CN103205619A

CN103205619A - Titanium carbide-tungsten carbide composite hard alloy

Info

Publication number: CN103205619A
Application number: CN2013101745765A
Authority: CN
Inventors: 薛烽; 周健; 巨佳; 白晶; 孙扬善
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2013-05-10
Filing date: 2013-05-10
Publication date: 2013-07-17
Anticipated expiration: 2033-05-10
Also published as: CN103205619B

Abstract

The invention discloses a titanium carbide-tungsten carbide composite hard-phase hard alloy. The hard alloy contains a hard-phase titanium carbide-tungsten carbide alloy mixture, an Fe3Al alloy used as a binding phase and Mo, wherein the tungsten carbide alloy accounts for 50-90% by mass percentage of the hard alloy, and is 5-8 microns in granularity; the titanium carbide accounts for 10-50% by mass percentage of the hard alloy, and is 1-3 microns in granularity; the Fe3Al accounts for 5.5-15% by mass percentage of the hard alloy; and the metal Mo accounts for 0.5-1% by mass percentage of the hard alloy. According to the titanium carbide-tungsten carbide composite hard-phase hard alloy disclosed by the invention, the binding phase and the hard phase have an excellent wetting performance, and the prepared hard alloy can provide a structural part which is high in strength, high in density, excellent in corrosion resistance, wearing resistance and other comprehensive performances, and can be mechanically processed, heat-treated and welded; and furthermore, the hard alloy can reduce the preparation cost of like hard alloys.

Description

A kind of titanium carbide-titanium carbide tungsten composite hard alloy

Technical field

The invention belongs to the Wimet field, relate to a kind of composite ganoine phase cemented carbide.

Background technology

Wearing and tearing are one of reasons of material failure.According to the related data statistics, there is 70% part of surpassing to be in structure deteriorate and the material failure because due to the wearing and tearing, the annual whole world is because the direct and consequential damage that wearing and tearing cause has reached hundreds billion of units.Therefore high strength, high-compactness, the good structure unit of over-all properties such as corrosion-resistant, wear-resistant become and press for.

In existing heat-treated steel, austenitic steel, high ferrochrome steel and Wimet four class high-abrasive materials, Wimet has best wear resistance, and particularly the WC-Co Wimet has high-wearing feature concurrently and good toughness is used widely in fields such as cutting tool, wear part, mining and road construction work machineries.But because the bonding phase Co of WC-Co Wimet belongs to strategic resource, price rises steadily, and the exploitation of therefore seeking the substitute material of Co and novel hard alloy becomes the task of the task of top priority.

TiC is a kind of gap phase with face-centred cubic structure in the transition metal carbide, has that crystal grain reaches characteristics such as trend is little in high rigidity, high-melting-point, low density, thermostability and the sintering process, is one of the material of the exploitation of novel hard alloy.Compare with steel as the alloy of hard phase with TiC and to have the incomparable high rigidity of steel, high-wearing feature and hardening capacity, but but compare with general Wimet and to have mechanical workout thermal treatment and advantage such as can weld.

Depend on largely that as the quality on the alloy property of hard phase bonding dissolves the back mutually to the wettability of hard phase with TiC but then.In actual applications, crystal grain reaches advantages such as trend is little in high rigidity, high-melting-point, low density, thermostability and the sintering process although the TiC Wimet has, owing to the bonding phase its wettability difference has been limited its development.In contrast, WC then has good wettability mutually with bonding, so range of application is wide all the better.At this situation, a kind of new Ti C-WC composite ganoine phase cemented carbide of expectation exploitation, the bonding that searching can all have a good wettability to TiC and WC makes it have characteristics and the strong point of steel and two kinds of materials of Wimet concurrently mutually.

Summary of the invention

Technical problem: the invention provides a kind of with Fe ₃Al+Mo is the bonding phase, can improves the titanium carbide-titanium carbide tungsten composite hard alloy of the strength of materials, density, erosion resistance, wearability.

Technical scheme: titanium carbide-titanium carbide tungsten composite hard alloy of the present invention comprises the titanium carbide alloy-carbon tungsten alloy mixture as the hard phase, the Fe of conduct bonding phase ₃Al alloy and metal M o in the titanium carbide-titanium carbide tungstenalloy mixture, comprise the carbon tungsten alloy that accounts for hard phase mass percent 50%～90%, particle diameter 5～8 μ m and account for the hard titanium carbide alloy of mass percent 10%～50%, particle diameter 1～3 μ m mutually; Fe ₃The mass percent that the Al alloy accounts for Wimet is that the mass percent that 5.5%～15%, Mo accounts for Wimet is 0.5%～1%, Fe ₃The composition of Al alloy is:

Al 17%～20%；

Cr 1.3%～1.9%；

Nb 2.0%～2.4%；

Zr 0.3%～0.5%；

B 0.1%～0.3%；

Ce 0.2%～0.5%；

Fe 75%～79%。

Wimet of the present invention has can make high strength, high-compactness, corrosion-resistant, anti abrasive structure unit, can adopt the processing means of mechanical workout, thermal treatment and welding.

