Glaverbel

Fosbel International Limited

Jean-Pierre Meynckens

Bernard Somerhausen

Leon-Philippe Mottet

Jean-Pierre Robert

Alexandre Zivkovic

Robert Mercier

L&eacute;on-Philippe Mottet

Rene Staffolani

A ceramic welding process for the formation of a coherent refractory repair mass on a surface of an electrocast refractory material includes providing an electrocast refractory material having a surface to be repaired; providing a first powder mixture comprised of combustible particles, refractory particles, and at least one constituent which enhances production of a vitreous phase in the coherent refractory repair mass; and projecting the first powder mixture in a gas stream containing oxygen against the surface to be repaired so that the combustible particles react with the projected oxygen against the surface in a highly exothermic manner and release sufficient heat of combustion to form a first coherent refractory repair mass.

Formation of a refractory repair mass

Apparatus and process for one of flame treatment or ceramic welding, the apparatus including a single tubular lance having a tip end, a butt end, and a head portion with a central main bore provided at the tip end so that ceramic welding materials comprised of particulate material containing oxidizable particles and combustion-supporting carrier gas are introduced at the butt end, pass through the main bore and emerge at the tip end during ceramic welding; wherein the head portion further comprises at least one conduit to convey a mixture of a fuel gas and a combustion-supporting gas, each of the at least one conduit having an orifice at the tip end of the single tubular lance and being provided with a portion for introduction of fuel gas and a portion for introduction of combustion-supporting gas so that fuel gas and combustion-supporting gas introduced at the butt end combine in the at least one conduit and emerge to form a flame at the tip end of the at least one conduit during flame treatment, and wherein the head portion is formed in two parts including an inner block including the central main bore, the conduits for fuel gas and combustion-supporting gas, and respective outlet orifices of the central main bore and at least one conduit, and an outer block including supply passageways to the inner block from respective supply tubes for particulate material and combustion-supporting carrier gas and for fuel gas and combustion-supporting gas.

Lance for heating or ceramic welding

Cutting refractory material

A ceramic welding process for forming a coherent refractory mass on a surface of a refractory which is hot and which is comprised of at least one silicon compound includes providing a mixture composed of combustible particles including silicon particles, refractory particles which are silicon carbide particles and which constitute a major portion by weight of the mixture, and particles of one of (a) another substance selected from the group consisting of CaO, MgO, FeO, and mixtures thereof or (b) particles of a nonmetallic precursor of the another substance, which another substance causes incorporation of silica, formed by combustion of the silicon particles, into a crystalline lattice of a compound formed between the silica and the another substance within the coherent refractory mass being formed; and projecting the mixture against the surface of the refractory, simultaneously with substantially pure oxygen, so that the combustible particles react in an exothermic manner by combusting with the projected oxygen and release sufficient heat to form the coherent refractory mass under action of heat of combustion, and so that silica, formed by combustion of the silicon particles, is incorporated into the crystalline lattice of a compound formed between the silica and the another substance.

Process and mixture for forming a coherent Refractory mass on a surface

Process and apparatus for making ceramic articles

Production of a siliceous refractory mass

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.

Method and powder mixture for repairing oxide based refractory bodies

A process for forming a coherent refractory mass on a surface of a refractory, which refractory includes at least one silicon compound, the process including providing a mixture including (1) combustible particles including silicon particles, (2) refractory particles of one or a plurality of substances which constitute a major portion by weight of the mixture, and (3) particles of another substance or precursor of the another substance which particles are nonmetallic and which another substance causes incorporation of silica, formed by combustion of the silicon particles, into a crystalline lattice of a compound formed between the silica and the another substance within the coherent refractory mass to be formed; and projecting the mixture against the surface of a refractory, simultaneously with oxygen, so that the combustible particles react in an exothermic manner with the projected oxygen and release sufficient heat to form the coherent refractory mass under action of heat of combustion and so that silica is formed by combustion of the silicon particles, which silica is incorporated into the crystalline lattice of the compound formed between the silica and the another substance such that the coherent refractory mass adheres durably to the surface of the refractory and retains this adherence under repeated variations in thermal conditions.

Process for forming a coherent refractory mass on a surface

A process for cleaning a surface of a refractory structure which is at an elevated temperature, including projecting against the surface a comburent gas stream which is a powder stream including fuel particles carried in an oxygen-containing carrier gas the comburent gas stream impinging upon the surface at an impingement zone, whereby the fuel particles are caused or allowed to burn in a reaction zone defined generally around the impingement zone and the heat generated by the combustion of the fuel particles causes the surface or material adhered thereto to melt and provide a melted material, and projecting a scouring stream including oxygen simultaneously or alternately at the surface to scour the surface in the vicinity of the reaction zone and thereby clean the surface due to the scouring stream blowing away the melted material.

Growing community of inventors

Villers-Perwin, Belgium

Jean-Pierre Meynckens