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Ralf Riedel
Northwestern Polytechnical University
529Publications
53H-index
12.4kCitations
Publications 529
Newest
Published on Feb 1, 2019in Journal of The European Ceramic Society 3.79
Bernd Mainzer2
Estimated H-index: 2
(German Aerospace Center),
Chaorong Lin (Technische Universität Darmstadt)+ 3 AuthorsDietmar Koch17
Estimated H-index: 17
(German Aerospace Center)
Abstract Four unidirectional fiber reinforced SiCN ceramic matrix composites were manufactured by means of polymer infiltration and pyrolysis. Two carbon fibers (T800H and Granoc XN90) as well as two silicon carbide fibers (Tyranno ZMI and SA3) without fiber coating were chosen. As matrix precursor, a poly(methylvinyl)silazane was investigated and utilized. The composites with the SA3 and the XN90 fiber had the highest tensile strengths of 478 and 288 MPa, respectively. It is considered that the...
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Published on May 1, 2019in Ceramics International 3.06
Xin’gang Luan3
Estimated H-index: 3
(Northwestern Polytechnical University),
Sen Chang1
Estimated H-index: 1
(Northwestern Polytechnical University)
+ 3 AuthorsLaifei Cheng45
Estimated H-index: 45
(Northwestern Polytechnical University)
Abstract In the present work, SiBCNO-based ceramic as high temperature adhesives are fabricated by polymer derived ceramic route. The effect of polysiloxane (PSO) and TiB 2 on the microstructure and high temperature strength is studied, and the toughing effect of TiB 2 is discussed. The highest adhesion strength of the joint (S12) reached up to 18.95 MPa at room temperature and 12.3 MPa at 1000 °C in vacuum after pyrolysis at 1000 °C in air for 2 h. It is interesting to find that the crystalliza...
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Published on May 1, 2019in Advanced Engineering Materials 2.58
Qingbo Wen3
Estimated H-index: 3
,
Ralf Riedel53
Estimated H-index: 53
,
Emanuel Ionescu21
Estimated H-index: 21
In the present study, two concepts to improve the oxidation resistance at high‐temperatures of ceramic nanocomposites consisting of 85–90 vol% SiC, 5–8 vol% group IV metal carbides (i.e., HfC, TaC), and 5–7 vol% carbon are introduced and discussed. First improvement concept relates to the passivation of the samples upon short‐term oxidation at 1400 °C (30 min). This is a critical step, especially with respect to silica formation, which is relatively sluggish at temperatures lower than 1000–1200 ...
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Published on Jun 1, 2019in Journal of The European Ceramic Society 3.79
Qingbo Wen3
Estimated H-index: 3
(Technische Universität Darmstadt),
Xingang Luan11
Estimated H-index: 11
(Northwestern Polytechnical University)
+ 3 AuthorsRalf Riedel53
Estimated H-index: 53
(Technische Universität Darmstadt)
Abstract Laser ablation test of SiHfC-based ceramic nanocomposites as well as ceramic matrix composites (CMCs) was conducted by exposure to a CO 2 laser beam in air. Laser ablation behavior and possible degradation mechanisms of dense monolithic HfC/SiC ceramic nanocomposites as well as of C f /SiHfC CMCs were investigated. Dense SiC monoliths and C f /SiC CMCs were exposed to same laser ablation conditions and considered as reference materials. The evolution of microstructure and chemical/phase...
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Published on Jul 1, 2019in Journal of The European Ceramic Society 3.79
Christina Stabler4
Estimated H-index: 4
(Technische Universität Darmstadt),
Fabrice Célarié5
Estimated H-index: 5
(University of Rennes)
+ 4 AuthorsEmanuel Ionescu21
Estimated H-index: 21
(Technische Universität Darmstadt)
Abstract Silicon oxycarbides with varying compositions were investigated concerning their elastic and plastic properties. Additionally, the impact of thermal annealing on their elastic properties was assessed. Phase separation of SiOC seems to have no significant impact on Young’s modulus (high values of β-SiC compensate the low values of the vitreous silica matrix) and hardness. However, it leads to an increase in Poisson’s ratio, indicating an increase in the atomic packing density. The phase ...
1 Citations Source Cite
Published on Aug 1, 2019in Renewable Energy 4.90
Mirabbos Hojamberdiev11
Estimated H-index: 11
(Nagoya University),
Mohammad Mansoob Khan35
Estimated H-index: 35
(Universiti Brunei Darussalam)
+ 5 AuthorsMasashi Hasegawa23
Estimated H-index: 23
(Nagoya University)
Abstract Here, we develop a strategy to improve the visible-light-driven photocatalytic hydrogen evolution activity of g-C 3 N 4 by compositing it with low-cost Ni(OH) 2 nanoplatelets and inexpensive and earth-abundant halloysite nanotubes. The Ni(OH) 2 @g-C 3 N 4 /halloysite nanocomposite photocatalysts with different amounts of Ni(OH) 2 (0.5–10 wt%) were prepared, and a synergistic effect of Ni(OH) 2 platelets and halloysite nanotubes on physicochemical properties and photocatalytic hydrogen e...
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Published on May 1, 2019in Advanced Engineering Materials 2.58
Xingang Luan11
Estimated H-index: 11
,
Qiqi Zhang + 5 AuthorsRalf Riedel53
Estimated H-index: 53
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Published on Mar 1, 2019in Journal of Advanced Ceramics 1.60
Zhaoju Yu14
Estimated H-index: 14
(Xiamen University),
Xuan Lv (Xiamen University)+ 4 AuthorsRalf Riedel53
Estimated H-index: 53
(Northwestern Polytechnical University)
For the first time, ZrC–ZrB2–SiC ceramic nanocomposites were successfully prepared by a single-source-precursor route, with allylhydridopolycarbosilane (AHPCS), triethylamine borane (TEAB), and bis(cyclopentadienyl) zirconium dichloride (Cp2ZrCl2) as starting materials. The polymer-to-ceramic transformation and thermal behavior of obtained single-source precursor were characterized by means of Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). The results sho...
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Published on Aug 1, 2019in Journal of The European Ceramic Society 3.79
Xin’gang Luan3
Estimated H-index: 3
(Northwestern Polytechnical University),
Lei Wang3
Estimated H-index: 3
(Northwestern Polytechnical University)
+ 3 AuthorsLaifei Cheng45
Estimated H-index: 45
(Northwestern Polytechnical University)
Abstract In order to improve the anti-oxidation performance of C/SiC composites at high temperature, C/SiC composites should be modified by self-healing components. SiBCN ceramic is an ideal self-healing component because of excellent oxidation resistance and thermal stability. C/SiC composites were modified by PDC SiBCN ceramic (C/SiC-SiBCN) by using CVI combined with polymer infiltration and on-line pyrolysis (PI-OP). The oxidation behaviors of C/SiC composites fabricated by CVI method and C/S...
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Published on May 6, 2019in Journal of the American Ceramic Society 2.96
Xingang Luan11
Estimated H-index: 11
(Northwestern Polytechnical University),
Xinming Xu (Northwestern Polytechnical University)+ 3 AuthorsRalf Riedel53
Estimated H-index: 53
(Northwestern Polytechnical University)
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