Beneficial effect: the present invention compared with prior art has the following advantages:

The present invention proposes a kind of with Fe ₃Al+Mo is the TiC-WC composite ganoine phase novel hard alloy of bonding phase.By using Fe ₃Al+Mo substitutes tradition bonding phase Co mutually as new bonding, has solved the problem of liquid bonding and hard phase wettability difference, improves hardness and the wear resisting property of Wimet simultaneously, and it is poor with the linear expansivity that bonds between the phase to have reduced hard.

But but the TiC-WC composite ganoine mutually also makes alloy have the mechanical workout thermal treatment of steel concurrently and characteristics such as can weld and the high strength of Wimet, high-compactness, characteristics such as corrosion-resistant and wear-resistant.

The Wimet for preparing after the vacuum sintering of new bonding phase obtains the excellent bonds of hard and bonding phase, and its SEM observes as shown in Figure 1, as can be seen from the figure, and hard phase TiC-WC and the phase Fe that bonds ₃Al+Mo energy excellent bonds, the WC particle of macrobead (granular size is at 5～8 μ m) is distributed in TiC particle (granular size is at 1～3 μ m) on every side well.The Wimet of Huo Deing by this method, improvement in performance is as follows:

1) improved the problem of bonding with the wettability difference of hard phase.New bonding phase Fe ₃Add among the Al behind 1% the Mo that the wetting angle to TiC is＜15 ° under 1500 ℃ of vacuum, to wetting angle＜1 of WC °.

2) improve hardness and wear resistance.The hardness of bonding phase Co is HB=125; Bonding phase Fe ₃The hardness of Al is HRC 〉=29.

3) dwindle bonding and hard mutually between coefficient of thermal expansion differences, the minimizing internal stress.

Hard phase WC thermal expansivity is: 4.50 * 10 ^-6/ K;

Bonding phase Co thermal expansivity is: 12.5 * 10 ^-6/ K, the difference of thermal expansivity is: 8 * 10 ^-6/ K;

Bonding phase Fe ₃The Al thermal expansivity is: 11.5 * 10 ^-6/ K, the difference of thermal expansivity is: 7 * 10 ^-6/ K.

4) new binding agent all reduces cost of alloy mutually with the TiC-WC composite ganoine.

Because the density of bonding phase Co is: 8.9g/cm ³, and bonding phase Fe ₃The density of Al is: 6.7g/cm ³With Fe ₃Al can reduce the alloy dead weight for the Wimet of bonding phase, and metalwork compound F 17-hydroxy-corticosterone e3Al price is lower than the price of metal Co especially, so Fe ₃Al can reduce production cost mutually as bonding.

The density of hard phase TiC is 4.99g/cm ³, WC density is 15.6g/cm ³The deadweight that adds affiliation reduction alloy of TiC reduces production cost in the Wimet.

5) but but the TiC-WC composite ganoine mutually also make alloy have the mechanical workout thermal treatment of steel concurrently and characteristics such as can weld and the high strength of Wimet, high-compactness, characteristics such as corrosion-resistant and wear-resistant.

In sum, the present invention adopts with Fe ₃Al+Mo has solved the wetting problem of hard phase and has improved hardness of alloy and wear resisting property for the TiC-WC composite hard alloy of bonding phase, it is poor with the linear expansivity between the bonding phase to have reduced hard, the internal stress that produces when reducing alloy sintering, reduce preparation cost, make it have characteristics and the strong point of steel and two kinds of materials of Wimet concurrently, and preparation method's technology is simple, and cost is relatively low, can scale operation.

Description of drawings

Fig. 1 prepares with Fe for vacuum sintering ₃Al+Mo is the TiC-WC novel hard alloy SEM photo of bonding phase.

Embodiment

Do further below by the present invention of embodiment and to specify.

