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Process for preparing nm-class superfine vanadium carbide powder

A nano-scale, vanadium carbide technology, which is applied in the field of carbide powder preparation, can solve the problems that cannot meet the production requirements of ultra-fine grains, and achieve the effects of narrow particle size distribution, increased carbonization reaction speed, and uniform particles

Inactive Publication Date: 2006-01-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, it cannot meet the production requirements of ultra-fine grains.

Method used

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  • Process for preparing nm-class superfine vanadium carbide powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: When preparing 1kg nano (VC) powder, complete according to the following steps.

[0034] 1. Preparation of NH 4 VO 3 aqueous solution

[0035] Weigh 1.864kg NH 4 VO 3 powder by NH 4 VO 3 :H 2 The mass ratio of O=1:46 was added to 85.74Kg of distilled water, heated to 85°C, and stirred. Make it fully dissolved and prepare 87.6Kg NH 4 VO 3 Aqueous solution (dispensing into small jars is permitted).

[0036] 2. Ultrasonic spray thermal conversion preparation V 2 o 5 Precursor powder.

[0037] In the ultrasonic spray heat conversion tower, the (NH 4 VO 3 ) aqueous solution, pour it into an atomization tank with heat preservation at 85°C, and carry out ultrasonic spray conversion powder production. The atomization process parameters are jet (air) pressure 2.0MPa, nozzle angle α=30°, liquid flow rate 195ml / min, and hot air temperature 120°C , can get nanoscale ultrafine (V 2 o 5 ) precursor powder.

[0038] 3. Roasting (V 2 o 5 ) precursor po...

Embodiment 2

[0055] Embodiment 2: When preparing 10kg nanometer (VC) vanadium carbide powder, complete according to the following steps.

[0056] 1. Preparation of NH 4 VO 3 aqueous solution

[0057] Weigh 18.64kg NH 4 VO 3 Powder, by NH 4 VO 3 :H 2 Add O=1:46 mass ratio 3 into 857.4Kg distilled water, heat to 90°C, and stir. Make it fully dissolved and prepare 876.4KgNH 4 VO 3 Aqueous solution (sub-package into small tanks is allowed).

[0058] 2. Ultrasonic spray thermal conversion preparation V 2 o 5 Precursor powder.

[0059] In the ultrasonic spray heat conversion tower, the (NH 4 VO 3 ) ammonium metavanadate aqueous solution, pour it into an atomization tank with a heat preservation temperature of 90°C, and perform ultrasonic spray conversion. With a flow rate of 205ml / min, nano-scale ultra-fine (V 2 o 5 ) precursor powder.

[0060] 3. Roasting (V 2 o 5 ) precursor powder

[0061] In a stainless steel tube furnace, the V 2 o 5 V 2 o 5 Nanoscale microcrystalli...

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Abstract

The invention disclose a process for preparing nm-class superfine vanadium carbide powder which comprises, preparing nano level V2O5 precursor powder by means of supersonic spraying thermal conversion method, sintering, and mixing in shearing machine, obtaining ultra-fine vanadium carbide powder in stainless steel pipe type carbide furnace at 850-980 for 60-80 minutes at the presence of H2 protection, squashing the bridge joint granules with a shearing crusher, drying to obtain the ultra-fine vanadium carbide powder with average grain diameter <0.1 um.

Description

technical field [0001] The invention belongs to the technical field of carbide powder preparation in cermet materials. In particular, it provides a preparation method of nanometer superfine vanadium carbide (VC) powder. It is suitable for industrial production of nano-scale VC powder. Background technique [0002] With the rapid development of modern high-tech, higher requirements have been put forward for the output and quality of cemented carbide materials. According to relevant literature, the annual output of cemented carbide in the world has exceeded 30,000 tons, and the annual output of cemented carbide in my country has exceeded 30,000 tons. Up to 7800 tons, pure tungsten metal products about 1000-1200 tons, ranking first in the world. my country is a big country producing tungsten, rich in tungsten ore resources, and more than 20,000 tons of crude tungsten products are exported every year, but the quality of cemented carbide in my country is inferior to that of Swed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/30
Inventor 吴成义张丽英
Owner UNIV OF SCI & TECH BEIJING
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