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A kind of high-purity cerium nitride powder and its preparation method and application

A cerium nitride and powder technology, which is applied in the field of high-purity cerium nitride powder and its preparation, can solve the problems of low purity of CeN powder, complicated process and high equipment requirements, and achieves low cost, simple process and equipment requirements. low effect

Active Publication Date: 2018-09-11
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-purity cerium nitride powder and its preparation method and application, so as to solve the problems of low purity, complex process and high equipment requirements of the CeN powder prepared in the prior art

Method used

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  • A kind of high-purity cerium nitride powder and its preparation method and application
  • A kind of high-purity cerium nitride powder and its preparation method and application
  • A kind of high-purity cerium nitride powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, in an oxygen-free environment, mix Ce powder and absolute ethanol according to the solid-to-liquid ratio of 1g:5ml and put them in a 2L container, then mix them on a ball mill (parameters set to 11Hz) for 6 hours, and dry them naturally for use; weigh the above 100g of Ce powder is used, and 5g of NH 4 Cl powder, 10g NH 4 F powder, 7g anhydrous CeCl 3 Powder is used as an auxiliary agent, and 3g CeN powder is weighed as an additive; the weighed Ce powder and NH 4 Cl powder, NH 4 F powder is placed in a corundum mortar and mixed evenly, the mixing time is not less than 0.5h, and the whole mixing process needs to be carried out in an inert gas environment. Spread the mixed raw materials in a molybdenum crucible, and put the crucible into a sintering furnace. H is introduced into the sintering furnace 2 As the reaction atmosphere, the temperature was raised to 400°C at a rate of 10°C / min, and the flow rate was controlled at 1L / min to keep warm at 400°C. Natura...

Embodiment 2-30

[0035] Change the ratio of auxiliary agents and additives, or change the sintering conditions, other process parameters are the same as in Example 1, the results obtained are shown in Table 1.

[0036] Table 1:

[0037]

[0038]

[0039] It can be seen from Table 1 that the purity of cerium nitride has relatively fine requirements on the sintering process. Among them, the pretreatment of metal Ce powder, additive CeN powder, and additive anhydrous CeCl 3 Adding greatly improved the purity of the final product, and the final results were better than the comparative examples.

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Abstract

The invention provides high-purity cerium nitride powder. The content of CeN in the powder is greater than or equal to 93.7 weight percent, and the content of N is greater than or equal to 8.51 weight percent. A preparation method of the high-purity cerium nitride powder comprises the following steps: pretreating Ce powder of which the purity is 99 weight percent, and then uniformly mixing the pretreated Ce powder with an assistant; sintering in a specific reaction atmosphere, sufficiently grinding a sintered product, and then mixing the ground sintered product with the assistant and an additive for secondary sintering; finally, carrying out surface treatment on obtained cerium nitride powder. The high-purity cerium nitride powder provided by the invention can be applied to preparation of high-performance ceramic, semiconductor materials and luminous materials. The method provided by the invention is simple in process and lower in cost, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of material science, in particular to a high-purity cerium nitride powder and its preparation method and application. Background technique [0002] Known as "industrial vitamins", rare earths are extremely important strategic resources and are widely used in petroleum, chemical industry, metallurgy, textile, ceramics, glass, permanent magnet materials and other fields. Therefore, the research on rare earth compounds is very important. [0003] Cerium nitride can be used to make various inorganic composite materials, such as high-performance ceramics, semiconductor materials, luminescent materials, etc., and the preparation of these materials has extremely high requirements on the purity of cerium nitride. [0004] At present, in the preparation methods of cerium nitride, the high-temperature solid phase direct nitriding method is the main method. The advantage of this method is that the process is simple, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/06
CPCC01B21/0627C01P2002/72C01P2004/03C01P2004/61C01P2006/80
Inventor 杨志平路亚娟刘通赵金鑫
Owner HEBEI LIFU CHEM TECH