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Pressure and temperature.Dependences of Elastic Properties of Grossular Garnet up to 17 GPa and 1 650 K

Journal of Earth Science 2010年第5期21卷 782-791页

作者： Yoshio Kono Steeve Gréaux Yuji Higo Hiroaki Ohfuji Tetsuo Irifune Geodynamics Research Center Ehime University JASRI 1-1-1 Mikazuki-cho Sayo-gun Hyogo 679-5198 Japan

Simultaneous ultrasonic elastic wave velocity and in situ synchrotron X-ray measurements on grossular garnet were carried out up to 17 GPa and 1 650 K. P- and S-wave vdoeities and bulk and shear modulus showed linear pressure and temperature.dependence. These data yielded a pressure derivative of the bulk modulus of 4.42（7） and a shear modulus of 1.27（3）, which are in good agreement with those of garnets with variable chemical compositions. temperature.dependence of the bulk modulus of grossular （-1.36×10^-2 GPafK） is also similar to that of other garnets, while the temperature.dependence of the shear modulus of grossular （-1.11×10^-2 GPa/K） is higher than those of magnesium end-member garnets and pyrolitic garnet.

关键词： elastic property grossular garnet high pressure high temperature.

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Optimal pressure-sensitive cuts for surface acoustic waves on langasite

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Science in China(Series F) 2006年第2期49卷 254-261页

作者： HAN Tao JI Xiaojun SHI Wenkang School of Electronic Information and Electrical Engineering Shanghai Jiaotong University Shanghai200240 China

The crystal langasite manifests its unique advantages and potentials for high temperature.applications due to a high electromechanical coupling coefficient, temperature.compensated orientations for surface acoustic wave （SAW）, and temperature.stability. In order to analyze the pressure-induced frequency shift in SAW resonator type sensors at high temperature. this paper presents the electroelastic wave equations employing the effective material constants for small vibrations superimposed on biases originated from homogeneous temperature.and external pressure fields in the Lagrangian description. Incorporated with the first-order perturbation integration, a model including both the mechanical and electrical perturbation items originating from thermal biases and small pressure fields is proposed. This universal model is suitable for substrate with high piezoelectricity and can be applied at either room temperature.or high temperature.circumstance. The criteria of optimal cuts for SAW pressure sensitivity, i.e., high electromechanical coupling coefficient and low temperature.coefficient of delay, are proposed. A thorough investigation in trebly rotated cuts has shown that optimal pressure sensitive crystallographic areas can be obtained. The areas suitable for pressure sensors at room temperature.are defined with Euler angles Ω1： φ=0°-0.6°, θ=144.4°-145.8°, ψ =23.2°-24.1°,Ω2： φ=59.4°-61.°, θ=34.2°-36.2°, ψ =24.1°-22.3°,Ω3： φ=119°-120°, θ=143.8°-145.5°, ψ =22.3°-23.5° The areas suitable for pressure sensors at high temperature.are defined with Euler angles Ⅰ： φ=8°-30°, θ=24°-36°, ψ =4°-25°Ⅱ： φ=30°-55°, θ=144.4°-158°, ψ =4°-28° A set of experiments employing LGS （0, 150°, 22°） and （0, 90°, 0） has been performed to check the validity of the proposed calculation. The experimental relative sensitivity is in excellent agreement with the theoretical results.

关键词： surface acoustic wave langasite pressure sensitivity high temperature.

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Estimation of Service Lives and Operating temperature.Ranges of high-temperature.Lubricating Oils Using Thermal Analysis

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Journal of Physical Science and Application 2014年第8期4卷 516-523页

作者： Fumihiko Yokoyama Fundamental Research & Engineering Dept. R&D Technology Center IHI Corporation Isogo-ku Yokohama Kanagawa Japan

Development of gas turbine oils that can be used in higher temperature.conditions remains the greatest technological challenge. Though the maximum operating temperature.of conventional lubricating oils is generally set around 100 ℃, or 140 ℃ for scavenged oils, it is predicted that the future will require oils to function at 200 ℃ or above. To find a clue to developing oils that can be used at higher temperature., this study attempted to estimate service lives and operating temperature.ranges of certain oils, including oils conforming to MIL-PRF-23699, which are deemed promising candidates for high-temperature.applications, by analyzing their reaction rates of degradation and degeneration by oxidation. Among a number of methods used in the analyses of reaction rates, this study chose thermo-gravimetry （TG）, with which estimations can be made relatively easily.

关键词： Gas turbine oil life high temperature.

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