3786 results about "Glass-ceramic" patented technology

The application relates to an article having a antimicrobial surface with a metal ion concentration, especially a Ag-concentration in a depth of about 0 um to about 2 um of the article measured from the surface higher than 0,6 wt %, preferably 0,8 weight-%, most preferably 1 weight-%.

A composition for a Coating System (paint) which forms an insulating material being designed to both reflect infrared radiation and have reduced thermal conductivity. The coating system may be either a single Thermal Coating or may be a Thermal Coating used in combination with a Thermal Primer. The Thermal Coating is formulated using conventional techniques and a resin used in paint manufacture, but utilizes primary pigments and extender mineral pigments which preferentially reflect in the infra red area of the solar spectrum. A method of characterizing particulate materials for their infra red reflectivity is described, which provides a means for preferential selection of particulate additives based on their relative visible light and infrared reflectivity. Additionally the incorporation of hollow micro-spheres is desired to reduce thermal conductivity. The Thermal Primer is designed to provide adhesion between the Thermal Coating and the substrate on which it is applied and uses conventional techniques to achieve those properties. However it has been found advantageous to incorporate hollow micro-spheres with low thermal conductivity, such as glass, ceramic or polymeric micro-spheres and/or an extender pigment with low thermal conductivity such as calcined clay to further reduce heat flow through the Coating System.

The invention relates to uses of glasses and glass-ceramics in dental and orthodontic applications.

Lithium disilicate based glass-ceramics contain high strength ceramic components for use in the manufacture of dental products. The glass-ceramics have good pressability, i.e., the ability to be formed into dental products by heat-pressing using commercially available equipment. The strength of the dental articles is increased with the inclusion of the high strength ceramic components.

There are provided glass-ceramics having a high lithium ion conductivity which include in mol %:

and contain Li_1+X(Al, Ga)_XTi_2−X(PO₄)₃ (where 0<X<0.8) as a main crystal phases. There are also provided glass-ceramics having a high lithium ion conductivity which include in mol %:

and contain Li_1+X+YM_XTi_2−XSi_YP_3−YO₁₂ (where 0<X≦0.4 and 0<Y≦0.6) as a main crystal phase. There are also provided solid electrolytes for an electric cell and a gas sensor using alkali ion conductive glass-ceramics, and a solid electric cell and a gas sensor using alkali ion conductive glass-ceramics as a solid electrolyte.

The invention relates to glass, ceramic and metal substrates with at least one self-cleaning surface, comprising a layer with a micro-rough surface structure which is arranged on the substrate and made at least partly hydrophobic. The layer contains a glass flux and structure-forming particles with a mean particle diameter within the 0.1 to 50 μm range; the glass flux and structure-forming particles are present in a volume ratio within the 0.1 to 5 range, and the micro-rough surface structure has a ratio of mean profile height to mean distance between adjacent profile tips within the 0.3 to 10 range.

To produce the subject of the invention the substrate is coated with a composition containing a glass flux and structure-forming particles, and the layer is burnt in and made hydrophobic.

The present invention relates to glass-ceramic materials, processes for making the same and articles comprising the same. The glass-ceramic material has a composition, by weight of the total composition, comprising 55-68% SiO₂; 18-24% Al₂O₃; 3.3-4.1% Li₂O; 1.5-4.0% ZnO; 1.5-5.0% MgO; 2-5% TiO₂; 0-2% ZrO₂; 0-5% B₂O₃; 0-8% P₂O₅; 0-2% Na₂O, 0-2% K₂O; and at least one component resulting from an effective amount of at least one fining agent; wherein: the total of B₂O₃ and P₂O₅ is at least 1.5% by weight, the total of MgO and ZnO is at least about 3.5% by weight, the total of Na₂O and K₂O is less than about 3.0% by weight, the total of P₂O₅, B₂O₃, Na₂O and K₂O is less than about 11% by weight, the weight ratio of the sum total of Na₂O+K₂O to the sum total of P₂O₅+B₂O₃

is less than about 0.5; advantageously the total of P₂O₅, B₂O₃, Na₂O and K₂O is less than about 9% by weight and the total of Na₂O ad K₂O is less than about 2% by weight; and more advantageously the total of P₂O₅, B₂O₃, Na₂O and K₂O is less than about 7% by weight and the total of Na₂O ad K₂O is less than about 1% by weight. The glass-ceramic material comprises β-spodumene solid solution as the predominant crystalline phase.

Al2O3-Y2O3-ZrO2/HfO2 ceramics (including glasses, crystalline ceramics, and glass-ceramics) and methods of making the same. Ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. The particles and fibers are useful, for example, as thermal insulation, filler, or reinforcing material in composites (e.g., ceramic, metal, or polymeric matrix composites). The thin coatings can be useful, for example, as protective coatings in applications involving wear, as well as for thermal management. Certain ceramic particles according to the present invention can be are particularly useful as abrasive particles.

The invention relates glass ceramic articles suitable for use as electronic device housing or enclosures which comprise a glass-ceramic material. Particularly, a glass-ceramic article housing/enclosure comprising a glass-ceramic material exhibiting both radio and microwave frequency transparency, as defined by a loss tangent of less than 0.5 and at a frequency range of between 15 MHz to 3.0 GHz, a fracture toughness of greater than 1.5 MPam 1/2 , an equibiaxial flexural strength (ROR strength) of greater than 100 MPa, a Knoop hardness of at least 400 kg/mm2, a thermal conductivity of less than 4 W/m DEG C and a porosity of less than 0.1 %.