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Jens Darsell

Jens Darsell

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352
(509) 375-6342

Biography

Dr. Jens Darsell received a Ph.D. in Materials Science from Washington State University in 2007. His dissertation focused on developing a family of Air Braze alloys based on Ag-CuO-Pd with potential applications in electrochemical devices such as solid oxide fuel cell (SOFC). His primary focus since joining PNNL as a staff member in 2008 has been on joining problems including metal and ceramic joints using air braze alloys or glass sealants for SOFCs. In addition he has specified and used other soldering and brazing methods for joining aluminum and stainless steel, aluminum to magnesium, titanium alloys, as well as nickel alloy and stainless steel heat exchangers. In 2009 he began to expand into Friction Stir Welding and Processing (FSW/FSP) of advanced high temperature materials used in power plants as well as some temperature alloys. Late in 2011 he was involved in the early work to use friction to consolidate and extrude materials in what has now become known as Shear Assisted Processing and Extrusion (ShAPE). In addition to joining and processing of materials he has significant experience in material characterization techniques ranging from SEM, XRD, and several thermal analysis techniques.

Research Interests

  • Techniques for Solid Phase Processing (SPP) of materials such as FSW, FSP, and ShAPE.
  • Material processing and structure relationships.
  • Additives to promote fine grained materials such as Oxide Dispersion Strengthened (ODS) steels.
  • Joining of metals and ceramics using air brazing or other forms of brazing and soldering.

Education and Credentials

  • PhD in Materials Science, Washington State University, Pullman WA, May (2007)
  • MS in Mechanical Engineering, Washington State University, Pullman WA, (2000)
  • BS in Mechanical Engineering, Washington State University, Pullman WA, (1998)

Affiliations and Professional Service

  • The Minerals, Metals and Materials Society (TMS)
  • American Welding Society (AWS)

PNNL Patents

PNNL Publications

2018

  • Darsell J.T., N.R. Overman, V.V. Joshi, S. Mathaudhu, and S.A. Whalen. 2018. "Shear Assisted Processing and Extrusion (ShAPE) of AZ91E Flake: A Study of Tooling Features and Processing Effects." Journal of Materials Engineering and Performance 27, no. 8:4150-4161. PNNL-SA-129883. doi:10.1007/s11665-018-3509-1

2017

  • Estevez L., V. Prabhakaran, A.L. Garcia, Y. Shin, J. Tao, A.M. Schwarz, and J.T. Darsell, et al. 2017. "Hierarchically Porous Graphitic Carbon with Simultaneously High Surface Area and Colossal Pore Volume Engineered via Ice Templating." ACS Nano 11, no. 11:11047-11066. PNNL-SA-126443. doi:10.1021/acsnano.7b05085
  • Jiang X., S.A. Whalen, J.T. Darsell, S. Mathaudhu, and N.R. Overman. 2017. "Friction Consolidation of Gas-Atomized Fe-Si Powders for Soft Magnetic Applications." Materials Characterization 123. PNNL-SA-120598. doi:10.1016/j.matchar.2016.11.026
  • Overman N.R., S.A. Whalen, M.E. Bowden, M.J. Olszta, K. Kruska, T. Clark, and E.L. Stevens, et al. 2017. "Homogenization and Texture Development in Rapidly Solidified AZ91E Consolidated by Shear Assisted Processing and Extrusion (ShAPE)." Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing 701. PNNL-SA-122981. doi:10.1016/j.msea.2017.06.062
  • Ross K.A., G.J. Grant, J.T. Darsell, and D. Catalini. 2017. "Simultaneous Independent Control of Tool Axial Force and Temperature in Friction Stir Processing." In Friction Stir Welding and Processing IX, edited by Y Hovanski, et al, 269-275. Cham:Springer International Publishing. PNNL-SA-121974. doi:10.1007/978-3-319-52383-5_26

