The Experts below are selected from a list of 14769 Experts worldwide ranked by ideXlab platform
Frank E. Talke - One of the best experts on this subject based on the ideXlab platform.
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Thermal Insulator design for optimizing the efficiency of Thermal flying height control sliders
Journal of Applied Physics, 2009Co-Authors: Chia-ti Yin, Frank E. TalkeAbstract:This paper is concerned with the optimization of the location and size of Thermal flying height control (TFC) elements in magnetic recording sliders. It investigated the performance of a so-called Thermal Insulator positioned adjacent to the heater to control the temperature distribution inside the slider. A parametric study of the Thermal conductivity, thickness, and location of the Thermal Insulator was performed to improve the Thermal actuation and Thermal efficiency. Optimization of the dimensions and properties of a Thermal Insulator was found to achieve a substantial reduction in the flying height of the read/write elements. In addition, the magnitude of the Thermal actuation was found to increase.
Jingyang Wang - One of the best experts on this subject based on the ideXlab platform.
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Porous γ-(Y1-xHox)2Si2O7 Thermal Insulator with excellent high-temperature strength retention and very low Thermal conductivity
Journal of The European Ceramic Society, 2018Co-Authors: Zhen Wu, Wanpeng Hu, Jingyang WangAbstract:Abstract High-temperature Thermal insulation materials challenge extensive candidates with good mechanical, Thermal and chemical reliability at high temperatures. Recently, porous γ-Y2Si2O7 was indicated a promising Thermal Insulator in harsh environment; however, its strength at 1300 °C reduced to 34% of that at room temperature. In this work, we significantly improved its high-temperature strength by doping Ho. Highly porous γ-(Y1-xHox)2Si2O7 solid solution was fabricated by in-situ foam-gelcasting method. Especially, porous γ-(Y2/3Ho1/3)2Si2O7 demonstrated the optimal high-temperature strength, for instance 65% retention at 1300 °C, as well as high compressive strength (13.9 MPa) and low Thermal conductivity (0.186 W/(m K)) at room temperature, at the porosity of 79.3%. Interestingly, porous solid solution sample displayed obviously lower Thermal conductivity than the two end pure-phase porous materials. Porous γ-(Y1-xHox)2Si2O7 solid solution is clearly highlighted as a promising high-temperature Thermal Insulator with outstanding high-temperature strength retention and optimal low Thermal conductivity.
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Fiber reinforced highly porous γ-Y2Si2O7 ceramic fabricated by foam-gelcasting-freeze drying method
Scripta Materialia, 2018Co-Authors: Luchao Sun, Jingjing Pan, Jingyang WangAbstract:Abstract Advanced Thermal Insulators request excellent properties, including low Thermal conductivity, lightweight (high porosity) and high strength. It was a challenge to coordinatively achieve extremely high porosity (> 90%) and high strength. We herein report a foam-gelcasting-freeze drying method to process highly porous ceramic. Yttria-Stabilized Zirconia (YSZ) fiber strengthening approach is incorporated to enhance its mechanical property. Our YSZ fiber reinforced porous γ-Y 2 Si 2 O 7 ceramic shows very high porosity (92.9%), high compressive strength (1.35 MPa), and extremely low Thermal conductivity (0.090 W/(m·K)). The developed highly porous composite is a promising high-temperature Thermal Insulator.
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Porous Nano-SiC as Thermal Insulator: Wisdom on Balancing Thermal Stability, High Strength and Low Thermal Conductivity
Materials research letters, 2016Co-Authors: Zhen Wu, Hui Zhang, Jingyang WangAbstract:We herein show that by integrating nano-scale phonon-scattering mechanisms, such as interfaces and stacking faults Thermal resistances in porous nano-SiC, this outstanding material (with intrinsic very high Thermal conductivity) could demonstrate promising Thermal insulation property. Porous nano-SiC prepared at 1,500°C exhibits a specific balanced mechanical strength (compressive and flexural strength are 26 and 13 MPa, respectively, with 57% porosity) and extremely low Thermal conductivity (2 W m−1 K−1 at 300 K); and sample sintered at 1,800°C shows excellent mechanical strength but relatively high Thermal conductivity. Our work reports the novel low Thermal conductivity of porous nano-SiC for the first time.
Chia-ti Yin - One of the best experts on this subject based on the ideXlab platform.
