CN102418000A - Three-dimensional network distributed Ti2AlN particle reinforced TiAl-based composite material and preparation method thereof - Google Patents
Three-dimensional network distributed Ti2AlN particle reinforced TiAl-based composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a three-dimensional network distributed Ti2AlN particle reinforced TiAl-based composite material and a preparation method thereof, and relates to a Ti2AlN particle reinforced TiAl-based composite material and a preparation method thereof. The composite material consists of a Ti2AlN particle reinforcing phase and a TiAl matrix, wherein Ti2AlN particles are distributed in the TiAl matrix in a three-dimensional network shape. The method comprises the following steps of: performing nitriding treatment on titanium powder to obtain nitrided titanium powder, performing hot pressing and sintering on the mixture of the nitrided titanium powder and aluminum powder, and thus obtaining the composite material. The structure of the TiAl matrix is thinned, and the reinforcing phase Ti2AlN particles are distributed in the TiAl matrix in the three-dimensional network shape and encircle the TiAl crystal colonies to form a structure which is more stable than a single TiAl alloy. The composite material has higher structural thermal stability and good long-time service performance under the high-temperature condition, the high-temperature compression strength of the composite material is improved, and the compression strength of the composite material at the temperature of 900 DEG C reaches 958.9MPa.
Description
Technical field
The present invention relates to a kind of Ti
2AlN particle-reinforced TiAl-based composite material and preparation method thereof.
Background technology
Characteristics such as TiAl alloy good high-temperature intensity, creep resistance and oxidation-resistance make it become a kind of lightweight high-temperature structural material that has application potential.But deficiencies such as its temperature-room type plasticity and heat deformability are poor, high temperature undertissue instability have limited its widespread use.Therefore caused extensive concern through introducing the enhancing body with the method for improving the TiAl alloy property.
Adopt Ti
2The AlN pottery is as strengthening body, preparation Ti
2The key of AlN particle-reinforced TiAl-based composite material is how to introduce the third element---nitrogen.The Ti that reports at present
2The preparation method of AlN enhancing TiAl based composites and the problem of existence are following:
(1) spray deposition: in the mixed atmosphere of nitrogen and hydrogen, Ti, Al are ejected on the substrate of prior preheating, the further reaction through subsequently forms the target matrix material.The N element is introduced through Ti, the Al drop surface carburization in flight course.Shortcoming is: the drop flight time is short, and the surface carburization amount is limited, therefore is difficult to control Ti on a large scale
2The volume(tric)fraction of AlN; Be difficult to form single Ti in the material that obtains
2The AlN wild phase also contains the nitride of other kinds on a small quantity; Ti in the gained material
2AlN is wavy distribution, causes material to present anisotropy; The density of material waits further raising.
(2) mechanical alloying method: with Ti, Al powder is starting material, mechanical ball milling under air ambient.The N element infiltrates in the mixed powder through the raising of temperature rise in the knockout process and granule surface activity in the air.Infiltrate the powder process vacuum of N element or under argon gas atmosphere, finally obtain the target matrix material behind the hot pressed sintering.This method shortcoming is in the mechanical milling process, and O and the unavoidable meeting of tank body material element are incorporated in the mixed powder, cause final material impure, contain Al
2O
3Deng the impurity phase; The adsorptive capacity of N element is less, is difficult to control Ti in the matrix material on a large scale
2The volume(tric)fraction of AlN.
(3) hot pressing sintering method: with Ti, Al, TiN powder is raw material; Through batch mixing or ball milling alloying three kinds of feed particles are mixed; And then make three kinds of elements reach the uniform distribution state, behind vacuum or inert gas atmosphere hot pressed sintering, finally obtain the Ti that even dispersion distributes
2AlN particle-reinforced TiAl matrix material.Shortcoming is that three kinds of material powders are difficult to uniform mixing, is prone to cause Ti
2AlN strengthens the body particle agglomeration, needs long-time ball milling to reunite to reduce;
Summary of the invention
The purpose of this invention is to provide the Ti that a kind of three-dimensional network shape distributes
2AlN particle-reinforced TiAl-based composite material and preparation method thereof, the Ti that obtains
2Ti in the AlN particle-reinforced TiAl-based composite material
2AlN particle wild phase is the three-dimensional network shape and is distributed in the TiAl matrix, makes the compressive strength of matrix material improve, and mechanical property is good.
