# US 5,700,309 A · Method and powder mixture for repairing oxide based refractory bodies > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,309 A - Document ID: US5700309A - Status: Granted - Kind: A - Application number: 08/772,868 - Filed: 1996-12-26 - Granted: 1997-12-23 - Earliest claimed: 1993-12-01 - Assignees: Glaverbel - Inventors: Alexandre Zivkovic; Jean-Pierre Meynckens; Bernard Somerhausen - Web page: https://patentgrep.com/patent/US5700309A ## CPC - C04B 35/651: {Thermite type sintering, e.g. combustion sintering} - F27D 1/1647: {the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen} - 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 - F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE ## Abstract A method of repairing an oxide-based refractory body by projecting a powder mixture against a hot surface of the body and in the presence of oxygen to provide a refractory repair mass includes providing a powder mixture composed of particles of at least one refractory oxide; fuel particles which react in an exothermic manner with the oxygen to form a refractory oxide and which are particles composed of at least one element selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof; and particles of silicon carbide present in an amount which is effective to provide a reduced porosity of the refractory repair mass and which does not exceed 10% by weight based on the weight of the powder mixture; and projecting the powder mixture against a hot surface of the oxide-based refractory body and in the presence of oxygen. Preferably, the powder mixture contains at least 1%, most preferably from 1 to 5%, by weight of the particles of silicon carbide. Preferably, the particles of silicon carbide have a particle size of less than 200 .mu.m. ## Claims ### Claim 1 A method of repairing an oxide-based refractory body by projecting a powder mixture against a hot surface of the body and in the presence of oxygen to provide a refractory repair mass, the method comprising: a. providing a powder mixture comprised of: from 80% to 95% by weight of refractory particles comprised of at least one refractory oxide; and from 5% to 20% by weight of fuel particles which react in an exothermic manner with oxygen to form a refractory oxide and which are particles selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof, wherein the refractory particles further comprise particles of silicon carbide in an amount which is effective to provide a reduced porosity of a refractory repair mass produced from the powder mixture and which ranges from at least 1% by weight but does not exceed 10% by weight based on the total weight of the powder mixture; and b. projecting the powder mixture against a hot surface of the oxide-based refractory body and in the presence of oxygen. ### Claim 2 (depends on 1) The method according to claim 1, wherein the powder mixture contains from 1 to 5% by weight of the particles of silicon carbide. ### Claim 3 (depends on 2) The method according to claim 2, wherein the particles of silicon carbide have a particle size of less than 200 .mu.m. ### Claim 4 (depends on 1) The method according to claim 1, wherein the powder mixture contains from 70% to 94% by weight of the particles of at least one refractory oxide which are selected from the group consisting of alumina, magnesia, and mixtures thereof, from 5% to 20% by weight of the fuel particles which are comprised of at least one element selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof, and from 1% to 10% by weight of the particles of silicon carbide. ### Claim 5 (depends on 4) The method according to claim 4, wherein the powder mixture contains from 1 to 5% by weight of the particles of silicon carbide. ### Claim 6 (depends on 5) The method according to claim 5, wherein the particles of silicon carbide have a particle size of less than 200 .mu.m. ### Claim 7 (depends on 1) The method according to claim 1, wherein the powder mixture contains from 80% to 94% by weight of the particles of at least one refractory oxide which are selected from the group consisting of alumina, magnesia, and mixtures thereof, and from 5% to 15% by weight of the fuel particles which are comprised of at least one element selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof. ### Claim 8 (depends on 7) The method according to claim 7, wherein the powder mixture contains from 1 to 5% by weight of the particles of silicon carbide. ### Claim 9 (depends on 8) The method according to claim 8, wherein the particles of silicon carbide have a particle size of less than 200 .mu.m. ### Claim 10 (depends on 1) The method according to claim 1, wherein the particles of silicon carbide have a particle size of less than 200 .mu.m. ### Claim 11 (depends on 1) The method according to claim 1, wherein the oxide-based refractory body is comprised of at least one oxide, and wherein the particles of refractory oxide comprise at least one oxide of which the refractory body is comprised. ### Claim 12 A method of repairing an oxide-based refractory body by projecting a powder mixture against a hot surface of the body and in the presence of oxygen to provide a refractory repair mass, the method comprising: a. providing a powder mixture comprised of: from 80% to 95% by weight of refractory particles comprised of at least one refractory oxide; and from 5% to 20% by weight of fuel particles which react in an exothermic manner with oxygen to form a refractory oxide and which are particles selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof, wherein the refractory particles further comprise particles of silicon carbide in an amount which is effective to provide a reduced porosity of a refractory repair mass produced from the powder mixture and which ranges from at least 1% by weight but does not exceed 10% by weight based on the total weight of the powder mixture; and b. projecting the powder mixture against a hot surface of the oxide-based refractory body and in the presence of oxygen, wherein the oxide-based refractory body is selected from the group consisting of magnesium oxide-containing bodies. ### Claim 13 (depends on 1) The method according to claim 1, wherein a major portion of the powder mixture is comprised of the particles of at least one refractory oxide which are selected from the group consisting of magnesia, alumina, and mixtures thereof. ### Claim 14 (depends on 1) The method according to claim 1, wherein the oxide-based refractory body to be repaired is part of a ladle for handling molten-steel. ### Claim 15 A powder mixture for the repair of oxide-based refractory bodies, comprising: from 80% to 95% by weight of refractory particles comprised of at least one refractory oxide; and from 5% to 20% by weight of fuel particles which react in an exothermic manner with oxygen to form a refractory oxide and which are particles selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof, wherein the refractory particles further comprise particles of silicon carbide in an amount which is effective to provide a reduced porosity of a refractory repair mass produced from the powder mixture and which ranges from at least 1% by weight but does not exceed 10% by weight based on the total weight of the powder mixture. ### Claim 16 (depends on 15) The powder mixture according to claim 15, wherein the particles of silicon carbide have a particle size of less than 200 .mu.m. ### Claim 17 A powder mixture for the repair of oxide-based refractory bodies, comprising: from 80% to 94% by weight of particles of at least one refractory oxide which are selected from the group consisting of alumina, magnesia, and mixtures thereof; from 5% to 15% by weight of fuel particles which react in an exothermic manner with oxygen to form a refractory oxide and which are particles comprised of at least one element selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof; and from 1% to 5% by weight of particles of silicon carbide. ### Claim 18 (depends on 11) The powder mixture according to claim 11, wherein the particles of silicon carbide have a particle size of less than 200 .mu.m.