Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics

Zhou, Cong; Gao, Xiang; Xu, Yiling; Buntkowsky, Gerd; Ikuhara, Yuichi; Riedel, Ralf; Ionescu, Emanuel

doi:10.1016/j.jeurceramsoc.2015.01.026

Cited by 31 publications

(41 citation statements)

References 33 publications

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“…Then, precursors are converted in af irst pyrolysis step into single-phase amorphousc eramics. The latter are subsequently heat-treated at ah igher temperature to provide materials with tuned phase composition and nano-or microstructural organization.T hese materials can be prepared in the silicon-based carbide, carbonitride, and nitride systems, [18][19][20][21][22][23][24] and nanocrystals may be also metals or metal silicides, as discussed in reference [24].…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites through the Chemistry of Single‐Source Precursors: Understanding the Role of Chemistry behind the Design of Monolith‐Type Nanostructured Titanium Nitride/Silicon Nitride

Bechelany

Proust

Lale

et al. 2016

Chemistry A European J

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Monolith-type titanium nitride/silicon nitride nanocomposites, denoted as TiN/Si N , have been prepared by a reaction of polysilazanes with a titanium amide precursor, warm pressing of the resultant polytitanosilazanes, and subsequent pyrolysis of the green bodies at 1400 °C. Initially, a series of polytitanosilazanes was synthesized and the role of the chemistry behind their synthesis was studied in detail by using solid-state NMR spectroscopy, elemental analysis, and molecular-weight measurements. The intimate relationship between the chemistry and the processability of these precursors is discussed. Polytitanosilazanes display the appropriate requirements for facile processing in solution and as a melt, but they must be treated with liquid ammonia to be adapted for solid-state processing, that is, warm-pressing, to design dense and mechanically stable structures after pyrolysis. We provide a comprehensive mechanistic study of the nanocomposite conversion based on solid-state NMR spectroscopy coupled with thermogravimetric experiments. HRTEM images coupled with XRD and Raman spectroscopy confirmed the unique nanostructural features of the nanocomposites, which appear to be a result of the molecular origin of the materials. The as-obtained samples are composed of an amorphous Si N matrix, in which TiN nanocrystals are homogeneously formed in situ in the matrix during the process. The hardness and Young moduli were measured and are discussed.

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Section: Introductionmentioning

confidence: 99%

Nanocomposites through the Chemistry of Single‐Source Precursors: Understanding the Role of Chemistry behind the Design of Monolith‐Type Nanostructured Titanium Nitride/Silicon Nitride

Bechelany

Proust

Lale

et al. 2016

Chemistry A European J

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“…Upon the addition of n-BuLi and HfCl 4 , the broad absorption bands related to SieN and BeN can be divided into two sharp ones that infer the several of the activity groups in the side chain. The weak absorption bands at 932 cm À1 and 1251 cm À1 are assigned to HfeN [20], which is reported to be thermodynamically favored [20,25]. Besides, the bands of SieOeSi (1009 cm À1 ) and SieOH (530 cm À1 ) [24,26] appear in the spectrum of PBSZ and PBSZHf, which is due to the hydrolysis of SieNH during testing in air since the sensitivity of polymer to air, which are not found in the ceramics.…”

Section: Synthesis Of Polymermentioning

confidence: 92%

“…Thus, these Hafnium compounds can act as refractoriness in the Si-based ceramics and greatly improve their high temperature stability [10,18,19]. Hafnium nitride (HfN) is a typical hafnium based high-temperature phases for Si-based ceramics, which has high melting points (3310 C), hardness (16 GPa) and chemical inertness [20]. The HfN phases may exhibit better thermal stability with respect to defer the crystallization and carbothermal decomposition at elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

“…However, most synthesis methods require the precursor annealing at high temperature [21]. For example, HfN/SiN x nanocomposites are prepared from suitable single-source precursors at 1600 C in nitrogen [20]. SiBCN/HfN/Si 3 N 4 nanocomposite ceramics are prepared from polysilazane at 1700 C under nitrogen, which are nanostructured ultrahigh-temperature stable materials.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Wang

Zhang

Sun

et al. 2016

Journal of Alloys and Compounds

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“…In the forthcoming years, there has been much activity worldwide in the PDCs field, and the organosilicon precursor chemistry remained the highest active contributor to this topic, as illustrated in a majority of references. 36,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69] Organosilicon precursors, such as halogenosilanes, made an increasingly important contribution to the research development and manufacture of PDCs. For instance, chlorosilanes have been investigated for the synthesis of polysiloxanes by hydrolysis of Si-Cl bonds followed by subsequent condensation of the Si-OH intermediates to form Si-O-Si groups in polysiloxanes ( Figure 2).…”

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confidence: 99%

Tape casting of preceramic polymers toward advanced ceramics: A review

Hotza

Nishihora

Machado

et al. 2019

Int J Ceramic Engine & Sci

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In the last 20 years, tape casting, a standard wet‐shaping process to produce thin ceramics, has been applied to manufacture polymer‐derived ceramics (PDCs). Si‐based polymers, such as polysiloxanes and polysilazanes, also known as preceramic polymers (PCPs), have been used as precursors/binders replacing conventional raw materials and additives for tape casting process. Thermal processing of PCPs is carried out at lower temperatures in comparison with classical ceramic sintering, particularly of carbides and nitrides. Furthermore, polymeric precursors can be converted into hybrid or composite ceramics, when parts of the polymers remain unreacted. Inert or reactive fillers might be used to reduce both shrinkage and porosity inherently caused by the weight loss occurring during polymer pyrolysis while forming new ceramic phases in the final materials. Alternatively, pore formers might also be added to tailor pore shape, connectivity, and volume (macroporosity). Nevertheless, current equipment and process parameters for tape casting‐based products must be eventually adjusted to fit the characteristics of ceramic precursors. Therefore, the aim of this review is focused on listing and discussing the efforts to produce PDCs using tape casting as a shaping technique. Interactions of system components and effects of treatment, particularly thermal stages, on final microstructure and properties are stressed out. Gaps in the literature concerning processing optimization are pointed out, and suggestions are given for further development of PDCs produced by tape casting.

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Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics

Cited by 31 publications

References 33 publications

Nanocomposites through the Chemistry of Single‐Source Precursors: Understanding the Role of Chemistry behind the Design of Monolith‐Type Nanostructured Titanium Nitride/Silicon Nitride

Nanocomposites through the Chemistry of Single‐Source Precursors: Understanding the Role of Chemistry behind the Design of Monolith‐Type Nanostructured Titanium Nitride/Silicon Nitride

Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Tape casting of preceramic polymers toward advanced ceramics: A review

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