2016

  • Bhattacharya P., M.I. Nandasiri, D. Lv, A.M. Schwarz, J.T. Darsell, W.A. Henderson, and D.A. Tomalia, et al. 2016. "Polyamidoamine Dendrimer-Based Binders for High-Loading Lithium-Sulfur Battery Cathodes." Nano Energy 19. PNNL-SA-112056. doi:10.1016/j.nanoen.2015.11.012

2014

  • Cui J., J. Choi, G. Li, E. Polikarpov, J.T. Darsell, M.J. Kramer, and N. Zarkevich, et al. 2014. "Development of MnBi permanent magnet: neutron diffraction of MnBi powder." Journal of Applied Physics 115, no. 17:Article No. 17A743. PNNL-SA-98434. doi:10.1063/1.4867230
  • Cui J., J. Choi, G. Li, E. Polikarpov, J.T. Darsell, N.R. Overman, and M.J. Olszta, et al. 2014. "Thermal Stability of MnBi Magnetic Materials." Journal of Physics: Condensed Matter 26, no. 6:Article No. 064212. PNNL-SA-97263. doi:10.1088/0953-8984/26/6/064212

2013

  • Joshi V., A.M. Meier, J.T. Darsell, P. Nachimuthu, M. Bowden, and K.S. Weil. 2013. "Short-Term Oxidation Studies on Nicrofer-6025HT in Air at Elevated Temperatures for Advanced Coal Based Power Plants." Oxidation of Metals 79, no. 3:383-404. PNNL-SA-75314. doi:10.1007/s11085-013-9362-6
  • Joshi V.V., A. Meier, J.T. Darsell, K.S. Weil, and M.E. Bowden. 2013. "Trends in wetting behavior for Ag-CuO braze alloys on Ba0.5Sr0.5Co0.8Fe0.2O(3-d) at elevated temperatures in air." Journal of Materials Science 48, no. 20:7153-7161. PNNL-SA-94525. doi:10.1007/s10853-013-7531-2
  • Joshi V.V., A. Meier, J.T. Darsell, P. Nachimuthu, M.E. Bowden, and K.S. Weil. 2013. "Short-Term Oxidation Studies on Nicrofer- 6025HT in Air at Elevated Temperatures for Advanced Coal Based Power Plants." Oxidation of Metals 79, no. 3-4:383-404. PNNL-SA-94018. doi:10.1007/s11085-013-9362-6
  • Joshi V.V., J. Choi, J.T. Darsell, A. Meier, and K.S. Weil. 2013. "Reactive Air Aluminizing of Nicrofer-6025HT for Use in Advanced Coal-Based Power Plants." Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science 44, no. 1 (Supplement):188-192. PNNL-SA-87186. doi:10.1007/s11661-012-1237-y

2012

  • Friant J.R., A.M. Meier, J.T. Darsell, and K.S. Weil. 2012. "Transitions in Wetting Behavior Between Liquid Ag-CuO Alloys and Al2O3 Substrates." Journal of the American Ceramic Society 95, no. 5:1549-1555. PNNL-SA-69012. doi:10.1111/j.1551-2916.2012.05094.x

2011

  • Cosimbescu L., E. Polikarpov, J.S. Swensen, J.T. Darsell, and A.B. Padmaperuma. 2011. "Hole-Rich Host Materials for Blue Phosphorescent OLEDs." Journal of the Society for Information Display 19, no. 4:353-359. PNNL-SA-74898. doi:10.1889/JSID19.4.353
  • Weil K.S., J.T. Darsell, and J.Y. Kim. 2011. "Air Brazing: A New Method of Ceramic-Ceramic and Ceramic-Metal Joining." In Ceramic Integration and Joining Technologies: From Micro to Nanoscale, edited by M Singh, et al. 91-141. Hoboken, New Jersey:John Wiley & Sons. PNNL-SA-62415.

