CN104550956A - Component preparation method through beta-gamma titanium-aluminum alloy prealloy powder spark plasma sintering - Google Patents
Component preparation method through beta-gamma titanium-aluminum alloy prealloy powder spark plasma sintering Download PDFInfo
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Abstract
The invention relates to a component preparation method through beta-gamma titanium-aluminum alloy prealloy powder spark plasma sintering and relates to the component preparation method. The invention aims at solving the problems that the titanium-aluminum alloy components prepared through the prior art are uneven in component, rough and large in texture and difficult to prepare and mechanically machine. The component preparation method through the beta-gamma titanium-aluminum alloy prealloy powder spark plasma sintering comprises a first method which comprises raw material preparation, spark plasma sintering and subsequent component processing and a second method which comprises raw material preparation, component fabricated part preparation, spark plasma sintering and subsequent component processing. The component preparation method through the beta-gamma titanium-aluminum alloy prealloy powder spark plasma sintering has the advantages of being low in sintering temperature, short in sintering time, small in prepared alloy grain size, high in density, uniform in component, good in performance, beneficial to later fine finishing, energy saving and environmental friendly. The invention is applicable to prepare the component through the beta-gamma titanium-aluminum alloy prealloy powder spark plasma sintering.
Description
Technical field
The present invention relates to the method preparing component.
Background technology
TiAl alloy is a kind of novel light high-temperature structural material, and proportion, less than 50% of nickel-base alloy, has lightweight, the advantage such as high-strength, anti-corrosion, wear-resisting, high temperature resistant.TiAl alloy has the characteristic of metal and covalent bond coexist between the architectural characteristic of atom long-range order and atom, make the elevated temperature strength of its plasticity simultaneously taking into account metal and pottery, compare with nickel base superalloy with conventional titanium alloy, TiAl alloy has the performance advantage such as low-gravity, high creep resistance, be the very potential lightweight high-temperature structural material of one, have broad application prospects at the industrial circle such as Aero-Space, automobile making.But TiAl alloy temperature-room type plasticity is low, high temperature deformation ability, these factors constrain the through engineering approaches application of this alloy.Manufacture method mainly hot investment casting and the hot-working method of current TiAl alloy, thus, is limited by very large by the properties of product of TiAl alloy manufacture and kind.The preparation process of alloy is comparatively complicated, easily there is casting flaw, component segregation and uneven microstructure phenomenon, although can fine tissue be obtained after repeatedly isothermal forging, temperature-room type plasticity increases, but still be difficult to following process and be shaped, realize the preparation of complicated shape and high dimensional accuracy parts.
Now contain gamma phase by common TiAl alloy, alpha (2) phase and a small amount of beta phase, plasticity is low, and deformability is poor.And beta phase has body-centered cubic structure, at high temperature have and more can start slip system, more easily deform.When existing when beta phase is identical with tiny gamma, can significantly promote compatible deformation ability.When Al content not higher than 45% time, there is not peritectic reaction in alloy, solidification path is in process of setting: L → L+beta → beta → alpha+beta → alpha → alpha+gamma → alpha (2)+gamma.Generated by solid-state phase changes by beta phase when high temperature alpha phase is complete, just eliminate the impact of liquid temperature gradient on alpha phase orientation, the final lamella colony structure forming different orientation.In order to obtain better beta phase coagulation result, while reduction Al content, beta phase stable element can be added, as: W, Re, Fe, Mo, Cr, Nb, Ta, V, Mn etc.The elements such as a small amount of B, C and Y can all crystal grain thinning and sheet interlayer spacing.By allocating the composition of TiAl alloy, the phase composition obtained is mainly the novel beta-gamma TiAl alloy of beta phase and gamma phase, there is excellent heat deformability, plasticity be improved significantly, be conducive to the forging of TiAl alloy and the rolling of sheet material, the through engineering approaches of TiAl alloy used and is significant.
Powder metallurgy process not only can be avoided casting and the uneven chemical components, the density that occur and organize the defects such as inconsistent in ingot metallurgy process, and can once make nearly formed product, solves processing difficulties problem and improves the utilization rate of raw material.The methods such as current employing powder metallurgy prepare TiAl alloy some research reports, but usually adopts the manufacture technics such as high temperature insostatic pressing (HIP), hot pressed sintering, and the alloy structure that the method obtains is thick, does not solve the problem that TiAl alloy fragility greatly, is not easily processed.
Summary of the invention
The object of the invention is to solve existing method to prepare TiAl alloy component and there is uneven components, organize thick, preparation difficulty and the difficult problem of machining.And provide beta-gamma TiAl prealloy powder discharge plasma sintering to prepare the method for component.
