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Method for preparing nano-polycrystalline coesite through high-pressure phase transition method

A phase change method and polycrystalline Ke technology, applied in the field of inorganic materials, can solve problems such as adsorption, difficulty in dispersion, and agglomeration, and achieve the effect of high purity and uniform phase

Inactive Publication Date: 2016-10-12
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of agglomeration, adsorption and difficulty in dispersion of nano-primary powders when nano-primary powders are used to prepare nano-polycrystals by high-pressure phase transition

Method used

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  • Method for preparing nano-polycrystalline coesite through high-pressure phase transition method

Examples

Experimental program
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Embodiment 1

[0018] Example 1: Select microcrystalline α-SiO with an average particle size of 10 μm 2 Micropowder, prepare nano polycrystalline coesite material according to the technological process shown in the present invention. Raw material treatment: microcrystalline α-SiO 2 The raw material was stirred and cleaned with absolute ethanol, and when it settled, the upper liquid was poured out, and the α-SiO 2 The micropowder is dried in an oven at 120°C. Add an appropriate amount of deionized water as a binder to make α-SiO 2 The micropowder has a certain humidity, and it is pre-pressed and molded, and the molded sample is put into an oven to dry, and the deionized water that is the most binder is removed.

[0019] Put the completely dried sample into a metal cup, pre-press it again, and put it into the synthesis chamber, such as figure 1 shown. Among them, the components mainly include insulation materials, heating sheets, heating tubes, wrapping tubes, wrapping sheets, insulation ...

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Abstract

The invention relates to a preparation method for nano-polycrystalline coesite. Microcrystalline alpha-SiO2 and nanocrystalline alpha-SiO2 serve as initial materials, after purification decontamination, no binder except deionized water is added, a sintering unit is assembled, and the nano-polycrystalline coesite material is prepared directly through high-temperature ultrahigh pressure sintering. The nano-polycrystalline coesite is single in phase and uniform in grain size, and the situations that the nano-polycrystalline coesite is reunited and grains abnormally grow at the high temperature cannot occur. In this way, the method successfully solves the problems that nanometer raw materials are reunited and grains abnormally grow.

Description

technical field [0001] The present invention relates to a microcrystalline α-SiO 2 The invention discloses a method for preparing nano-polycrystalline coesite by using a press to generate high temperature and ultra-high pressure as a raw material, and belongs to the field of inorganic materials. Background technique [0002] Ceramic materials mostly belong to covalent bond compounds. Under high pressure and high temperature or normal pressure and high temperature conditions, there are generally many phase transitions. The high pressure and high temperature phases of some ceramic materials can be intercepted under normal pressure conditions; the phase transition of ceramic materials under normal pressure and high temperature Most of them can also occur under high pressure and high temperature, and can be intercepted by normal temperature and pressure. Therefore, a variety of nano-ceramic polycrystals can be prepared by using large-grain ceramic powder crystals as initial mat...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/622C04B35/645C04B35/626
CPCC04B35/14C04B35/622C04B35/626C04B35/645C04B2235/5436C04B2235/60C04B2235/658C04B2235/66C04B2235/781
Inventor 王海阔刘俊龙李颖
Owner HENAN UNIVERSITY OF TECHNOLOGY
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