CN100526490C - Hard alloy sintered by high-entropy alloy binder and compound carbide and preparation method thereof - Google Patents
Hard alloy sintered by high-entropy alloy binder and compound carbide and preparation method thereof Download PDFInfo
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- CN100526490C CN100526490C CN 200610034982 CN200610034982A CN100526490C CN 100526490 C CN100526490 C CN 100526490C CN 200610034982 CN200610034982 CN 200610034982 CN 200610034982 A CN200610034982 A CN 200610034982A CN 100526490 C CN100526490 C CN 100526490C
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Abstract
The invention relates the high entropy alloy binding agent and hard alloy sintered by multicarbide and preparing method, comprising the following steps: clinkering polyhydric high entropy alloy powder binding phase and multicarbide, the binding phase comprising 5-10 kinds metallic elements, every kind of whose content is between 5%-30%; the multicarbide hand base comprises 2-4 super hand carbides, every kind of whose content is between 5%-90%. The invention has the advantages of high hand, high tenacity and high fire-resisting property.
Description
[technical field]
The present invention relates to a kind of Wimet and preparation method thereof, especially relate to a kind of be the hard phase with the double carbide, be the formulated high-entropy alloy binder of bonding phase and double carbide agglomerating Wimet and preparation method thereof with polynary high-entropy alloy.
[background technology]
Wimet is a kind of quite successful matrix material, it combines the high strength of stupalith and the toughness of metallic substance, become the material that has high rigidity and have proper toughness, its wear resistance temperature tolerance performance is also very excellent in addition, used widely by industry member, main range of application has cutting, casted die mould, anti-wear component, high temperature instrument etc.
Based on the superhard alloy of carbide, wherein be in the great majority with WC base and TiC base cemented carbide again at present.The wedding agent of WC Wimet is based on cobalt, and the wedding agent of TiC Wimet is based on nickel.Because the toughness of WC Wimet is better than the TiC Wimet, so its application is comparatively extensive, but W and Co price are very high and be strategic materials, demand owing to various component grows with each passing day in addition, in order to increase productivity and to reduce cost, High Speed Machining has become main development trend, and TiC porcelain gold is because of the tool temperature tolerance good than WC in precision and high speed cutting, so the TiC Wimet is in the certain status of industrial application still tool.In recent years, for the hardness that improves Wimet with intensity and to hard mutually with bonding mutually in an amount of composite parts of interpolation, as adding WC, VC, TaC, Mo in the TiC Wimet
2C etc. then add an amount of Mo, Ti, Al etc. mutually based on the bonding of cobalt and nickel.But these added ingredientss all are extremely a spot of, fail to change the limitation of single principal element.
High-entropy alloy is the alloy of no single principal element, is made up of 5 to 10 kinds of alloying elements, and the content molar percentage of every kind of element is between 5% to 35%.It is the new alloy field beyond the conventional alloys, bigger degree of freedom is arranged on alloy designs, because the high entropy effect of many principal elements, the kind of its phase tends to simple sosoloid on the contrary, and the diffusion underdrive effect that multielement causes makes the solid phase precipitate tend to nanostructure; High-entropy alloy often has special nature and comprises high rigidity, corrosion-resistant, resistance to oxidation, and high temperature precipitation-hardening etc.Because the special property of high-entropy alloy, the present invention becomes Wimet to high-entropy alloy as the bonding of Wimet with the double carbide phase sintering.
Chinese patent application 03124741.5 discloses a kind of hard alloy composite material, this invention comprises hard alloy substrate, this cemented carbide substrate surfaces is compounded with the hard alloy particle layer that pellet hardness is higher and be evenly distributed, the mass percent composition of described hard alloy particle is, Co is 0-3%, and WC is 97-100%.This invents used W and the Co price is very high and be strategic materials, and the limitation of single principal element is arranged.
[summary of the invention]
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of be the hard phase with the double carbide, be the formulated high-entropy alloy binder of bonding phase and double carbide agglomerating Wimet and preparation method thereof with polynary high-entropy alloy.
The technical solution adopted for the present invention to solve the technical problems is: a kind of high-entropy alloy binder and double carbide agglomerating Wimet, comprise bonding mutually with hard mutually, described bonding adopts polynary high-entropy alloy mutually, the major metal element that this bonding phase is contained comprises iron, cobalt, nickel, chromium, aluminium, titanium, vanadium, copper, zirconium, molybdenum and manganese, described hard adopts double carbide mutually, this hard contains at least two kinds of four kinds of double carbides at the most in mutually, and the main carbide that described double carbide hard phase is contained is TiC, VC, ZrC, WC, B
4C, SiC, TaC and Mo
2C; Each carbide in each double carbide accounts for the percentage ratio of this double carbide weight between 5% to 90%, and the weight percentage sum of each carbide is 100% in each double carbide.Described hard comprises in mutually and adds less important superhard compound, and this less important superhard compound is nitride or boride, and the percentage ratio that the weight of this less important superhard compound accounts for hard phase total amount is at most 5wt%.
The making method of above-mentioned a kind of high-entropy alloy binder and double carbide agglomerating Wimet, taking by weighing double carbide mixes in ball grinding cylinder with bonding metal-powder mutually, then ball grinding cylinder is put into the high-energy ball milling that ball mill carried out 10 hours at least, the paraffin that adds 1-2wt% in ball grinding cylinder carries out at least 5 hours low energy ball milling again as wetting agent and binding agent then; Being pressed into round embryo after discharging and the drying, is to take off ester and sintering then, and taking off ester is to carry out under 400 ℃ under argon hydrogen mixed atmosphere in vacuum oven, after taking off the ester processing, promptly carries out sintering at 1350 ℃-1500 ℃ under vacuum condition, makes finished product at last.
