CN103898387A - Binding-phase TiC/WC composite hard alloy and preparation method thereof - Google Patents
Binding-phase TiC/WC composite hard alloy and preparation method thereof Download PDFInfo
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- CN103898387A CN103898387A CN201410178527.3A CN201410178527A CN103898387A CN 103898387 A CN103898387 A CN 103898387A CN 201410178527 A CN201410178527 A CN 201410178527A CN 103898387 A CN103898387 A CN 103898387A
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Abstract
The invention discloses a binding-phase TiC/WC composite hard alloy and a preparation method thereof. The binding-phase TiC/WC composite hard alloy is prepared from the following raw materials in percentage by mass: 84-94% of hard-phase TiC and WC mixed powder, 5-15% of ternary intermetallic compound Co2AlTi powder and 0.5-1% of stearic acid additive, wherein the hard-phase TiC and WC mixed powder serves as a hard phase and has uniform granularity, and the ternary intermetallic compound Co2AlTi powder serves as a binding phase. The method comprises the steps of firstly, mixing and grinding the raw materials in a ball mill; carrying out vacuum drying, then, screening to remove aggregates, then, granulating, and then, pressing at the pressure of 800-1,200kg/cm<2>; putting a prepared pressed shape in a vacuum sintering furnace with the degree of vacuum of 3*10<-4> to 5*10<-4>MPa, heating to the temperature of 1,200-1,350 DEG C, carrying out vacuum sintering for 1-2 hours, then, carrying out hot isostatic pressing treatment for 1-5 hours at the temperature of 1,200-1,350 DEG C and the pressure of 80-100MPa, cooling, and then, taking out, thereby obtaining the hard alloy.
Description
Technical field
The Wimet field that the invention belongs to wear resistant corrosion resistant parts, relates to a kind of TiC/WC composite hard alloy and preparation method thereof.
Background technology
Wimet be a kind of utilize powder metallurgy technology prepare, taking the carbide (TiC, WC etc.) of high rigidity refractory metal as main component, and add Binder Phase (Co, Ti, Ni etc.), the material that sintering forms in vacuum oven.The hard mutual-assistance material of Wimet has high rigidity, high strength, good wear resistance, thermotolerance.The Binder Phase of Wimet is given the certain toughness of Wimet, deformability, and Wimet can be heat-treated.Wimet also has good high-temperature behavior, is widely used in cutter material, moulding stock, drill for oil well, the fields such as excavated material.Along with more Wimet be developed with and the environmental protection more economically of process for processing mode, Wimet will have more wide application space.
Wimet can be divided into YG series, YT series etc., and present stage, common Wimet was mainly taking WC as hard phase, the YG serial carbide alloy taking Co as binding agent.Co and WC have good wettability and WC in Co, to have certain solubleness, and sintering cemented carbide performance taking Co as binding agent is good, intensity is high, has been widely used in all kinds of cutters, wear-resisting machining tool.In Wimet, the hard phases such as WC have very high hardness and heat-resistant antifriction, but simultaneously also very crisp.Due to the existence of the Binder Phase of the metal such as Co composition, Wimet can bear larger distortion, thereby can carry out all kinds of processing and thermal treatment.Not only Binder Phase itself can determine intensity and the toughness of alloy, and the combination degree of Binder Phase and hard phase also can determine intensity and the toughness of Wimet.
Although Co has its advantage as Binder Phase, but the Wimet antioxidant property of being made up of it and corrosion resistance nature are not outstanding, in the time using in sour environment, can peel off because Binder Phase inefficacy causes hard phase, make the applied environment of Wimet be subject to limitation.Co is also a kind of relatively expensive and rare metal simultaneously, and its reserves are very limited, and price is also rising steadily.Though Wimet is applied to lathe tool in present stage more, milling cutter, digging tool, wear parts etc. are located, and it will have application widely in the future.Therefore economical Wimet is the inexorable trend of development cheaply.Meanwhile, the Binder Phase taking Co metal as main component also should improve its antioxidant property and corrosion resistance nature, to adapt to Wimet market widely.
Co-Al-Ti three component system can form Co in rich CoTi district
2alTi, CoTi, the chemofacies of the better performances such as CoAl.These intermetallic compounds not only have high strength, high rigidity, low-density feature at normal temperatures, also show outstanding anti-oxidant, corrosion resistance in the time of high temperature.The performances such as interpolation Al can also optimize CoTi structure in rich CoTi district, thereby improves its antifatigue, anticorrosive.
Summary of the invention
Technical problem: the invention provides a kind of have good wear-resistant, anti-oxidant, corrosion resistance in harsh and unforgiving environments, extend it at sour oil gas field environment, flowing water washes away the work-ing life in environment, in possessing excellent hardness and wear resisting property, strengthen its anti-oxidant, corrosion resistance, reduce the TiC/WC composite hard alloy of the density of Wimet and the Binder Phase of production cost, a kind of preparation method of this composite hard alloy is provided simultaneously.
Technical scheme: the method for the TiC/WC composite hard alloy of preparing Binder Phase of the present invention, comprises following steps:
(a) be first respectively 84%～94% the even-grained TiC as hard phase and WC mixed powder, 5%～15% the Ternary intermetallic compounds Co as Binder Phase using accounting for raw materials quality degree
2alTi powder, and 0.5%～1% stearic acid additive, one coexists in ball mill mixes and grinds 12～48 hours;
(b) by mix and grind after raw material after vacuum-drying, sieve and remove coacervate, then granulate, then at 800～1000kg/cm
2pressure under be pressed into pressed compact;
(c) pressed compact making being placed in to vacuum tightness is 3 × 10
-4～5 × 10
-4in the vacuum sintering furnace of MPa, be heated to 1200～1350 DEG C of vacuum sintering 1-2 hour, then under 1200～1350 DEG C and 80～100MPa, carry out the hip treatment of 1～5 hour, make the TiC/WC composite hard alloy of Binder Phase.
In the preferred version of the inventive method, the particle size range of TiC and WC mixed powder is 3～5 μ m, Ternary intermetallic compounds Co
2the particle size range of AlTi powder is 1～3 μ m, Ternary intermetallic compounds Co
2the molar percentage that composition in AlTi powder and each component account for Binder Phase than scope is:
The TiC/WC composite hard alloy of Binder Phase of the present invention, prepares according to the method described above.
The TiC/WC Wimet that the present invention is Binder Phase with Co-Al-Ti ternary can show superior wear resistant corrosion resistant in severe environment.Its range of application is: the industries such as oil, chemical industry, mine, metallurgy, water conservancy, electric power, food, medical treatment, metal cutting.Utilize the component of machine of this Wimet making except general environment for use, also can contact as acid, alkali, salt, seawater etc. with corrosive medium, even sometimes, in High Temperature High Pressure and wash away etc. under severe condition and work, as: drill bit, all kinds of cutter (lathe tools, milling cutter etc.), the wear parts such as cutting, excavation, oil gas storage etc.
Beneficial effect: the present invention compared with prior art, has the following advantages:
Of the present invention with Co
2alTi Ternary intermetallic compounds is that the TiC/WC composite hard alloy of Binder Phase represents good wear-resistant, anti-oxidant, corrosion resistance in harsh and unforgiving environments, and as it is at sour oil gas field environment, flowing water washes away the application in environment.The TiC/WC composite hard alloy being obtained by the present invention has strengthened its anti-oxidant, corrosion resistance in possessing excellent hardness and wear resisting property, to increase the work-ing life of Wimet and to expand its Application Areas, can also reduce density and the production cost of Wimet simultaneously.The Wimet obtaining by the present invention, improvement in performance is as follows:
Improve hardness, the performances such as wear resistance: the hardness of Binder Phase Co is HB=125; Binder Phase Co
2the hardness of AlTi is HRC>=34.Wimet with respect to tradition using Co as Binder Phase, with Co
2alTi is that the Wimet of Binder Phase has higher hardness and wear resisting property.
Refinement Binder Phase crystal grain: with Co
2alTi is in the Wimet of Binder Phase, can the fine setting in composition range make Co by Al content
2alTi crystal grain trend of grain growth in sintering process is inhibited, refinement the crystal grain of Binder Phase, strengthened the mechanical property of Binder Phase.
Density: the density of Binder Phase Co is: 8.9g/cm
3, and Binder Phase Co
2the density of AlTi is: 6.25g/cm
3.Therefore, with Co
2alTi is that the Wimet global density of Binder Phase reduces, and the Wimet of same volume can reduce itself deadweight.
Erosion resistance: the Wimet of tradition using Co as Binder Phase is one of mode of its inefficacy because the corrosion of Co causes hard phase to come off.And Binder Phase Co
2alTi intermetallic compound, has very strong corrosion resistance nature, with Co
2thereby the Wimet that AlTi is Binder Phase can be put forward heavy alloyed overall corrosion resistance and extend its work-ing life under exceedingly odious condition.