The Ti that three-dimensional network shape of the present invention distributes
2The AlN particle-reinforced TiAl-based composite material is by Ti
2AlN particle wild phase and TiAl matrix are formed, wherein Ti
2The AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix.
The Ti that three-dimensional network shape of the present invention distributes
2The preparation method of AlN particle-reinforced TiAl-based composite material realizes through following steps: one, in flowing nitrogen atmosphere, titanium valve is heated to 500 ℃～600 ℃, and is incubated nitriding 12～48 hours, get the nitriding titanium valve; Two, be that 48: 16～27 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder, the nitriding titanium valve that takes by weighing and aluminium powder mixed the back add ball mill mixing 5～20h behind the liquid dispersant, wet mixed feed, again with wet mixed feed dry mixed powder; Three, put into graphite jig after the mixed powder coldmoulding that step 2 is obtained, again graphite jig is put into hot-pressed sintering furnace and carry out hot pressed sintering and get the Ti that the three-dimensional network shape distributes
2The AlN particle-reinforced TiAl-based composite material, wherein hot-pressing sintering technique is: be warming up to 600 ℃～800 ℃ by room temperature, be forced into 20～60MPa then; Heat-insulation pressure keeping 1～4 hour is warming up to 1250 ℃～1350 ℃ again, and heat-insulation pressure keeping is after 0.5～2 hour; With discharge degree; Be warming up to 1380 ℃～1450 ℃ again, be incubated 0.5 hour, again furnace cooling.
The Ti that the three-dimensional network shape that preparation method of the present invention prepares distributes
2The AlN particle-reinforced TiAl-based composite material is by Ti
2AlN particle wild phase and TiAl matrix are formed, wherein, and Ti
2The AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
With Ti
2The matrix material that the disperse of AlN particle wild phase is distributed in the TiAl matrix is compared, the Ti that the three-dimensional network shape that the present invention prepares distributes
2The AlN particle-reinforced TiAl-based composite material has higher thermal structure stability, and it is good for a long time to stablize the military service performance under the hot conditions, and high temperature compressed intensity improves a lot, and the compressive strength under 900 ℃ reaches 958.9MPa.
Preparing method of the present invention at first obtains the nitriding titanium valve through step 1; The compound of nitriding titanium valve and aluminium powder is in hot pressed sintering process subsequently then; Low-melting aluminium at first melts; In the nitriding titanium valve, spread, form the TiAl alloy powder of surperficial rich nitrogen, original position generates Ti at the contact interface place of TiAl alloy powder subsequently
2The AlN phase, the Ti of generation
2AlN particle wild phase is surrounded the TiAl colony, has stoped the fusion of growing up of TiAl colony, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.Through the nitriding time in the controlled step one, obtain the titanium valve of different nitriding amounts, and then the Ti of control generation
2The amount of AlN, thus the Ti that the three-dimensional network shape distributes be in the control matrix material
2The volume(tric)fraction of AlN; Through the ratio of nitriding titanium valve and aluminium powder in the controlled step two, the composition of regulation and control matrix, and then the microstructure of control TiAl matrix.
The Ti that the three-dimensional network shape that utilizes the hot-pressing sintering technique of step 3 of the present invention to prepare distributes
2The AlN particle-reinforced TiAl-based composite material belongs to near-net-shape, and the part of sintering preparation does not need or a spot of following process of needs.
