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Aluminum-chromium refractory material and preparation method therefor

A refractory material, aluminum chromium technology, applied in the field of refractory materials, can solve the problems of low compressive strength at room temperature, decrease in bulk density, and deterioration of physical properties, etc., to reduce porosity, good fluidity, and prevent loosening or cracking Effect

Active Publication Date: 2015-11-11
SHANDONG DADONGLIAN PETROLEUM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that in the existing process of preparing aluminum-chromium refractories, the unstable phases in the form of alkali metal oxides such as sodium and potassium in the raw materials cause the products to expand during the production process, resulting in apparent porosity Larger, lower bulk density, poorer physical properties, and low compressive strength at room temperature to provide an aluminum-chromium refractory material with high refractoriness, excellent corrosion resistance, good thermal shock resistance, and a wide sintering temperature range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An aluminum-chromium refractory material, the aluminum-chromium refractory material is composed of the following raw materials in parts by mass: 80 parts of alumina particles, 25 parts of α-alumina powder, 15 parts of nano-alumina, 20 parts of chromium oxide, and 10 parts of graphene 5 parts, 5 parts of additives, 7 parts of binder and 5 parts of nano-silicon carbide.

[0036] A method for preparing an aluminum-chrome refractory material. The raw materials are weighed according to the above proportions, and the mixed material after uniform mixing is ground with anhydrous alcohol as a medium for 10 hours, and then dried in a vacuum to obtain a powder, and the reaction powder is applied The 55,000-volt plasma arc melts the powder, and blows the melted powder into the press equipment through an inert gas to prepare shaped products of various required sizes. After drying at 120°C for 10 hours, place it at 1700°C Heat preservation for 30 minutes to prepare aluminum-chromium ...

Embodiment 2

[0039]An aluminum-chromium refractory material, the aluminum-chromium refractory material is composed of the following raw materials in parts by mass: 90 parts of alumina particles, 30 parts of α-alumina powder, 18 parts of nano-alumina, 25 parts of chromium oxide, and 15 parts of graphene 10 parts, 7 parts of additives, 10 parts of binder and 10 parts of nano-silicon carbide.

[0040] A method for preparing an aluminum-chromium refractory material. The raw materials are weighed according to the above proportions, and the mixed material after mixing is ground with anhydrous alcohol as a medium for 11 hours, and then dried in a vacuum to obtain a powder, and the reaction powder is applied The 58,000-volt plasma arc melts the powder, and blows the melted powder into the press equipment through an inert gas to prepare shaped products of various required sizes. After drying at 130°C for 11 hours, it is dried at 1750°C Heat preservation for 40 minutes to obtain aluminum-chromium re...

Embodiment 3

[0043] An aluminum-chromium refractory material, the aluminum-chromium refractory material is composed of the following raw materials in parts by mass: 100 parts of alumina particles, 35 parts of α-alumina powder, 20 parts of nano-alumina, 35 parts of chromium oxide, and 20 parts of graphene 10 parts, 10 parts of additives, 12 parts of binder and 12 parts of nano-silicon carbide.

[0044] A method for preparing an aluminum-chromium refractory material. The raw materials are weighed according to the above proportions, and the mixed material after mixing is ground with anhydrous alcohol as a medium for 12 hours, and then dried in a vacuum to obtain a powder, and the reaction powder is applied The 60,000-volt plasma arc melts the powder, blows the melted powder into the press equipment through an inert gas, and prepares shaped products of various required sizes. After drying at 150°C for 12 hours, it is dried at 1800°C The aluminum-chromium refractory material was prepared by hea...

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Abstract

The present invention relates to an aluminum-chromium refractory material and a preparation method therefor. The aluminum-chromium refractory material comprises the following raw materials in parts by mass: 80-100 parts of alumina particles, 25-35 parts of alpha-alumina powder, 15-20 parts of nano alumina, 20-35 parts of chrome oxide, 10-20 parts of graphene, 5-10 parts of an additive, 7-12 parts of a binder and 5-12 parts of nano silicon carbide. According to the refractory material provided by the invention, the inner structure is compact, and therefore volume density is increased; apparent porosity of the refractory material is reduced, and therefore expansion is prevented, thereby further improving various physical properties of the refractory material such as strength, thermal shock resistance and heat shock stability. The aluminum-chromium refractory material provided by the present invention is simple in preparation method, rich in raw materials and applicable to industrial production.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to an aluminum-chromium refractory material with high refractoriness, excellent corrosion resistance, good thermal shock resistance and wide sintering temperature range and a preparation method thereof. Background technique [0002] With the increasing shortage of energy, countries are paying more and more attention to the development, production and use of high-temperature industrial energy-saving materials. High-temperature kilns need to use a large number of refractory materials with excellent performance or special properties. Aluminum chromium refractories generally refer to chromium oxide ≤ 40% in refractory materials, and the balance is generally alumina, which has the characteristics of high refractoriness, excellent corrosion resistance, good thermal shock resistance and high wear resistance. It is widely used as the back lining of coal-water slurry pressurized gasifier,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/107C04B35/622
Inventor 佘建锋
Owner SHANDONG DADONGLIAN PETROLEUM EQUIP
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