Dwindle coefficient of thermal expansion differences between Binder Phase and hard phase: hard phase WC thermal expansivity is: 4.50 × 10
-6/ K; TiC thermal expansivity is: 7.40 × 10
-6/ K; Binder Phase Co thermal expansivity is: 12.5 × 10
-6/ K, the difference of thermal expansivity is: 8 × 10
-6/ K and 5.1 × 10
-6/ K; Binder Phase Co
2alTi thermal expansivity is: 10.4 × 10
-6/ K, the difference of thermal expansivity is: 5.9 × 10
-6/ K and 3 × 10
-6/ K.
Reduce costs: Binder Phase Co
2the density of AlTi is lower than the density of Binder Phase Co,, reduce the weight of Wimet.And Al, the price of Ti is well below the price of Co, and therefore Binder Phase of the present invention can alleviate the density of Wimet, reduces the cost of Wimet.
In sum, the present invention adopts with Co
2alTi ternary is that the TiC/WC composite hard alloy of Binder Phase can be carried heavy alloyed hardness and wear resisting property.Binder Phase Co
2alTi has the identical wetting ability of traditional Binder Phase Co, and it can also reduce the density of Wimet simultaneously, makes Wimet of the same type prepare cost.Co on the other hand
2alTi intermetallic compound has outstanding anti-oxidant, and erosion resistance ability can be improved significantly Wimet and corrode situation about losing efficacy because of Binder Phase.Preparation method's technique of the present invention is simple, and cost is relatively low, can scale operation.
Brief description of the drawings
Fig. 1 is Co of the present invention
2alTi is the TiC/WC composite hard alloy microstructure of Binder Phase.
Embodiment
Below by embodiment, the present invention is further described in detail.
Embodiment 1
First choose TiC and the WC powder that uniform particle size is 3～5 μ m prepares and mixes by massfraction 100% and 0% sieving in advance, then take raw materials quality per-cent and be 94% mixing TiC/WC powder, then be the Co of 1～3 μ m by mixing TiC/WC powder and granularity
2alTi powder prepares by massfraction 94% and 5%, and adds the stearic acid of total mass 1%, then in ball mill, mixes and grinds 12 hours; After vacuum-drying, sieve removal coacervate by mixing also ground raw material, then granulate, then at 1000kg/cm
2pressure under carry out precision compacting, make pressed compact; It is 3 × 10 that the pressed compact making is placed in to vacuum tightness
-4in the vacuum sintering furnace of MPa, be heated to 1200 DEG C of vacuum sinterings 2 hours, then under 1200 DEG C and 80MPa, carry out the hip treatment of 5 hours, make Wimet.Take out and obtain finished product after cooling.
Embodiment 2
First choose TiC and the WC powder that uniform particle size is 3～5 μ m prepares and mixes by massfraction 90% and 10% sieving in advance, then take raw materials quality per-cent and be 91% mixing TiC/WC powder, then be the Co of 1～3 μ m by mixing TiC/WC powder and granularity
2alTi powder prepares by massfraction 91% and 8%, and adds the stearic acid of total mass 0.9%, then in ball mill, mixes and grinds 15 hours; After vacuum-drying, sieve removal coacervate by mixing also ground raw material, then granulate, then at 900kg/cm
2pressure under carry out precision compacting, make pressed compact; It is 3.5 × 10 that the pressed compact making is placed in to vacuum tightness
-4in the vacuum sintering furnace of MPa, be heated to 1280 DEG C of vacuum sinterings 1.8 hours, then under 1230 DEG C and 850MPa, carry out the hip treatment of 4.5 hours, make Wimet.Take out and obtain finished product after cooling.
Embodiment 3
First choose TiC and the WC powder that uniform particle size is 3～5 μ m by sieving in advance and prepare and mix by massfraction 80% and 20%, then take the mixing TiC/WC powder of raw materials quality per-cent 89%, then will mix TiC/WC powder and granularity is 1～3 μ mCo
2alTi powder prepares by massfraction 89% and 10%, and adds the stearic acid of total mass 0.8%, then in ball mill, mixes and grinds 24 hours; After vacuum-drying, sieve removal coacervate by mixing also ground raw material, then granulate, then at 900kg/cm
2pressure under suppress, make pressed compact; It is 4 × 10 that the pressed compact making is placed in to vacuum tightness
-4in the vacuum sintering furnace of MPa, be heated to 1250 DEG C of vacuum sinterings 1.5 hours, then under 1250 DEG C and 90MPa, carry out the hip treatment of 2 hours, make Wimet.Take out and obtain finished product after cooling.
