Refractory product, batch for producing the product, method for producing the product, and use of the product

Abstract

The invention relates to a refractory product, a batch for producing the product, a method for producing the product, and a use of the refractory product.

Claims

1. A refractory product based on Al.sub.2O.sub.3, comprising at least one MAX phase, and containing at least one of the following phases: metallic aluminum, metallic silicon, metallic titanium, metallic iron, or at least one alloy from at least two of these metals.

2. The product according to claim 1, having a proportion of MAX phases of at least 0.5 mass %.

3. The product according to claim 1, having a proportion of Al.sub.2O.sub.3 of at least 50 mass %.

4. The product according to claim 1, containing at least one of the following phases: at least one carbide, at least one oxycarbide, at least one oxycarbonitride, or at least one SiCAlON.

5. The product according to claim 1, in which the structure is formed from a matrix of Al.sub.2O.sub.3, into which at least one MAX phase is incorporated.

6. A batch for producing a refractory product based on Al.sub.2O.sub.3 comprising at least one MAX phase, wherein the batch has the following features: the batch comprises one or more components comprising aluminum, carbon, silicon or titanium; the proportions of aluminum, carbon, silicon and titanium in the batch, which are introduced into the batch by the components, lies in the following ranges, in each case in relation to the total mass of the batch: aluminum, calculated as Al.sub.2O.sub.3: 10 to 97 mass %; carbon: 1 to 30 mass %; silicon, calculated as SiO.sub.2: 1 to 20 mass %; titanium, calculated as TiO.sub.2: 1 to 50 mass %; the batch having an aluminum-comprising component in the form of at least one of the following components: sintered corundum, fused corundum, calcined alumina, tabular alumina, or bauxite; the batch having a carbon-comprising component in the form of at least one of the following components: graphite, anthracite, petroleum coke, or carbon black; the batch having a silicon-comprising component in the form of at least one of the following components: kaolin, fireclay, at least one refractory clay, at least one raw material comprising mullite, quartzite, quartz sand, or zirconium; the batch having a titanium-comprising component in the form of rutile.

7. A method for producing a refractory product, the refractory product based on Al.sub.2O.sub.3, the refractory product comprising at least one MAX phase, the method comprising the following steps: providing a batch for producing the refractory product, wherein the batch has the following features: the batch comprises one or more components comprising aluminum, carbon, silicon or titanium; the proportions of aluminum, carbon, silicon and titanium in the batch, which are introduced into the batch by the components, lies in the following ranges, in each case in relation to the total mass of the batch: aluminum, calculated as Al.sub.2O.sub.3: 10 to 97 mass %; carbon: 1 to 30 mass %; silicon, calculated as SiO.sub.2: 1 to 20 mass %; and titanium, calculated as TiO.sub.2: 1 to 50 mass %; the batch having an aluminum-comprising component in the form of at least one of the following components: sintered corundum, fused corundum, calcined alumina, tabular alumina, or bauxite; the batch having a carbon-comprising component in the form of at least one of the following components: graphite, anthracite, petroleum coke, or carbon black; the batch having a silicon-comprising component in the form of at least one of the following components: kaolin, fireclay, at least one refractory clay, at least one raw material comprising mullite, quartzite, quartz sand, or zirconium; the batch having a titanium-comprising component in the form of rutile; applying heat to the batch; and cooling the batch applied to heat.

Description

(1) The drawings below show enlarged views of thin polished sections of the product.

(2) FIG. 1 shows a detail with an area of approximately 1.2 mm0.9 mm. The bar in the lower right-hand corner of the image corresponds to a length of 200 m. FIG. 1 shows the dark matrix 1 formed of corundum, in which the further phases, which are lighter in FIG. 1, are embedded in an island-like manner. A first island is designated in FIG. 1 by A, and a second island is designated by B.

(3) The detail designated by A in FIG. 1 is illustrated in an enlarged manner in FIG. 2. The detail in FIG. 2 corresponds to a size of approximately 130 m100 m. The white bar at the bottom of the image in the middle corresponds to a length of 10 m. What can be seen is the dark matrix 1 formed of corundum, which is characterised by reference sign 1. The light-grey MAX phase in the form of Ti.sub.3SiC.sub.2 is characterised by the reference sign 2, whereas the phase in the form of TiC, which has a darker grey compared with the MAX phase 2, is characterised by reference sign 3.

(4) A further detail from the view according to FIG. 1 is illustrated in FIG. 3. The detail corresponds to a size of approximately 65 m50 m. The white bar at the bottom of the image in the middle corresponds to a length of 10 m. What can be seen in FIG. 3 is the again dark binder matrix 1 in the form of corundum, in which island-like lighter phases are embedded. The island illustrated in FIG. 3 has a MAX phase characterised by reference sign 2 in the form of Ti.sub.3SiC.sub.2, metallic aluminium, silicon and titanium designated by reference sign 4, and also silicon carbide designated by reference sign 5. Aluminium oxycarbonitride (Al.sub.28C.sub.6N.sub.6O.sub.21) incorporated into the matrix 1 formed of corundum is characterised by reference sign 6.

(5) For use of the refractory product produced in accordance with the practical example as a raw material for the production of a refractory product, said product was granulated, i.e. processed into a granular material. For this purpose the product present as an ingot was first comminuted by the means known from the prior art into granular material and was then provided as raw material for the production of a refractory product.

(6) Since the pores of the product act as predetermined breaking points during the comminution, the density and open porosity of the granular material and of the ingot differ from one another. Here, the density of the granular material tends to be greater than the density of the ingot, and the open porosity of the granular material tends to be smaller than the open porosity of the ingot.