ZrC-ZrO2 composite ceramic microsphere and preparation method thereof

A technology of composite ceramics and microspheres, which is applied in the field of ZrC-ZrO2 composite ceramic microspheres and its preparation, can solve the problems of high reaction temperature, few reports on the preparation of ZrC small-sized microspheres, and few reports on the methods of composite ceramic microspheres. Achieve the effect of simplifying the production process, uniform size and good sphericity

Active Publication Date: 2014-08-27
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The thermal conductivity of ZrC is significantly better than that of ZrO 2 , but the traditional synthesis techniques of zirconium carbide ceramic powders, such as: low-temperature synthesis, combustion synthesis, carbothermal reduction, etc., require a higher reaction temperature, and there are fewer reports on the preparation of ZrC small-size microspheres
[0004] However, for the preparation of ZrC-ZrO 2 There are few reports on the method of composite ceramic microspheres

Method used

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  • ZrC-ZrO2 composite ceramic microsphere and preparation method thereof
  • ZrC-ZrO2 composite ceramic microsphere and preparation method thereof
  • ZrC-ZrO2 composite ceramic microsphere and preparation method thereof

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preparation example Construction

[0060] According to the preparation ZrC-ZrO of the embodiment of the present invention 2 The method of composite ceramic microspheres can effectively prepare ZrC-ZrO with uniform and controllable size, good sphericity and no cracks. 2 Composite ceramic microspheres, and the resulting composite microspheres combine ZrC and ZrO 2 The advantages of both, solve the ZrO 2 The disadvantage of poor thermal conductivity broadens the ZrO 2 It provides a material for the selection of reactor inert matrix materials and other application fields. At the same time, the preparation of zirconium carbide powder and the formation of spheres are carried out in one step, which simplifies the production process. In the ball washing stage of the process, the high-temperature and high-pressure washing balls of the reactor and the propylene glycol methyl ether washing balls are used to quickly remove impurities and moisture in the balls, which greatly shortens the drying time of the balls and slows...

Embodiment

[0064] Prepare a mixed solution containing 3mol / L hexamethylenetetramine (HMTA) and 2.625mol / L urea (Urea) while cooling to 4°C, add carbon powder to the mixed solution and add Triton 100 and weight Nitrogen salts make the dispersion of carbon powder in the mixed solution uniform and stable; dissolve ZrO(NO 3 ) 2 and Y(NO 3 ) 3 , and configure ZrO(NO 3 ) 2 and 0.14mol / L of Y(NO 3 ) 3 Cool the prepared mixed solution to 4°C; let the above two solutions stand at 4°C for at least 1h, then add the HMTA / Urea solution to the Zr / Y solution, and add HNO at the same time 3 Adjust the pH value to about 1.3, and measure the pH value immediately after the glue is mixed evenly. The prepared glue is stored at 4°C for 1 hour and then used for gelation and dispersion. The concentration of metal ions in the final glue solution is about 0.8-1.1mol / L, the molar ratio of HMTA to metal ions is 1.1-1.3, the molar ratio of urea to metal ions is 0.96-1.14, and the pH value is between 1-2. Bet...

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Abstract

The invention discloses ZrC-ZrO2 composite ceramic microspheres and a preparation method thereof. The preparation method includes steps of (1) mixing ZrO(NO3)2, Y(NO3)3, carbon powder, hexamethylene tetramine and urea to obtain a gel liquid; (2) dispersing the gel liquid obtained in the step (1) into a silicone oil to enable the gel liquid to form gel balls in the silicone oil; (3) aging the gel balls obtained in the step (2) in the silicone oil; (4) washing the gel balls, which is adhered by the silicone oil, obtained in the step (3); (5) drying the gel balls obtained in the step (4); and (6) calcining the dried gel balls obtained in the step (5) to obtain the ZrC-ZrO2 composite ceramic microspheres. With the preparation method, the ZrC-ZrO2 composite ceramic microspheres having good degree of sphericity, uniform size and excellent heat conduction coefficient can be effectively prepared.

Description

technical field [0001] The invention belongs to the field of preparation technology of ceramics, in particular, the invention relates to ZrC-ZrO 2 Composite ceramic microsphere and its preparation method. Background technique [0002] Zirconia (ZrO 2 ) has a very low neutron capture cross section, high melting point and chemical stability, and is stable under radiation conditions. It is often used as an inert matrix for reactor inert matrix fuel (IMF) or as a simulated oxide to simulate other reactors Preparation of fuel elements (such as uranium oxide, plutonium oxide, etc.). In addition, no matter in the nuclear industry or other environmental protection fields, ZrO 2 It is an excellent ion adsorption material. Especially in the separation and extraction of radioactive wastewater, compared with organic adsorbents, for the extraction of radionuclides, ZrO 2 The base material is very radiation and thermal stable, resistant to oxidation and has a stable structure. And Z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/56C04B35/622
Inventor 马景陶高勇赵兴宇郝少昌邓长生
Owner TSINGHUA UNIV
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