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Thermal Insulator design for optimizing the efficiency of Thermal flying height control sliders
Journal of Applied Physics, 2009Co-Authors: Chia-ti Yin, Frank E. TalkeAbstract:This paper is concerned with the optimization of the location and size of Thermal flying height control (TFC) elements in magnetic recording sliders. It investigated the performance of a so-called Thermal Insulator positioned adjacent to the heater to control the temperature distribution inside the slider. A parametric study of the Thermal conductivity, thickness, and location of the Thermal Insulator was performed to improve the Thermal actuation and Thermal efficiency. Optimization of the dimensions and properties of a Thermal Insulator was found to achieve a substantial reduction in the flying height of the read/write elements. In addition, the magnitude of the Thermal actuation was found to increase.
Zhen Wu - One of the best experts on this subject based on the ideXlab platform.
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Porous γ-(Y1-xHox)2Si2O7 Thermal Insulator with excellent high-temperature strength retention and very low Thermal conductivity
Journal of The European Ceramic Society, 2018Co-Authors: Zhen Wu, Wanpeng Hu, Jingyang WangAbstract:Abstract High-temperature Thermal insulation materials challenge extensive candidates with good mechanical, Thermal and chemical reliability at high temperatures. Recently, porous γ-Y2Si2O7 was indicated a promising Thermal Insulator in harsh environment; however, its strength at 1300 °C reduced to 34% of that at room temperature. In this work, we significantly improved its high-temperature strength by doping Ho. Highly porous γ-(Y1-xHox)2Si2O7 solid solution was fabricated by in-situ foam-gelcasting method. Especially, porous γ-(Y2/3Ho1/3)2Si2O7 demonstrated the optimal high-temperature strength, for instance 65% retention at 1300 °C, as well as high compressive strength (13.9 MPa) and low Thermal conductivity (0.186 W/(m K)) at room temperature, at the porosity of 79.3%. Interestingly, porous solid solution sample displayed obviously lower Thermal conductivity than the two end pure-phase porous materials. Porous γ-(Y1-xHox)2Si2O7 solid solution is clearly highlighted as a promising high-temperature Thermal Insulator with outstanding high-temperature strength retention and optimal low Thermal conductivity.
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Porous Nano-SiC as Thermal Insulator: Wisdom on Balancing Thermal Stability, High Strength and Low Thermal Conductivity
Materials research letters, 2016Co-Authors: Zhen Wu, Hui Zhang, Jingyang WangAbstract:We herein show that by integrating nano-scale phonon-scattering mechanisms, such as interfaces and stacking faults Thermal resistances in porous nano-SiC, this outstanding material (with intrinsic very high Thermal conductivity) could demonstrate promising Thermal insulation property. Porous nano-SiC prepared at 1,500°C exhibits a specific balanced mechanical strength (compressive and flexural strength are 26 and 13 MPa, respectively, with 57% porosity) and extremely low Thermal conductivity (2 W m−1 K−1 at 300 K); and sample sintered at 1,800°C shows excellent mechanical strength but relatively high Thermal conductivity. Our work reports the novel low Thermal conductivity of porous nano-SiC for the first time.
Janez Dolinšek - One of the best experts on this subject based on the ideXlab platform.
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complex ɛ phases in the al pd transition metal systems towards a combination of an electrical conductor with a Thermal Insulator
Journal of Alloys and Compounds, 2008Co-Authors: Ana Smontara, Benjamin Grushko, Zvonko Jaglicic, Stanislav Vrtnik, Igor Smiljanic, Ante Bilusic, S Balanetskyy, Janez DolinšekAbstract:-Phases in the Al–Pd–(Mn,Fe,Co,Rh, ... ) alloy systems form in wide compositional ranges and belong to the interesting class of complex intermetallics that are characterized by giant unit cells with quasicrystals-like cluster substructure. In order to see how the exceptional structural complexity and the coexistence of two competing physical length scales affect the physical properties of the material, we performed investigation of the magnetic, electrical, Thermal transport and thermoelectric properties of the -phases in the Al–Pd–Fe, Al–Pd–Co and Al–Pd–Rh systems. Magnetic measurements reveal that the materials are diamagnetic, containing tiny fractions of magnetic transition–metal atoms (of the order 10–100 ppm). Electrical resistivity is moderate, of the order 10 2 � cm, and shows weak temperature dependence (in most cases of a few %) in the investigated temperature range 4–300 K. An interesting feature of the -phases is their low Thermal conductivity, which is at room temperature comparable to that of Thermal Insulators amorphous SiO2 and Zr/YO2 ceramics. While SiO2 and Zr/YO2 are also electrical Insulators,-phases exhibit electrical conductivity typical of metallic alloys, so that they offer an interesting combination of an electrical conductor with a Thermal Insulator. The reason for the weak Thermal conductivity of the-phases appears to be structural: large and heavy atomic clusters of icosahedral symmetry in the giant unit cell prevent the propagation of extended phonons, so that the lattice can no more efficiently participate in the heat transport. The thermoelectric power of the investigated -phase families is small, so that these materials do not appear promising candidates for the thermoelectric application.
