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Effects of High Temperature Oxidation on Mechanical Properties of Ti_3AlC_2

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Journal of materials science & Technology 2017年第6期33卷 596-602页

作者： Xichao Li Lili Zheng yuhai qian Jingjun Xu Meishuan Li shenyang national {2. for materials science Institute of Metal Research Chinese Academy of Sciences University of chinese academy of sciences

The oxidation tests of Ti_3AlC_2.were conducted at 1100 and 12.0？C in air for 48 and 360 h, respectively,and the effects of high temperature oxidation on the flexural strength and hardness of Ti_3AlC_2.were investigated. The microstructure, grain size and phase compositions of Ti_3AlC_2.substrate didn＇t change after oxidation, hence the oxide removed Ti_3AlC_2.substrate maintained its initial flexural strength and hardness. However, the flexural strength of oxide retained Ti_3AlC_2.decreased by about 5%. Acoustic emission monitoring indicated that during the process of three-point bending test, the formed Al_2._3 scale on Ti_3AlC_2.surface fractured firstly in a cleavage manner, then the substrate/oxide interface cracked,and finally the Ti_3AlC_2.substrate fractured. The mechanical degradation was caused by the preferential formation of cracks in brittle Al_2._3 scale as well as at defective and lacunose grain boundaries of the substrate where stress concentration generated. The mechanical degradation was insensitive to oxidation temperature and time in the present conditions. In addition, the surface hardness increased significantly after oxidation due to the formed hard Al_2._3 scale on the surface of Ti_3AlC_2.substrate.

关键词： Ti3AlC2.Oxidation Flexural strength Hardness Bending test Acoustic emission

Deposition of Phase-pure Cr2.lC Coating by DC Magnetron Sputtering and Post Annealing Using Cr-Al-C Targets with Controlled Elemental Composition but Different Phase Compositions

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Journal of materials science & Technology 2018年第3期34卷 466-471页

作者： Yueming Li Guorui Zhao yuhai qian Jingjun xu Meishuan Li shenyang national {2. for materials science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China University of chinese academy of sciences Beijing 100039China

Polycrystalline Cr2.lC coatings were prepared on M38G superalloy using a two-step method consisting of magnetron sputtering from Cr-Al-C composite targets at room temperature and subsequent annealing at 62. ℃. Particularly, various targets synthesized by hot pressing mixture of Cr, Al, and C powders at 650-1000 ℃ were used. It was found that regardless of the phase compositions and density of the com- posite targets, when the molar ratio of Cr：Al：C in the starting materials was 2.1：1, phase-pure crystalline Cr2.lC coatings were prepared by magnetron sputtering and post crystallization. The Cr2.IC coatings were dense and crack-free and had a duplex structure. The adhesion strength of the coating deposited on M38G superalloy from the 800 ℃ hot-pressed target and then annealed at 62. ℃ for 2. h in Ar exceeded 82.± 6 MPa, while its hardness was 12.± 3 GPa.

关键词： Cr2.lC Coating Magnetron sputtering Composite target Heat treatment

Suppressing the anomalous rapid oxidation of Ti_3AlC_2.by incorporating TiB_2

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Journal of materials science & Technology 2019年第3期35卷 432-439页

作者： Chao Li yuhai qian Chunlei Ma Shumin Wang Meishuan Li Light Industry College of Liaoning University shenyang national {2. for materials science Institute of Metal Research Chinese Academy of Sciences

The oxidation behavior of Ti_3AlC_2.2. TiB_2.composite was studied at 500℃–900℃ in air. The composite showed a very low oxidation rate and followed a logarithmic oxidation law. The in-situ incorporation of TiB_2.suppressed the anomalous rapid oxidation of the substrate Ti_3AlC_2.occurred near 600℃ by forming a protective B_2._3 glass layer, and also improved the oxidation resistance of the MAX phase at intermediatetemperature.

关键词： MAX phase Ti3AlC2.TiB2 composite Oxidation

Chemical Bath Co-deposited ZnS Film Prepared from Different Zinc Salts: ZnSO_4—Zn(CH_3COO)_2. Zn(NO_3)_2.Zn(CH_3COO)_2.or ZnSO_4—Zn(NO_3)_2

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Journal of materials science & Technology 2016年第3期32卷 207-217页

作者： Tingzhi Liu Yangyang Li Huan Ke yuhai qian Shuwang Duo Yanli Hong Xinyuan Sun Jiangxi Key laboratory of Surface Engineering Jiangxi Science and Technology Normal University shenyang national {2. for materials science Institute of Metal Research Chinese Academy of Sciences

ZnSO4-Zn（CH3COO）2. Zn（NO3）2.Zn（CH3COO）2. ZnSO4-Zn（NO3）2. ZnSO4, Zn（NO3）2.or Zn（CH3COO）2.have been used as zinc sources to prepare ZnS thin films by chemical bath deposition and co-deposition methods. Zn（NO3）2.or/and Zn（CH3COO）2.is/are favorable for cluster by cluster deposition process while ZnSO4 favors ion by ion deposition process regardless of concentration ratios of ZnSO4. However, Zn（NO3）2.affects the nucleation density of ZnS nuclei on the substrate. ZnS thin films deposited from ZnSO4-Zn（CH3COO）2.are not only more homogeneous and compact, but also have higher growth rate and adhesion on to the glass substrate. The cubic ZnS films are obtained after only single deposition. The average transmission of films from S6, S7, S8, S9 and S1 for 2.and 2.5 h is greater than 85% in visible region. Compared with the film from S6 （112.nm）, the film from S7 is not only thicker （12. nm）, but also more transparent. The band gaps of the films deposited from S6,S7, S8, S9 and S1 for 2.and 2.5 h range from 3.88 to 3.98 eV. The effects of anions from different zinc salts are discussed in detail.

