CN1125776A

CN1125776A - Tungsten-copper-nickel-carbon high-temp. wear-resistant alloy

Info

Publication number: CN1125776A
Application number: CN 94113306
Authority: CN
Inventors: 周洛三
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-29
Filing date: 1994-12-29
Publication date: 1996-07-03
Anticipated expiration: 2014-12-29
Also published as: CN1054402C

Abstract

The high-temp antiwear W-Cu-Ni-C alloy is made of WC (15-60 Wt.%), Cu (15-30), Ni(1-5) and W (rest), as well as optional MoC (0.2-0.5) and Cr3C2 (0.2-0.5) for increasing hardness and antiwear nature. The part made of such alloy has long service life elongated by 4-8 times compared with YG15 hard alloy.

Description

Tungsten-copper-nickel-carbon high-temp wear resistant alloy

The present invention relates to a kind of high temperature wear resistant alloy that is used for hot rolling guide plate and thermal stretch (or hot extrusion).

The component that require at high temperature still to have wear resistance are of wide application.For example during the rolling stock goods, require the not only wear-resisting but also anti-rapid heat cycle of nose, the working conditions harshness that is.The nose material was done repeatedly to change for these years, adopted grey cast iron the earliest, used rich chromium cast iron thereafter instead, and was all poor because of high temperature abrasion resistance, and lack and be eliminated work-ing life.Generally adopt YG at present ₁₅(be that weight percentage is 85%WC, 15%Co) Wimet nose, though this material hardness height, but heat impact strength is poor, high temperature very easily produces the embrittlement phenomenon when working down, work-ing life is also short, and the secondary guide plate general work time is 22～29 hours, and the rolling stock ultimate production is about 142～188 tons; Because this alloy is short work-ing life, it is frequent that the nose number of times is changed in shutdown midway, both influenced production, increases working strength of workers again, suddenly waits to study and produce the alternate high temperature wear resistant alloy.

At the problem that above-mentioned alloy exists, to be that research and design is a kind of both had higher hardness to task of the present invention, has the alloy material of wear resistance at elevated temperature again, and make multiple component with it, in order to using in the various high-temperature services of rapid heat cycle.

For achieving the above object, the present invention prepares with the component that includes WC, W, Cu, Ni and C, employing powder metallurgy process is made W-Cu-Ni-C high temperature wear resistant alloy material, or is adopted powder metallurgy process directly to make high temperature high abrasion goodss such as hot rolling nose, thermal stretch mould and hot extruding die.

The composition of alloy of the present invention and goods (weight percentage) is respectively:

1. 15～60%WC, 15～30%Cu, 1～5%Ni, 1～6%C, surplus is W;

2. 15～60%WC, 15～30%Cu, 1～5%Ni, 1～6%C, 0.2～0.5%M ₀C, surplus is W;

3. 15%～60%WC, 15～30Cu, 1～5%Ni, 1～6%C, 0.2～0.5Cr ₃C ₂, surplus is W.

Produce W-Cu-Ni-C high temperature wear resistant alloy, the present invention at first adopts powder metallurgy process to prepare the alloy compound.Compound adopts the method preparation of dry bulb mill, allocates a spot of copper powder into by the alloying constituent requirement and induces metal, and carbon mainly adds with the form of combined carbon or element carbon dust, formulation is put into ball grinding cylinder together grind, and prepares compound with this.Prepared compound compression molding, acquisition has the skeleton blank of certain porosity, the copper powder that to use as infiltrated metal or it is pressed into copper sheet again, stack together with the skeleton blank, then vacuum oven or in the reducing atmosphere stove sintering, promptly make W-Cu-Ni-C alloy with wear resistance at elevated temperature.

Fig. 1 is technological process of production figure of the present invention.

