The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

Amiya K. Mukherjee - One of the best experts on this subject based on the ideXlab platform.

  • spark plasma sintering a high strain rate low temperature Forming Tool for ceramics
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: Dongtao Jiang, Dustin M. Hulbert, Joshua David Kuntz, Umberto Anselmitamburini, Amiya K. Mukherjee
    Abstract:

    Abstract Spark plasma sintering (SPS) technique is being widely used to produce nanocrystalline materials by virtue of rapid sintering at relatively lower temperatures. In this investigation, fully dense Al 2 O 3 –ZrO 2 –MgAl 2 O 4 composite was superplastically formed into a complex shape using SPS equipment with a strain rate of approximately 10 −2  s −1 at temperatures as low as 1150 °C which is impossible to obtain by using conventional Forming methods. Furthermore, a powder compact can be directly shaped into a complex shape, combining sintering and Forming into one step. The product is fully dense and free of surface cracks. These results indicate that SPS can be a very competitive Forming Tool for ceramics as well other hard materials.

  • Spark plasma sintering: A high strain rate low temperature Forming Tool for ceramics
    Materials Science and Engineering A, 2007
    Co-Authors: Dongtao Jiang, Dustin M. Hulbert, Joshua David Kuntz, Umberto Anselmi-tamburini, Amiya K. Mukherjee
    Abstract:

    Spark plasma sintering (SPS) technique is being widely used to produce nanocrystalline materials by virtue of rapid sintering at relatively lower temperatures. In this investigation, fully dense Al2O3-ZrO2-MgAl2O4composite was superplastically formed into a complex shape using SPS equipment with a strain rate of approximately 10-2s-1at temperatures as low as 1150 °C which is impossible to obtain by using conventional Forming methods. Furthermore, a powder compact can be directly shaped into a complex shape, combining sintering and Forming into one step. The product is fully dense and free of surface cracks. These results indicate that SPS can be a very competitive Forming Tool for ceramics as well other hard materials. © 2006 Elsevier B.V. All rights reserved.

Dongtao Jiang - One of the best experts on this subject based on the ideXlab platform.

  • spark plasma sintering a high strain rate low temperature Forming Tool for ceramics
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: Dongtao Jiang, Dustin M. Hulbert, Joshua David Kuntz, Umberto Anselmitamburini, Amiya K. Mukherjee
    Abstract:

    Abstract Spark plasma sintering (SPS) technique is being widely used to produce nanocrystalline materials by virtue of rapid sintering at relatively lower temperatures. In this investigation, fully dense Al 2 O 3 –ZrO 2 –MgAl 2 O 4 composite was superplastically formed into a complex shape using SPS equipment with a strain rate of approximately 10 −2  s −1 at temperatures as low as 1150 °C which is impossible to obtain by using conventional Forming methods. Furthermore, a powder compact can be directly shaped into a complex shape, combining sintering and Forming into one step. The product is fully dense and free of surface cracks. These results indicate that SPS can be a very competitive Forming Tool for ceramics as well other hard materials.

  • Spark plasma sintering: A high strain rate low temperature Forming Tool for ceramics
    Materials Science and Engineering A, 2007
    Co-Authors: Dongtao Jiang, Dustin M. Hulbert, Joshua David Kuntz, Umberto Anselmi-tamburini, Amiya K. Mukherjee
    Abstract:

    Spark plasma sintering (SPS) technique is being widely used to produce nanocrystalline materials by virtue of rapid sintering at relatively lower temperatures. In this investigation, fully dense Al2O3-ZrO2-MgAl2O4composite was superplastically formed into a complex shape using SPS equipment with a strain rate of approximately 10-2s-1at temperatures as low as 1150 °C which is impossible to obtain by using conventional Forming methods. Furthermore, a powder compact can be directly shaped into a complex shape, combining sintering and Forming into one step. The product is fully dense and free of surface cracks. These results indicate that SPS can be a very competitive Forming Tool for ceramics as well other hard materials. © 2006 Elsevier B.V. All rights reserved.

Joshua David Kuntz - One of the best experts on this subject based on the ideXlab platform.

  • spark plasma sintering a high strain rate low temperature Forming Tool for ceramics
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: Dongtao Jiang, Dustin M. Hulbert, Joshua David Kuntz, Umberto Anselmitamburini, Amiya K. Mukherjee
    Abstract:

    Abstract Spark plasma sintering (SPS) technique is being widely used to produce nanocrystalline materials by virtue of rapid sintering at relatively lower temperatures. In this investigation, fully dense Al 2 O 3 –ZrO 2 –MgAl 2 O 4 composite was superplastically formed into a complex shape using SPS equipment with a strain rate of approximately 10 −2  s −1 at temperatures as low as 1150 °C which is impossible to obtain by using conventional Forming methods. Furthermore, a powder compact can be directly shaped into a complex shape, combining sintering and Forming into one step. The product is fully dense and free of surface cracks. These results indicate that SPS can be a very competitive Forming Tool for ceramics as well other hard materials.

