Abstract

The invention relates to sintered, polycrystalline, flat, geometrically structured ceramic grinding elements for use in resin-bonded grinding disks, in particular cutting disks. The invention also relates to a method for manufacturing flat, geometrically structured ceramic grinding elements of said type as well as to the use thereof.

IPC Classes  ?

• B24D 3/28 - Resins
• B24D 5/12 - Cut-off wheels

Abstract

The present invention relates to a sintered zirconia mullite refractory composite material, comprising 55-65 wt.% of Al2O3, 15-25 wt.% of SiO2, 15-25 wt.% of ZrO2 and less than 3 wt.% of raw material impurities, wherein the mineralogical composition of the composite material is 65-85 wt.% of mullite and 15-35 wt.% of zirconium dioxide.

IPC Classes  ?

• C04B 35/106 - Refractories from grain sized mixtures containing zirconium oxide or zircon (ZrSiO4)
• C04B 35/119 - Composites with zirconium oxide
• C04B 35/626 - Preparing or treating the powders individually or as batches

Abstract

The present invention relates to heat treated alumina zirconia abrasive grains. Abrasive grains based on Al2O3 and ZrO2 fused in an electric arc furnace, having a weight content of Al2O3 between 52% und 62% by weight, ZrO2 + HfO2 between 35% and 45% by weight, with at least 6 % by weight, based on the total weight content of ZrO2, being present in the tetragonal and/or cubic high temperature modifications of Zr(¾, Si-compounds between 0.2% and 0.7% by weight, expressed as SiO2, carbon between 0.03% and 0.5% by weight, additives between 0.5% und 10% by weight, and raw-material-based impurities of less than 3% by weight are heat treated in air between 350°C and 700°C for a time period of 1 to 6 hours using a rotary kiln.

IPC Classes  ?

• C09K 3/14 - Anti-slip materialsAbrasives

Abstract

The present invention relates to a transparent surface protection layer on the basis of synthetic resin comprising transparent solid particles, which comprise at least three different grain size fractions and encompass a Mohs hardness of at least 4» which are incorporated into the synthetic resin matrix, wherein the grain size fractions in each case encompass a monomodal grain size distribution and the solid particles are present as trimodal grain size distribution comprising a coarse fraction, a medium fraction and a fine fraction.

IPC Classes  ?

• D21H 27/18 - Paper-based or board-based structures for surface covering
• B44C 5/04 - Ornamental plaques, e.g. decorative panels, decorative veneers
• D21H 27/24 - Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the surface to be covered being phenolic-resin paper laminates, vulcan fibre or similar cellulosic fibreboards
• D21H 27/26 - Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
• B32B 29/00 - Layered products essentially comprising paper or cardboard
• B32B 27/04 - Layered products essentially comprising synthetic resin as impregnant, bonding, or embedding substance
• E04F 15/00 - Flooring

Abstract

The present invention refers to an agglomerate abrasive grain made up of a mixture of individual abrasive grains and hollow bodies, wherein the abrasive grains and the hollow bodies are held together by means of a binding matrix of aluminosilicate and alkali silicate and the agglomerate abrasive grain has an open porosity and a closed porosity in each case of between 5% by volume and 40% by volume, wherein the total porosity of the agglomerate abrasive grain is less than 50% by volume.

IPC Classes  ?

• C09K 3/14 - Anti-slip materialsAbrasives
• B24D 3/14 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
• C04B 28/00 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
• C04B 28/26 - Silicates of the alkali metals
• C04B 18/02 - Agglomerated materials

Abstract

The present invention relates to a refractory composition comprising 70 weight percent to 98 weight percent particulate refractory material and 2 weight percent to 30 weight percent of a binder phase comprising reactive filler and a binder, said binder phase substantially comprises solely reactive andalusite as reactive filler.

IPC Classes  ?

• C04B 35/101 - Refractories from grain sized mixtures
• C04B 35/18 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on silicates other than clay rich in aluminium oxide
• C04B 35/185 - Mullite
• C04B 35/66 - Monolithic refractories or refractory mortars, including those whether or not containing clay
• F23M 5/04 - Supports for linings

Abstract

The invention relates to polycrystalline Al2O3 bodies based on melted aluminum oxide having an average crystallite size of the primary crystals between 20 μm and 100 μm and a closed macroporosity between 10 vol% and 30 vol%. The polycrystalline Al2O3 bodies are obtained by casting and quenching a liquid aluminum oxide melt while simultaneously seeding the poured stream with seed crystals and can be advantageously used to produce grinding elements and fireproof products.

IPC Classes  ?

• C01F 7/02 - Aluminium oxideAluminium hydroxideAluminates
• C09K 3/14 - Anti-slip materialsAbrasives

Abstract

The invention relates to abrasive grains based on zirconia alumina melted in an electric arc furnace, comprising a content of 52 to 62 wt % Al2O3 and 35 to 45 wt % ZrO2, wherein the high-temperature phases of the zirconia are stabilized by a combination of reduced Ti compounds and yttrium oxide.

IPC Classes  ?

• C09K 3/14 - Anti-slip materialsAbrasives

Abstract

Slurry which contains a) from (50) to (80)% by weight of refractory particles having an average particle size of from (0.5) m to (150) m, b) from (5) to (35)% by weight of aluminium oxide particles having an average particle diameter of less than (300) nm and c) from (5) to (35)% by weight of water and d) a pH of from (5) to (12). Process for producing the slurry using a dispersion, and also the dispersion itself. Process for producing a casting mould, and also the casting mould itself.

IPC Classes  ?

