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Method for coating surface of oxide ceramic powder with metal nanoparticles

A technology of metal nanoparticles and oxide ceramics, applied in the field of material processing engineering, can solve the problems of easy agglomeration and growth of nanoparticles, reduced hardness and strength, etc., and achieve the effects of reducing reaction time, production cost, and preparation cycle.

Inactive Publication Date: 2014-11-19
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at a higher coating temperature, the nanoparticles are easy to agglomerate and grow up, resulting in a decrease in the hardness and strength of the powder after sintering (Journal of the European Ceramic Society, 2014, 34, pp435-441)

Method used

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  • Method for coating surface of oxide ceramic powder with metal nanoparticles
  • Method for coating surface of oxide ceramic powder with metal nanoparticles
  • Method for coating surface of oxide ceramic powder with metal nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Al 2 o 3 The surface of the powder is coated with Ni nanoparticles.

[0026] First, the common commercial 5g Al 2 o 3 Powder (particle size is 500nm) and 0.5g Ni(CO) 4 After mixing, put it into a rotary reactor, and rotate the reactor at a rotation rate of 45 r / min. The mixed gas of oxygen and Ar is introduced, the total pressure of the mixed gas is 1000Pa, and the partial pressure of oxygen is 100Pa. The heating rate is 8°C / min, and the temperature is raised to 450°C and then kept for 45 minutes to make Ni(CO) 4It is oxidized to nickel oxide, then the oxygen supply valve is closed, and carbon monoxide is introduced to reduce the metal oxide nickel oxide to metallic nanoparticles. The partial pressure of carbon monoxide is 200Pa, the reduction reaction time is 45min, and then the temperature starts to drop, and the temperature drop rate is 8°C / min. After cooling down to room temperature, close the gas valve, stop the rotation of the instrument and the h...

Embodiment 2

[0027] Example 2 Al 2 o 3 The surface of the powder is coated with Cu nanoparticles.

[0028] First, the common commercial 5g Al 2 o 3 Powder (100nm particle size) and 2g Cu(DPM) 2 (copper dipivaloylmethanate) mixed, put into the rotary reactor, close the inlet valve of the rotary reactor, start the rotary reactor to rotate, and adjust the rotation rate to 60r / min. Then feed the mixed gas of oxygen and argon, the total pressure of the mixed gas is 800Pa, and the partial pressure of oxygen is 50Pa. The heating rate was set at 5°C / min, and the temperature was raised to 400°C and kept for 60 minutes to make Cu(DPM) 2 It is oxidized to copper oxide, then the oxygen supply valve is closed, and methane is introduced to reduce the metal oxide CuO to metallic nanoparticles. The partial pressure of methane is 100Pa, the reduction reaction time is 60min, and then the temperature starts to drop, and the temperature drop rate is 5°C / min. After cooling down to room temperature, clos...

Embodiment 3

[0029] Example 3 ZrO 2 The surface of the powder is coated with Ni nanoparticles.

[0030] First, common commercial 5g ZrO 2 Powder (particle size is 10μm) and 5g NiCp 2 (nickelocene) mixed, put into the rotary reactor, the reactor is rotated, the rotation rate is 15r / min. A mixed gas of oxygen and Ar is introduced, the total pressure of the mixed gas is 800Pa, and the partial pressure of oxygen is 200Pa. The heating rate was 7°C / min, and the temperature was raised to 450°C and then kept for 30 minutes, so that the NiCp 2 It is oxidized to NiO, then the oxygen supply valve is closed, and hydrogen gas is introduced to reduce the metal oxide NiO to metallic nanoparticles. The partial pressure of hydrogen is 400Pa, the reduction reaction time is 30min, and then the temperature starts to drop, and the temperature drop rate is 7°C / min. After cooling down to room temperature, close the gas valve, stop the rotation of the instrument and the heating of the reactor, open the instr...

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Abstract

The invention discloses a method for uniformly coating the surface of oxide ceramic powder with carbon impurity-free metal nanoparticles. The method comprises the following steps: grinding and mixing a metal organic raw material and the oxide ceramic powder, and putting the mixture into a rotary reaction chamber; under a rotary heating condition, introducing oxidizing gas to oxidize the metal organic raw material into a metal oxide; and introducing reductive gas to reduce the metal oxide into metal-state nanoparticles. Through adoption of the method, uniform coating of the metal-state nanoparticles is realized, and the problems of roughening and growing of the nanoparticles caused by a long-term coating reaction at a high temperature are solved. The method disclosed by the invention is simple, and is short in the preparation period. The prepared metal nanoparticles are dispersed uniformly, and the oxide ceramic powder coated by the metal nanoparticles have wide application prospects in a plurality of fields as a catalytic material, conductive ceramics and the like.

Description

technical field [0001] The invention specifically relates to a method for coating metal nanoparticles on the surface of an oxide ceramic powder, which belongs to the field of material processing engineering. Background technique [0002] In ceramic powder, especially alumina (Al 2 o 3 ), zirconia (ZrO 2 ), silicon oxide (SiO 2 ), ferric oxide (Fe 3 o 4 ) and other oxide powders are coated with one or more heterogeneous metal nanoparticles, which can have the properties of metal-coated shell and ceramic core at the same time, and reduce the powder agglomeration effect and various phases (especially metal and ceramics) ) to endow the oxide powder with new properties, such as catalytic properties, electromagnetic properties, etc., or effectively change the surface properties of the powder, such as electrochemical properties and diffusion capacity during sintering. Therefore, the development of coating technology and its application in many fields such as structural and fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628
CPCC04B35/053C04B35/111C04B35/14C04B35/46C04B35/486C04B35/62615C04B35/6265C04B2235/405C04B2235/407C04B2235/44C04B2235/652C04B2235/658C04B2235/6582C04B2235/6583C04B2235/781C04B2235/786C04B41/5188C04B35/628C04B35/62892C04B35/6325C04B35/04C04B35/10C04B35/48C04B35/6261C04B35/62842
Inventor 张建峰吴玉萍郭文敏洪晟李改叶
Owner HOHAI UNIV
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