Description of drawings
Fig. 1 be test 1 preparation the Ti that distributes of three-dimensional network shape
2The scanning electron photomicrograph of AlN particle-reinforced TiAl-based composite material; Fig. 2 is the Ti that the three-dimensional network shape of test 2 preparations distributes
2The scanning electron photomicrograph of AlN particle-reinforced TiAl-based composite material; Fig. 3 is the Ti that the three-dimensional network shape of test 2 preparations distributes
2The X-ray diffraction spectrogram of AlN particle-reinforced TiAl-based composite material wherein, ▲ represent TiAl, ● represent Ti
2AlN, △ represents Ti
3Al.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the Ti that this embodiment distributes for the three-dimensional network shape
2The AlN particle-reinforced TiAl-based composite material, it is by Ti
2AlN particle wild phase and TiAl matrix are formed, wherein Ti
2The AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix.
The Ti that the three-dimensional network shape of this embodiment distributes
2In the AlN particle-reinforced TiAl-based composite material, wild phase Ti
2The AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The Ti that the three-dimensional network shape of this embodiment distributes
2In the AlN particle-reinforced TiAl-based composite material, Ti
2The volume(tric)fraction of AlN particle wild phase is about 10%～70%, and all the other are the TiAl matrix.
With Ti
2The matrix material that the disperse of AlN particle wild phase is distributed in the TiAl matrix is compared, the Ti that the three-dimensional network shape of this embodiment distributes
2The AlN particle-reinforced TiAl-based composite material has higher thermal structure stability, and it is good for a long time stablize the military service performance under the hot conditions, reaches high temperature compressed intensity and also increases, and the compressive strength under 900 ℃ reaches 958.9MPa.
Embodiment two: this embodiment is the Ti that embodiment one described three-dimensional network shape distributes
2The preparation method of AlN particle-reinforced TiAl-based composite material, it is realized through following steps: one, in flowing nitrogen atmosphere, titanium valve is heated to 500 ℃～600 ℃, and is incubated nitriding 12～48 hours, get the nitriding titanium valve; Two, be that 48: 16～27 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder, the nitriding titanium valve that takes by weighing and aluminium powder mixed the back add ball mill mixing 5～20h behind the liquid dispersant, wet mixed feed, again with wet mixed feed dry mixed powder; Three, put into graphite jig after the mixed powder coldmoulding that step 2 is obtained, again graphite jig is put into hot-pressed sintering furnace and carry out hot pressed sintering and get the Ti that the three-dimensional network shape distributes
2The AlN particle-reinforced TiAl-based composite material, wherein hot-pressing sintering technique is: be warming up to 600 ℃～800 ℃ by room temperature, be forced into 20～60MPa then; Heat-insulation pressure keeping 1～4 hour is warming up to 1250 ℃～1350 ℃ again, and heat-insulation pressure keeping is after 0.5～2 hour; With discharge degree; Be warming up to 1380 ℃～1450 ℃ again, be incubated 0.5 hour, again furnace cooling.
The Ti that the three-dimensional network shape that this embodiment preparation method prepares distributes
2The AlN particle-reinforced TiAl-based composite material is by Ti
2AlN particle wild phase and TiAl matrix are formed, wherein, and wild phase Ti
2The AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The preparation method of this embodiment at first obtains the nitriding titanium valve through step 1; The compound of nitriding titanium valve and aluminium powder is in the hot pressed sintering process then; Low-melting aluminium at first melts; In the nitriding titanium valve, spread, form the TiAl alloy powder of surperficial rich nitrogen, original position generates Ti at the contact interface place of TiAl alloy powder subsequently
2The AlN phase, the Ti of generation
2AlN particle wild phase is surrounded the TiAl colony, has stoped the fusion of growing up of TiAl colony, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.Through the nitriding time in the controlled step one, obtain the titanium valve of different nitriding amounts, and then the Ti of control generation
2The amount of AlN, thus the Ti that the three-dimensional network shape distributes be in the control matrix material
2The volume(tric)fraction of AlN; Through the ratio of nitriding titanium valve and aluminium powder in the controlled step two, the composition of regulation and control matrix, and then the microstructure of control TiAl matrix.
