The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform

Jens Klimke - One of the best experts on this subject based on the ideXlab platform.

  • Influence of the structure of MgO·nAl2O3 spinel lattices on transparent Ceramics Processing and properties
    Journal of The European Ceramic Society, 2012
    Co-Authors: Andreas Krell, Katja Waetzig, Jens Klimke
    Abstract:

    Abstract It is demonstrated that a complete elimination of pores on sintering is governed not only by the size of the ceramic powder particles and by the homogeneity of their mutual coordination but similarly strongly by the state of the crystal lattice: with different cation disorder at fixed stoichiometry ( n  = 1) the sintering temperatures may differ by as much as 200 °C at constant powder particle size and equal homogeneity of the green bodies. Additionally, the impact of stoichiometry was investigated over the range between n  = 1 and n  = 3 with retarded reactive sintering at moderately increased Al 2 O 3 concentrations but promoted densification of alumina-rich compositions. Taking advantage of the observed effects, sintered spinel Ceramics were derived by reactive sintering of undoped MgO/Al 2 O 3 mixtures resulting in an in-line transmittance which equals spinel single crystals of similar composition from 200 nm wave length up to the IR range.

  • influence of the structure of mgo nal2o3 spinel lattices on transparent Ceramics Processing and properties
    Journal of The European Ceramic Society, 2012
    Co-Authors: Andreas Krell, Katja Waetzig, Jens Klimke
    Abstract:

    Abstract It is demonstrated that a complete elimination of pores on sintering is governed not only by the size of the ceramic powder particles and by the homogeneity of their mutual coordination but similarly strongly by the state of the crystal lattice: with different cation disorder at fixed stoichiometry ( n  = 1) the sintering temperatures may differ by as much as 200 °C at constant powder particle size and equal homogeneity of the green bodies. Additionally, the impact of stoichiometry was investigated over the range between n  = 1 and n  = 3 with retarded reactive sintering at moderately increased Al 2 O 3 concentrations but promoted densification of alumina-rich compositions. Taking advantage of the observed effects, sintered spinel Ceramics were derived by reactive sintering of undoped MgO/Al 2 O 3 mixtures resulting in an in-line transmittance which equals spinel single crystals of similar composition from 200 nm wave length up to the IR range.

Andreas Krell - One of the best experts on this subject based on the ideXlab platform.

  • Influence of the structure of MgO·nAl2O3 spinel lattices on transparent Ceramics Processing and properties
    Journal of The European Ceramic Society, 2012
    Co-Authors: Andreas Krell, Katja Waetzig, Jens Klimke
    Abstract:

    Abstract It is demonstrated that a complete elimination of pores on sintering is governed not only by the size of the ceramic powder particles and by the homogeneity of their mutual coordination but similarly strongly by the state of the crystal lattice: with different cation disorder at fixed stoichiometry ( n  = 1) the sintering temperatures may differ by as much as 200 °C at constant powder particle size and equal homogeneity of the green bodies. Additionally, the impact of stoichiometry was investigated over the range between n  = 1 and n  = 3 with retarded reactive sintering at moderately increased Al 2 O 3 concentrations but promoted densification of alumina-rich compositions. Taking advantage of the observed effects, sintered spinel Ceramics were derived by reactive sintering of undoped MgO/Al 2 O 3 mixtures resulting in an in-line transmittance which equals spinel single crystals of similar composition from 200 nm wave length up to the IR range.

  • influence of the structure of mgo nal2o3 spinel lattices on transparent Ceramics Processing and properties
    Journal of The European Ceramic Society, 2012
    Co-Authors: Andreas Krell, Katja Waetzig, Jens Klimke
    Abstract:

    Abstract It is demonstrated that a complete elimination of pores on sintering is governed not only by the size of the ceramic powder particles and by the homogeneity of their mutual coordination but similarly strongly by the state of the crystal lattice: with different cation disorder at fixed stoichiometry ( n  = 1) the sintering temperatures may differ by as much as 200 °C at constant powder particle size and equal homogeneity of the green bodies. Additionally, the impact of stoichiometry was investigated over the range between n  = 1 and n  = 3 with retarded reactive sintering at moderately increased Al 2 O 3 concentrations but promoted densification of alumina-rich compositions. Taking advantage of the observed effects, sintered spinel Ceramics were derived by reactive sintering of undoped MgO/Al 2 O 3 mixtures resulting in an in-line transmittance which equals spinel single crystals of similar composition from 200 nm wave length up to the IR range.

Katja Waetzig - One of the best experts on this subject based on the ideXlab platform.

