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Method for preparing nano heterogeneous ceramic by modified porous structural powder

A technology of porous structure and multiphase ceramics, applied in the field of ceramics, can solve the problems such as the difficulty of fully dispersing nanoparticles, and achieve the effect of uniform distribution of components

Inactive Publication Date: 2002-12-18
SOUTH CHINA UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] Deficiencies of existing methods: nanoparticles must be prepared first, due to the huge specific surface area of ​​nanoparticles, they are very easy to agglomerate, and it is difficult to fully disperse nanoparticles in the matrix solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] AlCl 3 Hydrolysis, polymerization, preparation of aluminum polyhydroxy complex ion, [Al 13 o 4 (OH) 24 (H 2 O) 12 ] 7+ ions, making diatomite into a suspension, adding aluminum polyhydroxyl complex ions into the suspension, and stirring the aluminum polyhydroxyl complex ions into the pores of the diatomite to prepare a modified porous structure powder. The modified powder is mixed with ceramic powder, shaped, and then sintered at 1150°C to make ceramics. After analysis and testing, the mineral composition of the ceramic material is mullite and cristobalite. Among them, mullite has two phases, one of which is wrapped by cristobalite. The average particle size of the wrapped mullite is 13 nanometers, forming a nanocomposite phase. phase ceramics.

Embodiment 2

[0019] AlCl 3 Hydrolysis, polymerization, preparation of aluminum polyhydroxy complex ion, [Al 13 o 4 (OH) 24 (H 2 O) 12 ] 7+ ion, the ZrCl 4 Hydrolysis, preparation of zirconium polyhydroxy complex ion, [Zr 4 (OH) 8 (H 2 O) 16 ] 8+ . The diatomite is made into a suspension, aluminum polyhydroxyl complex ions and zirconium polyhydroxyl complex ions are added to the suspension, and the polyhydroxyl metal ions enter the pores of the diatomite through stirring to prepare a modified porous structure powder. The modified powder is molded and then sintered at 1150°C to make ceramics. After analysis and testing, the mineral composition of the ceramic material is mullite, zircon, and cristobalite. Mullite and zircon are wrapped by cristobalite. The average particle size of mullite and zircon is 11 nanometers and 9 nanometers. Formation of nano-micron composite ceramics. Compared with mullite ceramics, its strength, wear resistance, toughness and other mechanical properti...

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Abstract

The method for preparing nano complex-phase ceramics by using modified porous structure powder body includes the following steps: adopting chemical assembly method to introduce the component into thepores of porous material with unsaturated bond to obtain modified porous structure powder body, mixing the modified porous structure powder body with ceramic raw material powder body, forming and sintering so as to obtain the invented nano complex-phase ceramics with uniformly-distributed component of powder body.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a method for preparing nano-composite ceramics by modifying porous structure powder. Background technique [0002] Ceramic materials have the strength similar to metal and are superior to metal in wear resistance, high temperature resistance and chemical stability, and can be used in harsh environments where general metal materials are not suitable, such as high temperature and strong corrosion environments. In addition, parts made of ceramics are light in weight and have good heat insulation, which is of great significance for improving energy efficiency. However, due to its internal structure, ceramic materials are brittle and sensitive to internal defects. Once cracks are generated, they tend to expand rapidly, causing the material to suddenly fracture without warning and catastrophe. As a result, ceramic components are less reliable than metal components, which has become a...

Claims

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Application Information

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IPC IPC(8): C04B35/622
Inventor 苏达根张志杰
Owner SOUTH CHINA UNIV OF TECH
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