The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform

David L Dl Bourell - One of the best experts on this subject based on the ideXlab platform.

  • Producing metal parts with selective laser sintering/Hot Isostatic Pressing
    JOM, 1999
    Co-Authors: Suman Das, Martin Wohlert, Joseph Jr Beaman, David L Dl Bourell
    Abstract:

    Selective laser sintering/Hot Isostatic Pressing is a hybrid direct laser fabrication method that combines the strengths of both processes. Selective laser sintering can produce complexly shaped metal components with an integral, gas-impermeable skin. These components can then be directly post-processed to full density by containerless Hot Isostatic Pressing. The use of the hybrid fabrication method, envisioned as a rapid, low-cost replacement for conventional metal-can Hot Isostatic Pressing, is currently being studied for alloy 625 and Ti-6Al-4V alloys. The microstructure and mechanical properties of selective-laser-sintering processed and Hot Isostatically pressed post-processed material compare well with those of conventionally processed material.

  • producing metal parts with selective laser sintering Hot Isostatic Pressing
    JOM, 1998
    Co-Authors: Martin Wohlert, Joseph Jr Beaman, David L Dl Bourell
    Abstract:

    Selective laser sintering/Hot Isostatic Pressing is a hybrid direct laser fabrication method that combines the strengths of both processes. Selective laser sintering can produce complexly shaped metal components with an integral, gas-impermeable skin. These components can then be directly post-processed to full density by containerless Hot Isostatic Pressing. The use of the hybrid fabrication method, envisioned as a rapid, low-cost replacement for conventional metal-can Hot Isostatic Pressing, is currently being studied for alloy 625 and Ti-6Al-4V alloys. The micro-structure and mechanical properties of selective-laser-sintering processed and Hot Isostatically pressed post-processed material compare well with those of conventionally processed material.

Zhijian James Shen - One of the best experts on this subject based on the ideXlab platform.

  • Transparent alumina ceramics densified by a combinational approach of spark plasma sintering and Hot Isostatic Pressing
    Journal of the European Ceramic Society, 2016
    Co-Authors: Martin Trunec, Jens Klimke, Zhijian James Shen
    Abstract:

    In order to increase the in-line transmission of fine transparent alumina in visible light the grain growth during sintering of alumina ceramics was supressed using a combined densification process. This process combines presintering of a green body by spark plasma sintering with final Hot Isostatic Pressing. The presintering by spark plasma sintering provided bodies with a substantially smaller grain size than pressureless presintering. It is shown that the fine-grained presintered microstructure could be retained during final Hot Isostatic Pressing and alumina ceramics doped with spinel and zirconia nanoparticles in particular could be sintered to full density with only minor grain growth during final Hot Isostatic Pressing. The novel combined densification process enhanced by the unique nanoparticle doping approach provided fully dense alumina ceramics with an average grain size of 237 nm and an in-line transmission of 76.2% at a wavelength of 632.8 nm and a sample thickness of 0.8 mm.

Martin Trunec - One of the best experts on this subject based on the ideXlab platform.

  • Transparent alumina ceramics densified by a combinational approach of spark plasma sintering and Hot Isostatic Pressing
    Journal of the European Ceramic Society, 2016
    Co-Authors: Martin Trunec, Jens Klimke, Zhijian James Shen
    Abstract:

    In order to increase the in-line transmission of fine transparent alumina in visible light the grain growth during sintering of alumina ceramics was supressed using a combined densification process. This process combines presintering of a green body by spark plasma sintering with final Hot Isostatic Pressing. The presintering by spark plasma sintering provided bodies with a substantially smaller grain size than pressureless presintering. It is shown that the fine-grained presintered microstructure could be retained during final Hot Isostatic Pressing and alumina ceramics doped with spinel and zirconia nanoparticles in particular could be sintered to full density with only minor grain growth during final Hot Isostatic Pressing. The novel combined densification process enhanced by the unique nanoparticle doping approach provided fully dense alumina ceramics with an average grain size of 237 nm and an in-line transmission of 76.2% at a wavelength of 632.8 nm and a sample thickness of 0.8 mm.

Freddy Yin Chiang Boey - One of the best experts on this subject based on the ideXlab platform.

  • cold Hot Isostatic Pressing of mar m200 superalloy powders
    Journal of Materials Processing Technology, 1997
    Co-Authors: L S Ng, Freddy Yin Chiang Boey
    Abstract:

    Abstract Powder metallurgy based on cold Isostatic Pressing, vacuum sintering and Hot Isostatic Pressing (HIP) reveals the possibilities of mass producing critical parts in near net shape. The multi-stage process consists of: (i) cold Isostatic compaction to a green perform; (ii) supersolidus vacuum sintering of compact to more than 90% density; and (iii) final consolidation via Hot Isostatic Pressing to densify the preform. Three-point flexural tests were carried out on the sintered and HIPped specimens. Microstructure and porosity evaluations were conducted using scanning electron microscopy and image analysis.

P A Carvalho - One of the best experts on this subject based on the ideXlab platform.

  • consolidation of w ta composites Hot Isostatic Pressing and spark and pulse plasma sintering
    Fusion Engineering and Design, 2015
    Co-Authors: M Dias, F Guerreiro, J B Correia, A Galatanu, Marcin Rosinski, M A Monge, A Munoz, E Alves, P A Carvalho
    Abstract:

    Abstract Composites consisting of tantalum fiber/powder dispersed in a nanostructured W matrix have been consolidated by spark and pulse plasma sintering as well as by Hot Isostatic Pressing. The microstructural observations revealed that the tungsten–tantalum fiber composites consolidated by Hot Isostatic Pressing and pulse plasma sintering presented a continuous layer of Ta2O5 phase at the W/Ta interfaces, while the samples consolidated by spark plasma sintering evidenced a Ta + Ta2O5 eutectic mixture due to the higher temperature of this consolidation process. Similar results have been obtained for the tungsten–tantalum powder composites. A (W, Ta) solid solution was detected around the prior nanostructured W particles in tungsten–tantalum powder composites consolidated by spark and pulse plasma sintering. Higher densifications were obtained for composites consolidated by Hot Isostatic Pressing and pulse plasma sintering.

  • Consolidation of W–Ta composites: Hot Isostatic Pressing and spark and pulse plasma sintering
    Fusion Engineering and Design, 2015
    Co-Authors: M Dias, F Guerreiro, J B Correia, A Galatanu, M A Monge, A Munoz, E Alves, M. Rosiński, P A Carvalho
    Abstract:

    Composites consisting of tantalum fiber/powder dispersed in a nanostructured W matrix have been consolidated by spark and pulse plasma sintering as well as by Hot Isostatic Pressing. The microstructural observations revealed that the tungsten–tantalum fiber composites consolidated by Hot Isostatic Pressing and pulse plasma sintering presented a continuous layer of Ta2O5 phase at the W/Ta interfaces, while the samples consolidated by spark plasma sintering evidenced a Ta + Ta2O5 eutectic mixture due to the higher temperature of this consolidation process. Similar results have been obtained for the tungsten–tantalum powder composites. A (W, Ta) solid solution was detected around the prior nanostructured W particles in tungsten–tantalum powder composites consolidated by spark and pulse plasma sintering. Higher densifications were obtained for composites consolidated by Hot Isostatic Pressing and pulse plasma sintering