Reactive Element Effect Applied by Alloying and SiHfBCN Coating on the Oxidation of Pure Chromium

Ulrich, Anke Silvia; Kaiser, Timo; Ionescu, Emanuel; Riedel, Ralf; Galetz, Mathias C.

doi:10.1007/s11085-019-09926-w

Cited by 9 publications

(3 citation statements)

References 59 publications

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“…24 The use of PDCs as sintering additives for UHTCs has been anticipated to bring additional advantages for the prepared monoliths, such as improved ultrahigh temperature oxidation and creep resistance. 26,27 Thus, by using PDC-based sintering additives with suitable phase compositions, UHTCs with improved behavior in ultra-harsh environments are expected to be obtained.…”

Section: Methodsmentioning

confidence: 99%

“…It was shown that the use of PDCs allows to obtain dense monolithic UHTCs at relatively moderated temperatures of 1600–1800℃ for a ZrB 2 ‐based UHTC which was sintered via hot‐pressing with SiBCN addition 24 . The use of PDCs as sintering additives for UHTCs has been anticipated to bring additional advantages for the prepared monoliths, such as improved ultrahigh temperature oxidation and creep resistance 26,27 . Thus, by using PDC‐based sintering additives with suitable phase compositions, UHTCs with improved behavior in ultra‐harsh environments are expected to be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…No references were found on modeling of the PIP process for CMCs, though experimental studies on this manufacturing process have been reported. Studies on polycarbosilanederived SiC ceramic 25 and SiC/SiC composite 26,27 have shown that porosity decreases and mechanical properties improve with the increasing number of PIP cycles. Zhu et al 28 show that increasing pyrolysis temperature and the concentration of SiC fillers in polycarbosilane polymer result in improved mechanical properties in two-dimensional Carbon/ SiC (C/SiC) composites fabricated using the PIP process.…”

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confidence: 99%

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Monolithic ZrB₂‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid

et al. 2021

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Ultrahigh temperature ceramics, so-called UHTCs, represent a class of materials that can operate under extreme conditions such as ultra-high temperatures (i.e., beyond 2000℃). [1][2][3] They have been investigated within the context of aerospace, for example, leading edges and control surfaces for atmospheric re-entry, hypersonic flight, and scramjet propulsion or with respect to nuclear power applications such as fuel cladding materials or non-oxidic fuels. 2,[4][5][6] UHTCs are characterized by tremendously high melting points, high hardness, stiffness and strength even at (ultra)high temperatures as well as high thermal conductivity. 7-10 Despite their highly attractive properties, there are still challenges related to the development of UHTCs, for example, concerning their sluggish self-diffusion which impedes their sintering ability, [11][12][13][14][15][16] or their rather fair ultrahigh temperature oxidation/ corrosion resistance. [17][18][19][20][21][22][23] In order to overcome these issues, secondary phases, typically silicon-containing, are considered for the sintering of UHTCs and to additionally provide an improvement of their oxidation behavior. Typically, 10-20 vol.% of silica former phases such as SiC, Si 3 N 4 or metal silicides, for example, MoSi 2 have

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Monolithic ZrB₂‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid

et al. 2021

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Polymer‐Derived Ceramic Coatings with Excellent Thermal Cycling Stability

Bernauer,

Kredel,

Ionescu

et al. 2024

Adv Eng Mater

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In the present work, transition metal‐containing preceramic silicon polymers were synthesized via chemical modification of a commercially available organopolysilazane with Hf and Ta amido complexes as well as with borane dimethyl sulfide complex. The incorporation of transition metals into the polymer structure, their influence on ceramization and processability were thoroughly investigated. Moreover, the prepared preceramics were coated onto silicon wafers via spin coating and converted into crack‐free, amorphous SiHfTa(B)CN based ceramic coatings with excellent adhesion to the substrate. The composition of the ceramic coatings was investigated via XPS and their high‐temperature behavior was studied via oxidation tests performed at 1100 °C. Moreover, a thermal cycling procedure to temperatures above 1250 °C with rapid heating and cooling rates (i.e., in the range of 100‐120 K/s) was applied to the ceramic coating, which showed no damage even after ten thermal cycles, indicating their outstanding performance and their potential for use as environmental barrier coatings at high temperatures.TOC: In the present study, single source precursors were obtained through the modification of a commercially available organopolysilazane with Hf, Ta and B. The preceramic polymers show good processability and yield dense, crack‐free and homogeneous ceramic coatings with excellent thermal cycling stability.This article is protected by copyright. All rights reserved.

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Discontinuities in Oxidation Kinetics: A New Model and its Application to Cr–Si-Base Alloys

2021

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Some alloys such as many Cr-based systems show mass gain discontinuities during thermogravimetric measurements which strongly affect the oxidation kinetics. The behaviour cannot be described by the current models available in the literature. Thus, a novel $$k_\mathrm{para}$$ k para –$$k_\mathrm{lin}$$ k lin -P-model was developed to describe oxidation kinetics during the isothermal exposure of materials which show such behaviour. Beside the parabolic rate constant $$k_\mathrm{para}$$ k para and the linear mass loss constant $$k_\mathrm{lin}$$ k lin , the P-value and $$f_P$$ f P are introduced to take into account spontaneous rapid mass gains due to local oxide scale failure. The parameter P serves as a measure for the mass gain due to discontinuous events and $$f_P$$ f P is the frequency of such events. The both parameters can be related to oxide scale detachment and growth stresses. The application of the model is demonstrated for the oxidation of Cr–Si-based alloys in synthetic air at $$1200^{\circ }\hbox {C}$$ 1200 ∘ C for 100 h. For these alloys, the origin of the mass gain discontinuities is discussed and the meaning of P and $$f_P$$ f P is explained in more detail. Using this newly developed model, an insight into growth and nitridation resistance of oxide scales as well as scale adhesion is gained.

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Reactive Element Effect Applied by Alloying and SiHfBCN Coating on the Oxidation of Pure Chromium

Cited by 9 publications

References 59 publications

Monolithic ZrB₂‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid

Monolithic ZrB₂‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid

Polymer‐Derived Ceramic Coatings with Excellent Thermal Cycling Stability

Discontinuities in Oxidation Kinetics: A New Model and its Application to Cr–Si-Base Alloys

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Reactive Element Effect Applied by Alloying and SiHfBCN Coating on the Oxidation of Pure Chromium

Cited by 9 publications

References 59 publications

Monolithic ZrB2‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid

Monolithic ZrB2‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid

Polymer‐Derived Ceramic Coatings with Excellent Thermal Cycling Stability

Discontinuities in Oxidation Kinetics: A New Model and its Application to Cr–Si-Base Alloys

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Monolithic ZrB₂‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid

Monolithic ZrB₂‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid