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High-aluminum preform added with elemental silicon and subjected to nitridation firing and preparation method thereof

A technology of nitriding firing and elemental silicon is applied in the field of refractory materials, which can solve the problems of low thermal strength, high brittleness and limited application, and achieves improved thermal flexural strength, good uniformity and high thermal flexural strength. the effect of strength

Inactive Publication Date: 2013-07-24
HENAN GENGSHENG REFRACTORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The comprehensive performance of ordinary high-alumina prefabricated products is not high enough, for example: low hot strength, high brittleness, difficult to meet the use requirements, and limited application; currently ordinary high-alumina prefabricated products are mostly low and medium-grade oxide-based casting Prefabricated parts, low technical added value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: A method for preparing a high-alumina preform that is added with elemental silicon and fired by nitriding:

[0027] (a) Composition of raw materials: expressed in weight percentage, 87% of high alumina bauxite, 3% of elemental silicon, 4% of binder (hydrated alumina, calcium aluminate cement 1:1), 6% of silica fume; plus 6% of the above raw materials 0.3% by weight of dispersant (sodium tripolyphosphate);

[0028] Al in the high alumina bauxite 2 o 3 Content ≥ 75%; of which 5mm < particle size ≤ 8mm high bauxite accounted for 20%, 3mm < particle size ≤ 5mm high bauxite accounted for 12%, 1mm < particle size ≤ 3mm high bauxite accounted for 16%, 0.1mm

[0029] (b) Weighing various raw materials and dry-blending t...

Embodiment 2

[0033] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0034] Step (a) The raw materials are 81% high alumina bauxite, 9% elemental silicon, 4% binder (alumina hydrate, calcium aluminate cement 1:2) and 6% silica fume, plus 0.25% of the total weight of the above raw materials. agent (water glass);

[0035] Al in high alumina bauxite 2 o 3 Content ≥ 75%; high-bauxite with 5mm

[0036] Step (d) put the naturally cured prefab into a baking kiln for baking, the baking temperature is 100°C, and the baking time is 36 hours;

[0037] Step (e) Put it into a closed high-temperature nitriding furnace, and nitrate and burn it at 1450°C, keep it at the highest temp...

Embodiment 3

[0038] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0039] Step (a) The raw materials are 90% high alumina bauxite, 4% elemental silicon, 3% binder (alumina hydrate, calcium aluminate cement 1:1.5) and 3% silica fume, plus 0.4% of the total weight of the above raw materials. Dispersant (methyl amyl alcohol);

[0040] Al in the high alumina bauxite 2 o 3 90% high-bauxite includes: 25% high-bauxite with 5mm

[0041] The Si content in the elemental silicon is ≥ 98%, and the particle size is a mixture of 150 mesh and 200 mesh elemental silicon, and the mixing ratio of the two is 1:1;

[0042] Step (d) put the naturally cured prefab into a baking kiln for baking, the baking temperature is 120°C, and the baking time is 24 hours;

[0043]Step (e) Put it into a clo...

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Abstract

The invention relates to a high-aluminum preform added with elemental silicon and subjected to nitridation firing and a preparation method thereof. The preparation method comprises the following steps of: adding a dispersing agent into basic raw materials, namely high-aluminum bauxite, the elemental silicon and a bonding agent, uniformly dry-mixing the raw materials and the dispersing agent by using a stirring machine, adding water, and uniformly stirring; injecting into a mold, molding to obtain a preform, demolding, performing natural curing, and roasting the preform in a roasting kiln; andputting into a high temperature nitriding kiln, firing at the high temperature of between 1,350 and 1,500 DEG C in nitrogen atmosphere, and cooling to room temperature. Compared with the traditional product, the product has the advantage that: the hot strength of the product is obviously improved.

Description

technical field [0001] The invention relates to a refractory material, in particular to a prefabricated part with high thermal strength and high aluminum which is fired by adding elemental silicon and nitriding, and a preparation method thereof. Background technique [0002] At present, refractory materials are mainly made of oxide materials and carbon composite materials. Oxide-based refractory materials are usually brittle and difficult to meet the requirements of high strength and good thermal shock stability; The purpose of the brittleness of oxide refractories. However, such materials have disadvantages such as poor oxidation resistance, high thermal conductivity, and limited application range. On this basis, introducing Si into the oxide system 3 N 4 , Sialon, SiC and other non-oxide phases have 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-temperature st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 周宁生毕振勇李纪伟徐德亭彭倩张光普
Owner HENAN GENGSHENG REFRACTORIES
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