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Complex ɛ-phases in the Al–Pd-transition–metal systems: Towards a combination of an electrical conductor with a Thermal Insulator
Journal of Alloys and Compounds, 2008Co-Authors: Ana Smontara, Igor Smiljanić, Benjamin Grushko, Ante Bilušić, Stanislav Vrtnik, S Balanetskyy, Z. Jagličić, Janez DolinšekAbstract:epsilon-Phases in the Al-Pd-(Mn,Fe,Co,Rh,..,) alloy systems form in wide compositional ranges and belong to the interesting class of complex intermetallics that are characterized by giant unit cells with quasicrystals-like cluster substructure. In order to see how the exceptional structural complexity and the coexistence of two competing physical length scales affect the physical properties of the material, we performed investigation of the magnetic, electrical, Thermal transport and thermoelectric properties of the epsilon-phases in the Al-Pd-Fe, Al-Pd-Co and Al-Pd-Rh systems. Magnetic measurements reveal that the materials are diamagnetic, containing tiny fractions of magnetic transition-metal atoms (of the order 10-100 ppm). Electrical resistivity is moderate, of the order 10(2) mu Omega cm, and shows weak temperature dependence (in most cases of a few %) in the investigated temperature range 4-300 K. An interesting feature of the epsilon-phases is their low Thermal conductivity, which is at room temperature comparable to that of Thermal Insulators amorphous SiO2 and Zr/YO2 ceramics. While SiO2 and Zr/YO2 are also electrical Insulators, E-phases exhibit electrical conductivity typical of metallic alloys, so that they offer an interesting combination of an electrical conductor with a Thermal Insulator. The reason for the weak Thermal conductivity of the e-phases appears to be structural: large and heavy atomic clusters of icosahedral symmetry in the giant unit cell prevent the propagation of extended phonons, so that the lattice can no more efficiently participate in the heat transport. The thermoelectric power of the investigated epsilon-phase families is small, so that these materials do not appear promising candidates for the thermoelectric application. (c) 2006 Elsevier B.V. All rights reserved
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Complex epsilon-phases in the AlPd-transition metal systems: Towards a combination of an electrical conductor with a Thermal Insulator
2007Co-Authors: Ana Smontara, Igor Smiljanić, S. S. Balanetsky, Benjamin Grushko, Ante Bilušić, Zvonko Jaglicic, Stanislav Vrtnik, Janez DolinšekAbstract:Epsilon-phases in the AlPd(Mn, Fe, Co, Rh, . . .) alloy systems form in wide compositional ranges and belong to the interesting class of complex intermetallics that are characterized by giant unit cells with quasicrystals-like cluster substructure. In order to see how the exceptional structural complexity and the coexistence of two competing physical length scales affect the physical properties of the material, we performed investigation of the magnetic, electrical, Thermal transport and thermoelectric properties of the epsilon-phases in the AlPdFe, AlPdCo and AlPdRh systems. Magnetic measurements reveal that the materials are diamagnetic, containing tiny fractions of magnetic transition metal atoms (of the order 10 - 100 ppm). Electrical resistivity is moderate, of the order 102 mikro cm, and shows weak temperature dependence (in most cases of a few %) in the investigated temperature range 4 -300 K. An interesting feature of the epsilon-phases is their low Thermal conductivity, which is at room temperature comparable to that of Thermal Insulators amorphous SiO2 and Zr/YO2 ceramics. While SiO2 and Zr/YO2 are also electrical Insulators, epsilon-phases exhibit electrical conductivity typical of metallic alloys, so that they offer an interesting combination of an electrical conductor with a Thermal Insulator. The reason for the weak Thermal conductivity of the epsilon-phases appears to be structural: large and heavy atomic clusters of icosahedral symmetry in the giant unit cell prevent the propagation of extended phonons, so that the lattice can no more efficiently participate in the heat transport. The thermoelectric power of the investigated epsilon-phase families is small, so that these materials do not appear promising candidates for the thermoelectric application.
