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Synthesis of WC powder through microwave heating of WO_3–C mixture

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International Journal of Minerals,Metallurgy and Materials 2017年第2期24卷 202-207页

作者： Amir Karimzadeh Behnami Arman Hoseinpur Masoud Sakaki Mohammad Sh. Bafghi kazumichi yanagisawa School of Metallurgy and Materials Engineering Iran University of Science and Technology (IUST) Narmak Tehran 16846-13114 Iran Department of Materials Engineering Faculty of Engineering Malayer University Malayer 65719-95863 Iran Research Laboratory of Hydrothermal Chemistry Faculty of Science Kochi University Kochi 780-8073 Japan

A simple, easy, and low-cost process for the fabrication of tungsten carbide （WC） powder through microwave heating of WO3-C mixtures was developed. Thermodynamic calculations and experimental investigations were carried out for WO3-and W-C systems, and a formation mechanism was proposed. In the results, for the synthesis of WC, the use of over stoichiometric amount of C together with a spe- cially assembled experimental setup （which effectively retains heat in the system） is necessary. The WC powder is successfully obtained by heating WO3：5C mixture for 900 s in a domestic microwave oven.

关键词： tungsten carbide microwave heating carbothermic reduction thermodynamic analysis

超胞材料β-Li_2TiO_3的结构、制备及应用

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中国有色金属学报 2014年第6期24卷 1474-1485页

作者：于成龙高丹鹏王斐郝欣 kazumichi yanagisawa Sumio KAMIYA Takahiro KOZAWA 陕西科技大学材料科学与工程学院西安710021 高知大学理学院附属水热化学研究所重庆理工大学材料科学与工程学院重庆400054 陕西科技大学管理学院西安710021 丰田汽车公司大阪大学焊接研究所

综述近几年国内外有关β-Li_2TiO_3材料的结构、制备方法以及应用的研究进展。详细阐述β-Li_2-TiO_3材料的超胞结构,讨论可能存在的点缺陷,研究不同点缺陷对其超胞结构发育的影响;通过比较固相法、溶胶-凝胶法、燃烧合成法和水热合成... 详细信息

综述近几年国内外有关β-Li_2TiO_3材料的结构、制备方法以及应用的研究进展。详细阐述β-Li_2-TiO_3材料的超胞结构,讨论可能存在的点缺陷,研究不同点缺陷对其超胞结构发育的影响;通过比较固相法、溶胶-凝胶法、燃烧合成法和水热合成法等制备β-Li_2TiO_3粉体的典型方法,指出关键在于改善湿化学工艺方法,使能获得超细粉体且保证超胞发育良好。分析β-Li_2TiO_3材料在氚增殖剂、锂离子电池、发光材料和微波介质材料等领域的重要应用。

关键词： β-Li2TiO3 超胞结构缺陷固相法湿化学法应用

水热软化学法合成单轴取向钙钛矿型钛酸盐薄膜(英文)

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陕西科技大学学报（自然科学版） 2008年第3期26卷 1-5页

作者：梶芳浩二冯旗柳泽和道 RI MAN E. Richard 高知大学理学部附属水热化学实验所香川大学工学部材料创造工学科 Department of Ceramic and Materials Engineering Rutgers UniversityPiscatawayNJ 08855-0909USA

采用具有纤铁矿型层状结构的层状钛酸盐K0 .8Ti1 .73Li0 .27O4·nH2O(KTLO)制备出层状H+-型钛酸盐H1.07Ti1.73O4·nH2O( HTO) ,并将其以之作为前驱物,将HTO前驱物粉末通过与0 .1 M的n-丙胺反应剥落成其结构单元层的纳米片,接着采用HTO... 详细信息

采用具有纤铁矿型层状结构的层状钛酸盐K0 .8Ti1 .73Li0 .27O4·nH2O(KTLO)制备出层状H+-型钛酸盐H1.07Ti1.73O4·nH2O( HTO) ,并将其以之作为前驱物,将HTO前驱物粉末通过与0 .1 M的n-丙胺反应剥落成其结构单元层的纳米片,接着采用HTO纳米片胶体溶液通过旋转涂覆工艺在金属基体Ti、Pt或者Au上制备出择优取向的HTO薄膜,随后加热至200 ～400 ℃.在A(OH)2(A=Ba ,Sr)溶液中于150 ～350 ℃温度范围内水热处理HTO前驱物薄膜成功制备出具有高度[110]择优取向的ATi O3(A=Ba ,Sr)薄膜(取向因子≈1 .0) .钛酸盐薄膜择优取向的方向受控于HTO前驱物薄膜的结构且不依赖于基体的性质.