2010

  • Darsell J.T., and K.S. Weil. 2010. "High Temperature Strength of YSZ Joints Brazed with Palladium Silver Copper Oxide Filler Metals." International Journal of Hydrogen Energy 36, no. 7:4519-4524. PNNL-SA-79857. doi:10.1016/j.ijhydene.2010.05.018
  • Koech P.K., A.B. Padmaperuma, L. Wang, J.S. Swensen, E. Polikarpov, J.T. Darsell, and J.E. Rainbolt, et al. 2010. "Synthesis and application of 1,3,4,5,7,8-Hexafluorotetracyanonaphtoquinodimethane (F6-TNAP): A Conductivity Dopant for Organic Light-Emitting Devices." Chemistry of Materials 22, no. 13:3926-3932. PNNL-SA-68774.
  • Von Ruden A.L., L. Cosimbescu, E. Polikarpov, P.K. Koech, J.S. Swensen, L. Wang, and J.T. Darsell, et al. 2010. "Phosphine Oxide Based Electron Transporting and Hole Blocking Materials for Blue Electrophosphorescent Organic Light Emitting Devices." Chemistry of Materials 22, no. 20:5678-5686. PNNL-SA-72786. doi:10.1021/cm1013653

2009

  • Lin T.Z., C. Tan, B. Liu, J.T. Darsell, and K.S. Weil. 2009. "A High-temperature Sealing Technology for Solid Oxide Fuel Cells." In TMS 2009: 138th Annual Meeting & Exhibition Supplemental Proceedings, 2, 169-174. Warrendale, Pennsylvania:The Minerals, Metals & Materials Society. PNNL-SA-66181.
  • Weil K.S., and J.T. Darsell. 2009. "JOINING OF ADVANCED HIGH-TEMPERATURE MATERIALS." In Proceedings of the 23rd Annual Conference on Fossil Energy Materials, May 12-14, 2009, Pittsburgh, Pennsylvania. Pittsburgh, Pennsylvania:National Energy Technology Laboratory. PNNL-SA-67223.

2008

  • Darsell J.T., and K.S. Weil. 2008. "Effect of filler metal composition on the strength of yttria stabilized zirconia joints brazed with Pd-Ag-CuOx." Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science 39, no. 9:2095-2105. PNNL-SA-56438. doi:10.1007/s11661-008-9565-7

2007

  • Darsell J.T., and K.S. Weil. 2007. "Experimental Determination of Phase Equilibria in the Silver-Copper Oxide System at High Temperature." Scripta Materialia 56, no. 12:1111-1114. PNNL-SA-51568.
  • Darsell J.T., and K.S. Weil. 2007. "The effect of palladium additions on the solidus/liquidus temperatures and wetting properties of Ag-CuO based air brazes." Journal of Alloys and Compounds 433, no. 1-2:184-192. PNNL-SA-42915. doi:10.1016/j.jallcom.2006.06.073
  • Darsell J.T., and K.S. Weil. 2007. "The Effect of Palladium Additions on the Solidus/Liquidus Temperatures and Wetting Properties of Ag-CuO Based Air Brazes." Journal of Alloys and Compounds 433, no. 1-2:184-192. PNNL-SA-46328. doi:10.1016/j.jallcom.2006.06.073
  • Weil K.S., J.T. Darsell, and J.Y. Kim. 2007. "Advances in Air Brazing: Brazing Sealing Technology for Gas Separation Membranes." In Proceedings of the 20th Annual Conference on Fossil Energy Materials, June 12-14, 2006, Knoxville, TN, edited by RR Judkins and LS Mack, ORNL/4741, 244-253. Oak Ridge, Tennessee:DOE Office of Scientific and Technical Information. PNNL-SA-51394.

