Dalian University of Technology

Other

Nippon Steel Corporation

Tingju Li

Zongning Chen

Yiping Lu

Enyu Guo

Tongmin Wang

Jinchuan Jie

Huijun Kang

Zhiqiang Cao

Yubo Zhang

Eiichi Takeuchi

Takehiko Toh

Shigeo Asai

Kenzo Sawada

Kiyoshi Wajima

Kensuke Sassa

Huanzhi Zhang

Jianbo Li

A CaTiO-based oxide thermoelectric material and a preparation method thereof are disclosed. The CaTiO-based oxide thermoelectric material has a chemical formula of CaLaTiO, where 0<x≤0.4. The present disclosure makes it possible to prepare a CaTiO-based thermoelectric material with properties comparable to n-type ZnO, CaTiO, SrTiOand other oxide thermoelectric materials. Among them, the La15 sample has a power factor reaching up to 8.2 μWcmK(at about 1000 K), and a power factor reaching up to 9.2 μWcmKat room temperature (about 300 K); and a conductivity reaching up to 2015 Scm(at 300 K). The CaTiO-based oxide thermoelectric material exhibits the best thermoelectric performance among calcium titanate ceramics. The method for preparing the CaTiO-based oxide thermoelectric material of the present disclosure is simple in process, convenient in operation, low in cost, and makes it possible to prepare a CaTiO-based ceramic sheet with high thermoelectric performance.

CaTiO-based oxide thermoelectric material and preparation method thereof

A radiation resistant high-entropy alloy is provided, having an FCC structure, defined by general formula of FeCoNiVMoTiCr, where 0.05&#x2264;x&#x2264;0.2, 0.05&#x2264;y&#x2264;0.3, x and y are molar ratios. The radiation resistant high-entropy alloy has excellent irradiation resistance and is subject to radiation hardening saturation at high temperature (600&#xb0; C.) in a condition of a high dose (1-3&#xd7;10ions/cm) of helium ion irradiation. A lattice constant of the high-entropy alloy decreases abnormally after irradiation. The high-entropy alloy has a radiation resistance far higher than that of a conventional alloy and has an excellent plasticity and specific strength. In an as-cast condition and at room temperature, a tensile break strength of the high-entropy alloy is higher than 580 MPa, an engineering strain (a tensile elongation) of the high-entropy alloy is greater than 30%.

Radiation resistant high-entropy alloy having FCC structure and preparation method thereof

The present invention provides a radiation resistant high-entropy alloy and a preparation method thereof. A general formula of the radiation resistant high-entropy alloy is TiZrHfVMoTaNb, where 0.05&#x2264;x&#x2264;0.25, 0.05&#x2264;y&#x2264;0.5, and x and y are molar ratios. The preparation method of the radiation resistant high-entropy alloy comprises the following steps: mixing Ti, Zr, Hf, V, Mo, Ta, and Nb in order, and conducting vacuum levitation induction melting or vacuum arc melting, to obtain the radiation resistant high-entropy alloy. The high-entropy alloy in the present invention has an excellent irradiation resistance, and does not suffer radiation hardening damage under simulated helium ion irradiation. When helium bubbles are of same sizes as those of conventional alloy, the bubble density of the high-entropy alloy is far lower than that of the conventional alloy, and the lattice constant thereof decreases abnormally after irradiation.

Radiation resistant high-entropy alloy and preparation method thereof

An object of the present invention is to provide a process for continuously casting a molten metal which process suppresses the instability of the initial solidification and stably improves the lubrication and the surface properties of the cast metal, and an apparatus therefore, in the process for continuously casting a molten metal an alternating current is applied to an electromagnetic coil which is provided so that it surrounds a continuous casting mold wall or is embedded in the side wall of the mold, whereby an electromagnetic force is exerted on the molten metal poured into the mold which either oscillates in a constant mode or does not oscillate and is starting to be solidified the process of the present invention also comprises periodically changing the amplitude or waveform of the alternating current to be applied, and the apparatus of the present invention is used for the process.

Apparatus for continuous casting of metal

Process for continuous casting of molten metal and apparatus for the same

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Dalian, China

Tingju Li