关键词： Thin film Chemical synthesis Electron microscopy Mechanical properties Optical properties

Microstructure and mechanical properties of short-carbon-fiber/Ti_(3)SiC_(2. composites

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Journal of Advanced Ceramics 2020年第6期9卷 716-725页

作者： Guangqi HE Rongxiu GUO Meishuan LI Yang YANG Linshan WANG yuhai qian Jun ZUO Jingjun XU Changsheng LIU School of materials science and Engineering Northeastern UniversityShenyang 110819China shenyang national {2. for materials science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials science and Engineering University of Science and Technology of ChinaShenyang 110016China College of science Northeastern UniversityShenyang 110819China

Short-carbon-fibers(C_(sf))reinforced Ti_(3)SiC_(2. matrix composites(C_(sf)/Ti_(3)SiC_(2.,the C_(sf) content was 0 vol%,2.vol%,5 vol%,and 10 vol%)were fabricated by spark plasma sintering(SPS)using Ti_(3)SiC_(2. powders and C_(sf) as starting materials at 1300℃.The effects of C_(sf) addition on the phase compositions,microstructures,and mechanical properties(including hardness,flexural strength(σ_(f)),and KIC)of C_(sf)/Ti_(3)SiC_(2. composites were *** C_(sf),with bi-layered transition layers,i.e.,T_(IC) and SiC layers,were homogeneously distributed in the as-prepared C_(sf)/Ti_(3)SiC_(2. *** the increase of C_(sf) content,the K_(IC) of C_(sf)/Ti_(3)SiC_(2. composites increased,but the σ_(f) decreased,and the Vickers hardness decreased initially and then increased steadily when the C_(sf) content was higher than 2.vol%.These changed performances(hardness,σ_(f),and K_(IC))could be attributed to the introduction of C_(sf) and the formation of stronger interfacial phases.

关键词： Ti_(3)SiC_(2. short-carbon-fibers(C_(sf)) spark plasma sintering(SPS) microstructure mechanical properties

热震对包覆ZrB_(2.-SiC-La_(2.O_(3)/SiC涂层渗硅石墨力学性能的影响

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中国腐蚀与防护学报 2021年第1期41卷 29-35页

作者：任岩钱余海张鑫涛徐敬军左君李美栓中国科学院金属研究所沈阳材料科学国家研究中心沈阳110016 中国科学技术大学材料科学与工程学院沈阳110016

采用涂刷法和包埋法在渗硅石墨基体表面制备了双层结构的ZrB_(2.-SiC-La_(2.O_(3)/SiC防护涂层,与表面无包覆涂层的渗硅石墨作对比,采用三点弯曲实验方法研究了热震对其力学性能的影响。结果表明,1500℃到室温之间循环热震10次后,表面... 详细信息

采用涂刷法和包埋法在渗硅石墨基体表面制备了双层结构的ZrB_(2.-SiC-La_(2.O_(3)/SiC防护涂层,与表面无包覆涂层的渗硅石墨作对比,采用三点弯曲实验方法研究了热震对其力学性能的影响。结果表明,1500℃到室温之间循环热震10次后,表面无包覆涂层的样品单位面积氧化失重为52.1 mg/cm^(2.,弯曲强度保持率仅为52.0%;而包覆涂层样品单位面积氧化增重为5.6 mg/cm^(2.,弯曲强度保持率达78.5%,包覆ZrB2.SiC-La2.3/SiC涂层的样品热震后能保持良好的力学性能。在热震过程中ZrB_(2.-SiC-La_(2.O_(3)/SiC涂层氧化生成的氧化层可有效地保护石墨基体不被氧化,避免了样品内部各种缺陷的产生,从而提高了其弯曲强度。

关键词：石墨超高温陶瓷涂层热震弯曲强度

低地轨道空间中原子氧对聚酰亚胺的侵蚀及其防护措施

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腐蚀与防护 2021年第11期42卷 12-19页

作者：崔智瑶王林山钱余海左君徐敬军李美栓东北大学理学院沈阳110013 山东铝谷产业技术研究院有限公司郞平256200 中国科学院金属研究所沈阳材料科学国家研究中心沈阳110016

空间飞行器是人类探索、开发和利用外太空的载体,飞行器材料由于在低地球轨道空间中受到各种侵蚀作用而性能退化,其中高能量的原子氧(AO)是导致空间飞行器材料产生失效的最主要的环境因素。综述了空间原子氧对典型空间材料的侵蚀行为以... 详细信息

空间飞行器是人类探索、开发和利用外太空的载体,飞行器材料由于在低地球轨道空间中受到各种侵蚀作用而性能退化,其中高能量的原子氧(AO)是导致空间飞行器材料产生失效的最主要的环境因素。综述了空间原子氧对典型空间材料的侵蚀行为以及各类抗原子氧侵蚀的防护涂层技术,重点介绍了新型石墨烯二维材料及其复合改性涂层对原子氧侵蚀的防护性能,以期为抗原子氧侵蚀防护涂层的开发提供技术参考。

关键词：低地球轨道原子氧石墨烯防护涂层