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Structural evolution and high-temperature sensing performance of polymer-derived SiAlBCN ceramics

Journal of Advanced Ceramics 2024年第4期13卷 478-485页

作者： Chao Ma Kun Liu Pengfei Shao Daoyang Han Kang Wang Mengmeng Yang Rui Zhao Hailong Wang Rui Zhang Gang Shao School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Zhongyuan Critical Metal Laboratory Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentZhengzhou UniversityZhengzhou 450002China

In situ temperature monitoring has become extremely imperative in high-temperature harsh environments and polymer-derived ceramics(PDCs)as sensing materials have attracted great attention.However,the stability and oxidation/corrosion resistance of PDCs cannot be simultaneously achieved at the moment,limiting their practical application.Herein,polymer-derived SiAlBCN ceramics were synthesized via polymer conversion method under different pyrolysis temperatures.Their microstructure evolution,high temperature sensing properties,and stability were investigated in detail.The results show that the amorphous SiAlBCN phase grows more orderly and the size of the free carbon phase enlarges with the increasing temperature.The defect concentration displays a decreasing tendency.Concurrently,the SiAlBCN ceramics as sensing materials exhibit a good temperature-resistance property from roo temperature to 1100℃.The fabricated SiAlBCN temperature sensor possesses excellent stability,repeatability,and accuracy.Moreover,SiAlBCN ceramics exhibit distinguished oxidation/corrosion resistance after 100 h treatment at 1200℃in a water/oxygen environment,which is attributed to their low corrosive rate constant(0.57 mg/(cm^(2)·h))and oxidative rate constant(3.43 mg^(2)/(cm^(4)·h)).Therefore,polymer-derived SiAlBCN ceramics as sensing materials,which possess outstanding stability and oxidation/corrosion resistance,have great potential for in-situ monitoring of extreme environmental temperatures in the future.

关键词： polymer-derived SiAlBCN ceramics temperature sensor harsh environments oxidation and corrosion resistance

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Precision in harsh environments

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Microsystems & Nanoengineering 2016年第1期2卷 61-72页

作者： Paddy French Gijs Krijnen Fred Roozeboom Faculty of Electrical Engineering Mathematics and Computer ScienceTU DelftDelftThe Netherlands Faculty of Electrical Engineering Mathematics and Computer ScienceTwente UniversityEnschedeThe Netherlands Eindhoven University of Technology Department of Applied PhysicsPO Box 5135600 MBEindhovenThe Netherlands TNO Holst Centre High Tech Campus 215656 AEEindhovenThe Netherlands

Microsystems are increasingly being applied in harsh and/or inaccessible environments,but many markets expect the same level of functionality for long periods of time.harsh environments cover areas that can be subjected to high temperature,(bio)-chemical and mechanical disturbances,electromagnetic noise,radiation,or high vacuum.In the field of actuators,the devices must maintain stringent accuracy specifications for displacement,force,and response times,among others.These new requirements present additional challenges in the compensation for or elimination of cross-sensitivities.Many state-of-the-art precision devices lose their precision and reliability when exposed to harsh environments.It is also important that advanced sensor and actuator systems maintain maximum autonomy such that the devices can operate independently with low maintenance.The next-generation microsystems will be deployed in remote and/or inaccessible and harsh environments that present many challenges to sensor design,materials,device functionality,and packaging.All of these aspects of integrated sensors and actuator microsystems require a multidisciplinary approach to overcome these challenges.The main areas of importance are in the fields of materials science,micro/nano-fabrication technology,device design,circuitry and systems,(first-level)packaging,and measurement strategy.This study examines the challenges presented by harsh environments and investigates the required approaches.Examples of successful devices are also given.

关键词： atomic layer deposition harsh environments micro/nano-fabrication technology packaging sensors

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Hydrophobic aerogel-modified hemostatic gauze with thermal management performance

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Bioactive Materials 2023年第8期26卷 142-158页

作者： Xiaoli Jia Chao Hua Fengbo Yang Xiaoxiao Li Peng Zhao Feifan Zhou Yichi Lu Hao Liang Malcolm Xing Guozhong Lyu Engineering Research Center of the Ministry of Education for Wound Repair Technology Jiangnan UniversityAffiliated Hospital of Jiangnan UniversityWuxi214000China Wuxi School of Medicine Jiangnan UniversityWuxi214000China Medical School of Nantong University Nantong226019China Nanjing University of Traditional Chinese Medicine Nanjing210023China Changhai Clinical Research Unit Shanghai Changhai HospitalNaval Medical UniversityShanghai200433China Department of Mechanical Engineering University of ManitobaWinnipegR3T 2N2Canada

Current hemostatic agents or dressings are not efficient under extremely hot and cold environments due to deterioration of active ingredients,water evaporation and ice crystal growth.To address these challenges,we engineered a biocompatible hemostatic system with thermoregulatory properties for harsh conditions by combining the asymmetric wetting nano-silica aerogel coated-gauze(AWNSA@G)with a layer-by-layer(LBL)structure.Our AWNSA@G was a dressing with a tunable wettability prepared by spraying the hydrophobic nano-silica aerogel onto the gauze from different distances.The hemostatic time and blood loss of the AWNSA@G were 5.1 and 6.9 times lower than normal gauze in rat’s injured femoral artery model.Moreover,the modified gauze was torn off after hemostasis without rebleeding,approximately 23.8 times of peak peeling force lower than normal gauze.For the LBL structure,consisting of the nano-silica aerogel layer and a n-octadecane phase change material layer,in both hot(70℃)and cold(-27℃)environments,exhibited dual-functional thermal management and maintained a stable internal temperature.We further verified our composite presented superior blood coagulation effect in extreme environments due to the LBL structure,the pro-coagulant properties of nano-silica aerogel and unidirectional fluid pumping of AWNSA@G.Our work,therefore,shows great hemostasis potential under normal and extreme temperature environments.

关键词： Hydrophobic hemostasis Thermal management Hydrophobic methyl modified nano-silica aerogel harsh environments Unidirectional fluid pumping

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Thin and Flexible Fe–Si–B/Ni–Cu–P Metallic Glass Multilayer Composites for Efficient Electromagnetic Interference Shielding

Thin and Flexible Fe–Si–B/Ni–Cu–P Metallic Glass Multila...

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第十一届中国钢铁年会

作者： Zhang Jijun Li Jiawei Tan Guoguo Hu Renchao Wang Junqiang Chang Chuntao Wang Xinmin Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology & EngineeringChinese Academy of Sciences Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

Thin and flexible materials that can provide efficient electromagnetic interference（EMI） shielding are urgently needed, especially if they can be easily processed and withstand harsh environments.Herein, layer structured Fe–Si–B/Ni–Cu–P metallic glass composites have been developed by simple electroless plating Ni–Cu–P coating on commercial Fe–Si–B metallic glasses.The 0.1-millimeter-thick composite shows EMI shielding effectiveness of 40 dB over the X-band frequency range, which is higher than that of traditional metals, metal oxides and their polymer composites of larger thickness.Most of the applied electromagnetic waves（EMWs） are proved to be absorbed rather than bounced back.This performance originates from the combination of superior permeability, excellent electrical conductivity, and multiple internal reflections from multilayer composites.In addition, the flexible composites also exhibit good corrosion resistance, high thermal stability, and excellent tensile strength, making them suitable for EMI shielding in harsh chemical or thermal environments.

关键词： Fe-based metallic glasses electroless Ni–Cu–P multilayer composites electromagnetic shielding harsh environments

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