In conjunction with the accompanying drawings embodiment of the present invention are further described.The main production process of alloy of the present invention is as follows:

(1) compound preparation:

It is 6～8 μ m that raw material adopts tungsten carbide powder and tungsten powder mean particle size, and it is raw material that copper powder, nickel powder and carbon dust all require the powder less than 75 μ m, and compound composition proportion (weight percentage) is 15～60%WC, 2.5～5%Cu, 1～5%Ni, 1～6%C, surplus is W; Or add 0.2～0.5%M ₀C, or add 0.2～0.5%Cr ₃C ₂, surplus is W.Be placed in the ball grinding cylinder after the compound configuration, adopt the method for dry bulb mill, ball milling 6～20 hours is made lubricant at the oleic acid of abrasive material adding 0.3～0.5%, makes the compound of described alloy like this.

(2) the skeleton blank is made in mold pressing:

With the dress mould of weighing of the compound behind the ball milling, by hydropress with the compound compression molding, the size and the substance of control briquetting in the pressing process, guarantee that skeleton blank porosity (volume ratio) is 15～35%, make alloy skeleton blank thus, or be made into the hot rolling nose, thermal potential is stretched mould and hot extruding die blank.

(3) melting infiltration sintering:

In compound, induce the copper powder that metal uses by proportioning; the powder of 12.5 remaining～25%Cu is put with the skeleton blank and is burnt in the boat; or the copper powder of remainder is pressed into copper sheet; copper sheet and skeleton blank are stacked in one; copper sheet place above or below the skeleton blank all can, it is sent in the molybdenum wire furnace of vacuum oven or hydrogen shield carries out melting infiltration sintering, the melting infiltration sintering temperature is 1150～1440 ℃; be incubated 0.5～2 hour, promptly make high temperature wear resistant alloy.Adopt aforesaid method can make high temperature high abrasion goodss such as hot rolling nose, thermal stretch mould and hot extruding die equally.

Above-mentioned alloy or goods are heated to 1000 ± 20 ℃ temperature and continue 10 minutes in air, the quenching of spraying water under high-pressure water tap again 20 times so repeatedly, is not found alloy or product surface and internal fissure.Because of the solubleness height of tungsten in nickel, recrystallization speed is also high, because carbon content has certain scope, has formed the sosoloid of tungsten and carbon and nickel in W-C-Ni system, and this point is proved by practice already.Nickel and copper all have good wetting property to wolfram varbide.Adopt copper to do the infiltration agent simultaneously, not only improve the density and the compactness of alloy, also significantly improve the heat conductivility of alloy.Or add a spot of molybdenum carbide or add hot hardness and the wear resistance that a spot of chromium carbide can significantly improve alloy.Alloy of the present invention is applicable to needs attrition resistant corresponding field in high-temperature service.

Alloy of the present invention or goods and YG ₁₅Wimet is compared, and has following advantage: the hardness height of (1) alloy and goods thereof, and general (HB) is 3500～4000MPa; (2) have wear resistance in high temperature (about 1000 ℃) operation, and heat impact strength is good, alloy and goods thereof do not have cracking phenomena; (3) long service life is generally used in high-temperature service about 130～200 hours, is equivalent to 4～8 times of comparative alloy life-span; (4) improve labour productivity, reduced working strength of workers; (5) increase output, reduced production cost.

Now provide the following example, as replenishing of embodiment of the present invention.In the listed example, according to alloy or goods composition (weight percentage) proportioning, adopt above-mentioned production process, alloy of being produced or goods are through service check, the steel billet that Wuhan Iron and Steel Company, Xiangtan Iron and Steel, Changsha Steel Plant are produced carries out production test then, list the machine operation time on it respectively, rolling stock output is with the feasibility of check goods of the present invention.

Embodiment 1:34%WC, 22.5%Cu, 2.6%Ni, 2.9%C, 38%W, its density is 14.52

Gram per centimeter ³, hardness [HB] is 3851MPa, steel are produced in last machine work 136 hours

773 tons.

Embodiment 2:50%WC, 15%Cu, 2.5%Ni, 3.8%C, 28.7%W, its density is 14.50

Gram per centimeter ³, hardness [HB] is 3577MPa, last machine work 200 hours, rolling stock

More than 1000 tons.

