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Method for producing silicon oxynitride and andalusite composite modified aluminum magnesia carbon brick

An aluminum-magnesium-carbon brick and composite modification technology, which is applied in the field of materials, can solve problems such as brick body cracking, and achieve the effects of low creep rate, improved structure, and improved thermal shock resistance stability.

Inactive Publication Date: 2018-02-09
MAANSHAN BAOLONG NEW BUILDING MATERIALS
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  • Abstract
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  • Application Information

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Problems solved by technology

Although traditional simple antioxidants are cheap, there are many problems, such as the hydration reaction that easily occurs when the temperature rises from high temperature to room temperature, resulting in cracking of the brick body

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0017] Si in this example 2 N 2 Alumina-magnesia-carbon bricks compositely modified by O and andalusite, which are prepared by the following steps:

[0018] (1) Mix elemental silicon and silicon dioxide at a mass ratio of 3:1 and add them to a vibrating ball mill tank for mixed ball milling. After ball milling for 3 hours, a powder with an average particle size of 8um is obtained; the powder is pressed and formed on a hydraulic press at a pressure of 40MPa, prepared into a Φ36mm×30mm cylindrical sample; put the cylindrical sample in a graphite crucible with graphite paper, put it in a high-temperature nitrogen furnace, and raise the temperature to 900°C at a heating rate of 10°C / min, and then Raise the temperature to 1600°C at a heating rate of 6°C / min, keep it warm for 2 hours, cool down to room temperature naturally, crush and grind until the particle size is less than 0.074mm, and obtain Si 2 N 2 O;

[0019] (2) Remove iron from andalusite by magnetic separation, and th...

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Abstract

The invention discloses a method for producing silicon oxynitride and andalusite composite modified aluminum magnesia carbon bricks. The method is characterized by comprising the following steps: firstly, performing a high temperature reaction on monatomic silicon and silicon dioxide in the presence of a nitrogen atmosphere so as to prepare Si2N2O; secondly, performing magnetic separation iron removal on the andalusite, and co-grinding with white mud so as to obtain a mixed powder material; by taking fused magnesite as a raw material, Si2N2O as an antioxidant and a phenolic resin as a combining agent, performing material mixing; finally performing ageing mixing, pressurizing molding, drying and high temperature carbon burying thermal treatment on mixed materials so as to obtain a mixed powder material as a modifier, and performing intermittent high temperature heat-preservation and cold air cooling, thereby the silicon oxynitride and andalusite composite modified aluminum magnesia carbon bricks. The aluminum magnesia carbon bricks produced by using the invention are low in creep rate, good in thermal shock resistance, high in pressure resistance strength, low in porosity and good in molten steel corrosion resistance.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a Si 2 N 2 A production method of alumina-magnesia-carbon bricks compounded and modified by O and andalusite. Background technique [0002] Magnesia carbon brick is an excellent refractory material, but it has the disadvantage of being easily oxidized. In magnesia carbon bricks, graphite and residual carbon in the binder are the main oxidizing components, which can be oxidized by direct and indirect methods. The way to solve the oxidation problem is to add antioxidants to refractory materials. Although the traditional simple antioxidants are cheap, there are many problems, such as hydration reaction easily occurs when the temperature rises from high temperature to room temperature, resulting in cracking of bricks. Contents of the invention [0003] The object of the present invention is to provide a Si that is not prone to hydration reaction. 2 N 2 A production method of alumina-...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/626C04B35/634C04B35/64
CPCC04B35/043C04B35/62605C04B35/6261C04B35/6265C04B35/63476C04B35/64C04B2235/3217C04B2235/3463C04B2235/349C04B2235/3873C04B2235/6587C04B2235/9676
Inventor 晋元龙陈德全
Owner MAANSHAN BAOLONG NEW BUILDING MATERIALS
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