Embodiment 1:

At first will sieve in advance and choose uniform particle size is that TiC powder about 1～3 μ m and granularity are that WC powder about 5～8 μ m prepares binding agent Fe by massfraction 1:9 ₃Al and Mo prepare by 5.5% and 1% of Wimet massfraction, wherein Fe ₃The composition of Al alloy is for (to account for Fe ₃The Al alloy gets mass percent): Al17%; Cr1.3%; Nb2.0%; Zr0.3%; B0.2%; Ce0.2%; Fe79%.And the additive stearic acid batching of adding total mass mark 1%, in ball mill, mix and ground 48 hours; Ground raw material sieves the removal coacervate after vacuum-drying with mixing also, granulates then, waits to make compound behind accreditation, again at 1000kg/cm ²Pressure under carry out precision compacting, make the high precision pressed compact; The high precision pressed compact that makes is placed vacuum sintering furnace, and pressed compact is 5 * 10 in vacuum tightness ^-4Be heated to 1400 ℃ of following sintering in the atmosphere of MPa 1 hour, then the hot isostatic pressing (HIP) that carried out 1 hour under 1400 ℃ and 100MPa is handled, and makes Wimet.Take out after cooling and namely obtain finished product.

Embodiment 2:

At first will sieve in advance and choose uniform particle size is that TiC powder about 1～3 μ m and granularity are that WC powder about 5～8 μ m prepares binding agent Fe by massfraction 3:7 ₃Al and Mo prepare by 9.3% and 0.7% of Wimet massfraction, wherein Fe ₃The composition of Al alloy is for (to account for Fe ₃The Al alloy gets mass percent): Al19.2%; Cr1.6%; Nb2.4%; Zr0.5%; B0.1%; Ce0.5%; Fe75.7%.And the additive stearic acid batching of adding total mass mark 0.5%, in ball mill, mix and ground 48 hours; Ground raw material sieves the removal coacervate after vacuum-drying with mixing also, granulates then, waits to make compound behind accreditation, again at 1000kg/cm ²Pressure under carry out precision compacting, make the high precision pressed compact; The high precision pressed compact that makes is placed vacuum sintering furnace, and pressed compact is 5 * 10 in vacuum tightness ^-4Be heated to 1400 ℃ of following sintering in the atmosphere of MPa 1 hour, then the hot isostatic pressing (HIP) that carried out 1 hour under 1400 ℃ and 100MPa is handled, and makes Wimet.Take out after cooling and namely obtain finished product.

Embodiment 3:

At first will sieve in advance and choose uniform particle size is that TiC powder about 1～3 μ m and granularity are that WC powder about 5～8 μ m prepares binding agent Fe by massfraction 1:1 ₃Al and Mo prepare by Wimet massfraction 15% and 0.5%, wherein Fe ₃The composition of Al alloy is for (to account for Fe ₃The Al alloy gets mass percent): Al20%; Cr1.9%; Nb2.1%; Zr0.4%; B0.3%; Ce0.3%; Fe75%.And the additive stearic acid batching of adding total mass mark 0.8%, in ball mill, mix and ground 48 hours; Ground raw material sieves the removal coacervate after vacuum-drying with mixing also, granulates then, waits to make compound behind accreditation, again at 1000kg/cm ²Pressure under carry out precision compacting, make the high precision pressed compact; The high precision pressed compact that makes is placed vacuum sintering furnace, and pressed compact is 5 * 10 in vacuum tightness ^-4Be heated to 1400 ℃ of following sintering in the atmosphere of MPa 1 hour, then the hot isostatic pressing (HIP) that carried out 1 hour under 1400 ℃ and 100MPa is handled, and makes Wimet.Take out after cooling and namely obtain finished product.

Made Wimet performance

Claims

1. a titanium carbide-titanium carbide tungsten composite hard alloy is characterized in that, this Wimet comprises the titanium carbide alloy-carbon tungsten alloy mixture as the hard phase, the Fe of conduct bonding phase ₃Al alloy and metal M o in described titanium carbide alloy-carbon tungsten alloy mixture, comprise the carbon tungsten alloy that accounts for hard phase mass percent 50% ~ 90%, particle diameter 5 ~ 8 μ m and account for the hard titanium carbide alloy of mass percent 10% ~ 50%, particle diameter 1 ~ 3 μ m mutually;

Described Fe ₃The mass percent that the Al alloy accounts for Wimet is 5.5% ~ 15%, and the mass percent that described Mo accounts for Wimet is 0.5% ~ 1%, described Fe ₃The composition of Al alloy is:

Al 17%~20%；

Cr 1.3%~1.9%；

Nb 2.0%~2.4%；

Zr 0.3%~0.5%；

B 0.1%~0.3%；

Ce 0.2%~0.5%；

Fe 75%~79%。