Patent classifications
C04B2235/9615
ZIRCONIA MILL BLANK HAVING MAXIMUM VALUE OF deltaSP(m) OF STABILIZER CONCENTRATION LESS THAN 0.5
To provide a zirconia mill blank for dental cutting and machining that can impart translucency gradation and color gradation similar to a natural tooth to a zirconia perfect sintered body without the need for special equipment.
To provide a zirconia mill blank for dental cutting and machining comprising two opposing surfaces and a side surface between the two opposing surfaces, wherein the side surface has a rectangular shape in a side view of the zirconia mill blank for dental cutting and machining, and in a case in which one of the two opposing surfaces is defined as surface A, the other surface of the two opposing surfaces is defined as surface B, a surface which is parallel to the surface A and is located at a position of 1.0 mm to 1.5 mm from the surface A toward the surface B in a direction parallel to the side surface is defined as surface C, points which are set to having 0.5 mm of distance on the straight line in the direction parallel to the side surface from the surface C toward the surface B in the area from the surface C to the surface B are defined as point P(1), point P(2), to point P(n) in the order from the surface C, a stabilizer concentration (mol %) at each point is defined as SP(1), SP(2), to SP(n) (n?((shortest distance (mm) between the surface C and the surface B)?2)/0.5), the maximum value of the stabilizer concentration (mol %) is defined as SPmax, the minimum value of the stabilizer concentration (mol %) is defined as SPmin, and the maximum value of ASP(m) defined by the following formula is defined as ?SPmax, the zirconia mill blank for dental cutting and machining has a portion where the value of SPmax?Spmin which is a difference between the SPmax and the SPmin is 0.3 or more, and the ?SPmax is less than 0.5.
METHOD FOR ADDITIVE MANUFACTURING OF 3D-PRINTED ARTICLES
The present invention provides a method of additive manufacturing a 3D-printed article, comprising: (a) printing and depositing one or more layers of a slurry by using a 3D printer, wherein the slurry comprises a ceramic powder composition; (b) further injecting an oil around the one or more layers of slurry, wherein the height of the injected oil is lower than the height of the slurry; (c) repeating steps (a) and (b) until a main body with desired geometric shape is obtained; and (d) sintering the main body by heating to obtain the 3D-printed article wherein the temperature of a printing carrier of the 3D printer is from 30 to 80 C.
METHODS OF MAKING POROUS CERAMIC ARTICLES
Methods for making ceramic articles, and methods for reducing extrusion pressure during processes of making ceramic articles, are disclosed. The methods include mixing a ceramic batch composition comprising amylose and amylopectin in an amylose:amylopectin ratio ranging from about 30:70 to about 95:5, and extruding the ceramic batch composition through an extrusion die to form an extruded green ceramic article.
METHOD FOR FORMING A THREE DIMENSIONAL BODY FROM A MIXTURE WITH A HIGH CONTENT OF SOLID PARTICLES
A method for continuously forming a three-dimensional body from a mixture, the mixture comprising at least 15 vol % solid particles and a radiation curable material. The method allows the continuous production of three-dimensional bodies comprising to a high content ceramic particles at a forming speed of at least 25 mm/hour.
A COMPOSITION FOR REFRACTORY MATERIAL
A composition for a refractory material comprising a base mixture having a composition in oxide (mol %) as follows: SiO2 between 69% and 73%; Al2O3 between 22% and 28%; TiO2 between 0.4% and 1%; Fe2O3 between 0.2% and 1%; CaO between 0.1% and 1%; MgO between 0.1% and 1%; K.sub.2O between 0.5% and 2%; Na.sub.2O between 0.1% and 0.5%; and comprising a filler mixture comprising at least one from between a schamotte and a smelting agent.
METHOD FOR PRODUCING SILICON CARBIDE SINTERED BODY
A method for producing a silicon carbide sintered body, comprising: a step 1 of adding water to a raw material mixture containing silicon carbide powder, at least one binder, and optionally at least one carbon source other than the silicon carbide and the at least one binder, and subjecting the raw material mixture with water to kneading, molding, and drying in this order, to obtain a dried body; a step 2 of heating the dried body obtained in the step 1 to remove organic substances from the dried body to obtain a degreased body; and a step 3 of firing the degreased body obtained in the step 2 in an inert atmosphere to obtain a silicon carbide sintered body, wherein the method comprises controlling an expansion/shrinkage rate of the sintered body in the step 3 by adjusting one or two or three selected from the group consisting of (1) an amount of the at least one carbon source other than the silicon carbide and the at least one binder in the raw material mixture, (2) an amount of the at least one binder in the raw material mixture, and (3) a degreasing rate in the step 2.
REFRACTIVE INDEX MATCHING BASE RESIN FOR EXTREMELY FINE THREE-DIMENSIONAL CERAMIC STRUCTURES
A ceramic product includes a printed self-supporting three-dimensional ceramic structure formed by additive manufacturing. The printed self-supporting three-dimensional ceramic structure includes a pre-defined geometric arrangement of features having an average diameter in a range of greater than 50 nanometers to less than 1000 nanometers.
Three-dimensional shaped article production method
A three-dimensional shaped article production method for producing a three-dimensional shaped article by stacking layers to form a stacked body includes a constituent layer formation step of forming a constituent layer which corresponds to a constituent region of the three-dimensional shaped article, a support layer formation step of forming a support layer which is in contact with the constituent layer and supports the constituent layer, and a sintering step of sintering the constituent layer, wherein the support layer is configured such that as compared with the volume decrement accompanying the sintering step of a space surrounded by the constituent layer from at least two directions, the volume decrement accompanying the sintering step of the support layer which supports the constituent layer in the space is larger.
Method of making a refractory article
A method of making a refractory article is provided. The method includes: a) mixing a binder system, a refractory charge, and a second colloidal binder to form an aqueous slurry; b) casting the aqueous slurry into a mold; c) subjecting the mold containing the aqueous slurry to a temperature that is lower than a slurry casting temperature for a time sufficient to form a green strength article; and d) firing the green strength article at a temperature of at least 450? C. for a time sufficient to achieve thermal homogeneity, thereby forming a refractory article. Refractory articles made in accordance with the method have a unique combination of pore structure and mechanical properties.
Method of Coloring Multi-Layered Pre-Sintered Dental Restoration
A method of coloring a pre-sintered dental restoration comprises securing a pre-sintered dental restoration having multiple different layers having a different chemical composition of color pigments between adjacent layers; dipping the pre-sintered dental restoration into a coloring liquid, and sintering the pre-sintered dental restoration to acquire a fully sintered ceramic restoration having a translucency and color intensity/chroma with an inverse relationship with the translucency increasing in one direction of the restoration and the color intensity/chroma decreasing in the same direction of the restoration.