A kind of preparation method of glass/ceramic nanocomposite material
A nanocomposite material and technology of composite materials are applied in the field of preparation of glass/ceramic nanocomposite materials, which can solve the problems of reducing the uniformity of material components, unfavorable batch preparation of powder, deterioration of material properties, etc., and achieves low loss and preparation method. Simple, high breakdown field strength effects
Active Publication Date: 2017-10-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
The sol-gel method can obtain powder with high uniformity and high purity, but due to high cost, it is not conducive to batch preparation of powder. Considering industrial production, mechanical ball milling method is still the first choice. Mechanical ball milling method is a method that uses ball mill rolling , a method in which hard balls continuously collide and crush raw materials to reduce their particle size
However, the particle size limit of the powder obtained by the mechanical ball milling method can only reach about 2 μm, and the particle diameter of the nano-ceramic medium is relatively small (<100nm). Particles, which reduce the uniformity of the material composition and deteriorate the performance of the material
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[0048] A method for preparing glass / ceramic nanocomposite material specifically includes the following steps:
[0049] Step 1: According to the glass: 21mol% BaO, 15mol% B 2 O 3 , 5mol% Al 2 O 3 , 59mol% SiO 2 The ratio of the precursor Ba(NO 3 )(99.5%), H 3 BO 3 (99.5%), Al(NO 3 ) 3 ·9H 2 O (99%) and high-purity quartz sand (99.99%), then put the above precursors into a ball mill tank containing deionized water, ball mill for 24 hours, and then discharge and dry;
[0050] Step 2: Put the powder obtained in step 1 into the crucible of the melting furnace, firstly increase the temperature from room temperature to 1200°C at a heating rate of 15°C / min, and then increase the temperature from 1200°C to 1550°C at a heating rate of 8°C / min At this time, it is the clarification temperature of the glass and quenched at a high temperature to obtain a glass block; the block is mechanically crushed, then ball milled for 72 hours, and finally passed through a 300 mesh sieve to obtain glass powde...
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Abstract
The invention discloses a method for preparing a glass / ceramic nanocomposite material, which belongs to the field of material preparation. After mixing the glass powder with the nano-ceramic dielectric powder, ball-milling and drying, and then going through at least one "pre-firing, ball-milling" process, the glass powder can be evenly coated with the nano-ceramic dielectric powder, and the breakdown field strength of the composite material can be improved; Wherein, the pre-firing temperature is higher than the glass softening point temperature and lower than the sintering temperature of the nano-ceramic medium powder. The glass in the composite material prepared by the method of the invention can evenly cover ceramic particles, and the composite material has low loss and high breakdown field strength, and can be used as a high-voltage high-energy storage density capacitor; the preparation method is simple and pollution-free; the sol is overcome The disadvantage of the high cost of the gel method is suitable for industrialized mass production.
Description
Technical field [0001] The invention belongs to the field of material preparation, and specifically relates to a method for preparing a glass / ceramic nano composite material suitable for mass production. Background technique [0002] In recent years, glass-ceramic composite materials have attracted widespread attention from researchers at home and abroad. Compared with traditional dielectric ceramics, the glass-ceramic composite material will fill the pores of the ceramic particles to increase the density of the material, and during the sintering process, the glass at the grain boundary will inhibit the growth of grains and control the grain Increasing the density of the material and refining the grain size will increase the breakdown field strength of the material, and at the same time improve the frequency and temperature characteristics of the material to a certain extent. Related research is in the fields of pulse power energy storage ceramic capacitors There are broad appli...
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IPC IPC(8): C04B35/628C04B35/46
Inventor 张继华刘剑峰魏猛陈宏伟杨传仁
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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