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Method for preparing beta-sialon porous material

A technology of porous materials and raw materials, applied in the preparation of refractory materials and ceramics, can solve the problems of difficult quality control, complex process, high cost, etc., and achieve the effect of light weight, simple preparation process, and alleviating the pressure of the environment.

Inactive Publication Date: 2009-06-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In order to solve the utilization of a kind of industrial solid waste discharged from the power plant and the complex processes, high cost, and difficult quality control of synthetic Sialon powder, the purpose of the invention is to use a large amount of discarded fly ash as raw material, and use aluminum powder Using silicon powder as a reducing agent, the preparation method of β-Sialon porous material with simple preparation process, low cost, high performance and high added value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The hollow fly ash microspheres (compositions shown in Table 1), metal aluminum powder, and silicon powder from the Nanyang Yahe Power Plant in Henan Province are used as raw materials, and a small amount of β-Sialon is added as seed crystals.

[0035] Table 1 The chemical composition of fly ash hollow microspheres in Nanyang Yahe Power Plant, Henan Province

[0036] ingredient SiO 2 Al 2 O 3 Fe 2 O 3 CaO MgO SO 3 R 2 O Loss Wt / % 59.88 26.75 3.60 2.98 0.87 0.48 1.13 4.16

[0037] Place 29.5% by weight of fly ash, 38.1% by weight of silicon fume, 32.4 parts by weight of aluminum powder, and 3% of β-Sialon seed crystals in a mechanical stirring device, dry and mix uniformly ; Take out the mixed powder, add 3% dextrin by weight of the mixture as a binding agent and mix it, press it into a block with a 30MPa press, and dry it at a temperature of 80-110°C.

[0038] Put the above-mentioned shaped block material into an atmosphere si...

Embodiment 2

[0042] The raw materials and formula used are the same as in Example 1.

[0043] Put the formed block into an atmosphere sintering furnace, and in a nitrogen atmosphere, heat up to 810°C at a rate of 200°C / hour for 1 hour; then continue to heat up to 1110°C at a rate of 100°C / hour for 2 hours ; Continue to heat up to 1280 ℃, the heating rate is 60 ℃ / hour, keep for 3 hours; finally, the temperature is raised to 1500 ℃, the temperature rise rate is 180 ℃ / hour, and keep for 4 hours.

[0044] The temperature of the atmosphere sintering furnace is lowered to 800°C, the nitrogen gas is turned off, and the temperature is continued to be lowered to room temperature to be taken out to obtain β-Sialon porous material.

[0045] The main crystalline phase of the product in the obtained material is β-Sialon, and the secondary crystalline phase is Al 2 O 3 .

Embodiment 3

[0047] The raw materials and formula used are the same as in Example 1.

[0048] Put the formed block into an atmosphere sintering furnace, and in a nitrogen atmosphere, heat up to 810°C at a rate of 200°C / hour for 1 hour; then continue to heat up to 1110°C at a rate of 100°C / hour for 2 hours ; Continue to heat up to 1280 ℃, the heating rate is 60 ℃ / hour, keep for 3 hours; finally, the temperature is raised to 1400 ℃, the temperature rise rate is 180 ℃ / hour, and keep for 4 hours.

[0049] The temperature of the atmosphere sintering furnace is lowered to 800°C, the nitrogen gas is turned off, and the temperature is continued to be lowered to room temperature to be taken out to obtain β-Sialon porous material.

[0050] The obtained material is analyzed by XRD, the main crystal phase of the product is β-Sialon, and the secondary crystal phase is Al 2 O 3 .

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PUM

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Abstract

This invention provides a method for preparing beta-sialon porous material. The method uses fly ashes as the raw material, and Al powder and Si powder as the reducers. Besides, a binder is also added. The method uses nitrification-reduction reaction to prepare beta-sialon porous material, and has such advantages as low cost, simple process and controllable reaction conditions, and high product purity. The beta-sialon porous material has such advantages as high conversion rate, no carbon content, good mechanical properties and good flame resistance, and can be applied in the fields of metallurgy, auto industry, military industry and ceramics.

Description

[0001] Field: [0002] The invention relates to a method for preparing ceramics and refractory materials, in particular to a method for preparing a β-Sialon hollow porous material synthesized by reduction and nitridation of fly ash hollow microspheres. Background technique: [0003] In recent years, hollow porous structural materials have attracted widespread attention from materials researchers. This is because the permeability of the spherical shell can be used to make slow-release compound fertilizers and colloidal slow-release pesticides; the unique core-shell structure can be used to make fluorescent materials, optoelectronic materials and information materials; and the loadability can be used to make Highly active catalyst carrier; use of its light weight can be used as a filler for special rubber and plastics; use of its buoyancy to make photodegradation catalysts for offshore oil spills; use of its low thermal conductivity, low heat capacity, etc. , Hollow porous can be use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/599C04B38/08C04B35/622
Inventor 张海军金乾叶方保贾全利
Owner ZHENGZHOU UNIV