Technology for preparing zirconium nitride ceramic microspheres and zirconium nitride ceramic microspheres

Abstract

The invention discloses a technology for preparing zirconium nitride ceramic microspheres and the zirconium nitride ceramic microspheres, wherein the technology comprises the following steps: mixing ZrO(NO3)2*xH2O, hexamethylenetetramine, urea, concentrated HNO3 with carbon black to obtain a glue solution; dispersing the glue solution into hot silicone oil dropwise, solidifying droplets in the silicone oil to obtain gel microspheres; aging the gel microspheres in the hot silicone oil to react the gel microspheres completely; washing the gel microspheres to remove the silicone oil on the surface of the microspheres and residual unreacted materials; drying the washed gel microspheres to obtain dried gel microspheres; subjecting the dried gel microspheres to carbon thermal nitridation treatment, and sintering and densifying simultaneously to obtain the zirconium nitride ceramic microspheres. According the technology, the zirconium nitride ceramic microspheres are produced by combining aninternal gel method with a carbon thermal nitridation method, the obtained zirconium nitride ceramic microspheres are pure phase zirconium nitride, and the microspheres have good sphericity, uniform size, complete structure without cracks, and good mechanical properties.

Description

technical field [0001] The invention relates to the technical field of ceramic technology, in particular to a process for preparing zirconium nitride ceramic microspheres and the zirconium nitride ceramic microspheres. Background technique [0002] Zirconium nitride (ZrN) has the advantages of high melting point, high hardness, good chemical stability, low neutron capture cross section and high thermal conductivity, etc. It is a very promising inert matrix material for nuclear fuel. [0003] At present, there are many related reports on the preparation of zirconium nitride powders and bulk materials, but there is no patent report on the preparation of zirconium nitride ceramic microspheres. The existing preparation technology of zirconium nitride powder and bulk material cannot be directly applied to the preparation of zirconium nitride ceramic microspheres due to the characteristics of the technology itself. In addition, the existing nitriding process mostly uses NH 3 or ...

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Problems solved by technology

[0003] At present, there are many related reports on the preparation of zirconium nitride powder and bulk materials, but there is no patent report on the preparation of zirconium nitride ceramic microspheres

The existing preparation process of zirconium nitride powder and bulk material cannot be directly applied to the preparation of zirconium nitride ceramic microspheres due to the characteristics of the process itself.

In addition, the existing nitriding process mostly uses NH 3 or N 2 -H 2 Mixed gas is used as a nitrogen source for nitriding reaction, which has certain dangers

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