CN101633502A - Method for preparing micro-fine and nanometer particle tungsten carbide - Google Patents
Method for preparing micro-fine and nanometer particle tungsten carbide Download PDFInfo
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- CN101633502A CN101633502A CN200910115955A CN200910115955A CN101633502A CN 101633502 A CN101633502 A CN 101633502A CN 200910115955 A CN200910115955 A CN 200910115955A CN 200910115955 A CN200910115955 A CN 200910115955A CN 101633502 A CN101633502 A CN 101633502A
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Abstract
The invention relates to a method for preparing micro-fine and nanometer particle tungsten carbide. The method is characterized by comprising the following steps: mixing 800-2500 kg of tungsten powder by weight with carbon black accounting for 5.90-6.3 percent of the total weight, charging into a boat after blending carbon for 20-60 min, wherein the boat charging amount is 3-7 kg and the boat pushing speed is 6-10 min/boat, and then carbonizing through a hydrogen infusing molybdenum wire furnace, simultaneously controlling the hydrogen flow of the hydrogen infusing molybdenum wire furnace to be 1.0-2.5 m<3>/h, wherein the temperature inside the furnace is 1100-1350 DEG C, and then crushing the tungsten carbide block by using an air stream crushing system and dispersing into tungsten carbide powder. The invention has the following advantages: firstly, the method shortens the production time and controls the production process more stably; secondly, the little uncrushed or aggregate particles exist in the prepared tungsten carbide powder is very, and the granularity distribution is centralized uniformly; thirdly, single batch 800-2500 kg of scale production can be adjusted, the single batch is larger, and the product has better stability; and fourthly, the method is used for producing high-performance nanometer crystal, super-fine crystal and micro-fine crystal hard alloy with prior quality, and controls the alloy production process stably.
Description
Technical field
The present invention relates to a kind of preparation method of wolfram varbide, relate in particular to a kind of raising labour efficiency and the preparation method of the fine and nanometer particle tungsten carbide of output capacity.
Background technology
Nano level, the ultra-fine and subparticle tungsten carbide powder generally produced on the current market, be after using nanometer, ultra-fine and fine tungsten powder to mix respectively to join carbon with carbon black, general 3～6 hours, sometimes add various additives, through carbonizing apparatus productions such as carbon tube furnace or molybdenum wire furnaces, use the ball mill fragmentation afterwards, general 3～6 hours, obtain fine tungsten carbide powder product after sieve.There is the particle of more fully broken or coacervate in the tungsten carbide powder that this kind method is produced, and size-grade distribution is evenly concentrated inadequately, and partial impurities content is higher, and large-scale production is single less in batches, is generally 200-300kg, and product stability is relatively poor.Produce high performance nano-crystal, ultra-fine crystalline substance and fine cemented carbide, the quality instability.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of fine and nanometer particle tungsten carbide, reduce the particle of fully not broken or coacervate by this preparation method, make the size-grade distribution of tungsten carbide powder more evenly concentrate, reduce Fe, Co, foreign matter contents such as Ni, Cr, improve single batch products weight, to improve the stability of product.
The present invention is achieved like this, it is characterized in that by weight the 800kg-2500kg tungsten powder and account for gross weight 5.90%-6.3% carbon black and mix and join the laggard luggage boat of carbon 20-60min, boat charge is 3-7kg, push away boat speed and pass through logical hydrogen molybdenum wire furnace carbonization for the 6-10min/ boat, the hydrogen flowing quantity of the logical hydrogen molybdenum wire furnace of control is 1.0-2.5m3/h simultaneously, temperature is dispersed into tungsten-carbide powder through the airflow crash system with the tungsten carbide slug fragmentation again and gets final product at 1100-1350 ℃ in the stove.
The fine tungsten powder that ultrafine tungsten powder that tungsten powder of the present invention is the granularity nano-tungsten powder that is not more than 150nm, granularity is 150-250nm or granularity are 250-500nm.
Advantage of the present invention is: 1, shortened the production time, improved efficiency and first product output capacity, controlling of production process is more stable; 2, the wolfram varbide powder of preparation particle fully broken or coacervate is few, and size-grade distribution is very evenly concentrated; 3, foreign matter contents such as Fe, Co, Ni, Cr are lower, and the single 800kg-2500kg in batches of large-scale production can adjust, and single bigger in batches, product stability is better; 4, be used to produce high performance nano-crystal, ultra-fine crystalline substance and fine cemented carbide, Functionality, quality and appealing design, the alloy production technology controlling and process is stable.
Embodiment
Embodiment one
The present invention is achieved like this, by weight the 1000kg granularity tungsten powder that is not more than 150nm with account for gross weight 6.15% carbon black and mix and join the laggard luggage boat of carbon 40min, boat charge is 3kg, push away boat speed and pass through logical hydrogen molybdenum wire furnace carbonization for the 8min/ boat, the hydrogen flowing quantity of the logical hydrogen molybdenum wire furnace of control is 2.0m simultaneously
3Temperature is at 1100 ℃ in the/h, stove, and by the fragmentation of airflow crash system, cracking pressure 0.7MPa gets final product again.
Embodiment two
The present invention is achieved like this, by weight the 1500kg granularity be 150-250nm tungsten powder with account for gross weight 6.20% carbon black and mix and join the laggard luggage boat of carbon 20min, boat charge is 5kg, push away boat speed and pass through logical hydrogen molybdenum wire furnace carbonization for the 7min/ boat, the hydrogen flowing quantity of the logical hydrogen molybdenum wire furnace of control is 2.0m simultaneously
3Temperature is at 1200 ℃ in the/h, stove, and by the fragmentation of airflow crash system, cracking pressure 0.7MPa gets final product again.
Embodiment three
The present invention is achieved like this, by weight the 800kg granularity be 250-500nm tungsten powder with account for gross weight 6.10% carbon black and mix and join the laggard luggage boat of carbon 30min, boat charge is 7kg, pushes away boat speed and passes through logical hydrogen molybdenum wire furnace carbonization for the 6min/ boat, and the hydrogen flowing quantity of the logical hydrogen molybdenum wire furnace of control is 2.0m simultaneously
3Temperature is at 1250 ℃ in the/h, stove, and by the fragmentation of airflow crash system, cracking pressure 0.7MPa gets final product again.
Embodiment four
The present invention is achieved like this, by weight the 2500kg granularity be 250-500nm tungsten powder with account for gross weight 6.20% carbon black and mix and join the laggard luggage boat of carbon 40min, boat charge is 7kg, push away boat speed and pass through logical hydrogen molybdenum wire furnace carbonization for the 8min/ boat, the hydrogen flowing quantity of the logical hydrogen molybdenum wire furnace of control is 1.0m simultaneously
3Temperature is at 1350 ℃ in the/h, stove, and by the fragmentation of airflow crash system, cracking pressure 0.7MPa gets final product again.
Claims (2)
1, a kind of preparation method of fine and nanometer particle tungsten carbide, it is characterized in that by weight the 800kg-2500kg tungsten powder and account for gross weight 5.90%-6.3% carbon black and mix and join the laggard luggage boat of carbon 20-60min, boat charge is 3-7kg, push away boat speed and pass through logical hydrogen molybdenum wire furnace carbonization for the 6-10min/ boat, the hydrogen flowing quantity of the logical hydrogen molybdenum wire furnace of control is 1.0-2.5m simultaneously
3Temperature is dispersed into tungsten-carbide powder through the airflow crash system with the tungsten carbide slug fragmentation again and gets final product at 1100-1350 ℃ in the/h, stove.
2, the preparation method of fine and nanometer particle tungsten carbide according to claim 1 is characterized in that the fine tungsten powder that described tungsten powder is the granularity nano-tungsten powder that is not more than 150nm, granularity is 150-250nm ultrafine tungsten powder or granularity are 250-500nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910115955A CN101633502A (en) | 2009-08-13 | 2009-08-13 | Method for preparing micro-fine and nanometer particle tungsten carbide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910115955A CN101633502A (en) | 2009-08-13 | 2009-08-13 | Method for preparing micro-fine and nanometer particle tungsten carbide |
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| CN101633502A true CN101633502A (en) | 2010-01-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106185944A (en) * | 2016-07-01 | 2016-12-07 | 南昌大学 | A kind of method preparing superfine tungsten carbide containing arsenic and the ammonium paratungstate of phosphorus or ammonium metatungstate |
| CN106350721A (en) * | 2016-09-05 | 2017-01-25 | 中南大学 | Preparation method of high-performance WC-Co cemented carbide of plate-like grain structure |
| CN114906851A (en) * | 2022-04-20 | 2022-08-16 | 崇义章源钨业股份有限公司 | Preparation method of nano tungsten carbide with high specific surface area |
-
2009
- 2009-08-13 CN CN200910115955A patent/CN101633502A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106185944A (en) * | 2016-07-01 | 2016-12-07 | 南昌大学 | A kind of method preparing superfine tungsten carbide containing arsenic and the ammonium paratungstate of phosphorus or ammonium metatungstate |
| CN106185944B (en) * | 2016-07-01 | 2018-01-19 | 南昌大学 | The method that a kind of ammonium paratungstate or ammonium metatungstate containing arsenic and phosphorus prepare superfine tungsten carbide |
| CN106350721A (en) * | 2016-09-05 | 2017-01-25 | 中南大学 | Preparation method of high-performance WC-Co cemented carbide of plate-like grain structure |
| CN106350721B (en) * | 2016-09-05 | 2018-06-29 | 中南大学 | A kind of preparation method of plate crystal structure high-performance WC-Co hard alloy |
| CN114906851A (en) * | 2022-04-20 | 2022-08-16 | 崇义章源钨业股份有限公司 | Preparation method of nano tungsten carbide with high specific surface area |
| CN114906851B (en) * | 2022-04-20 | 2023-09-19 | 崇义章源钨业股份有限公司 | Preparation method of nano tungsten carbide with high specific surface area |
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