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Preparation method of ceramic particle dispersion hot pressing sintering metal-nanometer ceramic composite

A technology for hot-pressing sintering and ceramic particles, which is applied in the field of preparation of ceramic particles dispersed and distributed in hot-pressing sintered metal-nano-ceramic composites, and can solve the problems of difficulty in entering, adding, and entering in a dispersed state.

Inactive Publication Date: 2013-07-31
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-ceramic particles added with surfactants, on the one hand, all surfactants are difficult to continue to exist at the melting temperature of steel, on the other hand, the large surface energy of molten steel itself makes it difficult to enter the nano-ceramic particles dispersed by surfactants In the gap between them, it is impossible to let this dispersed state enter the molten steel
It is an effective method to use mechanical force to effectively mix nano-ceramic particles and metal powder particles, and use metal powder particles to separate nano-ceramic particles to achieve dispersion of nano-ceramic particles. Before it becomes a fully dense object (whether its density is higher than that of molten steel after fully densified or not), its density will be lower than that of molten steel, so it is difficult to add it into the process by simple gravity addition. In molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A method for preparing a hot-pressed sintered metal-nano-magnesia composite with dispersed ceramic particles:

[0010] The nano magnesium oxide powder with an average particle diameter of 50 nanometers and a purity of 99.9% is mixed with iron powder powder with an average particle diameter of 3.3 microns and a purity of 99.6% and molybdenum powder with an average particle diameter of 3.5 microns and a purity of 99.7%. , according to the mass fraction ratio of 2:85.8:12.2, carefully mixed by hand in an agate mortar for 60 minutes, and then mechanically mixed on a planetary mixer for 120 minutes. Fill the mixed powder into a graphite mold, and then carry out hot pressing and sintering under an argon protective atmosphere. The hot pressing pressure is an axial pressure of 10 MPa, heated to 1323K, and the load is removed after the heat preservation for 30 minutes, and the sintered body is cooled. Turn off the protective gas when the temperature is below 873K. The sintered ...

Embodiment 2

[0012] A method for preparing a hot-pressed sintered metal-nanometer calcium oxide composite with dispersed ceramic particles:

[0013] The nano-calcium oxide powder with an average particle diameter of 50 nanometers and a purity of 99.9% is mixed with iron powder powder with an average particle diameter of 3.3 microns and a purity of 99.6% and molybdenum powder with an average particle diameter of 3.5 microns and a purity of 99.7%. , according to the mass fraction ratio of 2:85.8:12.2, carefully mixed by hand in an agate mortar for 60 minutes, and then mechanically mixed on a planetary mixer for 120 minutes. Fill the mixed powder into a graphite mold, and then carry out hot pressing and sintering under an argon protective atmosphere. The hot pressing pressure is an axial pressure of 10 MPa, heated to 1323K, and the load is removed after the heat preservation for 30 minutes, and the sintered body is cooled. Turn off the protective gas when the temperature is below 873K. The s...

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Abstract

The invention discloses a preparation method of a ceramic particle dispersion hot pressing sintering metal-nanometer ceramic composite. in the method, manual mixing is combined with mechanical mixing; and nanometer ceramic powder such as magnesium oxide and calcium oxide which can exist stably at the molten steel temperature can be fully mixed with pure iron micropowder and pure molybdenum micropowder, then hot pressing sintering is performed on the mixture under the protection of an inert gas. Therefore, on one hand, the mixture of the nanometer ceramic powder, the pure iron micropowder and the pure molybdenum micropowder is solidified, namely the nanometer ceramic powder is separated from the pure iron micropowder and the pure molybdenum micropowder. On the other hand, a sintered body of which density is less than that of molten steel can be obtained, thus after added in the molten steel, the sintered body can be molten in the molten steel and the aim of adding the nanometer ceramicpowder in the molten steel can be realized.

Description

technical field [0001] The invention relates to a preparation method for dispersing and distributing ceramic particles in a hot-pressed sintered metal-nanometer ceramic composite body. Background technique [0002] Fine non-metallic inclusions dispersed in steel will be beneficial to improve the microstructure and mechanical properties of steel. In recent years, with the development of nanotechnology, people try to add nano-ceramic particles to molten steel. However, on the one hand, the density of ceramics is much lower than that of molten steel, and pure ceramics will not easily enter molten steel; on the other hand, due to the small size of nano-ceramic particles, large specific surface area, and high total surface free energy, they are easy to agglomerate . As far as solving the problem of agglomeration, there are currently existing methods to improve the dispersion of nanoparticles, such as: 1. Adding surfactants to reduce their surface energy, 2. Suspending and dispe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C35/00
Inventor 丁龙先王建明刘操邱立星
Owner SHENYANG UNIV
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