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Superior synergistic oxidation resistance of medium-entropy carbide ceramic powders rather than multi-phase carbide ceramic powders

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Journal of Advanced Ceramics 2024年第8期13卷 1223-1233页

作者： Jiachen Li Fanyu Lu Tao Li Yanqin Fu Junhao Zhao junshuai lv Yulei Zhang Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi'an 710072China

To date,some questions about medium-entropy carbide ceramics and the corresponding multi-phase carbide ceramics with the same cations and proportions remain *** oxidation behavior,do both have synergistic oxidation abilities and what role does entropy stabilization play in medium-entropy carbides?In this work,the oxidation behaviors of HfC-ZrC-TiC multi-phase carbide(HZT-MPC)and(Hf_(1/3)Zr_(1/3)Ti_(1/3))C medium-entropy carbide(HZT-MEC)powders were *** thermogravimetry(TG)oxidation,the TG curve of HZT-MPC had a bimodal ***"preferential oxidation"of HfC/ZrC occurred within HZT-MPC,followed by the formation of multi-phase oxides(HfO_(2),ZrO_(2),and TiO_(2)).The uneven compositional distribution slowed their solid solution reactions to form Ti-doped(Hf,Zr)O_(2) and(Hf,Zr)TiO_(4).The TG curve of HZT-MEC had a single peak.A uniform compositional distribution at the atomic scale promoted the rapid interdiffusion of oxides,forming Ti-doped(Hf,Zr)O_(2) and(Hf,Zr)TiO_(4) without ZrO_(2),HfO_(2),and TiO_(2) after TG ***,HZT-MEC had a higher onset oxidation temperature(To;470℃)than did HZT-MPC(430℃),and the TG single peak of HZT-MEC was between the TG bimodal peaks of ***,HZT-MEC showed superior oxidation resistance compared to HZT-MPC,which was attributed to the entropy stabilization effect of HZT-MEC suppressing the"preferential oxidation"of HfC/ZrC and the"delayed oxidation"of TiC,promoting the synergistic oxidation ability of multiple principal elements.

关键词： medium-entropy carbide multi-phase carbide synergistic oxidation ability oxidation resistance

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Theoretical design and experimental verification of high-entropy carbide ablative resistant coating

Advanced Powder Materials

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Advanced Powder Materials 2024年第5期3卷 11-22页

作者： Lingxiang Guo Shiwei Huang Wei Li junshuai lv Jia Sun Science and Technology on Thermostructural Composite Materials Laboratory Shaanxi Key Laboratory of Fiber Reinforced Light Composite MaterialsNorthwestern Polytechnical UniversityXi'an710072China

Composition design of high-entropy carbides is a topic of great scientific interest for the hot-end parts in the aerospace field.A novel theoretical method through an inverse composition design route,*** ensuring the oxide scale with excellent anti-ablation stability,is proposed to improve the ablation resistance of the highentropy carbide *** this work,the(Hf_(0.36)Zr_(0.24)Ti_(0.1)Sc_(0.1)Y_(0.1)La_(0.1))C1-δ(HEC)coatings were prepared by the inverse design concept and verified by the ablation resistance *** linear ablation rate of the HEC coatings is1.45μm/s,only 4.78%of the pristine HfC coatings after the oxyacetylene ablation at 4.18 MW/*** HEC possesses higher toughness with a higher Pugh's ratio of 1.55 in comparison with HfC(1.30).The in-situ formed dense(Hf_(0.36)Zr_(0.24)Ti_(0.1)Sc_(0.1)Y_(0.1)La_(0.1))O2-δoxide scale during ablation benefits to improve the anti-ablation performance attributed to its high structural adaptability with a lattice constant change not exceeding 0.19%at 2000-2300℃.The current investigation demonstrates the effectiveness of the inverse theoretical design,providing a novel optimization approach for ablation protection of high-entropy carbide coatings.

关键词： High-entropy ceramic Theoretical design Thermal spray coating Ablation resistance First-principles calculation

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Influence of MoSi_(2) on oxidation protective ability of TaB_(2)-SiC coating in oxygen-containing environments within a broad temperature range

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Journal of Advanced Ceramics 2020年第6期9卷 703-715页

作者： Xuanru REN junshuai lv Wei LI Yuwen HU Ke SUN Can MA Hong’ao CHU Weiguang WANG Leihua XU Ziyu LI Peizhong FENG School of Materials Science and Engineering China University of Mining and TechnologyXuzhou 221116China

TaB_(2)-SiC coating modified by different content of MoSi_(2) was fabricated on graphite substrate with SiC inner coating by liquid phase sintering to elevate the anti-oxidation capability of the TaB_(2)-SiC *** compared to the sample with the TaB_(2)-40wt% SiC coating,the coating sample modified with MoSi_(2) exhibited a weight gain trend at lower temperatures,the fastest weight loss rate went down by 76%,and the relative oxygen permeability value reduced from about 1% to near *** importantly,the large amount of SiO_(2) glass phase produced over the coating during oxidation was in contact with the modification of MoSi_(2),which was proved to be beneficial to the dispersion of Ta-oxides.A concomitantly formed continuous Ta-Si-O-B compound glass layer showed excellent capacity to prevent oxygen ***,when the TaB_(2) content was sacrificed to increase the MoSi_(2) content,the relative oxygen permeability of the coating increased instead of ***,on the basis of ample TaB_(2) content,increasing the MoSi_(2) content of the coating is conducive to reducing the relative oxygen permeability of the coatings in a broad temperature region.

关键词： MoSi_(2) TaB_(2)-SiC coating liquid phase sintering compound glass layer relative oxygen permeability

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长链非编码RNA CASC2调节HepG2肝癌细胞的炎症因子分泌并诱导细胞凋亡和生长阻滞

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免疫学杂志 2021年第11期37卷 947-953页

作者：郝剑苏华贺杰马俊帅韩磊河北北方学院附属第一医院输血科 075061 河北北方学院附属第一医院检验科 075061 河北北方学院附属第一医院普外科 075061

目的研究长链非编码RNA癌症易感候选物2(CASC2)对肝癌细胞肿瘤免疫微环境的调节和对细胞增殖、凋亡的影响。方法 RT-qPCR检测肝癌组织和细胞中LncRNA CASC2的表达。运用Lipofectamine 2000将lv-scramble和lv-CASC2质粒分别转染到肝癌He... 详细信息

目的研究长链非编码RNA癌症易感候选物2(CASC2)对肝癌细胞肿瘤免疫微环境的调节和对细胞增殖、凋亡的影响。方法 RT-qPCR检测肝癌组织和细胞中LncRNA CASC2的表达。运用Lipofectamine 2000将lv-scramble和lv-CASC2质粒分别转染到肝癌HepG2细胞。ELISA检测细胞上清液中IL-6、IL-10、IL-4和IL-1β的含量,评估肝癌细胞肿瘤免疫微环境;克隆形成实验检测细胞增殖;流式细胞术检测细胞凋亡;Western blot检测细胞裂解液中p65的磷酸化和增殖相关蛋白p21,Ki67和Survivin的表达。结果 LncRNA CASC2在肝癌组织中下调(Plv-CASC2转染组HepG2细胞中IL-6和IL-1β水平显著升高,IL-10和IL-4水平显著降低,克隆形成能力降低,细胞凋亡率升高(P<0.05)。结论 LncRNA CASC2可通过改变HepG2细胞炎症因子的分泌、阻止细胞增殖和诱导细胞凋亡来实现肝癌肿瘤的生长阻滞。

关键词： LncRNA CASC2 HepG2细胞肝癌 p21 炎性微环境

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