Method for producing WC-Fe composite powder of ultra fine grain by tungsten alloy scrap

An ultra-fine grain, tungsten alloy technology, applied in the field of powder metallurgy, can solve the problems of uniform mixing of elemental refractory composite powder, reducing the metallographic uniformity of cemented carbide products, and difficult to maintain consistent grain size, and achieve advanced technology. , The effect of uniform grain, high strength and hardness

Inactive Publication Date: 2004-03-31
ZIGONG CEMENTED CARBIDE CORP +1
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Problems solved by technology

Since this method is directly reduced under hydrogen or carbon monoxide atmosphere after oxidation roasting and ball milling, and then carbonized, it can only produce sub-fine tungsten carbide cobalt composite powder with a grain size of 0.5-1.0 μm, and cannot produce ultra-fine Composite powder; the second is for the production of cemented carbide. The alloy composition can only be adjusted in the wet grinding stage of the cemented carbide production process. At this time, the added elements are difficult to mix evenly with the original composite powder, and the grain size is not easy to maintain. In addition, each element is added in the form of a single phase component, which also reduces the metallographic uniformity of the produced cemented carbide products, and can only produce sub-fine-grained hard alloys with a grain size of 0.6-0.8 μm. Alloy products

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  • Method for producing WC-Fe composite powder of ultra fine grain by tungsten alloy scrap

Examples

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Embodiment 1

[0016] In this embodiment, the waste hard alloy top hammer (containing WC: 92%, cobalt about 8%) is recycled to produce 10% cobalt-containing ultra-fine grained tungsten carbide-cobalt composite powder as an example:

[0017] A. Oxidation roasting: Put 2000g of the waste cemented carbide top hammer crushed to <50mm and washed to remove impurities in a heat-resistant alloy steel boat, and then sent to the oxidation furnace. Roasted for 5 hours under the condition of air mixed gas, 2254g of cobalt tungstate-tungsten trioxide mixture is obtained (about 90g of unoxidized waste cemented carbide residue is removed); the mixed gas flow rate: air 500L / hour, oxygen 150L / hour;

[0018] B. Crushing and grinding: After crushing the obtained 2254g mixture block material to less than 5mm, place it in a ball mill, add 12kg cemented carbide balls, and grind into a powder that has passed through a 40 mesh sieve.

[0019] C. Wet grinding ingredients: Put the above powder together with 14.3g of van...

Embodiment 2

[0025] In this embodiment, 1000 g of high-density tungsten alloy waste containing 92% W, approximately 8.0% of nickel and iron is used as raw material to produce ultrafine tungsten carbide-nickel and iron composite powder containing 10.0% of nickel and iron as an example:

[0026] A. Oxidation roasting and B pulverization and grinding are the same as in Example 1, to obtain 1240 g of nickel tungstate, iron tungstate-tungsten trioxide composite powder;

[0027] C. Wet milling ingredients: the above composite powder together with 72g of nickel oxalate, 8.0g of vanadium oxide, 5.0g of chromium oxide, and 98g of carbon black powder are sent to a ball mill for 66 hours of wet milling, and then dried for use;

[0028] D. The reduction treatment is also the same as in Example 1;

[0029] E. Carbon preparation: send the powder obtained from the reduction treatment together with 33.5g of carbon black powder into the ball mill for 72 hours of wet grinding, and then dry for use;

[0030] The...

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Abstract

A method of producing a superfine composite powder with tungsen carbon-element belong to iron group. It comprises: pulverizing the waste material containing tungsen, oxidizing and baking, grinding, wet grinding and mixing, reducing, adding carbon and carbonizing, then obtaining the superfine composite powder with tungsen carbon-element belong to iron group. It is characterized in, before reducing, adding carbon black powder, adjusting tungen and / or element of iron group, forming superfine WxCy compounds, adding some vanadium and chromium to prevent crystals from expanding.

Description

Technical field [0001] The invention belongs to a method for producing ultrafine-grained tungsten carbide-iron-based composite powder by using tungsten-containing alloy waste in the field of powder metallurgy. The composite powder produced by this method can be directly used to manufacture high-performance superfine cemented carbide. Background technique [0002] In the patent document with the patent number ZL91107165.2 and the invention titled "Cemented Carbide Scrap Recovery Treatment Method", the applicant disclosed a recycling treatment method that crushed, cleaned, roasted tungsten-containing waste alloy, in hydrogen or After reduction treatment, carbon addition and carbonization treatment under a carbon monoxide atmosphere, ball milling and sieving are carried out to obtain sub-fine tungsten carbide-cobalt composite powder with a grain size of 0.6-1.0 μm. This method is directly reduced in hydrogen or carbon monoxide atmosphere after oxidative roasting, ball milling, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C22B7/00C22C29/08
CPCY02P10/20
Inventor 李家杰郑直羊建高谭竹峰
Owner ZIGONG CEMENTED CARBIDE CORP
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