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Method for preparing SiC/Mullite composite sphere

A technology of spheres and mixtures, which is applied in the field of non-metallic materials, can solve the problems of no open invention patents for SiC/Mullite composite spheres, and achieve the effect of low raw material cost and simple preparation process

Inactive Publication Date: 2011-10-05
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, no published invention patents on the preparation of SiC / Mullite composite spheres have been retrieved

Method used

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  • Method for preparing SiC/Mullite composite sphere
  • Method for preparing SiC/Mullite composite sphere
  • Method for preparing SiC/Mullite composite sphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Raw materials: Fly ash microbeads with a particle size range of 43-150um in Henan Yuzhou Power Plant (the composition is shown in Table 1), carbon black.

[0024] Table 1 Chemical composition of fly ash microbeads in Henan Yuzhou Power Plant

[0025]

[0026] The fly ash microbeads and carbon black were evenly mixed in a mass ratio of 100:40, placed in an alumina crucible, and carried out carbothermal reduction reaction in a MW-L0316V microwave high-temperature sintering furnace. Under an argon atmosphere with a flow rate of 0.5-1L / min (Ar purity > 99.999%), keep the argon pressure in the furnace at 0.1005Mpa, raise the temperature to 1200°C at a heating rate of 10°C / min, keep the temperature constant for 1h, and cool naturally to room temperature , to obtain powder; heat the powder in an oxidation furnace at 700° C. for 4 to 5 hours to remove residual carbon, and obtain the SiC / Mullite composite sphere of the present invention. its description see figure 2 and ...

Embodiment 2

[0028] Raw material: with the raw material in embodiment 1, replace carbon black with gac, all the other remain unchanged.

[0029] The fly ash microbeads and activated carbon were evenly mixed in a mass ratio of 100:40, placed in an alumina crucible, and carried out carbothermal reduction reaction in a MW-L0316V microwave high-temperature sintering furnace. Under an argon atmosphere with a flow rate of 0.5-1L / min (Ar purity > 99.999%), keep the argon pressure in the furnace at 0.1005Mpa, raise the temperature to 1300°C at a heating rate of 10°C / min, keep the temperature constant for 1h, and cool naturally to room temperature , get powder.

[0030] Heat the powder in an oxidation furnace at 700°C for 4 to 5 hours to remove residual carbon, and obtain the SiC / Mullite composite sphere of the present invention. its description see Figure 4 and Figure 5 .

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Abstract

The present invention discloses a method for preparing SiC / Mullite composite sphere. The method uses the flyash micro-beads as a principle raw material and comprises the following steps: mixing the flyash micro-beads and carbon powder with a mass ratio of 100: 30-40 to uniform, increasing the temperature to 1100-1400 DEG C with a temperature rising speed of 10 DEG C / min under the circulating argonwith the flow of 0.5-1L / min for executing the microwave carbon thermal reduction, after keeping the temperature for 0.5-2 h, naturally cooling to the room temperature for obtaining the powder material; and calcining the powder under 600-800 DEG C for eliminating the residual carbon, and namely the SiC / Mullite composite sphere of the invention is obtained. The method of the invention not only facilitates the environment protection, but also has the excellent performances of low cost of raw material and simple preparing technique. The obtained SiC / Mullite composite sphere has a hollow structureand has the excellent performances of wear resistance, high temperature resistance, etc. of SiC and Mullite, and simultaneously has the characteristics of low density, light weight, etc.

Description

technical field [0001] The invention relates to a preparation technology of inorganic non-metallic materials, in particular to a method for preparing SiC / Mullite composite spheres through a microwave carbothermal reduction process using fly ash microbeads as the main raw material, belonging to the field of non-metallic materials. Background technique [0002] Silicon carbide (SiC), mullite (Mullite) and their composite materials have high strength at room temperature and high temperature, high thermal conductivity, small thermal expansion coefficient, good thermal shock resistance, excellent high temperature wear resistance, strong chemical corrosion resistance, etc. With a series of excellent properties, it has broad application prospects in industrial fields such as iron and steel, nonferrous metallurgy, chemistry, electric power, ceramics and aerospace. [0003] The Chinese invention patent application with the publication number CN1696075 provides a method for sintering ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/185C04B35/565B09B3/00
Inventor 杨久俊王雪平张磊
Owner TIANJIN URBAN CONSTR COLLEGE