Reactive melt infiltration of carbon fibre reinforced ZrB2/B composites with Zr2Cu

Vinci, Angela Di; Zoli, Luca; Galizia, Pietro; Kütemeyer, Marius; Koch, Dietmar; Frieß, Martin; Sciti, Diletta

doi:10.1016/j.compositesa.2020.105973

Cited by 28 publications

(8 citation statements)

References 25 publications

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“…Due to the similar contrast displayed by the constituent phases, a precise quantification of ZrB2, residual Zr and ZrC was not possible. The final fibre content amounted to ~25%, which was attributed to the swelling of the material during infiltration as previously observed by Vinci et al [25]. For specimen RMI-2, the Zr2Cu reacted with B4C, resulting in the formation of ZrB2/ZrC phases, whilst the majority of residual copper segregated to the surface of the sample.…”

Section: Microstructure Of As-produced Compositessupporting

confidence: 77%

“…Both specimens were characterized by little or no fibre pull-out. As in the previous work [25], the shrinkage of the metallic phase during cooling led to the fibre/matrix debonding, i.e. a weak interface was formed.…”

Section: Microstructure Of As-produced Compositessupporting

confidence: 59%

“…RMI-1 and 2: Both samples were manufactured using UF-XN80-300 unidirectional laminates with uncoated fibres. The initial fibre volume content was 38 vol.% but decreased to around 30 vol.% due to increasing thickness during infiltration [25]. The laminates were impregnated with a phenolic-based slurry containing a powder mixture of elemental B and ZrB2 before stacking in a 0/90° configuration and curing at 423 K. After pyrolysis, the porous matrix contained B, C and ZrB2 phases.…”

Section: Methodsmentioning

confidence: 99%

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Retained strength of UHTCMCs after oxidation at 2278 K

Galizia

Vinci

Zoli

et al. 2021

Composites Part A: Applied Science and Manufacturing

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In the frame of Horizon 2020 European C 3 HARME research project, the manufacture of ZrB2-based CMCs was developed through different processes: slurry infiltration and sintering, radio frequency chemical vapour infiltration (RF-CVI) and reactive metal infiltration (RMI). To assess the high temperature stability, room temperature bending strength was measured after oxidizing the samples at 2278 K and compared to the strength of the as-produced materials. Microstructures were analysed before and after the thermal treatment to assess the damage induced by the high temperature oxidation. Short fibre-reinforced composites showed the highest retained strength (>80 %) and an unchanged stress-strain curve.

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Section: Microstructure Of As-produced Compositessupporting

confidence: 77%

Section: Microstructure Of As-produced Compositessupporting

confidence: 59%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Retained strength of UHTCMCs after oxidation at 2278 K

Galizia

Vinci

Zoli

et al. 2021

Composites Part A: Applied Science and Manufacturing

Self Cite

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“…It is revealed that chemical reaction and physical melting are the main interphase degradation mechanisms involved during RMI. Besides, residual metallic phase results in the decrease of mechanical and anti-ablation properties when the composites are operated at high temperatures [244].…”

Section: Processing and Microstructures Of Uhtcmcsmentioning

confidence: 99%

Advances in ultra-high temperature ceramics, composites, and coatings

et al. 2021

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Ultra-high temperature ceramics (UHTCs) are generally referred to the carbides, nitrides, and borides of the transition metals, with the Group IVB compounds (Zr & Hf) and TaC as the main focus. The UHTCs are endowed with ultra-high melting points, excellent mechanical properties, and ablation resistance at elevated temperatures. These unique combinations of properties make them promising materials for extremely environmental structural applications in rocket and hypersonic vehicles, particularly nozzles, leading edges, and engine components, etc. In addition to bulk UHTCs, UHTC coatings and fiber reinforced UHTC composites are extensively developed and applied to avoid the intrinsic brittleness and poor thermal shock resistance of bulk ceramics. Recently, highentropy UHTCs are developed rapidly and attract a lot of attention as an emerging direction for ultra-high temperature materials. This review presents the state of the art of processing approaches, microstructure design and properties of UHTCs from bulk materials to composites and coatings, as well as the future directions.

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“…However, the further process could be possible for analyses of an element with un-flat section, polish. Currently, un-flat samples are polished using a semi-automatic polishing machine with diamond abrasives to produce a flat section with a 0.25 μm that washed with ethanol for 5 min up to three times and dried for an hour at 80 °C in an oven (7). This polished process sometimes causes surface damage to samples, therefore study the suitable and concentration of a material polishing powder is important (8) that consumes time and cost.…”

Section: Introductionmentioning

confidence: 99%

Novel use of XRF in the adsorption processes for the direct analysis of cadmium and silver in absorbent Na-alginate beads

Jebril

2020

Baghdad Sci.J

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The Na-alginate bead is commonly used in biotechnology fields such as adsorption due to ion exchange between Ca and Na with elements. Scanning electron microscopy (SEM-EDX) has proven to be a comparative method in the detections of these adsorbed elements, but the un-flat forming area of beads that can introduce impossible of the detection of element adsorbed. In contrast, X-ray fluorescence (XRF) documents analysis of elements, direct examination, which may analysis the adsorbents of elements. Here, this Study evaluated the possibility by using XRF for the direct analysis for examples of Cd and Ag in a bench stand. This Study compared this to commonly used SEM-EDX and inductively coupled plasma mass spectrometry (ICP-MS) approaches for Cd and Ag analyses. Overall, novel use of XRF provided precise analyses of the concentrations of Cd and Ag adsorbed within Na-alginate bead and revealed analyses not determined the concentrations in standard SEM-EDX or previously established in other studies of Na-alginate beads. In addition, this Study shows that XRF may be employed in different fields in biotechnology to analysis the concentrations regarding the elemental adsorption of Na-alginate beads and demonstrate the potential for XRF to monitor the procedures underpinning biotechnology sectors.

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Reactive melt infiltration of carbon fibre reinforced ZrB2/B composites with Zr2Cu

Cited by 28 publications

References 25 publications

Retained strength of UHTCMCs after oxidation at 2278 K

Retained strength of UHTCMCs after oxidation at 2278 K

Advances in ultra-high temperature ceramics, composites, and coatings

Novel use of XRF in the adsorption processes for the direct analysis of cadmium and silver in absorbent Na-alginate beads

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