关键词：钛酸钡纳米微粒取向薄膜二氧化钛

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水热电泳沉积法制备硅酸钇涂层(英文)

陕西科技大学学报（自然科学版） 2008年第3期26卷 11-14,44页

作者：刘淼黄剑锋柳泽和道张玉涛邓飞曹丽云吴建鹏陕西科技大学材料科学与工程学院陕西西安710021 高知大学理学部水热化学研究所

以声化学法合成的纳米硅酸钇粉体为原料,异丙醇为溶剂,碘为荷电介质,采用水热电泳沉积方法在SiC-C/C复合材料表面制备出硅酸钇涂层,借助XRD和SEM对涂层的晶相组成、表面和断面的微结构形貌进行了表征,重点研究了水热电泳沉积温度对涂层... 详细信息

以声化学法合成的纳米硅酸钇粉体为原料,异丙醇为溶剂,碘为荷电介质,采用水热电泳沉积方法在SiC-C/C复合材料表面制备出硅酸钇涂层,借助XRD和SEM对涂层的晶相组成、表面和断面的微结构形貌进行了表征,重点研究了水热电泳沉积温度对涂层结构及抗氧化性能的影响.结果表明,涂层中以Y2Si2O7为主晶相,涂层的厚度和致密性随着水热温度的增加而提高;与包埋法制备的SiC涂层相比,水热电泳沉积制备的硅酸钇复相涂层具有更好的抗氧化性能,涂层试样在1 500 ℃的空气气氛下氧化35 h后失重为0 .32×10-3g/cm3.

关键词：碳/碳复合材料硅酸钇水热电泳沉积

Asphericalizing the Light Collection Mirror for the 200-Point Thomson Scattering Diagnostic Installed on the Large Helical Device

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Plasma Science and Technology 2011年第4期13卷 415-419页

作者： kazumichi NARIHARA Hiroshi HAYASHI National Institute for Fusion Science

Shown is a possibility to make the image of a laser beam over a distance of 2.5 m, formed by the spherical multi-segment mirror installed in LHD, twice sharper by suitably adjusting the inclination of each segment mirror, which is equivalent to making the mirror surface aspherical. This will further enhance the attractiveness of a mirror-based Thomson scattering system.

关键词： Thomson scattering LHD aspherical mirror

Plasma-based X-ray laser speckle and its application on ferroelectric material

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Nuclear Science and Techniques 2005年第4期16卷 193-200页

作者： TAI Ren-Zhong NAMIKAWA kazumichi Shanghai Institute of Applied Physics the Chinese Academy of Sicenees Shanghai 201800 China Department of Physics Tokyo Gakugei University. 4-1-1 Nukui-Kita Machi Koganei-Shi Tokyo 184-8501 Japan

A new type of soft X-ray source, i.e. a plasma-based X-ray laser, is found to be promising to conduct transient measurement. By means of picosecond X-ray laser speckles, the dynamic microscopic polarization clusters within cubic (paraelectric) BaTiO3 was directly observed and characterized in a microscopic scale for the first time. This opens a way to study this type of clusters, which usually manifest large external-field response for ferroelectric materials.

关键词： X射线激光铁电物质 BaTiO3

The simplest route to generating a train of attosecond pulses

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Light(Science & Applications) 2013年第1期2卷 204-208页

作者： kazumichi Yoshii John Kiran Anthony Masayuki Katsuragawa Department of Engineering Science University of Electro-CommunicationsTokyoJapan

We report on two novel routes to generating a train of attosecond pulses from a broad discrete spectrum in the near-infrared–visible–ultraviolet *** extends an integer-temporal-Talbot(ITT)concept to include high-order spectral dispersions and generates a pulse train that completely satisfies the transform-limited *** other numerically explores the optimum conditions under which we can obtain an attosecond pulse train that approximately satisfies the transform-limited *** second method is more practical than the *** of these methods is extremely simple and robust;we need only to place a few thin dispersive materials in the optical path and to adjust their thicknesses without spatially dispersing the frequency *** numerically demonstrate the generation of a train of attosecond pulses with a transform-limited pulse duration of 728 as and a repetition period of 8.03 fs in gaseous parahydrogen.

