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Method for synthesizing ferro-silicon nitride by microwave

A technology of microwave synthesis and ferrosilicon nitride, applied in the direction of nitrogen-metal/silicon/boron binary compounds, etc., to achieve the effects of long synthesis time, short synthesis time and low synthesis temperature

Inactive Publication Date: 2006-05-24
长沙隆泰科技有限公司
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AI Technical Summary

Problems solved by technology

Simultaneously, the present invention overcomes the problem that more diluents and crystal seeds need to be added in the conventional method by improving the process, and improves the efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1, using 100kg 75# ferrosilicon ore (FeSi75) as raw material, made into powder by conventional method, sieved, particle size 0.05mm, added 5kg of ammonium bicarbonate additive, mixed evenly, placed in microwave synthesis reaction chamber for microwave Synthetic, microwave frequency is 2450MHz. Nitrogen gas is introduced, the pressure is 0.12MPa, the synthesis temperature is 1250°C, the synthesis time is controlled at 2 hours, and the obtained composition is cooled to obtain the finished product of ferrosilicon nitride. It was determined that the obtained ferrosilicon nitride contained 26.41% nitrogen, and the XRD analysis result was α-Si 3 N 4 , β-Si 3 N 4 , FeSi.

Embodiment 2

[0009] Example 2, using 20t75# ferrosilicon ore (FeSi75) as raw material, made into powder by conventional methods, passed through a sieve, the particle size is 0.074mm, added 1t of ammonium bicarbonate additive, mixed evenly, placed in the microwave synthesis reaction chamber for microwave synthesis , The microwave frequency is 2450MHz. Nitrogen gas is introduced, the pressure is 0.12MPa, the synthesis temperature is 1250°C, the synthesis time is controlled at 2 hours, and the obtained composition is cooled to obtain the finished product of ferrosilicon nitride. It was determined that the obtained ferrosilicon nitride contained 31.05% nitrogen, and the XRD analysis result was α-Si 3 N 4 , β-Si 3 N 4 , Fe 2 Si.

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Abstract

The invention provides silicon iron nitride microwave-synthesizing method, using silicon iron as raw material for microwave synthesis, grinding silicon iron ore into powder with particle size smaller than 0.5mm, placing the silicon iron powder into a microwave synthesis reaction cavity, adding ammonium-containing additive by 5% of the raw material, uniformly mixing, where microwave frequency is 300MHz-300GHz, pressure is 0.1-0.12MPa and synthesis temperature is 800-1800 deg.C, inputting nitrogen gas for microwave synthesis for 0.5-3 hours, and cooling the synthetic to obtain the finished product silicon iron nitride. The invention couples special wave band of the microwave with basic structure of the material to produce heat to heat in a mode of heating the material by its medium loss, and has the advantages of low synthesis temperature, short synthesis time, low energy consumption, etc.

Description

technical field [0001] The invention relates to a preparation method of an inorganic non-metal material ferrosilicon nitride. Background technique [0002] Ferrosilicon nitride (Fe-Si 3 N 4 The main substance in ) is silicon nitride, which can improve the thermal strength and oxidation resistance of silicon carbide refractories as a structural material and anti-oxidation material. Mixed with other materials, it can produce refractory materials with excellent resistance to molten metal. If it is used as a coating, it can make the surface of the casting bright and clean, and prolong the service life. Due to the high nitrogen content of ferrosilicon nitride, it can also be the preferred additive for various nitrogen-containing corrosion-resistant alloy materials. In addition, ferrosilicon nitride is also used in high-temperature structural materials, high-temperature electrical materials, humidification appliance materials and other materials. [0003] So far, the preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06
Inventor 彭虎黄加伍李俊
Owner 长沙隆泰科技有限公司
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