CN103255333A - Rare-earth modified tungsten hard alloy and preparation method thereof - Google Patents

Abstract

The invention discloses a rare-earth modified tungsten hard alloy and a preparation method thereof. The rare-earth modified tungsten hard alloy is prepared by taking tungsten carbide, cobalt powder, vanadium carbide, chromium carbide, tantalum carbide, titanium carbide, rhenium powder, copper nitrate and yttrium oxide as raw materials through the steps such as powder preparation through atomization, alcohol mixing, wet type ball milling, normal-temperature static pressing, paraffin sizing, sintering in sections by using various excellent processes. The quality of the hard alloy is greatly improved, the production cost and consumption are reduced, the production efficiency is increased, and the rare-earth modified tungsten hard alloy is energy-saving and environment-friendly.

Description

A kind of rare earth modified tungsten Wimet and preparation method thereof

Technical field

The present invention relates to the preparation field of Wimet, relate in particular to a kind of rare earth modified tungsten Wimet and preparation method thereof.

Background technology

Tungsten-bast alloy is a kind of to be the hard phase with tungsten, serves as the composite wood section that bonding constitutes mutually with nickel, copper or nickel, iron etc.Tungsten-bast alloy is good owing to its density height, intensity height, ductility, good toughness, thermal expansivity are little etc., and a series of excellent specific properties are widely used in fields such as information, the energy, metallurgy, aerospace, defence and military and nuclear industry.After entering 21 century, along with science and technology development, tungsten alloy material is not only in fields such as defence and military, aerospace performance more important role, simultaneously, consumption in electronic information, environment, the energy and power machine also will promote significantly, and expectation will increase by 2 ~ 3 times.Along with the fast development of industries such as information, the energy, environment, defence and military, higher more requirement has been proposed for the performance of material.Therefore, the over-all properties how to improve current material on existing basis has become the matter of utmost importance that material supplier author pays close attention to.

In the CEMENTED CARBIDE PRODUCTION technology, be raw material with wolfram varbide and cobalt powder mainly, with the form moulding of mixing glue or mixing wax.Carrying out high temperature sintering more than 1200 ℃.Since the granularity factor of wolfram varbide and cobalt powder, and wolfram varbide is different with the proportioning of cobalt powder, and the Wimet performance that sintering comes out also differs greatly.Therefore, the Wimet trade mark is also different.Owing to the related application of this hart metal product is many and wide, high speed development along with infant industry, the Application Areas of the Wimet of this being called as " industrial tooth " is also more and more wider, and performance requriements more and more trends towards high strength, high rigidity and high temperature resistant three-in-one body.

Summary of the invention

Technical problem solved by the invention is to provide a kind of rare earth modified tungsten Wimet and preparation method thereof, to solve the shortcoming in the above-mentioned background technology.

Technical problem solved by the invention realizes by the following technical solutions:

A kind of rare earth modified tungsten Wimet and preparation method thereof, the weight percent of its raw material is:

Tungsten carbide powder: 76.8%-82.8%,

Cobalt powder: 6%-20%,

Vanadium carbide: 0-0.3%,

Chromium carbide: 0.3%-1.0%,

Tantalum carbide: 0-1.0%,

Titanium carbide: 0-0.5%,

Rhenium powder: 0-0.02%,

Nickel powder: 0-0.5%,

Cupric nitrate: 5.3-7.0%,

Yttrium oxide: 2.7-3.2%.

In the present invention, the granularity of all raw materials is the 1000-1500 order.

A kind of preparation method of rare earth modified tungsten Wimet, its key step comprises:

(1) cupric nitrate is configured to 10 ~ 25% the aqueous solution, add tungsten carbide powder and yttrium oxide powder, being transported to atomizing nozzle atomizes, fine droplet after the atomizing sprays in the airtight high temperature reaction stove and reacts, provide the reduction atmosphere by excessive carbon in the Reaktionsofen, in Reaktionsofen temperature of reaction 800-1000 ℃;

(2) collect reacted material from the smoke outlet of Reaktionsofen, by after drip washing and the oven dry, collect powder material respectively, this moment, the material powder was the WC/Cu powdered alloy of rare earth element yttrium modification;

(3) will go up the powdered alloy that step obtains and mix with cobalt powder, vanadium carbide, chromium carbide, tantalum carbide, titanium carbide, rhenium powder, nickel powder, add the alcohol of capacity, and make to mix;

(4) mixture was carried out in ball mill wet ball-milling 4-24 hour, rotating speed is controlled at 50-150r/min, after the ball milling, the wet mixing material is changed in the double cone mixer mixed 1-2 hour, carries out alcohol and reclaims dry 1-2 hour then;

(5) powder material that last step is obtained carries out the normal temperature static pressure, static pressure 20-30min, pressure 100-300MPa;

(6) add paraffin setting agent and constantly stirring in material, adding the paraffin amount is the 4-10% of material, churning time 2-3h;

(7) material to the paraffin typing carries out sintering, the paraffin removal 3-5h when 250-500 ℃ of temperature of elder generation in sintering process, in 2-3h, be warming up to 1350 ℃ then, in 60-80min, be warming up to 1400 ℃, then at 1400 ℃ of first sintered heat insulating 60-80min, keep 30-80min during at 10MPa at pressure again, namely obtain product after the cooling.