2006

  • Darsell J.T., and K.S. Weil. 2006. "Effect of Pd Additions on the Invariant Reactions in the Ag-CuOx System." Journal of Phase Equilibria and Diffusion 27, no. 1:92-101. PNNL-SA-45288.
  • Darsell J.T., and K.S. Weil. 2006. "Phase Evolution in the Pd-Ag-CuO Air Braze Filler Metal Alloy System." In Materials Science & Technology Conference and Exhibition, (MS&T 2006), October 15-19, 2006, Cincinnati, Ohio, 6, 11-18. Westerville, Ohio:American Ceramic Society. PNNL-SA-50588.
  • Darsell J.T., J.S. Hardy, J.Y. Kim, and K.S. Weil. 2006. "Investigation of Pd-Modified Ag-CuO Air Braze Filler Metals." In Brazing and Soldering: Proceedings of the 3rd International Brazing and Soldering Conference, April 23-26, 2006, San Antonio, Texas, edited by JJ Stephens and KS Weil, 167-175. Materials Park, Ohio:ASM International. PNNL-SA-47942.
  • Weil K.S., and J.T. Darsell. 2006. "DEVELOPMENT OF A HIGH-TEMPERATURE CERAMIC BRAZE: ANALYSIS OF PHASE EQUILIBRIA IN THE Pd-Ag-CuOx SYSTEM." In Mechanical Properties and Performance of Engineering Ceramics II: 30th International Conference on Advanced Ceramics and Composites, January 22-27, 2006, Cocoa Beach, Florida. Ceramic Engineering and Science Proceedings, edited by R. Tandon, A. Wereszczak and E. Lara-Curzio, 27, 483-490. Hoboken, New Jersey:John Wiley & Sons, Inc. PNNL-SA-48107. doi:10.1002/9780470291313.ch46
  • Weil K.S., J.Y. Kim, J.S. Hardy, and J.T. Darsell. 2006. "Improved Wetting Characteristics in TiO2-Modified Ag-CuO Air Braze Filler Metals." In Brazing and Soldering 2006: Proceedings of the 3rd International Brazing and Soldering Conference, April 23-26, 2006, San Antonio, Texas, edited by JJStephens and KS Weil, 120-124. Materials Park, Ohio:ASM International. PNNL-SA-47943.
  • Weil K.S., J.Y. Kim, J.S. Hardy, and J.T. Darsell. 2006. "Improved Wetting Characteristics in TiO2-Modified Ag-CuO Air Braze Filler Metals." In Proceedings of the 3rd International Conference on Brazing and Soldering, edited by JJ Stephens and KS Weil, 120-124. Materials Park, Ohio:ASM International. PNNL-SA-47911.
  • Weil K.S., J.Y. Kim, J.S. Hardy, and J.T. Darsell. 2006. "Investigation of Pd-Modified Ag-CuO Air Braze Filler Metals." In Proceedings of the 3rd Internation Conference on Brazing and Soldering, edited by JJ Stephens and KS Weil, 167-175. Materials Park, Ohio:ASM International. PNNL-SA-47912.
  • Weil K.S., J.Y. Kim, J.S. Hardy, and J.T. Darsell. 2006. "The Effect of TiO2 on the Wetting Behavior of Silver-copper Oxide Braze Filler Metals." Scripta Materialia 54, no. 6:1071-1075. PNNL-SA-46329.