Embodiment 3:38%WC, 18%Cu, 3%Ni, 3.2%C, 37.8%W, its density is 14.40 grams

/ centimetre ³, hardness [HB] is 3959MPa, last machine work 150 hours, rolling stock

800 tons.

Embodiment 4:55%WC, 17%Cu, 2%Ni, 4.2%C, 21.8%W, its density is 14.40 grams

/ centimetre ³, hardness [HB] is 3655MPa, last machine work 190 hours, rolling stock

900 tons.

Embodiment 5:42%WC, 20%Cu, 4%Ni, 3.4%C, 30.6%W, its density is 14.40 grams

/ centimetre ³, hardness [HB] is 3498MPa, last machine work 230 hours, rolling stock

1313 tons.

Embodiment 6:43%WC, 19%Cu, 4.1%Ni, 5%C, 28.9%W, its density is 14.55 grams

/ centimetre ³, hardness [HB] is 3570MPa, last machine work 128 hours, rolling stock

950 tons.

Embodiment 7:60%WC, 16%Cu, 5%Ni, 6%C, 13.0%W, its density be 14.6 the gram/li

Rice ³, hardness [HB] is 3580MPa, last machine work 130 hours, rolling stock 1080

Ton.

Embodiment 8:42%WC, 20%Cu, 4%Ni, 3.4%C, 30.4%W add 0.2%M ₀C, its

Density is 14.64 gram per centimeters ³, hardness [HB] is 4010MPa, last machine work 214

Hour, 1113.8 tons of rolling stocks.

Embodiment 9:42%WC, 20%Cu, 4%Ni, 3.4%C, 30.4%W add 0.2%Cr ₃C ₂,

Its density is 14.56 gram per centimeters ³, hardness [HB] is 4008MPa, last machine work 208

Hour, 1200 tons of rolling stocks.

In contrast YG when rolling ₁₅The alloy guide plate, its working hour is 22～29 hours, the rolling stock ultimate production is 142～188 tons.

Claims

1, a kind of tungsten-copper-nickel-carbon high-temp wear resistant alloy is to be the sintered metal product of base with tungsten and wolfram varbide, it is characterized in that the composition (weight percentage) of alloy and goods thereof is respectively:

(1) 15～60%WC, 15～30%Cu, 1～5%Ni, 1～6%C, surplus is W;

(2) 15～60%WC, 15～30%Cu, 1～5%Ni, 1～6%C, 0.2～0.5%MoC, surplus is W;

(3) 15～60%WC, 15～30%Cu, 1～5%Ni, 1～6%C, 0.2～0.5%Cr ₃C ₂, surplus is W;

Above-mentioned alloy and goods thereof; be to be tungsten carbide powder and the tungsten powder of 6～8 μ m with mean particle size; and be raw material less than copper powder, nickel powder and the carbon dust of 75 μ m; by the composition of alloy respectively through ground and mixed, to be molded into porosity (volume ratio) be 15～35% skeleton blank, and the copper powder that adds or copper sheet placed the molybdenum wire furnace melting infiltration sintering 0.5～2 hour of 1150～1440 ℃ vacuum oven or hydrogen shield with the skeleton blank.

2, according to the preparation method of described alloy of claim 1 and goods thereof, it is characterized in that the adding of copper powder, be to add (weight percentage) 2.5～5%Cu in ground and mixed, add 12.5～25%Cu in the melting infiltration sintering operation, carbon is the form adding with combined carbon or element carbon dust.

3, according to the preparation method of described alloy of claim 1 and goods thereof, it is characterized in that ground and mixed, is that compound is placed ball grinding cylinder, grinds 6～20 hours.

4,, it is characterized in that adding in the material of ground and mixed the oleic acid of (weight percentage) 0.3～0.5% according to the manufacture method of described alloy of claim 1 and goods thereof.

5, according to the manufacture method of described alloy of claim 1 and goods thereof, it is characterized in that stacking together by still surplus (weight percentage) 12.5～25%Cu powder of proportioning or with its skeleton blank that is pressed into copper sheet and compression molding (above or below the skeleton blank all can) carries out melting infiltration sintering.