# US 2021/0002181 A1 · Process For Producing A Glazed Ceramic Body > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0002181 A1 - Document ID: US20210002181A1 - Status: Published application - Kind: A1 - Application number: 16/488,690 - Filed: 2018-03-23 - Published: 2021-01-07 - Earliest claimed: 2017-03-23 - Assignees: Ivoclar Vivadent AG - Applicants: Ivoclar Vivadent AG - Inventors: Frank Rothbrust; Ronny Hengst; Sebastian Krolikowski; Christan Ritzberger; Diana Tauch - Web page: https://patentgrep.com/patent/US20210002181A1 ## CPC - C04B 41/5022: {with vitreous materials (composition of vitreous glazes and enamels C03C; ceramic pigments C09C1/0009)} - A61C 13/083: Porcelain or ceramic teeth {(A61C13/081 takes precedence; preparations A61K6/80)} - C03C 3/083: containing aluminium oxide or an iron compound - C03C 4/0021: {for dental use} - C03C 8/02: Frit compositions, i.e. in a powdered or comminuted form - C04B 41/009: {characterised by the material treated} - C04B 41/86: Glazes; Cold glazes - C03C 2205/06: for dental use - C03C 2209/00: Compositions specially applicable for the manufacture of vitreous glazes - C04B 2111/00836: {for medical or dental applications} - C04B 2201/10: for the viscosity - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00) - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS ## Abstract The invention relates to a process for producing a glazed ceramic body, in which (a) a glazing material is applied to a non-densely sintered substrate material and (b) the substrate material and the glazing material are subjected to a heat treatment in a temperature range which extends from a first temperature T1 to a second temperature T2, which is higher than the first temperature, in order to obtain the glazed body. The invention also relates to the use of a glazing material for glazing a non-densely sintered substrate material. ## Claims ### Claim 1 Process for producing a glazed ceramic body, comprising (a) a glazing material is applied to a non-densely sintered substrate material and (b) the substrate material and the glazing material are subjected to a heat treatment in a temperature range which extends from a first temperature TI to a second temperature T2, which is higher than the first temperature, in order to obtain the glazed body, wherein, at the temperature T1, the glazing material has a viscosity of more than 102.5 Pa·s, and, at the temperature T2, a viscosity of less than 109 Pa·s. ### Claim 2 (depends on 1) Process according to claim 1, in which, at the temperature T1, the glazing material has a viscosity of more than 105.6 Pa·s, and, at the temperature T2, a viscosity of less than 105.6 Pa·s. ### Claim 3 (depends on 1) Process according to claim 1, in which the non-densely sintered substrate material is a presintered substrate material. ### Claim 4 (depends on 1) Process according to claim 1, in which the non-densely sintered substrate material has a relative density in the range of from 30 to 90%, based on the true density of the substrate material. ### Claim 5 (depends on 1) Process according to claim 1, in which the substrate material begins to sinter at the temperature T1. ### Claim 6 (depends on 1) Process according to claim 1, in which the substrate material is kept at the temperature T2 for a period of 5 to 120 minutes. ### Claim 7 (depends on 1) Process according to claim 1, in which, at the temperature T2, the substrate material has a relative density of at least 97%, based on the true density of the substrate material. ### Claim 8 (depends on 1) Process according to claim 1, in which, at a temperature Tx, at which the substrate material has a relative density of 95%, based on the true density of the substrate material, the glazing material has a viscosity of more than 102.5 Pa·s. ### Claim 9 (depends on 1) Process according to claim 1, in which the glazing material has, at the temperature T1, a viscosity of more than 105.6 Pa·s, at the temperature Tx, at which the substrate material has a relative density of 95%, based on the true density of the substrate material, a viscosity of more than 102.5 Pa·s, and, at the temperature T2, a viscosity of less than 109 Pa·s. ### Claim 10 (depends on 1) Process according to claim 1, in which the substrate material is an oxide ceramic or an inorganic-inorganic composite material. ### Claim 11 (depends on 1) Process according to claim 1, in which the substrate material comprises at least two layers, which differ in their colour. ### Claim 12 (depends on 1) Process according to claim 1, in which, at a temperature of 950° C., the glazing material has a viscosity of more than 102.5 Pa·s, at a temperature of 1300° C., a viscosity of more than 102.5 Pa·s and, at a temperature of 1450° C., a viscosity of less than 109 Pa·s. ### Claim 13 (depends on 1) Process according to claim 1, in which, at a temperature of 700° C., the glazing material has a viscosity of more than 102.5 Pa·s, at a temperature of 900° C., a viscosity of more than 102.5 Pa·s and, at a temperature of 1100° C., a viscosity of less than 109 Pa·s. ### Claim 14 (depends on 1) Process according to claim 1, in which the glazing material comprises a frit, which comprises SiO2, Al2O3 and K2O and/or Na2O, and contains at least one or all of the following components in the given amounts: Component wt.-% SiO2 50.0 to 80.0 Al2O3 10.0 to 30.0 K2O 0 to 20.0 Na2O 0 to 10.0 CaO 0 to 10.0 BaO 0 to 10.0 ### Claim 15 (depends on 1) Process according to claim 1, in which the glazing material is applied to the substrate material in the form of a powder, a slip, a spray or a lacquer, by an airbrushing method or incorporated into a film or an adhesive strip. ### Claim 16 (depends on 1) Process according to claim 1, in which the glazing material is used in the form of a composition which further comprises at least one carrier and/or solvent and/or at least one inorganic and/or organic filler. ### Claim 17 (depends on 1) Process according to claim 1, in which the glazing material does not substantially penetrate into the substrate material. ### Claim 18 (depends on 1) Process according to claim 1, in which the glazed ceramic body is a glazed dental body or a glazed dental restoration or a bridge, an inlay, an onlay, a crown, a veneer, a facet or an abutment. ### Claim 19 Process of using a glazing material for glazing a non-densely sintered substrate material, wherein the glazing material is applied to the non-densely sintered substrate material and the substrate material and the glazing material are subjected to a heat treatment in a temperature range which extends from a first temperature T1 to a second temperature T2, which is higher than the first temperature, wherein, at the temperature T1, the glazing material has a viscosity of more than 102.5 Pa·s and, at the temperature T2, a viscosity of less than 109 Pa·s.