A preparation method of in-situ composite aluminum-carbon refractory material containing titanium nitride

An aluminum-carbon refractory, in-situ composite technology, applied in the field of refractory preparation, can solve the problems of high requirements for equipment conditions, high reaction temperature, high cost, etc., and achieves low requirements for reaction conditions, good anti-oxidation performance, and reduced powder the effect of

Active Publication Date: 2016-01-13
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Abstract
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Problems solved by technology

In order to obtain high-quality titanium nitride powder, direct nitriding of titanium hydride or titanium powder is often used at home and abroad, but this process is prone to powder sintering, resulting in losses
Other methods also have shortcomings such as high reaction temperature, long time, high requirements for conditions and equipment, and high cost, and the current heat treatment process of aluminum-carbon refractories cannot meet the above-mentioned preparation requirements.

Method used

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  • A preparation method of in-situ composite aluminum-carbon refractory material containing titanium nitride
  • A preparation method of in-situ composite aluminum-carbon refractory material containing titanium nitride

Examples

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Comparison scheme
Effect test

Embodiment 1

[0015] Preparation of aluminum / titanium oxide composite powder: 1) Preparation of slurry: Put 166.7 grams of acrylamide and 55.5 grams of methylenebisacrylamide into a beaker containing 1110 grams of alcohol to obtain a premix solution, and pour it into a ball mill tank; Weigh 611 grams of metal aluminum powder (325 mesh), 1389 grams of nano-titanium oxide, use alumina balls as grinding balls, and mill them for 20 hours to make a slurry. 2) Forming and drying: Add 1.7 grams of initiator ammonium persulfate and 0.8 grams of catalyst tetramethylethylenediamine to the slurry in step 1 respectively. Inject into the forming mold, and gel curing and molding at 30°C and 80%RH humidity. After solidification, remove the mold to obtain the green body, put the green body in a constant temperature and humidity box, keep the temperature at 25°C and dry at a humidity of 90%, and then crush the green body to obtain titanium oxide with a particle size of >325 mesh and <50 mesh Wrap metal alu...

Embodiment 2

[0018] Preparation of aluminum / titanium oxide composite powder: 1) Preparation of slurry: put 187 grams of acrylamide and 54.5 grams of methylenebisacrylamide into a beaker containing 1100 grams of alcohol to obtain a premix solution, and pour it into a ball mill tank; Weigh 500 grams of metal aluminum powder (325 mesh), 1500 grams of nano-titanium oxide, and use alumina balls as grinding balls. After ball milling for 20 hours, a slurry is made. 2) Forming and drying: 3.7 grams of initiator ammonium persulfate and 1.8 grams of catalyst tetramethylethylenediamine were added to the slurry in step 1 respectively. Inject into the forming mold, and gel curing and molding at 30°C and 80%RH humidity. After solidification, remove the mold to obtain the green body, put the green body in a constant temperature and humidity box, keep the temperature at 25°C and dry at a humidity of 90%, and then crush the green body to obtain titanium oxide with a particle size of >325 mesh and <50 mesh ...

Embodiment 3

[0021] Preparation of aluminum / titanium oxide composite powder: 1) Preparation of slurry: Put 216 grams of acrylamide and 32.5 grams of methylenebisacrylamide into a beaker containing 1084 grams of alcohol to obtain a premix solution, and pour it into a ball mill tank; Weigh 333 grams of metal aluminum powder (325 mesh), 1677 grams of nano-titanium oxide, and use alumina balls as grinding balls. After ball milling for 20 hours, a slurry is made. 2) Forming and drying: 6.48 grams of initiator ammonium persulfate and 4.3 grams of catalyst tetramethylethylenediamine were added to the slurry in step 1 respectively. Inject into the forming mold, and gel curing and molding at 30°C and 80%RH humidity. After solidification, take off the mold to obtain the green body, put the green body in a constant temperature and humidity box, keep the temperature at 25°C and dry at a humidity of 90%, and then crush the green body to obtain a composite powder with a particle size of >325 mesh and <5...

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Abstract

The invention belongs to the technical field of preparation of refractory materials and mainly relates to a preparation method of a titanium nitride-containing in-situ composite aluminum-carbon refractory material. The preparation method is characterized by comprising the following steps: preparing composite powder of metallic aluminum and titanium dioxide by means of a gelcasting method, wherein the composite powder is a precursor, and the precursor is mainly characterized in that metallic aluminum powder is coated with titanium dioxide; introducing the precursor which is 1-4wt% of the total weight of main raw materials aluminum oxide and graphite for preparing the aluminum-carbon refractory material into the raw materials of the aluminum-carbon refractory material and mixing together to obtain a blank; carrying out isostatic press moulding on the blank to obtain a aluminum-carbon refractory material green body; carrying out the heat treatment process in a protective gas, wherein the reaction 4Al+3TiO2+N2=2Al2O3+Ti3N4 is carried out in the heat treatment process, aluminothermic reaction is facilitated since metallic aluminum powder is coated with titanium dioxide, and meanwhile generation of aluminum carbide is greatly reduced and pulverization of powder is greatly reduced, and the reaction generates two ceramic combination phases Al2O3 and Ti3N4; and finally forming the titanium-containing nitride in-situ composite aluminum-carbon refractory material.

Description

technical field [0001] The invention belongs to the technical field of preparation of refractory materials, and mainly relates to a method for preparing a titanium nitride-containing in-situ composite aluminum-carbon refractory material. Background technique [0002] Aluminum carbon refractories are based on Al 2 o 3 It is a carbon bonded refractory material made of graphite as the main raw material and organic matter such as phenolic resin as the binder. Thanks Al 2 o 3 It has the characteristics of high melting point and high resistance to molten steel erosion, while graphite has the characteristics of low thermal expansion, high thermal conductivity, and high resistance to slag erosion, so this material has excellent thermal shock resistance and erosion resistance, and The cost of raw materials is not high, and it is widely used in the continuous casting process, such as continuous casting of three major parts, but the fatal disadvantage of aluminum-carbon refractorie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 钱凡马渭奎刘国齐杨文刚于建宾马天飞
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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