  • Influence of the structure of MgO·nAl2O3 spinel lattices on transparent Ceramics Processing and properties
    Journal of The European Ceramic Society, 2012
    Co-Authors: Andreas Krell, Katja Waetzig, Jens Klimke
    Abstract:

    Abstract It is demonstrated that a complete elimination of pores on sintering is governed not only by the size of the ceramic powder particles and by the homogeneity of their mutual coordination but similarly strongly by the state of the crystal lattice: with different cation disorder at fixed stoichiometry ( n  = 1) the sintering temperatures may differ by as much as 200 °C at constant powder particle size and equal homogeneity of the green bodies. Additionally, the impact of stoichiometry was investigated over the range between n  = 1 and n  = 3 with retarded reactive sintering at moderately increased Al 2 O 3 concentrations but promoted densification of alumina-rich compositions. Taking advantage of the observed effects, sintered spinel Ceramics were derived by reactive sintering of undoped MgO/Al 2 O 3 mixtures resulting in an in-line transmittance which equals spinel single crystals of similar composition from 200 nm wave length up to the IR range.

  • influence of the structure of mgo nal2o3 spinel lattices on transparent Ceramics Processing and properties
    Journal of The European Ceramic Society, 2012
    Co-Authors: Andreas Krell, Katja Waetzig, Jens Klimke
    Abstract:

    Abstract It is demonstrated that a complete elimination of pores on sintering is governed not only by the size of the ceramic powder particles and by the homogeneity of their mutual coordination but similarly strongly by the state of the crystal lattice: with different cation disorder at fixed stoichiometry ( n  = 1) the sintering temperatures may differ by as much as 200 °C at constant powder particle size and equal homogeneity of the green bodies. Additionally, the impact of stoichiometry was investigated over the range between n  = 1 and n  = 3 with retarded reactive sintering at moderately increased Al 2 O 3 concentrations but promoted densification of alumina-rich compositions. Taking advantage of the observed effects, sintered spinel Ceramics were derived by reactive sintering of undoped MgO/Al 2 O 3 mixtures resulting in an in-line transmittance which equals spinel single crystals of similar composition from 200 nm wave length up to the IR range.

Manabu Fukushima - One of the best experts on this subject based on the ideXlab platform.

  • macro porous Ceramics Processing and properties
    International Materials Reviews, 2012
    Co-Authors: Tatsuki Ohji, Manabu Fukushima
    Abstract:

    AbstractPorous Ceramics are now expected to be used for a wide variety of industrial applications from filtration, absorption, catalysts and catalyst supports to lightweight structural components. During the last decade, tremendous efforts have been devoted for the researches on innovative Processing technologies of porous Ceramics, resulting in better control of the porous structures and substantial improvements of the properties. This article intends to review these recent progresses of porous Ceramics. Because of a vast amount of research works reported in this field these days, the review mainly focuses on macro-porous Ceramics whose pore size is larger than 50 nm. Followed by giving a general classification of porous Ceramics, a number of innovative Processing routes developed for critical control of pores are described, along with some important properties. The processes are divided into four categories including (i) partial sintering, (ii) sacrificial fugitives, (iii) replica templates and (iv) dir...

Sheng Li - One of the best experts on this subject based on the ideXlab platform.

  • Transparent Ceramics: Processing, materials and applications
    Progress in Solid State Chemistry, 2013
    Co-Authors: S.-f. Wang, D.w. Luo, Z.l. Dong, G.e.b. Tan, T.s. Zhang, Jingshu Zhang, W. X. Que, Wenxiu Que, D Y Tang, F. Gu, Sheng Li
    Abstract:

    Transparent polycrystalline Ceramics have found various applications, such as laser hosts, infrared (IR) windows/domes, lamp envelopes and transparent armors, instead of their single crystal counterparts, due mainly to their Processing flexibility in fabricating items with large sizes and complex shapes and more importantly cost-effectiveness. High optical transparent Ceramics require high purity and high density. To achieve high purity final products, it is necessary to use high purity precursor powders. To get high density, various sintering technologies have been employed, such as high-pressure (HP) sintering, high isostatic pressure (HIP) sintering, vacuum sintering and spark plasma sintering (SPS). At the same time, various wet chemical synthesis routes have been used to produce precursor powders at submicron or even nanometer scales, with significantly improved sinterability. Transparent Ceramics for armor and IR window/dome applications should have superior mechanical and thermal properties. Therefore, nanosized Ceramics and nanocomposite Ceramics have attracted much attention more recently. This review was aimed to summarize the latest progress in Processing, materials and applications of transparent Ceramics. It is arranged by starting with a brief introduction, followed by a detailed description on various sintering technologies used to develop transparent Ceramics. After that, potential applications of transparent Ceramics, together with their optical, mechanical and thermal properties, will be discussed. It will be concluded with discussions on future trend and perspectives, as well as some important issues, of transparent ceramic materials.