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Method for producing globular casting tungsten carbide powder by atomising

A technology of casting tungsten carbide and tungsten carbide powder, which is applied in the direction of carbide, tungsten/molybdenum carbide, etc., can solve the problems of large influence on the quality of cooling plate rotation speed, low spheroidization rate, complex production process, etc., and achieve product quality Good quality and spheroidizing effect, good fluidity and filling performance, and convenient operation and control

Inactive Publication Date: 2004-04-14
ZIGONG CEMENTED CARBIDE CORP +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has the advantages of short process flow, stable product composition, fine grain, high hardness, and good fluidity, it has good performance in spray welding and surfacing; its comprehensive performance is obviously better than that of traditional Casting WC powder produced by the method; but the material and rotation speed of the cooling plate have a great influence on the quality of the product, and it is difficult to effectively adjust and control, the spheroidization efficiency is low, the uniformity of the product particle size is poor, and it is difficult to produce 200 Defects such as fine powder below the mesh
[0004] Therefore, the above-mentioned production method exists or the production process is complex, the product quality and stability are poor, the production cost is high, the fluidity and filling property of the product are poor when used for spray welding or surfacing welding, and the reinforcing effect on the metal surface is poor; or the production equipment is damaged. Defects such as high performance requirements, difficult process control, low spheroidization rate, poor product particle size uniformity, and difficulty in producing spherical fine powder below 200 mesh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In this example, tungsten carbide powder with a total weight of 40% and metal tungsten powder with a weight of 60% are used to prepare a mixed powder, and the particle size of the powder is ≤30 μm; the WC powder contains C: 6.0%, free C: 0.2%, Fe: 0.1%, Cr: 0.05%, V: 0.02%, Si: 0.02%, Ti: 0.05%, MO+CO+Ni: 0.1%; the contents (wt%) of the following elements in metal W powder are Fe: 0.5 , Cr: 0.3, V: 0.02, Si: 0.02, Ti: 0.05, MO+CO+Ni: 0.5;

[0015] In this embodiment, a double intermediate frequency graphite tube furnace is used as the melting furnace. The length of the furnace tube of the melting furnace is 1600mm, the inner diameter of the furnace tube is φ35mm, the diameter of the lower beam hole is φ10mm, the diameter of the inner nozzle is φ30mm, and the outer nozzle is an annular slit nozzle with an inner diameter of φ35mm. Diameter φ36mm, atomization gas adopts argon, pressure 1.5MPa, flow rate 0.25kg / s; intermediate frequency power supply frequency 1800HZ, power ...

Embodiment 2

[0018] In this embodiment, the production of -325 mesh spherical cast tungsten carbide powder is taken as an example. The preparation of raw materials and mixed powder and the melting furnace are the same as in Embodiment 1.

[0019] In this embodiment, the feeding rate during smelting is 10 kg / hour, the protective gas argon pressure is 0.12 MPa; the atomizing gas pressure is 3.0 MPa, and the flow rate is 0.40 kg / second. The molten melt is output from the inner nozzle in the form of melt droplets and is atomized into spherical fine powder under the action of the powerful inert gas flow from the outer nozzle; after passing through a 325 mesh sieve, the sieved product is -325 mesh spherical Cast tungsten carbide products.

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Abstract

The invention discloses a kind of spheric casting tungsten-carbide powder with atomization forming method, it includes batch, smelting, atomization forming, sifting. Because that it melts the materials under the protection of inert gas in sealed condition and atomization forms into spheric powder by high pressure, strong inert gas, the craft flow is short. The operation is convenient, the product has a very good quality and high rigidity, the cost is decreased.

Description

technical field [0001] The invention belongs to a method for producing cemented carbide powder (powder), in particular to a method for producing spherical cast tungsten carbide powder by atomization forming. The spherical cast tungsten carbide powder produced by this method can be widely used in the reinforcement treatment of the surface of metal parts with high performance requirements such as wear resistance. Background technique [0002] Spherical cast tungsten carbide (WC) powder is widely used in petroleum, geological , construction machinery and rolls, etc., to reinforce the metal surface of parts with high requirements for wear resistance and high temperature resistance, so as to effectively improve their working efficiency and service life. The traditional casting of WC powder is to mix WC and metal W (tungsten) powder in a graphite tube furnace or a tilting melting furnace. After melting in a furnace cavity with air, it is cooled into a fine dendritic alloy block i...

Claims

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Application Information

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IPC IPC(8): B22F9/08C01B32/949
Inventor 颜维戴煜羊建高王利民李玉玺李伟勤李睿
Owner ZIGONG CEMENTED CARBIDE CORP
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