2005

  • Darsell J.T., J.S. Hardy, J.Y. Kim, and K.S. Weil. 2005. "Microstructure, Melting and Wetting Properties of Pd-Ag-CuO Air Braze on Alumina." In Surfaces, Interfaces, and the Science of Ceramic Joining: Proceedings of the 106th Annual Meeting of the American Ceramic Society. Ceramic Transactions, edited by KS Weil, IE Reimanis and CA Lewisohn, 158, 173-182. Westerville, Ohio:American Ceramic Society. PNNL-SA-41074.
  • Hardy J.S., K.S. Weil, J.Y. Kim, and J.T. Darsell. 2005. "Pd-modified Reactive Air Braze for Increased Melting Temperature." In Surfaces, Interfaces, and the Science of Ceramic Joining (Ceramic Transactions Vol. 158), 147-154. Westerville:American Ceramic Society. PNNL-SA-41212.
  • Hardy J.S., K.S. Weil, J.Y. Kim, E.C. Thomsen, and J.T. Darsell. 2005. "TiO2-modified Ag-CuO Reactive Air Brazes for Improved Wettability on Mixed Ionic/Electronic Conductors." In Surfaces, Interfaces, and the Science of Ceramic Joining Published in CERAMIC TRANSACTIONS, 158, 165-171. Westerville:American Ceramic Society. PNNL-SA-41237.
  • Weil K.S., and J.T. Darsell. 2005. "An Interfacial Characterization of Pd-Ag-CuO Reactive Air Joints with Alumina." In 107th American Ceramic Society Annual Meeting and Exposition. Westerville, Ohio:American Ceramic Society. PNNL-SA-45058.
  • Weil K.S., C.A. Coyle, J.T. Darsell, G. Xia, and J.S. Hardy. 2005. "Effects of Thermal Cycling and Thermal Aging on the Hermeticity and Strength of Silver-Copper Oxide Air-Brazed Seals." Journal of Power Sources 152. PNNL-SA-45923.

2004

  • Darsell J.T., J.S. Hardy, J.Y. Kim, and K.S. Weil. 2004. "AN INVESTIGATION OF WETTABILITY, AND MICROSTRUCTURE IN ALUMINA JOINTS BRAZED WITH Ag-CuO-TiO2." In Ceramic Transactions: Surfaces, Interfaces, and the Science of Ceramic Joining: Proceedings of the 106th Annual Meeting of the American Ceramic Society, edited by KS Weil, IE Reimanis and CA Lewinsohn, 158, 65-72. Westerville, Ohio:American Ceramic Society. PNNL-SA-41236.
  • Darsell J.T., J.S. Hardy, J.Y. Kim, and K.S. Weil. 2004. "Microstructure, Melting and Wetting Properties of Pd-Ag-CuO Air Braze on Alumina." In Surfaces, Interfaces and Science of Ceramic Joining: Proceedings of the 106th Annual Meeting of The American Ceramic Society, Indianapolis, Indiana, USA 2004, Ceramic Transactions, edited by KS Weil, IE Reimanis and CA Lewinshohn, 158, 173-182. Westerville, Ohio:American Ceramic Society. PNNL-SA-41213.
  • Hardy J.S., J.T. Darsell, C.A. Coyle, J.C. Birnbaum, and K.S. Weil. 2004. "Thermal Cyclability of Reactive Air Braze Seals in Anode Supported Solid Oxide Fuel Cells." In Joining of Advanced and Specialty Materials VI - Proceedings from Materials Solutions 2003 on Joining of Advanced and Specialty Materials, Oct. 13-15 2003, Pittsburgh, PA, United States, 51-58. Materials Park, Ohio:ASM International. PNNL-SA-39770.
  • Weil K.S., J.S. Hardy, and J.T. Darsell. 2004. "INVESTIGATION OF A NOVEL AIR BRAZING COMPOSITION FOR HIGH-TEMPERATURE, OXIDATION-RESISTANT CERAMIC JOINING." In 28th International Conference on Advanced Ceramics and Composites A: Ceramic Engineering and Science Proceedings, edited by E Lara-Curzio and MJ Readey, 25, 107-112. Westerville, Ohio:American Ceramic Society. PNNL-SA-42747. doi:10.1002/9780470291184.ch14
  • Weil K.S., J.T. Darsell, J.S. Hardy, and J.Y. Kim. 2004. "Advances in Air Brazing for Use in Joining and Sealing High-Temperature Gas Separation Membranes." In Proceedings of the 18th Annual Conference on Fossil Energy Materials, June 2-4, 2004, Knoxville, Tennessee, edited by RR Judkins and LS Mack, ORNL/R04-1203.5. Oak Ridge, Tennessee:Oak Ridge National Laboratory. PNNL-SA-42743.

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