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Preparation method of mullite/corundum precursor and nano mullite/corundum

A technology of mullite and precursors, applied in the field of preparation of nano-mullite/corundum and mullite/corundum precursors by micro-boiling method

Inactive Publication Date: 2014-04-02
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all use the sintering method to prepare mullite / corundum materials, and there is no report on the preparation of nano-mullite / corundum materials by chemical wet method.

Method used

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  • Preparation method of mullite/corundum precursor and nano mullite/corundum
  • Preparation method of mullite/corundum precursor and nano mullite/corundum
  • Preparation method of mullite/corundum precursor and nano mullite/corundum

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1 A preparation method of nano-mullite / corundum (aluminum-silicon ratio is 7:1), comprising the following steps:

[0020] Weigh 2.698 grams of aluminum powder, and then slowly put it into 1500ml under stirring conditions with a concentration of 0.2 mol L -1 Hydrochloric acid solution, until the reaction is complete, slowly add it to 286ml with a concentration of 0.05mol L -1 In the slightly boiling silica sol, copper ions were added at the same time (the molar concentration was 0.02 mol·L -1 ) catalyst solution 6ml, keep it for 12h after the reaction is complete, then use infrared heating to dry, and finally grind the dried powder into an electric furnace and heat it to 1300°C (the heating rate is ~20°C·min -1 ), and keep it warm for 1.0 h to prepare nano-mullite / corundum. The SEM of the prepared nano-mullite / corundum see image 3 , The particle size of the nano-mullite / corundum material is mainly distributed between 50 and 100nm.

Embodiment 2

[0021] Example 2 A preparation method of nano-mullite / corundum (aluminum-silicon ratio is 9:1), comprising the following steps:

[0022] Weigh 5.396 grams of aluminum powder, and then slowly put it into 1000ml under the condition of stirring, the concentration is 0.6 mol L -1 Hydrochloric acid solution, until the reaction is complete, slowly add it to 37ml with a concentration of 0.6 mol L -1 In the slightly boiling silica sol, copper ions were added at the same time (the molar concentration was 0.2 mol L -1 ) catalyst solution 4.4ml, after the reaction is complete, keep it for 24 hours, then heat and dry it with infrared, and finally grind the dried fine powder into an electric furnace and heat it to 1400°C (the heating rate is ~5°C·min -1 ), and keep it warm for 6h to prepare nano-mullite / corundum. The SEM of the prepared nano-mullite / corundum see Figure 4 , The particle size of nano-mullite / corundum is mainly distributed between 100-150nm.

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Abstract

The invention relates to a preparation method of a mullite / corundum precursor and nano mullite / corundum. According to the method, aluminum powder, silica sol and hydrochloric acid are used as initial raw materials of mullite / corundum, copper ions are used as catalysts, and then a nano mullite / corundum precursor is prepared by a chemical method; and the nano mullite / corundum can be obtained by high-temperature calcination. According to the method provided by the invention, the raw materials are easily available, the preparation technology is relatively simple, the reaction is easy to control, large special equipment is not needed, investment is small, the production cost is relatively low, the production cycle of the product is short, the efficiency and purity are high, the shape is controllable, the repeatability is good, and the production can be performed as required; the particle size of the prepared nano mullite / corundum is mainly distributed between 50nm and 150nm; and the method has better prospects in industrial application.

Description

technical field [0001] The invention relates to a preparation method of mullite / corundum, in particular to a mullite / corundum precursor and a method for preparing nanometer mullite / corundum by a micro-boiling method. Background technique [0002] Mullite is a general term for a series of minerals composed of aluminosilicates. It is a mineral formed by aluminosilicates at high temperatures. It has good thermal shock stability, excellent creep resistance, low thermal expansion coefficient, low thermal conductivity, and medium However, its hardness and corrosion resistance are slightly poor; while corundum has high hardness, oxidation resistance and corrosion resistance, but its thermal stability and creep resistance are poor. For this reason, people use different methods to prepare mullite / corundum materials, so as to obtain composite materials with good thermal shock resistance, good creep resistance, strong corrosion resistance and high strength. At present, different raw ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01B33/26C04B35/10C04B35/185C04B35/626B82Y30/00
Inventor 杨中正岳红琴李克亮陈希严亮张旭芳邢振贤霍洪媛
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER