CN101376940A - Morphology controllable tungsten carbide aluminum cemented carbide sintered body - Google Patents
Morphology controllable tungsten carbide aluminum cemented carbide sintered body Download PDFInfo
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- CN101376940A CN101376940A CNA2008100512413A CN200810051241A CN101376940A CN 101376940 A CN101376940 A CN 101376940A CN A2008100512413 A CNA2008100512413 A CN A2008100512413A CN 200810051241 A CN200810051241 A CN 200810051241A CN 101376940 A CN101376940 A CN 101376940A
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Abstract
The invention provides a shape-controlled tungsten carbide aluminum hard alloy sintered body and a preparation method thereof. The expression formula of the shape-controlled tungsten carbide aluminum hard alloy sintered body is (W1-xAlx) C, wherein, the x is equal to 0.1 to 0.86. The microscopic structures are respectively circular particles, plate-shaped particles and fiber-like particles. The preparation method comprises the following steps: partinium powder and carbon black serve as raw materials, are mixed and put into a pyrophillite mould and sintered in a high-pressure device; the relative density of the high-compaction hard alloy sintered body is 98 percent to 99.5 percent which is close to full density. In addition, a controlled hard alloy lump-shaped material with good crystal morphology and microstructure is synthesized by changing the pressure condition.
Description
Technical field
The invention belongs to morphology controllable tungsten carbide aluminum cemented carbide sintered body.
Background technology
Tungsten carbide-aluminum hard alloy is the emerging technology material of researchdevelopment in recent years, and tungsten carbide-aluminum is meant that part A l atom enters the case of tungsten in the WC lattice and the instead type solid solution alloy that forms.It has the high rigidity of wolfram varbide, the lightweight, oxidation-resistance and the good ductility that have had both aluminium on the basis of high-wearing feature again, (density of rich aluminium alloy can reach 3.0g/cm to make alloy have high hardness (microhardness is greater than 25GPa), very high flexural strength (more than the 1500MPa) and lower density
3), developing into novel high rigidity, high strength, good workability, novel hard alloy that oxidation resistance temperature is high, this material is expected at machine tools, glass cutting, forging die, drawing-die, roll, oil well drill pipe, mine drilling tool, dig aspects such as drilling tool and electric contact material is applied.
Tungsten carbide-aluminum and wolfram varbide belong to hexagonal system together, and their lattice size is the same substantially, therefore, tungsten carbide-aluminum is the same with wolfram varbide, and hexagonal structure and section are the equilibrium state structure that three-legged structure is it, and have the nonequilibrium state structure, such as the circular granular structure, the plate-like particles structure, the fibrous particle structure waits the Wimet of no sharp corners to be difficult to obtain.(reference International Journal ofRefractory Metals ﹠amp; Hard Materials 24 (2006) 360-364)
Summary of the invention
Morphology controllable tungsten carbide aluminum cemented carbide sintered body provided by the invention, it is formed available following formula and expresses:
(W
1-xAl
x)C
In the formula: x=0.1-0.86.
The step and the condition of preparation morphology controllable tungsten carbide aluminum cemented carbide sintered body method are as follows: adopt existing cubic apparatus high-tension unit (DS-029C, China, Beijing press instrument factory), selecting tungsten aluminium alloy powder and carbon black is raw material, and this tungsten aluminium alloy powder expression formula is W
1-xAl
x, in the formula, x=0.1-0.86; By stoichiometric ratio 1:1 tungsten aluminium alloy powder and carbon black are mixed, after 400MPa coldmoulding, pack in the agalmatolite mould, with the hexagonal boron nitride is transmission medium, carbon tube is a heating element, sintering under the condition of high voltage of 2.0～5.5GPa, and sintering temperature is 1500 ℃-1600 ℃, sintering time is 5-20 minute, obtains morphology controllable tungsten carbide aluminum cemented carbide sintered body.
By changing the pressure in the sintering process, the sintered compact that can obtain to have the diverse microcosmic structure.When institute's applied pressure is a sintering under the 4.5-5.5GPa condition, in the time of sintering temperature 1400-1600 ℃, can obtain to have the cemented carbide sintered body of fibrous particle; When institute's applied pressure is a sintering under the 3.0-4.0GPa condition, in the time of sintering temperature 1400-1600 ℃, can obtain to have the cemented carbide sintered body of plate-like particles; When institute's applied pressure is 2.0-, sintering under the 2.5GPa condition in the time of sintering temperature 1400-1600 ℃, can obtain to have the cemented carbide sintered body of circular granular.The relative density of above-mentioned sintered compact is 98-99.5%.Approach full densification.
Beneficial effect: the present invention obtains having the nonequilibrium state structure, such as the circular granular structure, and plate-like particles structure, the cemented carbide sintered body of no sharp corners such as fibrous particle structure.By changing the pressure in the sintering process, the sintered compact that can obtain to have the diverse microcosmic structure.When institute's applied pressure is 4.5-5.5GPa, in the time of sintering temperature 1400-1600 ℃, can obtain to have the cemented carbide sintered body of fibrous particle; When institute's applied pressure is 3.0-4.0GPa, in the time of sintering temperature 1400-1600 ℃, can obtain to have the cemented carbide sintered body of plate-like particles; When institute's applied pressure is 2.0-2.5GPa, in the time of sintering temperature 1400-1600 ℃, can obtain to have the cemented carbide sintered body of circular granular.The relative density of above-mentioned sintered compact is 98-99.5%.Approach full densification.
Fig. 1,2 and 3 is fracture scanning electron microscope pictures of morphology controllable tungsten carbide aluminum cemented carbide sintered body.Can be clear that from the scanning electron microscope picture by the method that situ high pressure generates, preparing of success has circular configuration, the tungsten carbide-aluminum hard alloy body of platy structure and fibrous texture.It is raw material that the present invention adopts tungsten aluminium alloy powder (reference China Patent No. ZL01129545.7) and carbon black, adopts existing cubic apparatus high-tension unit (DS-029C, China, Beijing press instrument factory.) utilize method of in-situ generation to prepare the tungsten carbide-aluminum hard alloy with diverse microcosmic structure.Apply hyperpressure when applying temperature in the sintering process, impel combination, Cheng Jian between the particle, realize the no agglutinant densification sintering of powder, and, obtain sintered compact with diverse microcosmic structure by changing pressure.High-pressure sinter not only can suppress particulate oxidation behavior in the sintering process, and the pressure of superelevation can also guarantee to finish at short notice densification in the sintering process.It is simple that this method has technology, easy to operate, and sintering time is short: insulation can realize characteristics such as nearly densification sintering in 5 to 10 minutes under sintering temperature.
Description of drawings
Fig. 1 is the profile scanning Electronic Speculum figure of the morphology controllable tungsten carbide aluminum cemented carbide sintered body of fibrous particle.
Fig. 2 is the profile scanning Electronic Speculum figure of the morphology controllable tungsten carbide aluminum cemented carbide sintered body of plate-like particles.
Fig. 3 is the profile scanning Electronic Speculum figure of the morphology controllable tungsten carbide aluminum cemented carbide sintered body of circular granular.
Embodiment
Embodiment 1: with 4 gram (W
0.9Al
0.1) and 0.286 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.To survey mechanical property as follows.
Embodiment 2: with 4 gram (W
0.9Al
0.1) and 0.286 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 3: with 4 gram (W
0.9Al
0.1) and 0.286 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carry out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. to survey mechanical property as follows.
Embodiment 4: with 4 gram (W
0.8Al
0.2) and 0.315 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.To survey mechanical property as follows.
Embodiment 5: with 4 gram (W
0.8Al
0.2) and 0.315 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 6: with 4 gram (W
0.8Al
0.2) and 0.315 gram carbon black mixing, put into the agalmatolite mould after the 400 MPa coldmouldings, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carry out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. to survey mechanical property as follows
Embodiment 7: with 3.5 gram (W
0.7Al
0.3) and 0.308 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.To survey mechanical property as follows.
Embodiment 8: with 3.5 gram (W
0.7Al
0.3) and 0.308 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 9: with 3.5 gram (W
0.7Al
0.3) and 0.308 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carrying out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. the mechanical property of surveying is shown as showing down.
Embodiment 10: with 3.5 gram (W
0.6Al
0.4) and 0.347 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.Sample is through polished finish, and it is as follows to survey mechanical property.
Embodiment 11: with 3.5 gram (W
0.6Al
0.4) and 0.347 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 12: with 3.5 gram (W
0.6Al
0.4) and 0.347 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carry out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. to survey mechanical property as follows.
Embodiment 13: with 3.5 gram (W
0.5Al
0.5) and 0.400 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.To survey mechanical property as follows.
Embodiment 14: with 3.5 gram (W
0.5Al
0.5) and 0.400 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 15: with 3.5 gram (W
0.5Al
0.5) and 0.400 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carry out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. to survey mechanical property as follows.
Embodiment 16: with 3.5 gram (W
0.4Al
0.6) and 0.469 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.To survey mechanical property as follows.
Embodiment 17: with 3.5 gram (W
0.4Al
0.6) and 0.469 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 18: with 3.5 gram (W
0.4Al
0.6) and 0.469 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carry out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. the mechanical property of surveying it is as shown in the table.
Embodiment 19: with 3 gram (W
0.3Al
0.7) and 0.487 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.To survey mechanical property as follows.
Embodiment 20: with 3 gram (W
0.3Al
0.7) and 0.487 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 21: with 3 gram (W
0.3Al
0.7) and 0.487 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carry out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. to survey mechanical property as follows.
Embodiment 22: with 3 gram (W
0.2Al
0.8) and 0.617 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.To survey mechanical property as follows.
Embodiment 23: with 3 gram (W
0.2Al
0.8) and 0.617 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 24: with 3 gram (W
0.2Al
0.8) and 0.617 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carry out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. to survey mechanical property as follows.
Embodiment 25: with 3 gram (W
0.14Al
0.86) and 0.736 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 4.5GPa, 1600 ℃; 5.0GPa, 1500 ℃; 5.5GPa, carrying out high-pressure sinter under 1400 ℃ of conditions, sintering time is 10 minutes, obtains having the cemented carbide sintered body of fibrous particle.To survey mechanical property as follows.
Embodiment 26: with 3 gram (W
0.14Al
0.86) and 0.736 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 3.0GPa, 1600 ℃; 3.5GPa, 1500 ℃; 4.0GPa, carrying out high-pressure sinter under 1400 ℃ the condition, sintering time is 10 minutes, obtains having the cemented carbide sintered body of plate-like particles.To survey mechanical property as follows.
Embodiment 27: with 3 gram (W
0.14Al
0.86) and 0.736 gram carbon black mixing, put into the agalmatolite mould after the 400MPa coldmoulding, with the hexagonal boron nitride transmission medium, carbon tube is a heating element, respectively at 2.0GPa, 1600 ℃; 2.5GPa, carry out high-pressure sinter under 1500 ℃ the high casting die, sintering time is 10 minutes, obtains having the cemented carbide sintered body of circular granular. to survey mechanical property as follows.
Claims (5)
1, morphology controllable tungsten carbide aluminum cemented carbide sintered body is characterized in that, its composition is expressed with following formula:
(W
1-xAl
x)C
In the formula, x=0.1-0.86.
2, the preparation method of morphology controllable tungsten carbide aluminum cemented carbide sintered body as claimed in claim 1, it is characterized in that, its step and condition are as follows: adopt the cubic apparatus high-tension unit, selecting tungsten aluminium alloy powder and carbon black is raw material, and this tungsten aluminium alloy powder expression formula is W
1-xAl
x, x=0.1-0.86 in the formula; By stoichiometric ratio 1:1 tungsten aluminium alloy powder and carbon black are mixed, after 400MPa coldmoulding, pack in the agalmatolite mould, with the hexagonal boron nitride is transmission medium, carbon tube is a heating element, sintering under the condition of high voltage of 2.0～5.5GPa, and sintering temperature is 1400 ℃-1600 ℃, sintering time is 5-20 minute, obtains morphology controllable tungsten carbide aluminum cemented carbide sintered body.
3, the preparation method of morphology controllable tungsten carbide aluminum cemented carbide sintered body as claimed in claim 1 is characterized in that, described condition of high voltage is 4.5-5.5GPa, obtains to have the cemented carbide sintered body of fibrous particle.
4, the preparation method of morphology controllable tungsten carbide aluminum cemented carbide sintered body as claimed in claim 1 is characterized in that, described condition of high voltage is 3.0-4.0GPa, obtains the cemented carbide sintered body with plate-like particles.
5, the preparation method of morphology controllable tungsten carbide aluminum cemented carbide sintered body as claimed in claim 1 is characterized in that, described condition of high voltage is 2.0-, 2.5GPa, and acquisition has the cemented carbide sintered body of circular granular.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109082549A (en) * | 2018-10-26 | 2018-12-25 | 北京理工大学 | A kind of preparation method of easy reacting aluminum/tungsten active material |
-
2008
- 2008-10-07 CN CNA2008100512413A patent/CN101376940A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109082549A (en) * | 2018-10-26 | 2018-12-25 | 北京理工大学 | A kind of preparation method of easy reacting aluminum/tungsten active material |
| CN109082549B (en) * | 2018-10-26 | 2020-08-11 | 北京理工大学 | Preparation method of easy-reaction aluminum/tungsten active material |
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Open date: 20090304 |