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Ralf Riedel
Technische Universität Darmstadt
473Publications
53H-index
11.8kCitations
Publications 473
Newest
Bernd Mainzer2
Estimated H-index: 2
(German Aerospace Center),
Chaorong Lin (Technische Universität Darmstadt)+ 3 AuthorsDietmar Koch16
Estimated H-index: 16
(German Aerospace Center)
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 these high m...
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2018 in Ceramics InternationalIF: 3.06
Xin’gang Luan3
Estimated H-index: 3
(Northwestern Polytechnical University),
Sen Chang1
Estimated H-index: 1
(Northwestern Polytechnical University)
+ 3 AuthorsLaifei Cheng42
Estimated H-index: 42
(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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Daniela Penther1
Estimated H-index: 1
(Technical University of Berlin),
Alireza Ghasemi1
Estimated H-index: 1
(Technical University of Berlin)
+ 2 AuthorsSepideh Kamrani1
Estimated H-index: 1
(Technical University of Berlin)
Abstract The production of fully dense Mg-SiC nanocomposites with a homogeneous distribution of SiC nanoparticles through powder metallurgy techniques is still a challenging issue. We propose to combine sintering and hot extrusion of mechanically milled composite powders to encompass the known difficulties of conventional processing. Here, we report on the effect of SiC nanoparticle content on the compressibility, microstructure and hardness of SiC-Mg nanocomposites during the different consolid...
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Antoine Viard3
Estimated H-index: 3
,
Diane Fonblanc1
Estimated H-index: 1
+ 8 AuthorsRalf Riedel53
Estimated H-index: 53
1 Citations Source Cite
2018 in Ceramics InternationalIF: 3.06
Xin’gang Luan3
Estimated H-index: 3
(Northwestern Polytechnical University),
Sen Chang1
Estimated H-index: 1
(Northwestern Polytechnical University)
+ 1 AuthorsLaifei Cheng42
Estimated H-index: 42
(Northwestern Polytechnical University)
An air stable high temperature adhesive synthesized via the polymer-derived-ceramic route had received increased attention in the last two decades. To improve the thermal stability and adhesion strength of a polysilazane (PSNB) adhesive, TiB2 was added as active filler to join SiC ceramic discs. The thermal stability, phase composition and microstructure were investigated by using TGA, XRD, FT-IR, BSE and SEM measurements. Effects of the pyrolysis temperature and active filler TiB2 on the micros...
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Christina Stabler3
Estimated H-index: 3
(Technische Universität Darmstadt),
Daniel Schliephake12
Estimated H-index: 12
(Applied Materials)
+ 5 AuthorsEmanuel Ionescu20
Estimated H-index: 20
(Technische Universität Darmstadt)
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2018 in Corrosion ScienceIF: 4.86
Qingbo Wen3
Estimated H-index: 3
(Technische Universität Darmstadt),
Ralf Riedel53
Estimated H-index: 53
(Technische Universität Darmstadt),
Emanuel Ionescu20
Estimated H-index: 20
(Technische Universität Darmstadt)
The short-term oxidation (i.e., exposure time of up to 20 h) of dense monolithic (Hf,Ta)C/SiC-based ceramic nanocomposites at temperatures from 1200 to 1500 °C is presented and discussed. The oxidation behavior of HfC/SiC is similar to that of other UHTCs, indicating that it is mainly determined by the HfC phase. Ta incorporation into HfC leads to a strong decrease of the parabolic oxidation rates (3–4 orders of magnitude). Unlike HfC/SiC, Ta-containing nanocomposites form continuous multiphasic...
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Qingbo Wen3
Estimated H-index: 3
(Technische Universität Darmstadt),
Zhaoju Yu14
Estimated H-index: 14
(Xiamen University)
+ 7 AuthorsRalf Riedel53
Estimated H-index: 53
(Technische Universität Darmstadt)
Dense monolithic SiC/HfyTa1−yCxN1−x/C (y = 0, 0.2 and 0.7) ceramic nanocomposites were prepared upon spark plasma sintering of amorphous SiHfTaC(N) ceramic powders which were synthesized from single-source-precursors. The microstructural evolution of the ceramic powders was investigated using elemental analysis, X-ray diffraction, Raman spectroscopy and transmission electron microscopy (TEM). The results reveal that the powdered and dense monoliths of SiC/HfyTa1−yCxN1−x/C ceramic nanocomposites ...
4 Citations Source Cite
2018 in MaterialsIF: 2.47
Felix Rosenburg1
Estimated H-index: 1
,
Emanuel Ionescu20
Estimated H-index: 20
+ 1 AuthorsRalf Riedel53
Estimated H-index: 53
The microstructure of segregated carbon in silicon oxycarbide (SiOC), hot-pressed at T = 1600 °C and p = 50 MPa, has been investigated by VIS Raman spectroscopy (λ = 514 nm) within the temperature range 25–1000 °C in air. The occurrence of the G, D’ and D bands at 1590, 1620 and 1350 cm−1, together with a lateral crystal size La < 10 nm and an average distance between lattice defects LD ≈ 8 nm, provides evidence that carbon exists as nano-crystalline phase in SiOC containing 11 and 17 vol % carb...
4 Citations Source Cite
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