A method for preparing silicon nitride powder from sawdust

A technology of silicon nitride powder and sawdust, which is applied in the field of ceramics, can solve the problems of wide particle size distribution range, low powder purity, irregular particle shape, etc., and achieve the effect of narrow particle size distribution range, good performance and small particle size

Inactive Publication Date: 2011-12-28
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

These production processes have disadvantages in varying degrees. Among them, the silicon powder nitriding method is a traditional preparation method. The obtained powder has low purity, irregular particle shape and wide particle size distribution range, and the product needs further processing

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  • A method for preparing silicon nitride powder from sawdust
  • A method for preparing silicon nitride powder from sawdust
  • A method for preparing silicon nitride powder from sawdust

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Embodiment Construction

[0028] The method for preparing silicon nitride powder from sawdust according to the present invention is based on the following principles: use sawdust and silica sol as the main raw materials, make full use of the characteristics of porous sawdust, easy impregnation, carbonization at high temperature, and easy grinding of the produced powder , through the sol-gel method, inorganic substances are introduced into the wood chips, and the gel with silica as the main component is filled in the pores of the wood, so that the raw materials are mixed evenly, and then the carbothermal reduction nitriding method is selected, and the impregnated Sawdust of silica sol, in a high-temperature controlled atmosphere furnace, carbonization, carbon thermal reduction and nitriding in one step to prepare Si 3 N 4 Ceramic powder. The overall reaction formula of this carbothermal reduction nitriding reaction is:

[0029] 3SiO 2 (s)+6C(s)+2N 2 (g)==Si 3 N 4 (s)+6CO(g)

[0030] Relevant stud...

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Abstract

The invention discloses a method for preparing silicon nitride powder by using wood chips. The method uses wood chips and silica sol as main raw materials, fully utilizes the characteristics of wood chips that are porous and easy to impregnate, carbonized at high temperature, and the powder produced is easy to grind. The sol-gel method introduces inorganic substances inside the wood chips, and realizes that the gel mainly composed of silica is filled in the pores of the wood, so that the raw materials are mixed evenly, and then the carbothermal reduction nitriding method is selected to impregnate the silica sol In a high temperature controlled atmosphere furnace, carbonization and carbon thermal reduction nitriding are carried out in one step to prepare Si3N4 ceramic powder. The invention has the advantages of obtaining Si3N4 ceramic powder with high purity, high α-phase content, small particle size and narrow particle size distribution range, and preparing excellent Si3N4 ceramic powder through low-cost process technology, so that wood chips can be obtained reasonably and fully application, turning waste into treasure. Experiments have proved that this is a very effective and feasible way to synthesize silicon nitride powder with good performance.

Description

technical field [0001] The invention relates to the technical field of ceramics, and in particular provides a method for preparing silicon nitride powder by using sawdust, and the silicon nitride has high purity and strong feasibility. Background technique [0002] Because of its high strength, high hardness, corrosion resistance, oxidation resistance and good thermal shock and mechanical shock resistance, silicon nitride is considered by the material science community to have excellent comprehensive performance in the field of structural ceramics and is the most promising alternative to nickel-based alloys. It is a new type of material widely used in high-tech and high-temperature fields. [0003] In silicon nitride ceramic materials, in addition to reaction sintered silicon nitride, silicon nitride products are manufactured by other processes using silicon nitride powder raw materials. The properties of powder raw materials have a great influence on the process, structure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/626C04B35/584
Inventor 尹洪峰马啸尘任耘张军战汤云
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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