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A preparation method of a special heating container for microwave synthesis of nanomaterials

A technology of nanomaterials and heating containers, applied in chemical instruments and methods, chemical/physical/physicochemical processes of energy application, chemical/physical/physicochemical processes, etc., can solve the problem of poor crystallinity of synthetic nanomaterials, The problem of uneven heating of synthetic materials and high temperature of the outer wall of the container can achieve the effect of improving microwave transmittance, small stress and simple preparation method

Active Publication Date: 2015-09-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention solves the problems that the conventional heating container is easy to burst in the microwave field, the synthesized material is heated unevenly, the grain crystallinity of the synthesized nanomaterial is not good, the synthesis rate is not high or easy to agglomerate, and the heat preservation effect is not good so that the temperature of the outer wall of the container is high. question

Method used

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  • A preparation method of a special heating container for microwave synthesis of nanomaterials
  • A preparation method of a special heating container for microwave synthesis of nanomaterials

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for preparing a special heating container for microwave synthesis of nanomaterials, comprising the following steps:

[0034] 1. Soak alumina ceramic fiber porous composite material (purchased from Henan Sanmenxia Xihongtai Furnace Technology Co., Ltd.) in distilled water. After it is completely wetted, use a colloid mill to pulverize the fiber so that the maximum length of a single fiber does not exceed 5mm.

[0035] 2. Mix distilled water and ethanol at a volume ratio of 1:1, then add 4ml of hydrochloric acid (according to 500ml of water), and then slowly add ethyl orthosilicate with a burette, while stirring continuously, the weight ratio of ethyl orthosilicate to ethanol The ratio is 1:1, and the prepared tetraethyl orthosilicate hydrolyzate is left to age for 2 hours.

[0036] 3. Mix the above-mentioned ethyl orthosilicate hydrolyzate and alumina ceramic fiber porous composite material (1:3 weight ratio) evenly, put them into a mold and press them into shap...

Embodiment 2

[0043] The difference between this embodiment and embodiment 1 is only:

[0044] Utilize long-chain alkanol (isopropanol) instead of ethanol to prepare tetraethyl orthosilicate precursor (tetraethyl orthosilicate hydrolyzate), and the performance of the obtained heating container is as follows:

[0045] Maximum temperature resistance: 2000°C, thermal conductivity: 0.017W / m.k, thermal expansion coefficient: 1.6×10 -7 mm / ℃, compressive strength: 5.2Mpa, flexural strength: 1.7Mpa. The porosity is 86%-94%, and the bulk density is 0.6g / cm 3 , with a weight of 0.48Kg.

Embodiment 3

[0047] The difference between this embodiment and embodiment 1 is only:

[0048] The prepared tetraethyl silicate precursor and the alumina ceramic fiber porous composite material have a weight ratio of 1:3.5, and the properties of the prepared heating vessel are as follows:

[0049] Maximum temperature resistance: 2000°C, thermal conductivity: 0.017W / m.k, thermal expansion coefficient: 1.6×10 -7 mm / ℃, compressive strength: 4.5Mpa, flexural strength: 1.3Mpa. The porosity is 88%-96%, and the bulk density is 0.7g / cm 3 , with a weight of 0.53Kg.

[0050] To sum up, the present invention improves the thermal shock resistance of the material in the microwave field for rapid heating of the heating container, and is not easy to burst, and the toughness of the material is enhanced by using ceramic fibers. The microwave transmittance is significantly improved by selecting a suitable low dielectric loss material and the stress-reducing shape design, the thermal insulation effect is g...

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Abstract

The invention discloses a dedicated heating container for microwave synthesis of nanomaterials and a preparation method thereof. The container comprises a container body and a container cover which are both made of an alumina ceramic fiber porous composite material. The alumina ceramic fiber porous composite material (mainly containing Al2O3) is selected for replacing a conventional common refractory material, and thus a container thermal expansion stress caused by a high temperature reaction material is buffered, a thermal shock resistance property of the heating container is promoted when the material is rapidly heated up in a microwave field, the heating container is not easy to crack, and a ceramic fiber is utilized to reinforce toughness in the material. With selection of a suitable material with low dielectric loss and a shape design capable of reducing stress, the microwave transmittance is significantly improved, and the heat insulation effect is good; and the preparation method has simple preparation process, is low in cost, and can be applied to large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of nanomaterial synthesis, in particular to a special heating container suitable for synthesizing nanomaterials by means of microwave heating and a preparation method thereof. Background technique [0002] As a hotspot in material research, nanomaterials fundamentally change the structure of materials. Nanomaterials refer to materials composed of extremely fine particles with characteristic dimensions on the order of nanometers (1-100nm). Due to the extremely fine grains and a large number of atoms in the grain boundaries and defects in the grains, the performance of nanomaterials is very different from that of micron-sized or larger materials with the same composition, which affects the electrical, thermal and magnetic properties of materials. , Optical properties can have an important impact. Therefore, the study of synthetic nanomaterials is of great significance to the progress of modern science and te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/12B01J19/02C04B35/66
Inventor 曾令可周其星刘平安刘艳春王慧程小苏侯来广
Owner SOUTH CHINA UNIV OF TECH
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