The Ti that the three-dimensional network shape that utilizes the hot-pressing sintering technique of this embodiment step 3 to prepare distributes
2The AlN particle-reinforced TiAl-based composite material belongs to near-net-shape, and the part of sintering preparation does not need or a spot of following process of needs.
Embodiment three: this embodiment and embodiment two are different be in the step 1 in flowing nitrogen atmosphere, titanium valve is heated to 600 ℃, and insulation nitriding 24 hours, the nitriding titanium valve.Other step and parameter are identical with embodiment two.
Embodiment four: what this embodiment was different with embodiment two or three is that flowing nitrogen atmosphere is the gas flow rate mobile with 400～600 ml/min in the step 1.Other step and parameter are identical with embodiment two or three.
Preferably, mobile in this embodiment with the gas flow rate of 500 ml/min.
Embodiment five: this embodiment and embodiment two, three or four are different is to be that 48: 20.25 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder in the step 2.Other step and parameter are identical with embodiment two, three or four.
Embodiment six: this embodiment is different with one of embodiment two to five is that the concrete parameter of ball mill mixing in the step 2 is: ball material mass ratio is 5: 1, and rotating speed is 100～150r/min, and mixing time is 5～20 hours.Other step and parameter are identical with one of embodiment two to five.
This embodiment medium speed is 120r/min preferably.
Embodiment seven: what this embodiment was different with one of embodiment two to six is that hot-pressing sintering technique is in the step 3: be warming up to 650 ℃～750 ℃ by room temperature, be forced into 30～50MPa then, heat-insulation pressure keeping 1.5～3 hours; Be warming up to 1280 ℃～1320 ℃ again; Behind the heat-insulation pressure keeping 0.8～1.5 hour,, be warming up to 1380 ℃～1400 ℃ again with discharge degree; Be incubated 0.5 hour, again furnace cooling.Other step and parameter are identical with one of embodiment two to six.
Embodiment eight: what this embodiment was different with one of embodiment two to six is that hot-pressing sintering technique is in the step 3: be warming up to 700 ℃ by room temperature, be forced into 40MPa then, heat-insulation pressure keeping 2 hours; Be warming up to 1300 ℃ again; Behind the heat-insulation pressure keeping 1 hour,, be warming up to 1380 ℃ again with discharge degree; Be incubated 0.5 hour, again furnace cooling.Other step and parameter are identical with one of embodiment two to six.
Embodiment nine: this embodiment is different with one of embodiment two to eight is that the control temperature rise rate is 5～15 ℃/minute in the temperature-rise period of hot-pressing sintering technique in the step 3.Other step and parameter are identical with one of embodiment two to eight.
Preferably, the control temperature rise rate is 10 ℃/minute in this embodiment.
In order to verify beneficial effect of the present invention, test as follows:
Test 1: the Ti that the three-dimensional network shape distributes
2The preparation method of AlN particle-reinforced TiAl-based composite material, it is realized through following steps: one, in flowing nitrogen atmosphere, titanium valve is heated to 600 ℃, and is incubated nitriding 12 hours, get the nitriding titanium valve; Two, be that 48: 27 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder, the nitriding titanium valve that takes by weighing and aluminium powder mixed the back add ball mill mixing 20h behind the liquid dispersant, wet mixed feed, again with wet mixed feed dry mixed powder; Three, put into graphite jig after the mixed powder coldmoulding that step 2 is obtained, again graphite jig is put into hot-pressed sintering furnace and carry out hot pressed sintering and get the Ti that the three-dimensional network shape distributes
2The AlN particle-reinforced TiAl-based composite material, wherein hot-pressing sintering technique is: be warming up to 700 ℃ by room temperature, be forced into 40MPa then; Heat-insulation pressure keeping 2 hours is warming up to 1300 ℃ again, and heat-insulation pressure keeping is after 1 hour; With discharge degree, be warming up to 1380 ℃ again, be incubated 0.5 hour; Furnace cooling again, the control temperature rise rate is 10 ℃/minute in the temperature-rise period.
In the gas flow rate flowing nitrogen atmosphere with 500 ml/min in the step 1 of test 1.The concrete parameter of ball mill mixing in the step 2 is: ball material mass ratio is 5: 1, and rotating speed is 120r/min, and mixing time is 20 hours.
The Ti that the three-dimensional network shape that test 1 prepares distributes
2The scanning electron photomicrograph of AlN particle-reinforced TiAl-based composite material is as shown in Figure 1, and is visible by Fig. 1, the Ti that the three-dimensional network shape for preparing distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The enhancing of AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The Ti that the three-dimensional network shape that test 1 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The volume(tric)fraction of AlN particle wild phase is about 20%, and all the other are the TiAl matrix.
900 ℃, strain rate 10
-2s
-1Test condition under, to testing the Ti that the 1 three-dimensional network shape that obtains distributes
2The AlN particle-reinforced TiAl-based composite material carries out the compressive strength test, and recording its compressive strength is 793.2MPa.As a comparison, adopt the Ti of existing open preparing method's preparation
2AlN particle wild phase percent by volume is 20% Ti
2The disperse of AlN particle wild phase is distributed in the matrix material in the TiAl matrix, and adopting above-mentioned compressive strength test condition to record its compressive strength is 748.8MPa.
Test 2: differently with test 1 be, in flowing nitrogen atmosphere, titanium valve be heated to 600 ℃ and insulation in the step 1, nitriding 24 hours, the nitriding titanium valve; Be that 48: 20.25 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder in the step 2, the nitriding titanium valve that takes by weighing and aluminium powder mixed the back add ball mill mixing 20h behind the liquid dispersant, wet mixed feed, again with wet mixed feed dry mixed powder.Other step and parameter are identical with test 1.
The Ti that the three-dimensional network shape that test 2 prepares distributes
2The scanning electron photomicrograph of AlN particle-reinforced TiAl-based composite material is as shown in Figure 2, and is visible by Fig. 2, the Ti that the three-dimensional network shape for preparing distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The enhancing of AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The Ti that the three-dimensional network shape that test 2 prepares distributes
2The X-ray diffraction spectrogram of AlN particle-reinforced TiAl-based composite material is as shown in Figure 3, among the figure, ▲ represent TiAl, ● represent Ti
2AlN, △ represents Ti
3Al.Visible by Fig. 3, the matrix material of test 2 preparations is by Ti
2AlN phase and TiAl phase composite also have a spot of Ti
3The Al phase.
The Ti that the three-dimensional network shape that test 2 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The volume(tric)fraction of AlN particle wild phase is about 50%, and all the other are the TiAl matrix.
At 900 ℃, strain rate 10
-2Test condition under, to testing the Ti that the 2 three-dimensional network shapes that obtain distribute
2The AlN particle-reinforced TiAl-based composite material carries out the compressive strength test, and recording its compressive strength is 958.9MPa.Compressive strength (683.1MPa) than under 900 ℃ of existing Ti-47A alloy has improved a lot.
As a comparison, adopt the Ti of existing open preparing method's preparation
2AlN particle wild phase percent by volume is 50% Ti
2The disperse of AlN particle wild phase is distributed in the matrix material in the TiAl matrix, and adopting above-mentioned compressive strength test condition to record its compressive strength is 798.7MPa.
Test 3: differently with test 1 be, in flowing nitrogen atmosphere, titanium valve be heated to 600 ℃ and insulation in the step 1, nitriding 48 hours, the nitriding titanium valve; Be that 48: 16.2 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder in the step 2, the nitriding titanium valve that takes by weighing and aluminium powder mixed the back add ball mill mixing 20h behind the liquid dispersant, wet mixed feed, again with wet mixed feed dry mixed powder.Other step and parameter are identical with test 1.
The Ti that the three-dimensional network shape that test 3 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The enhancing of AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The Ti that the three-dimensional network shape that test 3 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The volume(tric)fraction of AlN particle wild phase is about 70%, and all the other are the TiAl matrix.
Test 4: differently with test 1 be, in flowing nitrogen atmosphere, titanium valve be heated to 500 ℃ and insulation in the step 1, nitriding 24 hours, the nitriding titanium valve.Other step and parameter are identical with test 1.
The Ti that the three-dimensional network shape that test 4 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The enhancing of AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The Ti that the three-dimensional network shape that test 4 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The volume(tric)fraction of AlN particle wild phase is about 10%, and all the other are the TiAl matrix.
Test 5: differently with test 1 be, in flowing nitrogen atmosphere, titanium valve be heated to 500 ℃ and insulation in the step 1, nitriding 48 hours, the nitriding titanium valve; Be that 48: 20.25 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder in the step 2, the nitriding titanium valve that takes by weighing and aluminium powder mixed the back add ball mill mixing 20h behind the liquid dispersant, wet mixed feed, again with wet mixed feed dry mixed powder.Other step and parameter are identical with test 1.
The Ti that the three-dimensional network shape that test 5 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The enhancing of AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The Ti that the three-dimensional network shape that test 5 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The volume(tric)fraction of AlN particle wild phase is about 15%, and all the other are the TiAl matrix.
Test 6: differently with test 1 be to be that 48: 16.2 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder in the step 2.Other step and parameter are identical with test 1.
The Ti that the three-dimensional network shape that test 6 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The enhancing of AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The Ti that the three-dimensional network shape that test 6 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The volume(tric)fraction of AlN particle wild phase is about 20%, and all the other are the TiAl matrix.
Test 7: differently with test 1 be to be that 48: 20.25 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder in the step 2.Other step and parameter are identical with test 1.
The Ti that the three-dimensional network shape that test 7 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The enhancing of AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix, and the TiAl colony is surrounded, and the TiAl matrix is formed a kind of than the more stable tissue of single TiAl base alloy by refinement.
The Ti that the three-dimensional network shape that test 7 prepares distributes
2Ti in the AlN particle-reinforced TiAl-based composite material
2The volume(tric)fraction of AlN particle wild phase is about 20%, and all the other are the TiAl matrix.
Claims (9)
1. the Ti that distributes of a three-dimensional network shape
2The AlN particle-reinforced TiAl-based composite material is characterized in that the Ti that the three-dimensional network shape distributes
2The AlN particle-reinforced TiAl-based composite material is by Ti
2AlN particle wild phase and TiAl matrix are formed, wherein Ti
2The AlN particle is the three-dimensional network shape and is distributed in the TiAl matrix.
2. the Ti that a kind of three-dimensional network shape as claimed in claim 1 distributes
2The preparation method of AlN particle-reinforced TiAl-based composite material is characterized in that the Ti that the three-dimensional network shape distributes
2The preparation method of AlN particle-reinforced TiAl-based composite material realizes through following steps: one, in flowing nitrogen atmosphere, titanium valve is heated to 500 ℃～600 ℃, and is incubated nitriding 12～48 hours, get the nitriding titanium valve; Two, be that 48: 16～27 ratio takes by weighing nitriding titanium valve and aluminium powder in the mass ratio of nitriding titanium valve and aluminium powder, the nitriding titanium valve that takes by weighing and aluminium powder mixed the back add ball mill mixing 5～20h behind the liquid dispersant, wet mixed feed, again with wet mixed feed dry mixed powder; Three, put into graphite jig after the mixed powder coldmoulding that step 2 is obtained, again graphite jig is put into hot-pressed sintering furnace and carry out hot pressed sintering and get the Ti that the three-dimensional network shape distributes
2The AlN particle-reinforced TiAl-based composite material, wherein hot-pressing sintering technique is: be warming up to 600 ℃～800 ℃ by room temperature, be forced into 20～60MPa then; Heat-insulation pressure keeping 1～4 hour is warming up to 1250 ℃～1350 ℃ again, and heat-insulation pressure keeping is after 0.5～2 hour; With discharge degree; Be warming up to 1380 ℃～1450 ℃ again, be incubated 0.5 hour, again furnace cooling.