Beneficial effect: the present invention has increased substantially the quality of Wimet by adopting multinomial technology, has reduced production cost and consumption, has improved production efficiency, energy-conserving and environment-protective.

Embodiment

For technique means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, giving an actual example below describes the present invention.

Prepare raw material according to proportioning raw materials and take by weighing wolfram varbide 7848g, cobalt powder 1000g, vanadium carbide 30g, chromium carbide 80g, tantalum carbide 70g, titanium carbide 50g, rhenium powder 2g, cupric nitrate 620g, yttrium oxide 30g.

Cupric nitrate is incorporated water be mixed with 15% solution, add tungsten carbide powder and yttrium oxide powder, the atomizing of concussion back, spray in the high temperature reaction stove, collecting reaction product, be that medium fully mixes with alcohol with product and vanadium carbide, cobalt powder, chromium carbide, tantalum carbide, titanium carbide, rhenium powder, and mixture dropped into ball mill carried out wet ball-milling 8 hours, rotating speed 110r/min; Behind the ball milling, batch mixing changed over to mix 1h in the double cone mixer, carry out alcohol and reclaim, dry 2 hours then, carry out the normal temperature static pressure and keep pressurization 30min, pressure 300MPa; In material, add paraffin setting agent 300g and constantly stir 3h, carry out sintering after the stirring, sintering process is earlier at 500 ℃ of paraffin removal 5h, in 2-3h, be warming up to 1350 ℃ again, in 80min, be warming up to 1400 ℃, keep 80min to carry out sintering, be forced into 10MPa then and keep 80min, cooling namely obtains the product Wimet.

In the present invention, described atomizing step of reaction, in the high temperature reaction stove by carbon provide one can quick response the reduction atmosphere, carbon can not only with raw material in water reaction produce more reducing gas, can also with the raw material wolfram varbide in carbon carry out exchange of substance, make the powder particle in this step reaction product littler, make end product quality better.

In the present invention, contain a large amount of reducing gass such as hydrogen, carbon monoxide etc. and dust in the tail gas of high temperature reaction stove, need purify and remove, with the quality of assurance product, and reduce it to the pollution of environment.

More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (3)

1. rare earth modified tungsten Wimet is characterized in that the weight percent of its raw material is:

Tungsten carbide powder: 76.8%-82.8%,

Cobalt powder: 6%-20%,

Vanadium carbide: 0-0.3%,

Chromium carbide: 0.3%-1.0%,

Tantalum carbide: 0-1.0%,

Titanium carbide: 0-0.5%,

Rhenium powder: 0-0.02%,

Nickel powder: 0-0.5%,

Cupric nitrate: 5.3-7.0%,

Yttrium oxide: 2.7-3.2%.

2. a kind of rare earth modified tungsten Wimet according to claim 1 is characterized in that the granularity of all raw materials is the 1000-1500 order.

3. the preparation method of a rare earth modified tungsten Wimet is characterized in that, its key step comprises:

(1) cupric nitrate is configured to 10 ~ 25% the aqueous solution, add tungsten carbide powder and yttrium oxide powder, being transported to atomizing nozzle atomizes, fine droplet after the atomizing sprays in the airtight high temperature reaction stove and reacts, provide the reduction atmosphere by excessive carbon in the Reaktionsofen, in Reaktionsofen temperature of reaction 800-1000 ℃;

(2) collect reacted material from the smoke outlet of Reaktionsofen, by after drip washing and the oven dry, collect powder material respectively, this moment, the material powder was the WC/Cu powdered alloy of rare earth element yttrium modification;

(3) will go up the powdered alloy that step obtains and mix with cobalt powder, vanadium carbide, chromium carbide, tantalum carbide, titanium carbide, rhenium powder, nickel powder, add the alcohol of capacity, and make to mix;

(4) mixture was carried out in ball mill wet ball-milling 4-24 hour, rotating speed is controlled at 50-150r/min, after the ball milling, the wet mixing material is changed in the double cone mixer mixed 1-2 hour, carries out alcohol and reclaims dry 1-2 hour then;

(5) powder material that last step is obtained carries out the normal temperature static pressure, static pressure 20-30min, pressure 100-300MPa;

(6) add paraffin setting agent and constantly stirring in material, adding the paraffin amount is the 4-10% of material, churning time 2-3h;

(7) material to the paraffin typing carries out sintering, the paraffin removal 3-5h when 250-500 ℃ of temperature of elder generation in sintering process, in 2-3h, be warming up to 1350 ℃ then, in 60-80min, be warming up to 1400 ℃, then at 1400 ℃ of first sintered heat insulating 60-80min, keep 30-80min during at 10MPa at pressure again, namely obtain product after the cooling.