Abstract:
The present application discloses and claims a method to make a flexible ceramic fibers (Flexiramics TM ) and polymer composites. The resulting composite has an improved mechanical strength (tensile) when compared with the Flexiramics TM respective the nanofibers alone. Additionally a composite has better properties than the polymer alone such as lower fire retardancy, higher thermal conductivity and lower thermal expansion. Several different polymers can be used, both thermosets and thermoplastics. Flexiramics TM has unique physical characteristic and the composite materials can be used for numerous industrial and laboratory applications.
Abstract:
Described herein are nanofibers and methods for making nanofibers that have a plurality of pores. The pores have of any suitable size or shape. In some embodiments the pores are "mesopores", having a diameter between 2 and 50 nm. In some embodiments, the pores are "ordered", meaning that they have a substantially uniform shape, a substantially uniform size and/or are distributed substantially uniformly through the nanofiber. Ordering of the pores results in a high surface area and/or high specific surface area. Ordered pores, without limitation, result in a nanofiber that is substantially flexible and/or non-brittle. The nanofibers and methods for making nanofibers may be used, without limitation, in batteries, capacitors, electrodes, solar cells, catalysts, adsorbers, filters, membranes, sensors, fabrics and/or tissue regeneration matrixes.
Abstract:
Castable refractory compositions, refractory linings and articles formed therefrom and methods of installing a refractory from said castable refractory composition.
Abstract:
There is provided a method for the fabrication of porous SiC ceramic. The method comprises oxidizing particles of SiC ceramic thereby forming amorphous silica on the surface of the particles. The oxidized SiC particles are then mixed with an additive. Alternatively, layer(s) of the additive is (are) deposited on their surface by sol-gel technique. The oxidized SiC particles mixed or coated with the additive are then mixed with at least one pore-former. Alternatively, the oxidized SiC particles mixed or coated with the additive are coated with layer(s) of a polymer or pore-former by in-situ polymerization. In embodiments where the oxidized SiC particles are mixed with an additive and a pore-former or polymer, a further additive may be used. In each of these embodiments, the resulting product is then compacted into a green body which is heated and sintered to yield the porous SiC ceramic material. There is also provided a porous SiC ceramic fabricated by the method according to the invention.
Abstract:
The invention provides a cost effective and environmentally friendly process of manufacturing alumina-based, impact-resistant and wear-resistant ceramic objects from alumina of a lower purity. Particularly, the objects may serve as milling and grinding media, or as superior materials for ballistic and armor protection.
Abstract:
An extrusion method and apparatus are described for producing ceramics, glass, glass-ceramics, or composites suitable for use as proppants. The method includes forming one or more green body materials, extruding the green body materials to form a green body extrudate, separating and shaping the green body extrudate into individual green bodies, and sintering the green bodies to form proppants. The apparatus includes a means for forming an intimate mixture of green body materials, means to produce a green body extrudate, means for separating and shaping the green body extrudate into individual green bodies, and means to sinter the green green bodies to form proppants.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von Keramikfasern mit einer Zusammensetzung im Bereich SiC aus einer Polysilan-Polycarbosilan-Copolymer-Lösung enthaltenden Spinnmasse, wobei die Spinnmasse in einem Trockenspinnverfahren durch Spinndüsen extrudiert und durch einen Spinnschacht zu Grünfasern versponnen wird und die Grünfasern anschließend pyrolysiert werden. Erfindungsgemäß enthält die Polysilan-Polycarbosilan-Lösung zwischen 75 Gew.-% und 95 Gew.-%, insbesondere zwischen 80 und 90 Gew.-% an indifferentem Lösungsmittel und besitzen die Spinndüsen einen Kapillardurchmesser zwischen 20 und 70 μm, insbesondere zwischen 30 und 60 μm, insbesondere zwischen 40 und 50 μm.
Abstract:
A processing aid system composition containing fluoropolymer processing aid, polar-side-group-containing extrusion adjuvant, and poly(oxyalkylene) polymer enhances extrusion of polyolefins.
Abstract:
The invention concerns new thermoplastic moulding compounds for the manufacture of mouldings made of ceramic material or metal from the appropriate ceramic or metal powders. Thermoplastic moulding compounds can be used for instance in injection-moulding, extrusion or hot-pressing processes in which it is necessary for the moulding compound to have temperature-dependent flow characteristics.
Abstract:
Methods of making ceramic matrix prepregs are described. The methods include exposing a coated tow of ceramic fibers to a ceramic matrix slurry comprising a solvent and ceramic precursor. The coating is at least partially removed and the slurry infuses into the ceramic fibers to form prepreg. Steps to form ceramic matrix composites are also described, including forming the prepreg into a green body, and sintering the ceramic precursor.