Method and apparatus for producing silicon nitride or ferro silicon nitride by low pressure combustion

Abstract

A process for preparing silicon (or ferrosilicon) nitride from silicon powder (or ferrosilicon) powder and the fine powder of silicon (or ferrosilicon) nitride as diluent by low-voltage combustion includes such steps as continuous burning at 900-1850 deg.C in vertical reacting furnace, cooling, and grinding.

Description

Technical field: [0001] The invention relates to a preparation method of an inorganic non-metallic material, in particular to the preparation of silicon nitride or ferrosilicon nitride. Background technique: [0002] Silicon nitride (Si 3 N 4 ) The common preparation methods include direct nitriding method, carbothermal reduction method, gas phase method and combustion synthesis method. The combustion synthesis method is a recently developed method for the preparation of Si with relatively simple equipment, easy operation and high productivity. 3 N 4 Methods. Compared with other preparation methods, the combustion synthesis method has low production cost and is more suitable for industrial production. However, the synthesis of Si by combustion synthesis 3 N 4 There are few reports, and the reports are all combustion synthesis under high-pressure nitrogen. In the reported combustion synthesis of silicon nitride, due to the limitation of high-pressure nitrogen combusti...

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Problems solved by technology

[0003] Aiming at the problem that the existing method of combustion synthesis of silicon nitride or ferrosilicon nitride cannot be produced continuously and on a large scale, the present invention proposes a method for synthesizing silicon nitride or ferrosilicon nitride by low-pressure combustion in a vertical combustion synthesis reaction furnace, which can realize both Discontinuous and continuous large-scale production of silicon nitride or ferrosilicon nitride

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