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Mullite aluminum nitride prefabricated brick formed by nitriding sintering

A nitriding sintering and aluminum nitride technology, applied in the field of refractory materials, can solve the problems of poor oxidation resistance, high brittleness and high thermal conductivity, achieve high-temperature flexural strength, good uniformity, and improve thermal resistance. The effect of folding strength

Inactive Publication Date: 2013-04-17
山国强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxide-based refractories are usually brittle and difficult to meet the requirements of high strength and good thermal shock stability at the same time; carbon composite refractories introduce carbonaceous components such as graphite, although the brittleness of oxide refractories is improved, However, such materials have disadvantages such as poor oxidation resistance and high thermal conductivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: A kind of mullite aluminum nitride prefabricated brick of firing by nitriding:

[0023] (1) Composition of raw materials: expressed in weight percentage, mullite 60%, aluminum nitride 10%, metal silicon powder 18%, silica fume 2%; metal aluminum powder 6%, aluminate cement 4%, and accounted for the above 0.08% admixture of the total weight of raw materials. (2) Weigh various raw materials and dry mix them evenly with a mixer to obtain a dry mixed material; (3) add an appropriate amount of water to the dry mixed material, control the moisture content of the mixture to 4.0% after adding water, stir evenly, and then inject In the mould, the vibrating rod is vibrated to form, and the prefabricated part is obtained after forming; (4) The obtained prefabricated brick is cured in the mold at room temperature of 20°C for 1 day, then demoulded, and then naturally cured at room temperature of 20°C for 1 day day, put the prefabricated bricks after natural curing int...

Embodiment 2

[0024] Embodiment 2: basically the same as embodiment 1, the difference is:

[0025] (1) Raw material composition: expressed in weight percentage, mullite 62%, aluminum nitride 15%, metal silicon powder 10%, silica fume 3%; metal aluminum powder 5%, aluminate cement 5%, and accounted for the above 0.06% admixture of the total weight of raw materials. (2) Weigh various raw materials and dry-mix them evenly with a mixer to obtain dry-blended materials; (3) Add an appropriate amount of water to the dry-blended materials, and after adding water, control the moisture content of the mixture to 4.5%, stir evenly, and then inject In the mould, the vibrating rod is vibrated to form, and the prefabricated part is obtained after forming; (4) The obtained prefabricated brick is cured in the mold at room temperature of 20°C for 1 day, then demoulded, and then naturally cured at room temperature of 20°C for 1 day day, put the prefabricated bricks after natural curing into a drying kiln and...

Embodiment 3

[0026] Embodiment 3: basically the same as embodiment 1, the difference is:

[0027] (1) Composition of raw materials: expressed in weight percentage, mullite 65%, aluminum nitride 11%, metal silicon powder 11%, silica fume 4%; metal aluminum powder 3%, aluminate cement 6%, and accounted for the above 0.08% admixture of the total weight of raw materials. (2) Weigh various raw materials and dry-mix them evenly with a mixer to obtain dry-blended materials; (3) Add an appropriate amount of water to the dry-mixed materials, and control the moisture content of the mixture to 5.5% after adding water, stir evenly, and then inject In the mould, the vibrating rod is vibrated to form, and the prefabricated part is obtained after forming; (4) The obtained prefabricated brick is cured in the mold at room temperature of 20°C for 1 day, then demoulded, and then naturally cured at room temperature of 20°C for 1 day day, put the naturally cured prefabricated bricks into a drying kiln for bak...

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Abstract

The invention relates to a mullite aluminum nitride prefabricated brick formed by nitriding sintering. The mullite aluminum nitride prefabricated brick is prepared by the following steps of: adding an additive into mullite, aluminium nitride, silicon metal, aluminium metal, silica powder and aluminate cement serving as basic raw materials; uniformly mixing various raw materials and dispersing agents in a dried mode by using a stirring machine; adding water into the uniformly-mixed materials and stirring uniformly; injecting the mixed materials into a mould to be molded to form a prefabricated piece; roasting the prefabricated piece which is demoulded and naturally cured into a roasting kiln to roast; and finally putting the prefabricated piece into a high-temperature nitriding kiln at the high temperature of 1400-1500 DEG C under a nitrogen atmosphere to sinter; and after sintering the prefabricated piece, and cooling to the room temperature to obtain the prefabricated brick. Compared with the traditional product, the heat-state intensity of product disclosed by the invention is obviously improved and whole performance of the product disclosed by the invention is good.

Description

technical field [0001] The invention relates to a refractory material, in particular to a mullite aluminum nitride prefabricated brick with high hot state strength fired by nitriding. Background technique [0002] At present, refractory materials are mainly made of oxide materials and carbon composite materials. Oxide-based refractories are usually brittle and difficult to meet the requirements of high strength and good thermal shock stability at the same time; carbon composite refractories introduce carbonaceous components such as graphite, although the brittleness of oxide refractories is improved, However, such materials have disadvantages such as poor oxidation resistance and high thermal conductivity. Therefore, the introduction of non-oxide phases such as nitride, Sialon, and SiC into the oxide system has become a new research hotspot in the field of refractory materials. [0003] Many studies have shown that oxide-non-oxide composite materials have high high-temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/185C04B35/622
Inventor 山国强
Owner 山国强
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