Polysilazane derived micro/nano Si3N4/SiC composites

Zemanová, M.; Lecomte, Emmanuel; Šajgalı́k, Pavol; Riedel, Ralf

doi:10.1016/s0955-2219(02)00039-0

Cited by 28 publications

(18 citation statements)

References 8 publications

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“…In the present study the prevalence of the enhanced oxygen composition in hybrids prepared under ambient atmosphere may be attributed to the employed (thin) film geometry. This is in agreement with those literature reports that do mention the reactivity with water, [13,33] all of which focus on the synthesis of small-scale structures, i.e., structures with large surfaceto-volume ratios.…”

Section: Nucleussupporting

confidence: 92%

Composition and Morphology Control in Ordered Mesostructured High‐Temperature Ceramics from Block Copolymer Mesophases

Kamperman

Scarlat

et al. 2007

Macro Chemistry & Physics

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The co‐assembly between a polyisoprene‐block‐poly(dimethylaminoethyl methacrylate) block copolymer and poly(ureamethylvinyl)silazane is investigated. The hybrid morphology can be controlled by systematically increasing the inorganic‐to‐organic ratio or by changing the molecular weight of the block copolymer. Temperature treatment up to 1 500 °C of the hybrids resulted in mesoporous, ordered non‐oxide‐type ceramics. The results suggest that careful control of co‐assembly processes enables access to nanostructured high‐temperature ceramics that may have novel mechanical, thermal, and chemical properties.magnified image

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Section: Nucleussupporting

confidence: 92%

Composition and Morphology Control in Ordered Mesostructured High‐Temperature Ceramics from Block Copolymer Mesophases

Kamperman

Scarlat

et al. 2007

Macro Chemistry & Physics

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“…[25] However, it is much less severe than in the case of a sol-gel process, thus, preceramic polymers have been widely fabricated via thermal curing and pyrolysis steps for a variety of high-temperature material applications, such as fibers and composites. [16,26] The observed anisotropic shrinkage behavior is a severe detrimental factor for the precise fabrication of 3D ceramic microstructures. In an attempt to rectify this shrinkage problem, silica particles with approximately 10 nm diameter were introduced as a filler into the inorganic photoresist resin with various solid loading portions.…”

Section: Shrinkage Control Of 3d Ceramic Microstructures With Silica mentioning

confidence: 99%

Three‐Dimensional SiCN Ceramic Microstructures via Nano‐Stereolithography of Inorganic Polymer Photoresists

Pham

Kim

Lim

et al. 2006

Adv Funct Materials

191

108

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We report a newly synthesized inorganic polymer photoresist with a high ceramic yield by the functionalization of polyvinylsilazane (KiON VL20) with 2‐isocyanatoethyl methacrylate via linkage or insertion reaction routes. The chemistry of the synthesis and the pyrolytic conversion as well as the mechanical evaluation were investigated by using various analytical instruments. We show for the first time that this photosensitive resin is a novel precursor for the fabrication of complex 3D SiCN ceramic microstructures with a 210 nm resolution via a two‐photon absorbed crosslinking process and subsequent pyrolysis at 600 °C under a nitrogen atmosphere. Moreover, the dimensional deformation during pyrolysis was significantly reduced by adding silica nanoparticles as a filler. In particular, the ceramic microstructures containing 40 wt % silica nanoparticles exhibited a relatively isotropic shrinkage owing to its sliding free from the substrate during pyrolysis.

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“…Furthermore, the typical hot pressing temperature of >1800 °C for Si 3 N 4 /SiC composites can be used to achieve the density of >3.00 g/cm 3 with the addition of 8-15 wt. % sintering additives [13,[30][31][32], which was higher compared to this study.…”

Section: Figure 3 Densities Of the Sintered Sic-based Ceramic Composmentioning

confidence: 57%

“…According to manufacturer [10], polysilazane can be derived to Sibased ceramics such as SiC, SiC/Si 3 N 4 or Si x N y O z depend on the atmosphere of the pyrolysis. Nowadays, we can find a published report about fabrication of Si 3 N 4 [11] or Si 3 N 4 /SiC [4,[11][12][13][14][15] from polysilazane. However, to obtain fully dense ceramic composites from polysilazane, the sintering additives are still required [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%