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High-temperature corrosion of sintered RE_(2)Si_(2)O_(7)(RE=Yb and Ho)environmental barrier coating materials by volcanic ash

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1628-1638页

作者： Ayahisa Okawa Son Thanh Nguyen Tadachika Nakayama Thi-Mai-Dung Do Hisayuki Suematsu Shu Yin Takuya Hasegawa tsuneo suzuki Takashi Goto Koichi Niihara Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-8577Japan Department of Creative Engineering National Institute of TechnologyKushiro 084-0916Japan Extreme Energy-Density Research Institute Nagaoka University of TechnologyNagaoka 940-2188Japan Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan

Rare-earth silicates are promising environmental barrier coatings(EBCs)that can protect SiC_(f)/Si C_(m)substrates in next-genera tion gas turbine ***,RE_(2)Si_(2)O_(7)(RE=Yb and Ho)shows potential as an EBC due to its coefficient of thermal expansion(CTE)compatible with substrates and high resistance to water vapor *** target operating temperature for next-generation tur bine blades is 1400°*** is inevitable during adhesion to molten volcanic ash,and thus,understanding the corrosion behavior o the material is crucial to its *** study investigates the high-temperature corrosion behavior of sintered RE_(2)Si_(2)O_(7)(RE=Yb and Ho).Samples were prepared using a solid-state reaction and hot-press *** were then exposed to volcanic ash at 1400°C for 224,and 48 *** 48 h of exposure,volcanic ash did not react with Yb_(2)Si_(2)O_(7)but penetrated its interior,causing *** Ho_(2)Si_(2)O_(7)was partially dissolved in the molten volcanic ash,forming a reaction zone that prevented volcanic ash melts from penetrating the *** increasing heat treatment time,the reaction zone expanded,and the thickness of the acicular apatite grains increased The Ca:Si ratios in the residual volcanic ash were mostly unchanged for Yb_(2)Si_(2)O_(7)but decreased considerably over time for Ho_(2)Si_(2)O_(7).Th Ca in volcanic ash was consumed and formed apatite,indicating that RE^(3+)ions with large ionic radii(Ho>Yb)easily precipitated apatit from the volcanic ash.

关键词： environmental barrier coating volcanic ash rare-earth disilicate corrosion

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Measurement of metal vapor cooling speed during nanoparticle formation by pulsed wire discharge

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中国有色金属学会会刊：英文版 2009年第B9期19卷 183-188页

作者： Yuu SHIKODA Yoshinori TOKOI Koji SUWA Satoru ISHIHARA tsuneo suzuki Tadachika NAKAYAMA Hisayuki SUEMATSU Koichi NIIHARA Extreme Energy-Density Research Institute Nagaoka University of Technology Department of Electrical and Electronic Engineering Niigata University Inovertion Satellite Niigata Japan Science and Technology Agency

Pulsed wire discharge(PWD) is one of nano-sized powder production methods. The object of this work is to study influence of the plasma/vapor/particle density using computer simulation and to establish temperature measurement method using a high-speed infrared thermometer in the PWD process. The temperature correction coefficient was obtained from geometric computer simulation results. Obtained correction coefficient was applied to the temperature measuring results. It was found from this result that obtained correction coefficient was appropriate. A temperature measurement method was established by using the high-speed infrared thermometer in PWD.

关键词：测量方法金属蒸气形成速度放电脉冲纳米导线红外线温度计计算机模拟冷却

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Material Design of Transition Metal Nitride for Hard Coating by Metal and Nonmetal Atom Substitution

Material Design of Transition Metal Nitride for Hard Coating...

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Fifth International Conference on Surface Engineering

作者： tsuneo suzuki Jun Inoue Hiroki Asami Tomoya Ibi Tadachika Nakayama Hisayuki Suematsu Koichi Niihara Extreme Energy-Density Research Institute Nagaoka University of Technology1603-1 KamitomiokaNagaokaNiigata 940-2188Japan

CrN thin films,which have been used as hard coating materials for cutting tools,plastic metal molds and friction parts,exhibit high hardness,excellent oxidation resistance and chemical ***,multi-component Cr-Me-N coatings,Me is metal elements such as Al,Si,have been explored in order to improve the properties of CrN *** only metal addition but also nonmetal addition to CrN coatings,the hardness and oxidation resistance improved by substitution of oxygen atoms for nitrogen atoms in CrN has been reported [1].Cr（N,O） is thought to be a material with O atoms substituted for some of the N atoms of CrN,in other words,it is believed to be a solid solution of CrN and CrO,although CrO is an unstable material at standard state and its existence has not been *** anticipate that it is possible to synthesis Cr-Me-N-O（Me;Mg,Cu,Mn,Ni and Cu） phase,which are dissolving the MeO into CrN in order to stabilize the chemical bonding of Cr-O,and the hardness of Cr-Me-N-O coatings is harder than Cr-Me-N and Cr-N-O *** films were deposited by the irradiation of Nd:YAG（λ = 355 nm） laser beam onto a *** disk with a diameter of 50 mm of 99 % pure Cr2N and sectored sheets of metal Me were used as the ***-crystal（100）-oriented silicon was used for *** substrate temperature was controlled at 500°*** the deposition,the chamber was evacuated to 2x10-6 Torr using rotary and *** were carried o0u.2t Taot r trh.e ammonia pressure（pNH3） of Figure 1 shows XRD patterns of the Cr-Mg-N-O thin films *** structure of main phase of all thin films was found to be B1（NaCl type） structure.

关键词： Chromium oxynitride Hard Coating substitution

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多机构回顾性分析FDG PET／CT在预测下咽鳞状细胞癌肺转移患者生存中的作用

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中华核医学与分子影像杂志 2018年第3期38卷 226-227页

作者：唐军上海交通大学医学院附属苏州九龙医院核医学科 215021

[摘要]目的研究^18F-脱氧葡萄糖（FDG） PET/CT显像最大标准摄取值（SUVmax）与来自2家机构的下咽鳞状细胞癌患者长期随访后总生存率间可能存在的相关性，分析SUVmax与几个生存状态间的关系，包括无肺转移生存。方法81例患者的生存率用... 详细信息

[摘要]目的研究^18F-脱氧葡萄糖（FDG） PET/CT显像最大标准摄取值（SUVmax）与来自2家机构的下咽鳞状细胞癌患者长期随访后总生存率间可能存在的相关性，分析SUVmax与几个生存状态间的关系，包括无肺转移生存。方法81例患者的生存率用乘积极限法（Kaplan-Meier法）计算。单变量和多变量分析采用Cox比例风险模型进行。

关键词：下咽鳞状细胞癌 ^18F-FDG PET/CT SUVmax 总生存率肺转移

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