A kind of three-dimensional porous nitride nano-ceramic and preparation method thereof

Abstract

The invention relates to a three-dimensional porous nitride nano-ceramic and a preparation method thereof. The preparation method comprises the following steps: mixing 0.5-25 wt% of a raw material I,0.5-25 wt% of a raw material II and 55-99 wt% of deionized water, and performing stirring under a water bath condition to obtain a mixed solution, wherein the raw material I is one of a boron source,an aluminum source, a silicon source and a titanium source, the boron source is boric acid, boron oxide or sodium borate, the aluminum source is aluminum chloride, aluminum isopropoxide or alumina sol, the silicon source is ethyl orthosilicate, sodium silicate or silica sol, and the titanium source is titanium chloride, tetrabutyl titanate or titanium sol; and the raw material II is melamine, azacytosine or dicyanodiamide; and freezing the mixed solution to form a block, drying the block in a lyophilizer, placing the dried block in a box type atmosphere furnace, and carrying out heat preservation at 900-1200 DEG C in a nitrogen atmosphere for 2-4 h to obtain the three-dimensional porous nitride nano-ceramic. The method has the advantages of simple process, low cost and high yield, and theprepared product has the advantages of low apparent density, high porosity and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of porous nitride nano ceramic materials. In particular, it relates to a three-dimensional porous nitride nano-ceramic and a preparation method thereof. Background technique [0002] Porous materials can be widely used as catalyst supports, hydrogen storage materials, chemical filtration purification materials, etc. Commonly used porous materials are porous oxides, such as SiO 2 , γ-A1 2 o 3 , zeolite molecular sieves, etc. Although they have a high specific surface area, their thermal conductivity is low (easy to cause sintering of the material), and they have a hydrophilic surface (easy to absorb a layer of water from the surrounding environment on the surface of the material), Strong chemical activity (easy to form acidic or basic points on the surface of the material), such materials will greatly reduce their activity and stability under some harsh reaction conditions, such as high temperature and hi...

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Problems solved by technology

The above-mentioned technologies, whether it is the prepared three-dimensional porous structure material or the production method, all have the following shortcomings: the apparent density of the porous material is high, the porosity is low; the preparation steps are cumbersome, the production cycle is long, and the yield Low cost, high cost, not conducive to industrial mass production

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