关键词： adiabatic excitation of Raman transition attosecond pulse generation integer-temporal-Talbot(ITT)method molecular modulation

Effects of Cr Content and Annealing Temperature on Microstructure and Wear Characteristics of Cast Ausferrite Nodular Iron

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Journal of Iron and Steel Research International 2015年第11期22卷 1049-1054页

作者： Jia-peng ZOU kazumichi SHIMIZU Qi-zhou CAI State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Department of Materials Science and Engineering Muroran Institute Technology

The effects of Cr content and annealing temperature on abrasive wear characteristics of cast ausferrite nodular iron were investigated with Suga type abrasive wear tester. The surface morphology and Vickers hardness of the tested samples were analyzed by scanning electron microscopy（SEM）, digital microscope and Vickers hardness tester. The results show that the cast ausferrite nodular iron could be obtained by alloying with Cr in the as-cast ductile cast iron and permanent mold casting, and the bainite content in the matrix increased with increasing Cr content. However, the decomposition of bainite took place during annealing at 500 °C to 800 °C; especially, at 800 °C, the bainite transformed into a mixture of fine lamellar pearlite and ferrite matrix structure. The wear loss of specimens was reduced with increasing Cr content in the cast ausferrite nodular iron. The wear loss of the sample cast ausferrite nodular iron with 0.4mass% Cr is the least. The wear loss began to increase while the Cr content is 0.6mass%. The wear loss of annealed ductile irons at different annealing temperatures was higher than that of as-cast samples. During the abrasive wear, the shear stress transformed austenite to martensite, and the hardness of specimens increased and the wear resistance of as-cast ductile cast iron was improved.

关键词： cast ausferrite nodular iron Cr content annealing temperature microstructure wear characteristics

A case of advanced intrahepatic cholangiocarcinoma successfully treated with chemosensitivity test-guided systemic chemotherapy

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World Journal of Gastroenterology 2009年第41期15卷 5228-5231页

作者： kazumichi Abe Takeru Wakatsuki Fumiko Katsushima Kyoko Monoe Yukiko Kanno Atsushi Takahashi Junko Yokokawa Hiromasa Ohira Department of Gastroenterology and Rheumatology Fukushima Medical University School of Medicine 1 Hikarigaoka Fukushima 960-1295 Japan

Intrahepatic cholangiocarcinoma （ICC） is a relatively rare and highly fatal neoplasm that arises from the biliary epithelium. Prognosis is generally poor and survival is limited to a few months. Here we present a case of advanced ICC successfully treated by chemosensitivity test-guided systemic chemotherapy combining S-1 and cisplatin （CDDP）. A 65-year-old woman with a liver tumor was referred to our hospital on November 21, 2007. Abdominal ultrasonography and computed tomography （CT） showed low-density masses of 50 and 15 mm in diameter, respectively in segment w of the liver and in the enlarged lymph node in the para-aorta. Ultrasonography-guided fine needle biopsy diagnosed the tumors as ICC. Since the patient was inoperable for lymph node metastasis, she underwent systemic chemotherapy with gemcitabine. Six months afcer initiation of chemotherapy, CT revealed ICC progression in the liver and pleural dissemination with pleural effusion. The patient was admitted to our hospital for anticancer drug sensitivity testing on June 9, 2008. Based on the sensitivity test results, we elected to administer systemic chemotherapy combining S-1 and CDDP. Two months into the second chemotherapy treatment, CT revealed a reduction of the tumors in the liver and lymph node and a decrease in pleural *** eight cycles of the second chemotherapy, 17 mo after ICC diagnosis, she is alive and well with no sign of recurrence. We conclude that chemosensitivity testing may effectively determine the appropriate chemotherapy regimen for advanced ICC.

关键词： Chemosensitivity testing Cholangiocarcinoma, Cisplatin Liver neoplasms Gemcitabine S-1 Systemic chemotherapy