Fractionation method for AlON transparent ceramic powder

A technology of transparent ceramics and powders, applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, etc., can solve the problems of high sintering temperature of AlON transparent ceramics, large powder particle size, difficulty in obtaining powders, etc., and achieve easy separation , stable performance and easy operation

Inactive Publication Date: 2019-01-04
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Carbothermal reduction nitriding method is an effective means to synthesize AlON powder, but due to the high temperature of powder synthesis and long holding time, the particle size of the synthesized powder is relatively large
Although powder refinement can be achieved to a certain extent by ball milling, it is not easy to directly obtain powders with ideal particle size distribution only by ball milling, which is an important reason for the high sintering temperature and long holding time of AlON transparent ceramics

Method used

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  • Fractionation method for AlON transparent ceramic powder
  • Fractionation method for AlON transparent ceramic powder
  • Fractionation method for AlON transparent ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing AlON transparent ceramic powder suspension and differential centrifugal separation of particles of different sizes, said method comprising the following process steps:

[0037] Weigh 10g of ball-milled AlON transparent ceramic powder and 0.5g of polyvinylpyrrolidone (PVP), pour them into a container together with 200g of absolute ethanol (analytical grade), and place them in an ultrasonic cleaner for 5min (ultrasonic frequency: 40kHz) ) to obtain an anhydrous ethanol suspension of AlON powder, ~4g.

[0038] Take ~80ml of AlON powder suspension in absolute ethanol and place it in a centrifuge tube, and centrifuge at 1000rpm for 1min to complete the first centrifugation of AlON transparent ceramic powder. Pour out the upper liquid, and the obtained precipitate is the first centrifuged particles of AlON powder after ball milling.

[0039] Pour 40ml of absolute ethanol into the separated AlON powder, ultrasonically clean for 5min, soak for 10min, the...

Embodiment 2

[0041] Put the upper layer liquid after centrifugation in Example 1 into a centrifuge tube, centrifuge at a speed of 2000rpm for 3 minutes for the second centrifugation, remove the centrifuged upper layer liquid, and the precipitate in the centrifuge tube is the AlON powder obtained from the second separation body. Using the alcohol washing method shown in Example 1 to add absolute ethanol, ultrasonication, and centrifugation again, the alcohol washing of the AlON powder is completed. The difference from the alcohol washing in Example 1 is that according to the amount of sediment, each alcohol washing uses no The amount of water ethanol is 20ml, and the rotating speed is 4000rpm. The SEM image of the AlON powder obtained after the second centrifugation is shown in the appendix Figure 4 , the particle size of AlON powder obtained after this separation is mainly 1.0-2.0 μm.

Embodiment 3

[0043] The difference between embodiment 3 and embodiment 2 is that the object of centrifugation is the upper layer liquid of embodiment 2, the centrifugation speed is 3000rpm, and the centrifugation time is 7min, and when the centrifuged sediment is washed with alcohol, the anhydrous The amount of ethanol is 15ml, and the rotation speed is 5000rpm. The SEM image of the AlON powder obtained after the third centrifugation is shown in the appendix Figure 5 , the particle size of AlON powder obtained after this separation is mainly 0.6-1.0 μm.

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Abstract

The invention relates to a fractionation method for an AlON transparent ceramic powder, and relates to the technical field of preparation of transparent ceramic powders. The fractionation method for the AlON transparent ceramic powder comprises the following steps: mixing the AlON transparent ceramic powder, a dispersing agent PVP (Poly Vinyl Pyrrolidone) and a solvent absolute ethyl alcohol to obtain an AlON suspension; after carrying out repeated centrifugal separation on the suspension, carrying out washing by utilizing the absolute ethyl alcohol; and carrying out drying. By adopting the fractionation method for the AlON transparent ceramic powder, which is disclosed by the invention, the powder does not need to be preprocessed; the solvent is the absolute ethyl alcohol and is toxic-free and harmless; the PVP is adopted as the dispersing agent; and by controlling a rotating speed and centrifugation time of a centrifugal machine, effective separation on different sizes of particles in the AlON powder can be implemented. Moreover, in the separation process, introduction of harmful impurities is avoided; the suspension is stable in performance and long in settling time; the fractionation method is convenient to operate; and after separation, the PVP can be effectively removed by ethanol washing.

Description

technical field [0001] The invention relates to a method for fractionating and separating AlON transparent ceramic powder, and relates to the technical field of transparent ceramic powder preparation. Background technique [0002] Spinel-type aluminum oxynitride (γ-AlON) is referred to as AlON, which is AlN-Al 2 o 3 The solid solution in the binary system has good light transmission in a wide range of wavelengths from ultraviolet, visible to infrared (0.2-6.0 μm), and has excellent mechanical properties. It is a very potential structure— Functionally integrated materials have broad application prospects in military and civilian fields such as optical guidance, transparent armor, and transparent windows for advanced delivery equipment. [0003] In recent years, based on AlON powder, AlON transparent ceramics have been prepared by hot pressing sintering, hot isostatic pressing sintering, spark plasma sintering and pressureless sintering, but each technology has certain probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00C04B35/581
CPCC01F7/00C01P2002/72C01P2004/03C01P2004/61C01P2004/62C04B35/581
Inventor 单英春朱丹徐久军
Owner DALIAN MARITIME UNIVERSITY
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