3. the Ti that a kind of three-dimensional network shape according to claim 2 distributes
2The preparation method of AlN particle-reinforced TiAl-based composite material is characterized in that in the step 1 in flowing nitrogen atmosphere, titanium valve being heated to 600 ℃, and insulation nitriding 24 hours, the nitriding titanium valve.
4. the Ti that distributes according to claim 2 or 3 described a kind of three-dimensional network shapes
2The preparation method of AlN particle-reinforced TiAl-based composite material is characterized in that flowing nitrogen atmosphere is the gas flow rate mobile with 400～600 ml/min in the step 1.
5. the Ti that distributes according to claim 2 or 3 described a kind of three-dimensional network shapes
2The preparation method of AlN particle-reinforced TiAl-based composite material is characterized in that in the step 2 that mass ratio in nitriding titanium valve and aluminium powder is that 48: 20.25 ratio takes by weighing nitriding titanium valve and aluminium powder.
6. the Ti that distributes according to claim 2 or 3 described a kind of three-dimensional network shapes
2The preparation method of AlN particle-reinforced TiAl-based composite material, it is characterized in that the concrete parameter of ball mill mixing in the step 2 is: ball material mass ratio is 5: 1, and rotating speed is 100～150r/min, and mixing time is 5～20 hours.
7. the Ti that distributes according to claim 2 or 3 described a kind of three-dimensional network shapes
2The preparation method of AlN particle-reinforced TiAl-based composite material is characterized in that hot-pressing sintering technique is in the step 3: be warming up to 650 ℃～750 ℃ by room temperature, be forced into 30～50MPa then; Heat-insulation pressure keeping 1.5～3 hours is warming up to 1280 ℃～1320 ℃ again, and heat-insulation pressure keeping is after 0.8～1.5 hour; With discharge degree; Be warming up to 1380 ℃～1400 ℃ again, be incubated 0.5 hour, again furnace cooling.
8. the Ti that distributes according to claim 2 or 3 described a kind of three-dimensional network shapes
2The preparation method of AlN particle-reinforced TiAl-based composite material is characterized in that hot-pressing sintering technique is in the step 3: be warming up to 700 ℃ by room temperature, be forced into 40MPa then; Heat-insulation pressure keeping 2 hours is warming up to 1300 ℃ again, and heat-insulation pressure keeping is after 1 hour; With discharge degree; Be warming up to 1380 ℃ again, be incubated 0.5 hour, again furnace cooling.
9. the Ti that distributes according to claim 2 or 3 described a kind of three-dimensional network shapes
2The preparation method of AlN particle-reinforced TiAl-based composite material is characterized in that the control temperature rise rate is 5～15 ℃/minute in the temperature-rise period of hot-pressing sintering technique in the step 3.
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| CN112267048B (en) * | 2020-09-02 | 2022-02-25 | 上海交通大学 | Nano Ti-containing2Aluminum-based alloy of AlN particles and method for producing same |
| CN113174515A (en) * | 2021-04-03 | 2021-07-27 | 北京冬曦既驾科技咨询有限公司 | High-toughness aluminum alloy and preparation method thereof |
| CN117363930A (en) * | 2023-12-08 | 2024-01-09 | 成都飞机工业（集团）有限责任公司 | Wear-resistant titanium-aluminum alloy and preparation method thereof |
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