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Heterogeneous nucleation preparation method for LaPO4 coating alpha-Al2O3 powder body

A non-uniform, powder technology, applied in the field of inorganic composite powder preparation, can solve the problem of no relevant reports on powder, and achieve the effects of easy control, good processing performance, and simple steps

Inactive Publication Date: 2010-03-17
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation of LaPO by heterogeneous nucleation method 4 coated with α-Al 2 o 3 There is no relevant report on the powder at home and abroad

Method used

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  • Heterogeneous nucleation preparation method for LaPO4 coating alpha-Al2O3 powder body
  • Heterogeneous nucleation preparation method for LaPO4 coating alpha-Al2O3 powder body
  • Heterogeneous nucleation preparation method for LaPO4 coating alpha-Al2O3 powder body

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Embodiment Construction

[0010] The present invention selects La(NO 3 ) 3 ·6H 2 O, NaPO 4 12H 2 O and α-Al 2 o 3 As a raw material, α-Al 2 o 3 The average particle size of the particles is around 200nm. La(NO 3 ) 3 ·6H 2 O and Na 3 PO 4 12H 2 O was made into an aqueous solution with a concentration of 0.01mol / L. In order to reduce particle agglomeration and obtain better dispersed α-Al 2 o 3 Suspension, 1g α-Al 2 o 3 Put the powder into 100ml of deionized water, add 0.5wt% dispersant polyammonium methacrylate (PMAA), and ultrasonically disperse for 40min. Then 100ml of La(NO 3 ) 3 The aqueous solution was added to the suspension, and stirred magnetically with a stirrer for 60 min. Then an equal volume and concentration of the above-mentioned Na 3 PO 4 When the aqueous solution is dripped into the suspension, the rate of addition must be controlled slowly, because if the rate of addition is too fast, it is easy to make the LaPO 4 Uniform nucleation occurs and the coating effect ...

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Abstract

The present invention provides a preparation method of non-uniform nucleation of LaPO4-coated alpha-Al2O3. The preparation method is characterized in that at first the alpha-Al2O3 powder is added intodeionized water; a dispersing agent is added for ultrasonic dispersion so as to prepare suspension; the aqueous solution of La(NO3)3 is added into the suspension; the mixture is stirred through magnetic force; then with the stirring of the magnetic force, the aqueous solution of Na3PO4, which has the same volume and the same concentration as the aqueous solution of the La(NO3)3, is dropped into the suspension at the speed of 5 to 15 drops per minute; during the dropping process, the pH value of the suspension keeps constant; after the dropping process is completed, the suspension is continuously stirred for 1 to 3 hours; then the ions of impurities in the suspension is cleaned and the suspension is dried in a drying cabinet. The steps are simple and easy to be controlled. The preparationmethod can be used for not only preparing the weak interface between LaPO4 and Al2O3, but also reducing the content of the soft phase of LaPO4; and the preparation method can lead to higher processingperformances with lower mechanical properties.

Description

technical field [0001] The invention relates to a preparation method of an inorganic composite powder, in particular to a LaPO 4 coated with α-Al 2 o 3 Non-uniform nucleation preparation method of powder. Background technique [0002] In order to improve Al 2 o 3 The machinability of ceramic materials, people put LaPO 4 Join Al 2 o 3 In the matrix, it breaks through the limitation of ceramics in processing performance, so that ceramic materials have broader application prospects. This composite ceramic has good chemical compatibility, high melting point and excellent stability in oxidizing atmosphere. But will LaPO 4 and Al 2 o 3 Direct mixing of two phases requires LaPO 4 The amount is more, and LaPO 4 It is also a weak phase, adding too much will reduce the mechanical properties of the material. [0003] The non-uniform nucleation method is a method commonly used in powder coating. It uses the coated particles as the nucleation matrix. By controlling the conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/628C04B35/10
Inventor 王昕郑秋菊
Owner OCEAN UNIV OF CHINA
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