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Preparation for producing refractory materials

A technology of refractory materials and products, applied in the direction of nanotechnology for materials and surface science, ceramic material production, nanotechnology, etc., can solve corrosion resistance and thermomechanical performance degradation, mechanical strength reduction, corrosion resistance of refractory materials and degradation of thermomechanical properties

Active Publication Date: 2013-05-29
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, degradation of refractory corrosion resistance and thermomechanical properties also occurs
[0011] In the case of hydraulic binders such as cements, especially refractory cements based on calcium aluminate and hydrated alumina, a disadvantage is that they decompose in the range <1000 °C, which leads to a considerable reduction in mechanical strength (occurring strength gap)
The introduction of impurity CaO in the material microstructure leads to the degradation of corrosion resistance and thermomechanical properties

Method used

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  • Preparation for producing refractory materials
  • Preparation for producing refractory materials
  • Preparation for producing refractory materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Embodiment 1: the comparison of product solidification time and strength

[0116] Make it contain sintered-alumina T60 0.2-0.6mm (50% by weight), sinter-alumina T600-0.3mm (20% by weight), sinter-alumina T60 0-0.045mm (10% by weight) and calcined oxide A granular component of Aluminum CTC 50 (20% by weight) (based in each case on the total granular component) was mixed with 5% by weight (based on the total granular component) of Dispersions 1-3 and make-up water to obtain the present Invented products.

[0117] The compounding ratio in this example was calculated so that the proportions of the particle components amounted to 100. The proportion of other raw materials in the product is based on the 100% value of the granular component.

[0118] Furthermore, in each case (except the case of Dispersion 1), 1% by weight of plasticizer was added to reduce the required amount of make-up water. Dispersion 1 itself has very good fluidization properties. The required amoun...

Embodiment 2

[0123] Example 2: Effect of the amount of alumina on the strength of refractory concrete

[0124] A product having the same granular composition as in Example 1 was prepared for this experiment. Dispersion 1 was used as a binder. The dispersions were added in amounts of 2%, 3% and 5% by weight, based on the granular component. To control the coagulation process, 2% by weight of MgO fine powder (caustic magnesia) was added, based on the granular component. The required amount of make-up water was essentially the same in all preparations, approximately 10% by weight.

[0125] The molded articles were dried as described in Example 1. In each case, a part of the dried samples was continuously fired at 700° C. and 1500° C. for 2 hours.

[0126] The CCS determination was carried out on the dried and calcined samples. The measured CCS values ​​are shown in Table 3.

[0127] As the firing temperature increases, the strength increases accordingly. higher Al 2 o 3 content wil...

Embodiment 3

[0128] Embodiment 3: the influence of the amount of magnesium oxide on the strength of refractory concrete

[0129] A product having the same granular composition as in Example 1 was prepared for this experiment. Dispersion 1 was used as binder. The added amount thereof is 3% by weight.

[0130] To control the coagulation process, 1% and 2% by weight of MgO fines (caustic magnesia) were used. The required amount of make-up water was essentially the same in both mixtures, approximately 10% by weight.

[0131] Drying and subsequent firing of the molded articles was carried out as described in Example 2. The measured CCS values ​​are shown in Table 4.

[0132] The results obtained indicate that higher caustic magnesia additions have no substantial effect on the strength of dispersion 1-bound refractory concrete in the low firing temperature range. Higher MgO content can improve the strength of the material after firing at 1500 °C.

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Abstract

Preparation for producing refractory materials, characterized in that it comprises one or more particulate, refractory components and one or more binders, where—the particulate, refractory component has a mean particle diameter of >0.3 m and—the binder is selected from among—from 0.05 to 50% by weight of a very finely particulate binder having a mean particle diameter of from 10 nm to 0.3 m selected from the group consisting of aluminum oxide, titanium dioxide, zirconium dioxide and / or mixed oxides of the abovementioned oxides, —from 0 to 20% by weight of an inorganic binder, from 0 to 20% by weight of a hydraulically setting binder, —from 0 to 15% by weight of an organic, silicon-free binder—and the preparation additionally contains from 0 to 35% by weight of water, where—the proportion of the particulate, refractory component is equal to 100 and the percentages of the further materials in the preparation are based on the particulate component.

Description

technical field [0001] The invention relates to an article for the production of refractory materials and its products. The invention further relates to the green body obtained by this article. The invention further relates to a method of making a refractory material using the article or green body. Background technique [0002] Refractories are ceramic products that are used to protect against high temperatures in various factories. The main service targets of refractory materials are steel, glass, cement and non-ferrous metal industries. According to the product and the process used, refractories can be divided into shaped and unshaped products. [0003] For the production of shaped products such as bricks, raw materials with different particle sizes are processed to produce an extruded composition, which is extruded axially or isostatically, sometimes at a suitable extrusion Extruded in a die under very high extrusion pressure. Subsequently, the finished compact is p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K21/02C04B35/04C04B35/10C04B35/443C04B35/66
CPCC04B35/6263C04B2235/5445C04B2235/5409C04B35/101C04B2235/3206C04B35/6303C04B2235/3232C04B2235/3217C04B35/66C04B2235/5472C04B2235/5454C04B2235/96C04B35/62665C04B35/0435B82Y30/00C04B2235/3244C04B35/04C04B35/10C04B35/443
Inventor T·冯里蒙利平斯基C·托恩特拉普W·洛茨C·巴茨-佐恩
Owner EVONIK OPERATIONS GMBH
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