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, Mirna Chaker; Proust, Vanessa; Lale, Abhijeet; Miele, Philippe; Malo, Sylvie; Gervais, Christel; Bernard, Samuel

doi:10.1002/chem.201603661

Cited by 40 publications

(38 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests a possible reaction between SiH units and NCHx groups present in the alane. A similar reaction has already been observed between Si-H units of polymethylsilazane and NCH3 groups of tetrakis-(dimethylamino)titanium 55 . These two signals are also observed for the PAAZ sample in agreement with its expected structure.…”

Section: Synthesis Of Polyaluminosilazanessupporting

confidence: 79%

Chemistry of a series of aluminum-modified polysilazanes: Synthesis, pyrolysis behaviour and microstructural evolution

Salameh

Bernard

Gervais

et al. 2019

Journal of the European Ceramic Society

Self Cite

View full text Add to dashboard Cite

A series of polyaluminosilazanes was synthesized by reaction of dimethylethylamine alane complex with polysilazanes. Starting from different dichlorosilanes, polysilazanes were obtained by means of ammonolysis. The latter reacted with the alane complex and led to solid polyaluminosilazanes that can be described as "custom-made" polymers since all the steps were monitored and controlled (from the choice of the molecular precursor to the polymerization and the functionalization with aluminum) in order to study the effect of the introduction of Al on the different reactive sites of the Si-backbone in the polysilazanes. Detailed information on the polymers structures were obtained by FTIR and multinuclear solid state NMR spectroscopies. The transition from the polymeric state to the ceramic inorganic state was investigated by means of solid-state NMR spectroscopy and finally the

show abstract

Section: Synthesis Of Polyaluminosilazanessupporting

confidence: 79%

Chemistry of a series of aluminum-modified polysilazanes: Synthesis, pyrolysis behaviour and microstructural evolution

Salameh

Bernard

Gervais

et al. 2019

Journal of the European Ceramic Society

Self Cite

View full text Add to dashboard Cite

show abstract

“…In our study we first synthesized a single-source precursor (SSP) by the reaction of perhydropolysilazane (PHPS) with tetrakis(dimethylamido)titanium (TDMAT) according to the scheme given in Fig. 2 19,20 . For this reaction, we choose a Si:Ti atomic ratio of 5.…”

Section: Resultsmentioning

confidence: 99%

Discovery of Ternary Silicon Titanium Nitride with Spinel-Type Structure

Bhat

Lale

Bernard

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

Here we report on the discovery of a ternary silicon titanium nitride with the general composition (Si 1−x ,ti x) 3 n 4 with x = 0 < x < 1 and spinel-type crystal structure. The novel nitride is formed from an amorphous silicon titanium nitride (Sitin) precursor under high-pressure/high-temperature conditions in a large volume high-pressure device. Under the conditions of 15-20 GPa and 1800-2000 °C, spineltype γ-Si 3 n 4 and rock salt-type c-TiN are formed. In addition, crystals of the discovered nano-sized ternary phase (Si 1−x ,ti x) 3 n 4 embedded in γ-Si 3 n 4 are identified. The ternary compound is formed due to kinetically-controlled synthesis conditions and is analyzed to exhibit the spinel-type structure with ca. 8 atom% of Ti. The Ti atoms occur in both Ti 3+ and ti 4+ oxidation states and are located on the Si sites. the ternary nano-crystals have to be described as (Si,ti) 3 n 4 with n-vacancies resulting in the general composition (Si 4+ 1−x ti 4+ x-δ ti 3+ δ) 3 n 4-δ .

show abstract

“…This allows generating composites or nanocomposites made of (at least) one more phase in addition to SiC or Si 3 N 4 . Such materials often exhibit dramatically enhanced properties in terms of mechanical properties and/or structure stability . In particular, this involves approaches based on the mixing of polymers with metal fillers …”

Section: The Polymer‐derived Ceramics Routementioning

confidence: 99%

Tape casting of preceramic polymers toward advanced ceramics: A review

Hotza

Nishihora

Machado

et al. 2019

Int J Ceramic Engine & Sci

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Cited by 40 publications

References 63 publications

Chemistry of a series of aluminum-modified polysilazanes: Synthesis, pyrolysis behaviour and microstructural evolution

Chemistry of a series of aluminum-modified polysilazanes: Synthesis, pyrolysis behaviour and microstructural evolution

Discovery of Ternary Silicon Titanium Nitride with Spinel-Type Structure

Tape casting of preceramic polymers toward advanced ceramics: A review

Contact Info

Product

Resources

About