• B22C 9/02 - Sand moulds or like moulds for shaped castings
• B22C 9/22 - Moulds for peculiarly-shaped castings
• B22C 9/24 - Moulds for peculiarly-shaped castings for hollow articles
• B22C 13/08 - Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
• B22C 1/08 - Compositions of refractory mould or core materialsGrain structures thereofChemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for decreasing shrinkage of the mould, e.g. for investment casting

Abstract

The invention relates to a wear protection coating having a mixture of non-homogenous transparent resin particles embedded in a matrix material and having a Mohs hardness of at least 6, and transparent solid particles, wherein the transparent solid particles comprise a bimodal grain size distribution. The invention further relates to a method for producing a wear protection coating and to the use thereof for producing wear-resistant surfaces, in particular surfaces of wood fiber boards having decorations.

IPC Classes  ?

• B44C 5/04 - Ornamental plaques, e.g. decorative panels, decorative veneers
• B32B 29/00 - Layered products essentially comprising paper or cardboard
• E04F 15/00 - Flooring
• C09D 7/12 - Other additives
• B27N 7/00 - After-treatment, e.g. reducing swelling or shrinkage, surfacingProtecting the edges of boards against access of humidity
• D21H 27/28 - Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures treated to obtain specific resistance properties, e.g. against wear or weather

Abstract

The present invention relates to abrasive grain agglomerates composed of fine-particle primary abrasive grains which are held together by means of a binder based on an aluminosilicate having a molar ratio of Al2O3 to SiO2 of from 1:2 to 1:20. The particular advantage of these abrasive grain agglomerates is that the binder cures fully at below 450°C, preferably below 400°C, to form abrasive grain agglomerates having an extraordinarily high strength.

IPC Classes  ?

• B24D 3/00 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents
• B24D 3/02 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
• B24D 3/04 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
• B24D 3/14 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
• B24D 3/18 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings for porous or cellular structure
• C04B 12/00 - Cements not provided for in groups
• C09K 3/14 - Anti-slip materialsAbrasives

Abstract

The invention relates to a method for treating the surfaces of solid particles to improve the processability of the solid particles in the electrostatic field and to reduce the dust formation which occurs during the processing of the solid particles.

IPC Classes  ?

• C09K 3/14 - Anti-slip materialsAbrasives

Abstract

The present invention relates to sintered abrasive grit agglomerates based on aluminum oxide, having homogeneously distributed nanoscale pores in the range of 100-300nm, with a pore volume of at least 15%. The average diameter of primary particles of the aluminum oxide primary particles is less than 5μm, wherein said primary particles are connected to each other without additional adhesive agent.

IPC Classes  ?

• C09K 3/14 - Anti-slip materialsAbrasives

Abstract

The invention relates to an anti-abrasion layer, comprising a mixture of irregular particles of hard material and round particles essentially free of cutting edges embedded in a matrix material and the use thereof for the production of anti-abrasion surfaces on wood materials, decorative paper, or wood fibre sheets printed with patterns for the production of, parquet floors, floor laminates, furniture surfaces or work boards and for the production of wear-resistant surface layers on support materials made from metal, glass, ceramics, plastic concrete or other materials.

IPC Classes  ?

• D21H 27/28 - Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures treated to obtain specific resistance properties, e.g. against wear or weather
• B32B 27/04 - Layered products essentially comprising synthetic resin as impregnant, bonding, or embedding substance
• B44C 5/04 - Ornamental plaques, e.g. decorative panels, decorative veneers
• C03C 17/00 - Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating
• E04F 15/02 - Flooring or floor layers composed of a number of similar elements
• C04B 41/50 - Coating or impregnating with inorganic materials

Abstract

The invention relates to a method for production of tyre treads, wherein a rubber mixture in granular form mixed with particles of hard material is machined to give treads containing particles of hard material. The treads are applied to the tyre carcass and the green tyre thus obtained pressed and also profiled in a vulcanising press.

IPC Classes  ?

• B29D 30/00 - Producing pneumatic or solid tyres or parts thereof
• B29D 30/52 - Unvulcanised treads, e.g. on used tyresRetreading
• B29D 30/54 - Retreading
• B60C 11/14 - Anti-skid inserts, e.g. vulcanised into the tread band
• C08K 3/00 - Use of inorganic substances as compounding ingredients

Abstract

The present invention relates to an abrasive grain based on melted spherical corundum, the spherical corundum being clad with a relatively thick layer of fine-grained abrasive particulate solids. The cladding gives the spherical corundum properties which qualify it as abrasive grain.

IPC Classes  ?

• C09K 3/14 - Anti-slip materialsAbrasives

Abstract

The invention relates to a method for producing spherical corundum particles with a bulk density of between 1.5 kg/l and 2.5 kg/l. According to said method, between 0.1 and 1 % quartz sand is added to aluminium oxide and the mixture is fused in an electric arc furnace. The resultant melt is poured off in a quantity of less than 100 kg/min and the poured stream is blown using compressed air at a pressure of between 3 and 10 bar.

IPC Classes  ?

• C01F 7/02 - Aluminium oxideAluminium hydroxideAluminates
• C04B 35/111 - Fine ceramics

Abstract

The invention relates to a ceramic sintered body made from a-Al2O3 with a content of 95 - 100 wt. % Al2O3, a relative sintered density of = 97 % of the theoretical density and a Vickers hardness HV0-2 of = 17.5 GPa, the crystallite structure of which has a mean primary crystal size for the Al2O3 crystals of ឬ 100 nm. The invention further relates to a method for production of a sintered body with a mean primary crystal size of = 100 nm, wherein a nanocrystalline a-Al2O3 is firstly produced starting from basic aluminium chloride which is further processed to give a sintered body with a mean primary crystallite size of = 100 nm.

IPC Classes  ?

• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• C09K 3/14 - Anti-slip materialsAbrasives
• C01F 7/02 - Aluminium oxideAluminium hydroxideAluminates