Method for preparing Sialon hollow ball

A technology of hollow balls and sialon, applied in the field of materials, can solve the problems of not being effectively used, and achieve the effect of abundant raw materials, low cost of raw materials, and low price

Inactive Publication Date: 2007-12-26
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Fly ash can be used as a cheap raw material for synthesizing Sialon, however, a large number of spherical particle materials with multiple functions in fly ash—microbeads have not been effectively utilized

Method used

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  • Method for preparing Sialon hollow ball

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, Henan Fengyuan Industrial Co., Ltd. > 77 μm fly ash microbeads are used, and its main chemical composition is as follows:

[0023] Al 2 o 3

SiO 2

Fe 2 o 3

CaO

MgO

Duck River Microbeads

28.76％

60.80％

2.30％

2.20％

0.91％

[0024] (1) Select Fengyuan Industrial fly ash hollow microspheres (particle size > 77 μm) as raw material, mix the fly ash hollow microspheres with carbon powder (activated carbon or carbon black) in a weight ratio of 74:26, sieve;

[0025] (2) When the flow rate is 0.05-0.2L / min high-purity nitrogen (N 2 >99.999%) atmosphere, heat up to 1500°C, keep warm for 6 hours, and cool with the furnace to obtain powder;

[0026] (3) Heat the prepared powder in an oxidation furnace at 800° C. for 4-5 hours to remove residual carbon to obtain β-sialon hollow spheres.

Embodiment 2

[0028] Henan Yuzhou Power Plant > 43μm fly ash microbeads are used, and its main chemical composition is as follows:

[0029] al 2 o 3

SiO 2

Fe 2 o 3

CaO

MgO

Yuzhou Microbeads

26.61％

58.47％

4.45％

4.40％

1.28％

[0030] (1) Select Henan Yuzhou Power Plant > 43 μm as raw material, mix fly ash hollow microspheres and carbon powder (activated carbon or carbon black) in a ratio of 74:26 (100 parts in total), and sieve;

[0031] (2) When the flow rate is 0.05-0.2L / min high-purity nitrogen (N 2 >99.999%) atmosphere, heat up to 1450°C, keep warm for 6 hours, and cool with the furnace to obtain powder;

[0032] (3) Heat the prepared powder in an oxidation furnace at 800° C. for 4 to 5 hours to remove residual carbon, and then obtain hollow spheres whose main components are 0′-sialon and β-sialon.

[0033] It can be seen from Fig. 1 that the surface of the sialon spheres formed after carbothermal reduction and ...

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Abstract

This invention relates to a method for preparing hollow sialon spheres. The method comprises: (1) uniformly mixing hollow fly ash microbeads and carbon powder at a wt. ratio of (68-74):(32-36), and sieving; (2) heating at a rate of 0-300 deg.C/h in high-purity nitrogen atmosphere (flow rate = 0.05-0.2 L/min), 5 deg.C/min within 300-1000 deg.C, 3 deg.C/min within 1000-1300 deg.C, and 2 deg.C/min within 1300-1500 deg.C, keeping the temperature for 4-6 h, and cooling to obtain powder; (3) keeping the powder in a 750-850 deg.C oxidation furnace for 4-5 to remove residual carbon and obtain hollow sialon spheres. The hollow sialon spheres have purity of 90 plus and minus 5%, and particle sizes larger than 43 mu.m. The method has such advantages as no need for auxiliary materials, no need for acid washing, simple process, abundant raw materials, and low cost.

Description

technical field [0001] The invention relates to a preparation method of sialon hollow spheres, belonging to the field of material technology. Background technique [0002] At present, as a new type of engineering material, sialon has emerged in metallurgy, aviation, chemical industry, machinery and other industrial sectors: such as automotive engine components, metal cutting tools, various wear-resistant high-temperature parts and extrusion dies, high-temperature seals and Bearings etc. [0003] In the research on the synthesis of Sialon powder from industrial waste residues, most of them use coal gangue or fly ash to synthesize β-Sialon. The basic method and principle are: mix coal gangue and reducing agent in a certain proportion to achieve close mixing state, adding a certain catalyst, after granulation and molding, reduction and nitriding are carried out in a high-temperature furnace with a nitrogen atmosphere at a certain flow rate, and the desired product is synthesiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/599C04B35/622
Inventor 杨久俊张磊
Owner ZHENGZHOU UNIV
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