  • Spark plasma sintering: A high strain rate low temperature Forming Tool for ceramics
    Materials Science and Engineering A, 2007
    Co-Authors: Dongtao Jiang, Dustin M. Hulbert, Joshua David Kuntz, Umberto Anselmi-tamburini, Amiya K. Mukherjee
    Abstract:

    Spark plasma sintering (SPS) technique is being widely used to produce nanocrystalline materials by virtue of rapid sintering at relatively lower temperatures. In this investigation, fully dense Al2O3-ZrO2-MgAl2O4composite was superplastically formed into a complex shape using SPS equipment with a strain rate of approximately 10-2s-1at temperatures as low as 1150 °C which is impossible to obtain by using conventional Forming methods. Furthermore, a powder compact can be directly shaped into a complex shape, combining sintering and Forming into one step. The product is fully dense and free of surface cracks. These results indicate that SPS can be a very competitive Forming Tool for ceramics as well other hard materials. © 2006 Elsevier B.V. All rights reserved.

Dustin M. Hulbert - One of the best experts on this subject based on the ideXlab platform.

  • spark plasma sintering a high strain rate low temperature Forming Tool for ceramics
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: Dongtao Jiang, Dustin M. Hulbert, Joshua David Kuntz, Umberto Anselmitamburini, Amiya K. Mukherjee
    Abstract:

    Abstract Spark plasma sintering (SPS) technique is being widely used to produce nanocrystalline materials by virtue of rapid sintering at relatively lower temperatures. In this investigation, fully dense Al 2 O 3 –ZrO 2 –MgAl 2 O 4 composite was superplastically formed into a complex shape using SPS equipment with a strain rate of approximately 10 −2  s −1 at temperatures as low as 1150 °C which is impossible to obtain by using conventional Forming methods. Furthermore, a powder compact can be directly shaped into a complex shape, combining sintering and Forming into one step. The product is fully dense and free of surface cracks. These results indicate that SPS can be a very competitive Forming Tool for ceramics as well other hard materials.

  • Spark plasma sintering: A high strain rate low temperature Forming Tool for ceramics
    Materials Science and Engineering A, 2007
    Co-Authors: Dongtao Jiang, Dustin M. Hulbert, Joshua David Kuntz, Umberto Anselmi-tamburini, Amiya K. Mukherjee
    Abstract:

    Spark plasma sintering (SPS) technique is being widely used to produce nanocrystalline materials by virtue of rapid sintering at relatively lower temperatures. In this investigation, fully dense Al2O3-ZrO2-MgAl2O4composite was superplastically formed into a complex shape using SPS equipment with a strain rate of approximately 10-2s-1at temperatures as low as 1150 °C which is impossible to obtain by using conventional Forming methods. Furthermore, a powder compact can be directly shaped into a complex shape, combining sintering and Forming into one step. The product is fully dense and free of surface cracks. These results indicate that SPS can be a very competitive Forming Tool for ceramics as well other hard materials. © 2006 Elsevier B.V. All rights reserved.

B. Podgornik - One of the best experts on this subject based on the ideXlab platform.

  • Hard PVD coatings and their perspectives in Forming Tool applications
    2020
    Co-Authors: B. Podgornik, S Hogmark
    Abstract:

    The aim of the present work was to investigate the potential of using hard PVD coatings on Forming Tools. Tribological evaluation of TiN, TiB2, TaC and DLC coatings deposited on a cold work Tool steel was carried out in a loadscanning test rig and compared to the behaviour of different uncoated Forming Tool steels. The special test configuration, where austenitic stainless steel was used as a counter-material, makes it possible to gradually increase the normal load during forward sliding strokes and to correspondingly decrease the load during postreversed ones. In this investigation, the load range was 100 to 1300 N (1 to 5.1 GPa). Experimental results indicate that introduction of a proper hard coating will lead to an improved wear resistance and a longer lifetime of the Forming Tool. Furthermore, by using hard low-friction coatings excellent anti-sticking properties can be obtained.

