The invention relates to a water-based ceramic three-dimensional laminate material and a method for using the same material to manufacture the ceramic objects, comprising: a step Sa of preparing a plurality of projected slice graphics and a slurry, wherein the projected slice graphics are formed by slicing a three-dimensional image along a specific direction with a specific thickness, the slurry is prepared by mixing the material powder, the photo-curing resin, the solvent and the additive; a step Sb of uniformly laying the slurry on the substrate to form a sacrificial layer; and a step Sc of uniformly laying the slurry on the slurry to form a reaction layer on the sacrificial layer; a step Sd of irradiating the reaction layer with a light beam according to one of the plurality of projected slice graphics, and the slurry is cured after being irradiated; a step Se of repeating steps Sc and Sd until a ceramic body is formed; a step Sf of washing the ceramic body with water or an organic solvent; and a step Sg of sintering the ceramic body at a high temperature to form a ceramic object.

The invention relates to a water-based ceramic three-dimensional laminate material and a method for using the same material to manufacture the ceramic objects, comprising: a step Sa of preparing a plurality of projected slice graphics and a slurry, wherein the projected slice graphics are formed by slicing a three-dimensional image along a specific direction with a specific thickness, the slurry is prepared by mixing the material powder, the photo-curing resin, the solvent and the additive; a step Sb of uniformly laying the slurry on the substrate to form a sacrificial layer; and a step Sc of uniformly laying the slurry on the slurry to form a reaction layer on the sacrificial layer; a step Sd of irradiating the reaction layer with a light beam according to one of the plurality of projected slice graphics, and the slurry is cured after being irradiated; a step Se of repeating steps Sc and Sd until a ceramic body is formed; a step Sf of washing the ceramic body with water or an organic solvent; and a step Sg of sintering the ceramic body at a high temperature to form a ceramic object.

Glass articles and methods for modifying a composition of a surface portion of the glass article are disclosed. The method includes heating the surface portion of the glass article with a laser beam to a temperature within a range of about 1100?C to about 2200?C such that the heating evaporates one or more metalloids and/or one or more alkali metals present at the surface portion, and modifies the composition of the surface portion such that the surface portion has a lower alkali metals concentration and/or a lower metalloids concentration as compared to a portion of the glass article that is not heated by the laser beam.

Disclosed herein are opaque glass-ceramics comprising at least one nepheline crystal phase and comprising from about 30 mol % to about 65 mol % SiO.sub.2, from about 15 mol % to about 40 mol % Al.sub.2O.sub.3, from about 10 mol % to about 20 mol % (Na.sub.2O+K.sub.2O), and from about 1 mol % to about 10 mol % (ZnO+MgO). Also disclosed herein are opaque-glass ceramics comprising at least one nepheline crystal phase and at least one spinel-structure phase doped with at least one colorant chosen from transition metals and rare earth elements. Further disclosed herein are methods for making these opaque glass-ceramics.

The present application provides LAS type transparent glass-ceramics of β-quartz of composition containing a high content of zinc, articles constituted at least in part of said glass-ceramics, glasses precursors of said glass-ceramics (with a low viscosity at high temperature), and also a method of preparing said articles. Said glass-ceramics present a composition, free of arsenic oxide and antimony oxide, except for inevitable traces, expressed as percentages by weight of oxides, containing: 64.5% to 66.5% of SiO.sub.2; 19.0% to 20.6% of Al.sub.2O.sub.3; 3.0% to 3.6% of Li.sub.2O; 0 to 1% of MgO; 1.7% to 3.4% of ZnO; 2% to 3% of BaO; 0 to 3% of SrO; 0 to 1% of CaO; 2% to 4% of TiO.sub.2; 1% to 2% of ZrO.sub.2; 0 to 1% of Na.sub.2O; 0 to 1% of K.sub.2O; with Na.sub.2O+K.sub.2O+BaO+SrO+CaO≤6%; optionally up to 2% of at least one fining agent comprising SnO.sub.2; and optionally up to 2% of at least one coloring agent.

Provided is mold flux that can prevent longitudinal cracks from forming on a surface of a slab upon continuous-casting hypo-peritectic steel, wherein CaO, SiO.sub.2, an alkali metal oxide and a fluorine compound are contained, 1.1≦(CaO).sub.h/(SiO.sub.2).sub.h≦1.9, 0.10≦(CaF.sub.2).sub.h/((CaO).sub.h+(SiO.sub.2).sub.h+(CaF.sub.2).sub.h)≦0.40 and 0≦(alkali metal fluoride).sub.h/((CaO).sub.h+(SiO.sub.2).sub.h+(alkali metal fluoride).sub.h)≦0.10 are satisfied, a solidification temperature is no less than 1300° C., and viscosity at 1450° C. is no more than 0.1 Pa.Math.s.

Provided is mold flux that can prevent longitudinal cracks from forming on a surface of a slab upon continuous-casting hypo-peritectic steel, wherein CaO, SiO.sub.2, an alkali metal oxide and a fluorine compound are contained, 1.1≦(CaO).sub.h/(SiO.sub.2).sub.h≦1.9, 0.10≦(CaF.sub.2).sub.h/((CaO).sub.h+(SiO.sub.2).sub.h+(CaF.sub.2).sub.h)≦0.40 and 0≦(alkali metal fluoride).sub.h/((CaO).sub.h+(SiO.sub.2).sub.h+(alkali metal fluoride).sub.h)≦0.10 are satisfied, a solidification temperature is no less than 1300° C., and viscosity at 1450° C. is no more than 0.1 Pa.Math.s.

Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.

Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.

A transparent, colorless and non-scattering glass-ceramic plate of lithium aluminosilicate type and containing crystals of β-quartz structure, the chemical composition of which does not contain oxides of arsenic, of antimony and of neodymium, and includes the following constituents within the limits defined below, expressed as weight percentages: SiO.sub.2 55-75%; Al.sub.2O.sub.3 12-25%; Li.sub.2O 2-5%; Na.sub.2O+K.sub.2O 0-<2%; Li.sub.2O+Na.sub.2O+K.sub.2O 0-<7%; CaO 0.3-5%; MgO 0-5%; SrO 0-5%; BaO 0.5-10%; CaO+BaO >1%; ZnO 0-5%; TiO.sub.2 ≦1.9%; ZrO.sub.2 ≦3%;TiO.sub.2+ZrO.sub.2 >3.80%; SnO.sub.2 ≧0.1%; SnO.sub.2/(SnO.sub.2+ZrO.sub.2+TiO.sub.2)<0.1.