flores Ituarte, I., marrask. 2022, julkaisussa: Materials and Design. 223, 111172.

Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu

Mikroskopiakonferenssi Scandem 2022

Honkanen, M., Salminen, T., Valtonen, K. & Vippola, M., 2022, julkaisussa: Materia. 4, s. 59-60 2 Sivumäärä

Tutkimustuotos: Artikkeli › Professional

Scandem 2022: Book of Abstracts

Honkanen, M., Rantala, J., Salminen, T., Valtonen, K. & Vippola, M., 2022, Tampere: Tampere University.

Tutkimustuotos: Kokoomateos › Professional

Impacts of Phosphorous Source on Organic Acid Production and Heterotrophic Bioleaching of Rare Earth Elements and Base Metals from Spent Nickel-Metal-Hydride Batteries

Rasoulnia, P., Barthen, R., Valtonen, K. & Lakaniemi, A-M., 2021, julkaisussa: Waste and Biomass Valorization. 12, 10, s. 5545–5559 15 Sivumäärä

Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu