Method for preparing micro-fine and nanometer particle tungsten carbide

A nanoparticle and tungsten carbide technology, which is applied in the direction of nanostructure manufacturing, carbide, nanotechnology, etc., can solve the problems of uneven particle size distribution, poor product stability, and unstable quality, and achieve uniform particle size distribution and product stability. Good performance and the effect of improving labor efficiency

Inactive Publication Date: 2010-01-27
南昌硬质合金有限责任公司
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tungsten carbide powder produced by this method has many unbroken or agglomerated particles, the particle size distribution is not uniform and concentrated, some impurities are high, and the single batch

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The present invention is realized in this way, by weight 1000kg, tungsten powder with particle size not greater than 150nm and carbon black accounting for 6.15% of the total weight are mixed and mixed with carbon for 40 minutes and then loaded into a boat. Hydrogen molybdenum wire furnace carbonization, at the same time control the flow of hydrogen through the hydrogen molybdenum wire furnace to 2.0m 3 / h, the temperature in the furnace is 1100°C, and then crushed by the airflow crushing system, and the crushing pressure is 0.7MPa.

Embodiment 2

[0010] The present invention is realized like this, by weight 1500kg particle size is the tungsten powder of 150-250nm and accounts for 6.20% carbon black of total weight and mixes carbon black and carries out boat loading after 20min, and boat load is 5kg, and the speed of pushing boat is 7min / boat passes through Carbonization in a hydrogen molybdenum wire furnace, while controlling the hydrogen flow rate of the hydrogen molybdenum wire furnace to 2.0m 3 / h, the temperature in the furnace is 1200°C, and then crushed by the airflow crushing system, and the crushing pressure is 0.7MPa.

Embodiment 3

[0012] The present invention is realized like this, by weight 800kg particle size is the tungsten powder of 250-500nm and accounts for 6.10% carbon black of total weight and mixes carbon black and carries out boat loading after 30min, and boat load is 7kg, and the speed of pushing boat is 6min / boat passes through Carbonization in a hydrogen molybdenum wire furnace, while controlling the hydrogen flow rate of the hydrogen molybdenum wire furnace to 2.0m 3 / h, the temperature in the furnace is 1250°C, and then crushed by the airflow crushing system, and the crushing pressure is 0.7MPa.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Granularityaaaaaaaaaa
Login to view more

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 [0001] The invention relates to a preparation method of tungsten carbide, in particular to a preparation method of fine and nano particle tungsten carbide which improves labor efficiency and output rate. Background technique [0002] The nanoscale, ultrafine and microparticle tungsten carbide powders commonly produced in the market are mixed with carbon black and carbon black respectively, usually for 3 to 6 hours, and sometimes various additives are added. It is produced by carbonization equipment such as carbon tube furnace or molybdenum wire furnace, and then crushed with a ball mill, usually for 3 to 6 hours, and then sieved to obtain fine tungsten carbide powder products. The tungsten carbide powder produced by this method has many unbroken or agglomerated particles, the particle size distribution is not uniform and concentrated, some impurities are high, and the single batch of large-scale production is small, generally 200-300kg, and the product is sta...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B31/34B82B3/00C01B32/949
Inventor 雷纯鹏郝立伟蔡旦瑜危金生肖晗洪清华刘发辉洪小虎钟毓斌胡化文
Owner 南昌硬质合金有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap