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Method for preparing light nano porous ceramics

A nano-microporous and ceramic technology, applied in the fields of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems that the technology cannot meet the requirements of performance indicators, reduce manufacturing costs, and gel injection molding toxicity, and achieve pore size and porosity. Adjustable, improved production efficiency, and short response time

Inactive Publication Date: 2011-02-02
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods generally have the disadvantages of long production cycle, complex reaction conditions, or high energy consumption.
[0003] In recent years, the preparation technology of porous ceramics has made great progress, but there are still some problems to be solved, such as the reduction of manufacturing costs and the precise control of the size of the pores , the relationship between porosity and strength, the toxicity of gel injection molding, etc.
From the perspective of the current preparation of porous ceramics, a single preparation technology often cannot meet the current performance index requirements

Method used

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preparation example Construction

[0014] In conjunction with the accompanying drawings, a method for preparing lightweight nano-microporous ceramics of the present invention includes the following steps: Step 1, mixing raw materials, primary minerals and explosives, and loading the above-mentioned mixed material 3 into a closed detonation container 7, insert the detonator 2, and then seal the material and the detonator with a waterproof material; the above-mentioned raw material is a mixture of one or two or more of waste sludge, waste ceramics, and waste slag, and the mass percentage of the raw material is 50% to 75%. %; the primary mineral is one or a mixture of two or more of feldspar, kaolin, and clay, and the mass percentage of the primary mineral is 20%-45%; the mass percentage of the explosive is 1%-15%. The waterproof material includes oil paper and plastic film; the explosive includes trinitrotoluene, ammonium nitrate nitrocellulose, nitroglycerin, RDX, and trinitrotoluene / RDX. The explosive is prefer...

Embodiment 1

[0025] In a volume of 1M 3 Inject 0.4M into the cartridge 3 Water is used as protection and cooling medium, with 7 parts of explosives (TNT / RDX mass ratio is 70 / 30), 40 parts of aluminum oxide content is 19%, the waste ceramics that silicon oxide content is 74%, 30 parts of waste sludge, and 23 parts The clay is crushed and mixed, packaged with a 8# detonator in a plastic bag and suspended in the cylinder, ignited and detonated, and the product after the explosion is collected and passed through a 100-mesh sieve to remove impurities such as metal wires and tape fragments, and heated in a single phase at 850 °C Pressing and sintering to obtain a density of 0.44kg / m 3 , The porosity is 65%, the nano-microporous ceramics with a pore size of 600nm, and the compressive strength is 8.2MPa.

Embodiment 2

[0027] In a volume of 2M 3 Inject 0.8M into the cartridge 3 Water is used as protection and cooling medium, with 15 parts of explosives (TNT / RDX mass ratio is 30 / 70), 25 parts of waste slag with alumina content of 15% and silicon oxide content of 70%, 30 parts of waste sludge, 20 parts of kaolin , 10 parts of clay were crushed and mixed, packaged with a 8# detonator in a plastic bag and suspended in the cylinder, ignited and detonated, and the products after the explosion were collected and passed through a 100-mesh sieve to remove impurities such as metal wires and tape fragments, and placed at 950 ° C Single-phase hot pressing sintering to obtain a density of 0.32kg / m 3 , Nano-microporous ceramics with a pore size of 20nm, and a compressive strength of 3.4MPa.

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Abstract

The invention discloses a method for preparing light nano porous ceramics, which comprises: mixing raw materials, primary minerals and explosive, filling the mixed materials in a closed detonation container, placing a detonator, and sealing the materials and the detonator by a waterproof material; filling water into the closed detonation container as pressure-keeping and cooling medium; priming the detonator and collecting detonation products, and sieving the collected products; and performing single-phase hot pressed sintering of the sieved products. In the invention, the nano powder prepared from nano ceramics is obtained by impacting the crushed raw materials with the huge energy provided by detonation reaction instantly, the energy consumption is extremely low, and the reaction time is extremely short. The method has a great significance for improving production efficiency and improving benefits.

Description

technical field [0001] The invention belongs to the interdisciplinary field of nanometer materials and structural ceramic materials, in particular to a preparation method of lightweight nanometer microporous ceramics. Background technique [0002] Cahn, a famous British material scientist, wrote in the journal Nature that nano-ceramic is a strategic way to solve the brittleness of ceramics. Nano-ceramic refers to the ceramic material in the microstructure, the grains, grain boundaries and the combination between them are at the nano-scale level. Due to the refinement of nano-ceramic grains, the number of grain boundaries increases greatly, which can make the material The strength, toughness and superplasticity are greatly improved, which has an important impact on the mechanical, electrical, optical, thermal, magnetic and other properties of the material. At present, there are mainly the following methods for preparing nanopowder of nanoceramics: 1. Liquid treatment, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00C04B35/64C04B33/132C04B33/32C04B35/622
CPCY02P40/60
Inventor 石晓琴陈光崔崇赖建中张士华彭东文邹友生丁锡峰江金国王雄
Owner NANJING UNIV OF SCI & TECH
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