Method for preparing MgAION/SiAION ceramic composite material by utilizing lagonite milltailings

A technology of ceramic composite materials and boronite, which is applied in the field of materials, can solve the problems of complex synthesis process and high cost of raw materials, and achieve the effect of simple process, low cost of raw materials and low wettability

Inactive Publication Date: 2013-04-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both MgAlON and SiAlON can exist stably at room temperature to high temperature. The synthesis of both requires higher temperature and similar atmosphere conditions. Through material composition design, magnesium aron / sialon composite materials are currently synthesized using magnesium alon and sialon materials. The method of direct compounding of Arlon materials has high cost of raw materials and complex synthesis process

Method used

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  • Method for preparing MgAION/SiAION ceramic composite material by utilizing lagonite milltailings
  • Method for preparing MgAION/SiAION ceramic composite material by utilizing lagonite milltailings
  • Method for preparing MgAION/SiAION ceramic composite material by utilizing lagonite milltailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Grinding the boron ore beneficiation tailings, and sieving through a 200-mesh sieve to obtain tailings powder below 200 mesh;

[0041] Tailings powder, bauxite and carbon black are mixed to form a mixed material, and the ingredients in the mixed material are 14.25% of tailings powder, 69.13% of bauxite and 16.62% of carbon black by weight percentage;

[0042] Add absolute ethanol to the mixed material and put it in a ball mill for wet mixing for 24 hours to make a mixed slurry. The amount of absolute ethanol is based on the submerged mixed powder;

[0043] Remove ethanol from the mixed slurry at 60°C, then place it in a ball mill for dry mixing for 5 hours, then put it into a steel mold, press uniaxially under a pressure of 30MPa, hold the pressure for 1 minute, and obtain a green body;

[0044] The primary green body is placed in a sintering furnace for a normal-pressure sintering process. The normal-pressure sintering process is heated to 1550 °C at a rate of 3-5 °C / s...

Embodiment 2

[0050] Grinding the boron ore beneficiation tailings, and sieving through a 200-mesh sieve to obtain tailings powder below 200 mesh;

[0051] Tailings powder, bauxite and carbon black are mixed to form a mixed material, and the ingredients in the mixed material are 25.25% of tailings powder, 62.95% of bauxite and 11.80% of carbon black by weight percentage;

[0052] Add absolute ethanol to the mixed material and put it in a ball mill for wet mixing for 22 hours to make a mixed slurry. The amount of absolute ethanol is based on the submerged mixed powder;

[0053] Dry the mixed slurry at 70°C to remove ethanol, then place it in a ball mill for dry mixing for 4 hours, then put it into a steel mold, and press it under the condition of 40MPa in uniaxial direction, and hold the pressure for 2 minutes to obtain a green body;

[0054] The primary green body is placed in a sintering furnace for a normal pressure sintering process. The normal pressure sintering process is heated to 150...

Embodiment 3

[0060] Grinding the boron ore beneficiation tailings, and sieving through a 200-mesh sieve to obtain tailings powder below 200 mesh;

[0061] Tailings powder, bauxite and carbon black are mixed to form a mixed material, and the ingredients in the mixed material are 30.23% of tailings powder, 52.23% of bauxite, and 17.54% of carbon black by weight percentage;

[0062] Add absolute ethanol to the mixed material and put it into a ball mill for wet mixing for 20 hours to make a mixed slurry. The amount of absolute ethanol is based on the submerged mixed powder;

[0063] Dry the mixed slurry at 80°C to remove ethanol, then place it in a ball mill for dry mixing for 3 hours, then put it into a steel mold, press uniaxially under the condition of a pressure of 50MPa, hold the pressure for 1 minute, and obtain a green body;

[0064] The primary green body is placed in a sintering furnace for a normal pressure sintering process. The normal pressure sintering process is heated to 1450 °C...

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Abstract

The invention relates to a method for preparing an MgAION / SiAION ceramic composite material by utilizing lagonite milltailings, belonging to the technical field of materials, and comprising the following steps: milling the lagonite milltailings to obtain tailings powder; mixing the tailings powder, bauxite and carbon black to produce a mixed material; baking after moistening, then conducting dry mixing and pressing to produce primary green body; conducting primary constant-pressure sintering under the condition of nitrogen protection; heating and preserving heat to obtain carbon-removed powder, mixing with an additive and conducting compression moulding; and covering with nitride mixed powder, and conducting secondary constant-pressure sintering. Raw material adopted by the method has lowcost, the process is simple, and the prepared MgAION / SiAION ceramic composite material has the characteristics of good creep resistance and thermal shock resistance and excellent high-temperature mechanical performance.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a method for preparing magnesium aron / sialon ceramic composite material by using boron ore beneficiation tailings. Background technique [0002] MgAlON (magnesium Alon) material has excellent optical, mechanical, and dielectric properties, good high-temperature thermal stability, good resistance to slag erosion, but relatively poor thermal shock resistance; SiAlON (Sai ​​Alon) material has high-temperature mechanical properties Excellent, small thermal expansion coefficient, good thermal shock resistance, and high toughness; MgAlON and SiAlON materials can be combined to form a composite material, which can be used to obtain magnesium alon / sialon composite materials with good comprehensive performance through complementary advantages. Both MgAlON and SiAlON can exist stably at room temperature to high temperature. The synthesis of both requires higher temperature an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/599C04B35/58C04B35/622
Inventor 薛向欣姜涛唐义段培宁
Owner NORTHEASTERN UNIV LIAONING
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