A kind of preparation method of superfine niobium carbide powder

A technology of niobium carbide and powder, applied in the direction of nanotechnology, can solve the problems of high carbonization temperature, low activity, agglomeration, etc., and achieve the effect of low carbonization temperature, low investment and small particle size

Active Publication Date: 2011-12-14
长沙伟徽高科技新材料有限公司
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Problems solved by technology

If the NbC powder grains are coarse, the activity is low, the diffusion speed is slow, and the agglomeration phenomenon is serious during the alloy sintering process, which makes it difficult to meet the increasingly higher requirements of cemented carbide.
[0004] The traditional method of preparing NbC powder is to mix common Nb 2 o 5 The powder is mixed with solid carbon ball mill, carbonized once in carbon tube furnace or carbonized once in carbon tube furnace and twice in vacuum furnace. About 1~3μm

Method used

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  • A kind of preparation method of superfine niobium carbide powder

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Effect test

Embodiment 1

[0025] After compressing the slurry-like niobium hydroxide obtained by purchasing and drying at 200°C in an oven, 38 kilograms of nano-scale niobium hydroxide were obtained, and then 38 kilograms of niobium hydroxide were mixed with 8.74 kilograms of carbon black, and slowly 3 The temperature was raised to 1300° C. for 1 hour, and the high temperature holding time was 11 hours. When the vacuum degree reached 10 Pa, the carbonization was terminated. Cool with H2 for 14 hours. Ball mill after discharge. The particle size of the Fsss sample was measured to be 0.74 μm, and the chemical composition met the requirements. The specific composition is shown in Table 1.

Embodiment 2

[0027] After compressing the slurry-like niobium hydroxide obtained by purchasing and drying at 220°C in an oven, 48 kilograms of nano-scale niobium hydroxide were obtained, and then 48 kilograms of niobium hydroxide were mixed with 10.94 kilograms of carbon black. The temperature was raised to 1310° C., and the high temperature holding time was 13 hours. When the vacuum reached 12 Pa, the carbonization was completed. Pass H2 to cool, and the cooling time is 15 hours. Ball mill after discharge. The particle size of the Fsss sample was measured to be 0.76 μm, and the chemical composition met the requirements. The specific composition is shown in Table 1.

[0028] Table 1 Composition index of ultrafine NbC

[0029]

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Abstract

Belonging to the field of new material preparation, the invention specifically provides a preparation method of superfine niobium carbide powder. The method comprises the steps of: a. drying the compressed slurry niobium hydroxide at a temperature of 180-250DEG C for 6h-12h so as to remove moisture, thus obtaining niobium hydroxide powder with a granule size of 20nm-90nm; b. mixing the niobium hydroxide powder and carbon black uniformly in a mass ratio of 1:0.225-0.235, conducting carbonization in a vacuum furnace, with the carbonization temperature controlled from 1280DEG C to 1350DEG C, carrying out vacuum-pumping continuously, ending the carbonization process when the vacuum degree reaches 10Pa-12Pa, then conducting cooling for 12h-16h, and performing ball milling after discharging, thus obtaining the niobium carbide powder with a Fsss granule size less than 0.8micrometer. With low carbonization temperature and simple and easily realizable operation process, the method provided in the invention can prepare niobium carbide powder of small granule size.

Description

technical field [0001] The invention belongs to the field of new material preparation, and adopts a method combining low-temperature drying and vacuum smelting to prepare superfine niobium carbide powder. Background technique [0002] The main application field of NbC is cemented carbide inserts. One of its functions: as a cemented carbide grain growth inhibitor, after adding NbC, it can prevent the growth of grains in the cemented carbide sintering process; its second function is Together with TiC, it forms the third dispersed phase except WC and Co, which significantly increases the thermal shock resistance, hot compression and oxidation resistance of cemented carbide and improves the hot hardness of cemented carbide. [0003] Due to the continuous improvement of application requirements and the harsh application environment, the metallographic structure of cemented carbide is more uniform and finer, which puts forward higher requirements for the particle size and uniformi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30B82Y40/00
Inventor 郭伟
Owner 长沙伟徽高科技新材料有限公司
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