Positively effect of the present invention is: according to different bondings mutually with different composite carbide hard mutually, its hardness is changed by 1450HV to 1950HV; Fracture toughness property K
IC8 to 15MNm
-1.5Between; Under 700 ℃ temperature, its hardness is still more than 700HV.Have hardness height, good toughness and temperature tolerance excellent characteristics.
[embodiment]
Embodiment 1:
Get six kinds of metallic elements such as aluminium, cobalt, chromium, copper, iron, nickel, its mole ratio is: 0.5:1:1:1:1:1, about 40 grams of its gross weight.Get titanium carbide 108 grams and wolfram varbide 12 grams.Elemental metalpowder is mixed in ball grinding cylinder with two kinds of carbide powders, then ball grinding cylinder is put into the high-energy ball milling that ball mill carries out 12 hours.The paraffin that adds 1.5wt% in ball grinding cylinder carries out 6 hours low energy ball milling again as wetting agent and binding agent then.Be pressed into the round embryo of Φ 12mm x 5mm after discharging and the drying.Be to take off ester and sintering at last.Taking off ester is to carry out under 400 ℃ under argon hydrogen mixed atmosphere in vacuum oven.After handling, ester can under vacuum condition, carry out sintering through taking off at 1400 ℃.And measure its performance.
Embodiment 2 to 7:
Repeat the manufacturing step of embodiment 1, but the composition of the component of the phase that will bond and double carbide changes the composition shown in Wimet numbering 2 to 7 in the table one.
Table one: Wimet is formed (the double carbide hard is 4:1 with high-entropy alloy binder element powders weight ratio)
Utilize Vickers hardness tester to measure the hardness value of Wimet sample number into spectrum 1 to 7 all test pieces.Institute's application of load is 5kgf during measurement, and duration of load application is 10 seconds.Seven different position hardness values are all measured in each test piece, with the hardness of middle five mean values as this test piece.Its result as shown in Table 2.
Fracture toughness property (K
IC) be to calculate by the slight crack length (I) that Vickers' hardness measures.Calculation formula is as follows:
The K that formula calculates in the utilization
ICAs shown in Table 2.
Table two: the hardness of Wimet and fracture toughness property measured value
| The Wimet numbering | Hardness (HV) | 700 ℃ of hot hardness (HV) | K IC(MNm -1.5) |
| 1 | 1890 | 930 | 8.9 |
| 2 | 1920 | 970 | 8.6 |
| 3 | 1870 | 880 | 9.3 |
| 4 | 1480 | 750 | 13.5 |
| 5 | 1510 | 770 | 11.5 |
| 6 | 1490 | 710 | 12.8 |
| 7 | 1570 | 790 | 10.2 |
In sum, polynary high-entropy alloy is good Wimet binding agent, and it has fabulous wettability mutually with the double carbide hard.It is good that Wimet of the present invention has higher normal temperature hardness and hot hardness and fracture toughness property than ordinary rigid alloy.
The above only is preferred embodiment of the present invention, such as according to various modifications and variation that the present invention did, is the present invention and contains.
Claims (3)
1, a kind of high-entropy alloy binder and double carbide agglomerating Wimet, comprise bonding mutually with hard mutually, it is characterized in that: described bonding adopts polynary high-entropy alloy mutually, the major metal element that this bonding phase is contained comprises iron, cobalt, nickel, chromium, aluminium, titanium, vanadium, copper, zirconium, molybdenum and manganese, described hard adopts double carbide mutually, this hard contains at least two kinds of four kinds of double carbides at the most in mutually, and the main carbide that described double carbide hard phase is contained is TiC, VC, ZrC, WC, B
4C, SiC, TaC and Mo
2C; Each carbide in each double carbide accounts for the percentage ratio of this double carbide weight between 5% to 90%, and the weight percentage sum of each carbide is 100% in each double carbide.
2, a kind of high-entropy alloy binder as claimed in claim 1 and double carbide agglomerating Wimet, it is characterized in that: described hard comprises in mutually and adds less important superhard compound, this less important superhard compound is nitride or boride, and the percentage ratio that the weight of this less important superhard compound accounts for hard phase total amount is at most 5wt%.
3, make the method for a kind of high-entropy alloy binder as claimed in claim 1 and double carbide agglomerating Wimet, it is characterized in that: take by weighing double carbide and in ball grinding cylinder, mix with bonding metal-powder mutually, then ball grinding cylinder is put into the high-energy ball milling that ball mill carried out 10 hours at least, the paraffin that adds 1-2wt% in ball grinding cylinder carries out at least 5 hours low energy ball milling again as wetting agent and binding agent then; Being pressed into round embryo after discharging and the drying, is to take off ester and sintering then, and taking off ester is to carry out under 400 ℃ under argon hydrogen mixed atmosphere in vacuum oven, after taking off the ester processing, promptly carries out sintering at 1350 ℃-1500 ℃ under vacuum condition, makes finished product at last.
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| CN 200610034982 CN100526490C (en) | 2006-04-14 | 2006-04-14 | Hard alloy sintered by high-entropy alloy binder and compound carbide and preparation method thereof |
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| CN100526490C true CN100526490C (en) | 2009-08-12 |
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