  • proper coating selection for improved galling performance of Forming Tool steel
    Wear, 2006
    Co-Authors: B. Podgornik, S Hogmark, O Sandberg
    Abstract:

    Abstract The aim of the present work was to investigate and compare different hard coatings as to the tendency for work material adhesion and galling properties when applied on Forming Tool steel and sliding against different work materials. The surface coatings included were PVD deposited TiN, TiB2, VN, TaC and DLC coatings. They were all applied to cold work Tool steel. Tribological evaluation was carried out in a load-scanning test rig, with the normal load being gradually increased during each test from 100 to 1300 N (1–3.5 GPa). The coated steel was tested against austenitic stainless steel and alloys of aluminium and titanium. This investigation clearly indicates that work material adhesion and galling performance of coated Forming Tool steel greatly depends on the type of work material. In the case of stainless steel, carbon-based coatings provide the best protection against the work material transfer, while Forming of aluminium and titanium alloys, requires nitride type coatings, such as TiN.

  • Influence of surface roughness and coating type on galling properties of Forming Tools
    Proceedings of the International Conference on Recent Advances in Manufacture & Use of Tools & Dies and Stamping of Steel Sheets, 2005
    Co-Authors: S Hogmark, B. Podgornik, Oskar Sandberg
    Abstract:

    The aim of the present work is to elucidate the influence of surface roughness and surface material on the sticking and galling properties of Forming Tool steel. The tribological evaluation included a cold work Tool steels (UHB Vanadis 4) both uncoated and PVD-coated with TiN, TiB2, TaC, WC/C and VN. Representing a material difficult to form, austenitic stainless steel was used as a counter-material. A special test configuration made it possible to gradually increase the normal load during forward sliding strokes, and to correspondingly decrease the load during reversed ones. In this investigation, the load was varied between 100 and 2500 N, corresponding to a contact pressure between 2 and 5 GPa. The main observation is that the galling and anti-sticking properties of the Tool surface dramatically improve by reducing the surface topography. On the other hand, a carbon-based (DLC) coating or a TaC coating leads to a reduced probability of work material adhesion even at relatively high surface roughness values and under starved lubrication. However, if the Tool is going to be coated, the very best result is obtained if the substrate is polished prior to coating deposition, and the coating is given a light polish afterwards. One of the most commonly used PVD coatings (TiN) does not improve the galling properties of Forming Tools when used for austenitic stainless steel. An uncoated polished Tool steel may even show a better performance than a TiN-coated Tool of the same surface roughness. However, VN may be the ultimate coating material solution

  • influence of surface roughness and coating type on the galling properties of coated Forming Tool steel
    Surface & Coatings Technology, 2004
    Co-Authors: B. Podgornik, S Hogmark, O Sandberg
    Abstract:

    Abstract The aim of the present work is to elucidate the influence of surface roughness on the galling properties of coated Forming Tool steel. The tribological evaluation included TiN, TiB 2 , TaC and WC/C coatings deposited on cold work Tool steel. Representing a material difficult to form, austenitic stainless steel was used as a counter-material. A special test configuration made it possible to gradually increase the normal load during forward sliding strokes, and to correspondingly decrease the load during reversed ones. In this investigation, the load was varied between 100 and 1300 N, corresponding to a contact pressure between 2 and 5 GPa. The main observation is that the galling and anti-sticking properties of the Tool surface dramatically improve by reducing the surface topography. Consequently, reduced substrate roughness or polishing of the contact surface after coating is highly recommended. However, selection of a carbon-based low-friction coating leads to reduced probability of worked material adhesion even at high surface roughness values and under starved lubrication.

  • Wear resistance and anti-sticking properties of duplex treated Forming Tool steel
    Wear, 2003
    Co-Authors: B. Podgornik, Oskar Sandberg, S Hogmark, Vojteh Leskovšek
    Abstract:

    The aim of this work was to investigate the potential of using hard physical vapour deposition (PVD) coatings on Forming Tools, as well as to determine the influence of plasma nitriding on the load-carrying capacity and wear resistance of coated Tool surfaces. A load-scanning test rig was used for evaluation, where duplex treated cold work Tool steel samples were loaded against soft austenitic stainless steel and hardened ball bearing steel, respectively. Four different coatings (TiN, TiB2, TaC and DLC) and two substrate treatments (hardening and plasma nitriding in two different gas mixtures) were included. Plasma nitriding alone significantly improved the friction, wear, and anti-sticking properties of the Tool steel. PVD coating, and especially PVD coating of nitrided Tool steel further improved the performance. Therefore, from the point of view of Tool life as well as work peace surface quality, the DLC coating with its excellent anti-sticking properties and sufficiently good wear resistance represent the best solution for Forming Tool applications of austenitic stainless steel.