C/SiC Ceramic Matrix Composites with Extraordinary Thermomechanical Properties up to 2000 °C.

The thermomechanical properties of carbon fiber reinforced silicon carbide ceramic matrix composites (C/SiC CMCs) were studied up to 2000 °C using high-temperature in situ flexural testing in argon. The CMC specimens were fabricated using an ultrahigh concentration (66 vol%) aqueous slurry containing nano-sized silicon carbide powder. The SiC powder compacts were obtained by drying the slurry and were densified using the precursor impregnation and pyrolysis (PIP) method with field assisted sintering technology/spark plasma sintering (FAST/SPS).

Synthesis of Yttria-Stabilized Zirconia Nanospheres from Zirconium-Based Metal-Organic Frameworks and the Dielectric Properties.

Yttria-stabilized zirconia (YSZ) nanospheres were synthesized by calcination at 900 °C after the adsorption of Y ions into the pores of a zirconium-based metal-organic framework (MOF). The synthesized 3YSZ (zirconia doped with 3 mol% YO), 8YSZ (8 mol% YO), and 30YSZ (30 mol% YO) nanospheres were found to exhibit uniform sizes and shapes. Complex permittivity and complex permeability were carried out in K-band (i.

Microstructural and nanoindentation study of TaN incorporated ZrB and ZrB-SiC ceramics.

This study assessed the sinterability and microstructure of ZrB-SiC-TaN and ZrB-TaN ceramics. Spark plasma sintering at 2000 °C and 30 MPa for 5 min produced both ceramics. The relative density of ZrB ceramic containing TaN was 95.

Manufacturing ZrB-SiC-TaC Composite: Potential Application for Aircraft Wing Assessed by Frequency Analysis through Finite Element Model.

This study presents a new ultra-high temperature composite fabricated by using zirconium diboride (ZrB), silicon carbide (SiC), and tantalum carbide (TaC) with the volume ratios of 70%, 20%, and 10%, respectively. To attain this novel composite, an advanced processing technique of spark plasma sintering (SPS) was applied to produce ZrB-SiC-TaC. The SPS manufacturing process was achieved under pressure of 30 MPa, at 2000 °C for 5 min.

Novel precursor-derived Si-C-N ceramic material for purification application.

Metagenomic DNA (gDNA) is an important research topic because uncultivated microorganisms represent an interesting reservoir of genes with potential biotechnological applications. Here we describe a novel Si-C-N chromatography approach of gDNA extraction from environmental samples. Amorphous Si-C-N ceramic was obtained by the pyrolysis of a polymer precursor (polycarbosilazane) at 1350 degrees C in Ar.