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Precursor conversion method preparation process of ZrB2-SiC ceramic composite powder

A technology of ceramic composite and preparation process, which is applied in the preparation process of ZrB2-SiC ceramic composite powder precursor conversion method and the field of preparation of ultra-high temperature ceramic raw material powder, which can solve the problems of high impurity content of products, poor powder dispersion High cost and other issues, to achieve the effect of low raw material cost, low cost and uniform particle size

Active Publication Date: 2018-08-10
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned prior art, such as high preparation cost, poor powder dispersibility, and high impurity content in the product, the object of the present invention is to provide a ZrB 2 -Precursor conversion method preparation process of SiC ceramic composite powder, the raw material is easy to obtain, the process is simple, the pyrolysis temperature is low, and the product is pure

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  • Precursor conversion method preparation process of ZrB2-SiC ceramic composite powder
  • Precursor conversion method preparation process of ZrB2-SiC ceramic composite powder

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Embodiment 1

[0015] a ZrB 2 -Precursor conversion method preparation process of SiC ceramic composite powder, the specific process is as follows:

[0016] (1) Step 1: According to the amount ratio of substances, it is boric acid: zirconium oxychloride octahydrate: ethyl orthosilicate=100:9:40, glucose is calculated according to the carbon obtained after pyrolysis is complete, that is, C / (Zr+Si )=4, respectively weigh zirconium oxychloride octahydrate, boric acid, ethyl orthosilicate, and glucose for subsequent use.

[0017] (2) Step 2: Under the condition of continuous magnetic stirring, dissolve zirconium oxychloride in absolute ethanol, add a small amount of hydrogen peroxide and acetylacetone dropwise, and prepare a uniform and transparent solution, namely zirconium precursor solution. Dissolve boric acid in absolute ethanol, heat in a water bath until completely dissolved, and prepare boric acid solution. Dissolve ethyl orthosilicate in absolute ethanol to prepare ethyl orthosilicate...

Embodiment 2

[0020] a ZrB 2 -The precursor conversion method preparation process of SiC ceramic composite powder, except that the following experimental raw material ratio and heat treatment temperature are different, all the other are the same as embodiment 1.

[0021] In this embodiment: the amount ratio of the raw materials taken is boric acid: zirconium oxychloride octahydrate: ethyl orthosilicate=100:15:50, glucose is calculated according to the carbon obtained after pyrolysis is complete, that is, C / (Zr +Si)=5; the heat treatment temperature is 1600°C.

Embodiment 3

[0023] a ZrB 2 -SiC ceramic composite powder precursor conversion method preparation process, except that the ratio of raw materials in the following experiments is different, all the other are the same as in Example 1.

[0024] In this embodiment: the amount ratio of the raw materials taken is boric acid: zirconium oxychloride octahydrate: ethyl orthosilicate=100:10:60, and glucose is calculated according to the carbon obtained after pyrolysis is complete, namely C / (Zr +Si)=6.

[0025] The present invention adopts the precursor conversion method, the required raw materials are simple and easy to obtain, the prepared precursor solution can achieve the mixing of different components at the molecular level, the required pyrolysis temperature is low, and the purity of the obtained ceramic product is high, Uniform particle size.

[0026] Embodiment 1 gained product, from figure 1 It can be seen that the phase composition of the composite ceramic powder prepared by the preparati...

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Abstract

The invention discloses a precursor conversion method preparation process of ZrB2-SiC ceramic composite powder. According to the process, zirconium oxychloride octahydrate, boracic acid, ethyl orthosilicate and glucose are used as starting materials; absolute ethyl alcohol and deionized water are used as solvents; the mass ratio of raw material substances of the boracic acid to the zirconium oxychloride octahydrate to the ethyl orthosilicate is 100:(9 to 20):(18 to 60); the carbon sources are excessive; a zirconium precursor solution, a boracic acid solution, an ethyl orthosilicate solution and a glucose solution are respectively prepared; all solutions are uniformly mixed to obtain a boron silicon zirconium precursor solution; after the boron silicon zirconium precursor solution is dried,heat treatment is performed for 1 to 2h at 1450 to 1600 DEG C under the argon gas atmosphere protection; the ZrB2-SiC ceramic powder is obtained. The preparation process has the characteristics of simple process, short period, low energy consumption and low cost; the obtained ceramic phase has uniform granularity and high activity; no impurity phases exist.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and relates to a preparation method of an ultra-high temperature ceramic raw material powder, in particular to a ZrB 2 -Precursor conversion method preparation process of SiC ceramic composite powder. Background technique [0002] ZrB 2 Ceramics have the characteristics of high specific strength, high melting point, high specific modulus, and excellent oxidation resistance, ablation resistance, and good thermochemical stability. It is an ultra-high temperature ceramic material with excellent performance. Studies have shown that in ZrB 2 The introduction of SiC in ceramics can not only significantly improve the ZrB 2 sintering properties, and the prepared ZrB 2 -SiC composite ceramics have more excellent oxidation resistance and high temperature mechanical properties. [0003] Currently ZrB 2 -The traditional preparation methods of SiC ceramic powder mainly include: ...

Claims

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Application Information

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IPC IPC(8): C04B35/573C04B35/626
CPCC04B35/573C04B35/62645C04B2235/5445
Inventor 刘长青常小靖伍媛婷孙良李成新
Owner SHAANXI UNIV OF SCI & TECH
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