Embodiment 4
First choose TiC and the WC powder that uniform particle size is 3～5 μ m prepares and mixes by massfraction 60% and 40% sieving in advance, then take the mixing TiC/WC powder of raw materials quality per-cent 87%, then be the Co of 1～3 μ m by mixing TiC/WC powder and granularity
2alTi powder prepares by massfraction 87% and 12%, and adds the stearic acid of total mass 0.6%, then in ball mill, mixes and grinds 36 hours; After vacuum-drying, sieve removal coacervate by mixing also ground raw material, then granulate, then at 850kg/cm
2pressure under carry out precision compacting, make pressed compact; It is 4.5 × 10 that the pressed compact making is placed in to vacuum tightness
-4in the vacuum sintering furnace of MPa, be heated to 1230 DEG C of vacuum sinterings 1.9 hours, then under 1300 DEG C and 95MPa, carry out the hip treatment of 1.5 hours, make Wimet.Take out and obtain finished product after cooling.
Embodiment 5
First choose TiC and the WC powder that uniform particle size is 3～5 μ m by sieving in advance and prepare and mix by massfraction 50% and 50%, then take the mixing TiC/WC powder of raw materials quality per-cent 84%, then will mix TiC/WC powder and granularity is 1～3 μ mCo
2alTi prepares by massfraction 84% and 15%, and adds total mass 0.5% stearic acid, then in ball mill, mixes and grinds 48 hours; After vacuum-drying, sieve removal coacervate by mixing also ground raw material, then granulate, then at 800kg/cm
2pressure under suppress, make pressed compact; It is 5 × 10 that the pressed compact making is placed in to vacuum tightness
-4in the vacuum sintering furnace of MPa, be heated to 1350 DEG C of vacuum sinterings 1 hour, then under 1350 DEG C and 100MPa, carry out the hip treatment of 1 hour, make Wimet.Take out and obtain finished product after cooling.
Made Cemented Carbide Properties
Should understand above-described embodiment only for the embodiment of technical solution of the present invention is described, limit the scope of the invention and be not used in.After having read the present invention, amendment and the replacement of those skilled in the art to various equivalents of the present invention all falls within the protection domain that the application's claim limits.
Claims (3)
1. a method of preparing the TiC/WC composite hard alloy of Binder Phase, is characterized in that, the method comprises the following steps:
(a) be first respectively 84%～94% the even-grained TiC as hard phase and WC mixed powder, 5%～15% the Ternary intermetallic compounds Co as Binder Phase using accounting for raw materials quality degree
2alTi powder, and 0.5%～1% stearic acid additive, one coexists in ball mill mixes and grinds 12～48 hours;
(b) by mix and grind after raw material after vacuum-drying, sieve and remove coacervate, then granulate, then at 800～1000kg/cm
2pressure under be pressed into pressed compact;
(c) pressed compact making being placed in to vacuum tightness is 3 × 10
-4～5 × 10
-4in the vacuum sintering furnace of MPa, be heated to 1200～1350 DEG C of vacuum sintering 1-2 hour, then under 1200～1350 DEG C and 80～100MPa, carry out the hip treatment of 1～5 hour, make the TiC/WC composite hard alloy of Binder Phase.
2. the method for the TiC/WC composite hard alloy of preparing Binder Phase according to claim 1, is characterized in that, the particle size range of described TiC and WC mixed powder is 3～5 μ m, described Ternary intermetallic compounds Co
2the particle size range of AlTi powder is 1～3 μ m, described Ternary intermetallic compounds Co
2the molar percentage that composition in AlTi powder and each component account for Binder Phase than scope is:
3. a TiC/WC composite hard alloy for Binder Phase, is characterized in that, this Wimet prepares according to method described in claim 1 or 2.
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Cited By (2)
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| CN107779717A (en) * | 2017-09-20 | 2018-03-09 | 苏州瑞森硬质合金有限公司 | Light-high-strength titanium-based fine grain hard alloy bar material and its preparation technology |
| CN115138849A (en) * | 2022-06-02 | 2022-10-04 | 湖南科技大学 | Preparation method of binderless hard alloy cutter material |
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| CN115138849B (en) * | 2022-06-02 | 2024-01-12 | 湖南科技大学 | Preparation method of binding phase-free hard alloy cutter material |
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Application publication date: 20140702 Assignee: JIANGSU POMLEAD CO.,LTD. Assignor: SOUTHEAST University Contract record no.: X2023320010015 Denomination of invention: TiC/WC composite cemented carbide with bonding phase and its preparation method Granted publication date: 20150916 License type: Common License Record date: 20230128 |
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