Si2N2O is considered as a new great potential structural/functional candidate in place of Si3N4. The amorphous Si3N4 nanopowder was incorporated into silica sol by adding of MgO and Y2O3 as sintering aid. Synthesized powders were heated by spark plasma sintering at a heating rate of 100 oC/min yielded fully dense compacts at 1550 and 1750 oC for 40 min. The phase formation of samples was charac...

In this paper the feasibility of fabricating controlled porous skeleton of pure tungsten at low temperature by addition of submicron particles to tungsten powder (surface activated sintering) has been studied and the best parameters for subsequent infiltration of Cu were acquired. The effects of addition of submicron particles and sintering temperature on porous as well as infiltrated samples w...

Nanocrystalline apatites analogous to bone mineral are very promising materials for the preparation of highly bioactive ceramics due to their unique intrinsic physico-chemical characteristics. Their surface reactivity is indeed linked to the presence of a metastable hydrated layer on the surface of the nanocrystals. Yet the sintering of such apatites by conventional techniques, at high temperat...

In this paper, lead free (K0.48,Na0.52)NbO3 (KNN(48-52)) piezoelectric ceramics were made by conventional solid state sintering process. Additives of nano ZnO (n-ZnO), nano CuO (n-CuO) and nano SnO2 (n-SnO2) were used in order to decrease the sintering temperature, as well as modifying the dielectric, piezoelectric and ferroelectric propert...

Layer-wise slurry deposition (LSD) is an approach in solid freeform fabrication (SFF), that can be used for fabrication of hydroxyapatite (HA) bone implants. In view of biocompatibility, HA is a suitable ceramic material for hard tissue replacement implants. SFF technique is the prototyping of objects directly from computer models without part-specific tooling or human intervention. A slurry is...

Cermets are ceramic metal composites. The metallic phase in the cermet typically undergoes oxidation during sintering air. Electric field-assisted processes such as technology/spark plasma (FAST/SPS) and flash involves very high heating rates, short processing time low temperature. main aim of this work was to see if techniques can prevent cermet. Sintering behavior 8YSZ-5 wt.% Ni studied by th...

As the additive manufacturing (AM) industry continues to boom, the material palette continues to grow. However, the materials applicable to selective laser sintering (SLS) remains limited. Typically, the scanning laser beam heats each location for milliseconds at a time with a very high heating flux followed by quick cooling. This can create large temperature gradients and high local temperatur...

A multichannel mixed-conducting hollow fiber (MMCHF) membrane, 0.5 wt % Nb2O5-doped SrCo0.8 Fe0.2O3-d (SCFNb), has been successfully prepared by phase inversion and sintering technique. The crystalline structure, morphology, sintering behavior, breaking load, and oxygen permeability of the MMCHF membrane were studied systematically. The MMCHF membrane with porous-dense asymmetrical microstructu...