Beta-gamma TiAl prealloy powder discharge plasma sintering prepares the method for component, specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%);
In Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) described in step one, X is beta phase stable element; Described beta phase stable element is the mixing of one or more in Mo, Cr, Nb, V, W, Fe and Mn; Described Z is micro alloying element; Described micro alloying element is the mixing of one or more in B, C and Y;
Nominal formula described in step one is that the beta-gammaTiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) is prepared through inert gas atomizer technology or PREP technology;
Two, discharge plasma sintering: the beta-gamma TiAl pre-alloyed powder of particle diameter step one taken to be the nominal formula of 0.5 μm ~ 350 μm be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) puts into mould, again the mould containing beta-gamma TiAl pre-alloyed powder is put in discharge plasma sintering stove, continuing the axial compressive force applying 10MPa ~ 150MPa to the mould containing beta-gamma TiAl pre-alloyed powder, is 10 in vacuum
-4under Pa ~ 10Pa by discharge plasma sintering in-furnace temperature with the programming rate of programming rate 20 DEG C/min ~ 200 DEG C/min from room temperature to 950 DEG C ~ 1350 DEG C, 2min ~ 30min is incubated again at temperature is 950 DEG C ~ 1350 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy component after discharge plasma sintering;
The density of the beta-gamma TiAl alloy component after discharge plasma sintering obtained in described step 2 is greater than 99%;
Three, the subsequent treatment of component: fine finishining process is carried out to the beta-gamma TiAl alloy component after discharge plasma sintering, obtains beta-gamma TiAl alloy component.
Beta-gamma TiAl prealloy powder discharge plasma sintering prepares that the method for component specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%);
In Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) described in step one, X is beta phase stable element; Described beta phase stable element is the mixing of one or more in Mo, Cr, Nb, V, W, Fe and Mn; Described Z is micro alloying element; Described micro alloying element is the mixing of one or more in B, C and Y;
Nominal formula described in step one is that the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) is prepared through inert gas atomizer technology or PREP technology;
Two, member preform is prepared: the beta-gamma TiAl pre-alloyed powder of particle diameter step one taken to be the nominal formula of 0.5 μm ~ 350 μm be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) puts into mould, be 20MPa ~ 150MPa at pressure, temperature is 200 DEG C ~ 1350 DEG C, and sintering time is 5min ~ 480min and vacuum is 10
-3suppress under the condition of Pa ~ 10Pa, obtain the member preform of TiAl alloy;
Three, discharge plasma sintering: put in discharge plasma sintering stove by the member preform of TiAl alloy, continuing the axial compressive force applying 10MPa ~ 150MPa to the member preform of TiAl alloy, is 10 in vacuum
-4under Pa ~ 10Pa by discharge plasma sintering in-furnace temperature with programming rate be 20 DEG C/heating rate of min ~ 200 DEG C/min is from room temperature to 950 DEG C ~ 1350 DEG C, 2min ~ 30min is incubated again at temperature is 950 DEG C ~ 1350 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy component of discharge plasma sintering;
Four, the subsequent treatment of component: fine finishining process is carried out to the beta-gamma TiAl alloy component of discharge plasma sintering, obtains beta-gamma TiAl alloy component.
Advantage of the present invention:
One, the present invention carries out discharge plasma sintering to beta-gamma TiAl prealloy powder and prepares component, and required sintering temperature is low, sintering time is short, prepare that the crystallite dimension of alloy is little, density is high, uniform composition, excellent performance; Also there are energy-conserving and environment-protective simultaneously, simple to operate, repeatable strong feature;
Two, the machining property of beta-gamma TiAl alloy component prepared of the present invention is good, and required allowance is few.
Accompanying drawing explanation
Fig. 1 is the structural representation of the mould described in test two step 2; In Fig. 1,1 is the seaming chuck of graphite material, and 2 is the die sleeve of graphite material, and 3 is the beta-gamma TiAl alloy blade that test two step 2 obtains, and 4 is the push-down head of graphite material.
Detailed description of the invention
Detailed description of the invention one: present embodiment is that the method that beta-gamma TiAl prealloy powder discharge plasma sintering prepares component specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%);
In Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) described in step one, X is beta phase stable element; Described beta phase stable element is the mixing of one or more in Mo, Cr, Nb, V, W, Fe and Mn; Described Z is micro alloying element; Described micro alloying element is the mixing of one or more in B, C and Y;
Nominal formula described in step one is that the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) is prepared through inert gas atomizer technology or PREP technology;
Two, discharge plasma sintering: the beta-gamma TiAl pre-alloyed powder of particle diameter step one taken to be the nominal formula of 0.5 μm ~ 350 μm be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) puts into mould, again the mould containing beta-gamma TiAl pre-alloyed powder is put in discharge plasma sintering stove, continuing the axial compressive force applying 10MPa ~ 150MPa to the mould containing beta-gamma TiAl pre-alloyed powder, is 10 in vacuum
-4under Pa ~ 10Pa by discharge plasma sintering in-furnace temperature with the programming rate of programming rate 20 DEG C/min ~ 200 DEG C/min from room temperature to 950 DEG C ~ 1350 DEG C, 2min ~ 30min is incubated again at temperature is 950 DEG C ~ 1350 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy component after discharge plasma sintering;
The density of the beta-gamma TiAl alloy component after discharge plasma sintering obtained in described step 2 is greater than 99%;
Three, the subsequent treatment of component: fine finishining process is carried out to the beta-gamma TiAl alloy component after discharge plasma sintering, obtains beta-gamma TiAl alloy component.
The advantage of present embodiment: one, present embodiment is carried out discharge plasma sintering to beta-gamma TiAl prealloy powder and prepared component, required sintering temperature is low, sintering time is short, prepare that the crystallite dimension of alloy is little, density is high, uniform composition, excellent performance; Also there are energy-conserving and environment-protective simultaneously, simple to operate, repeatable strong feature;
Two, the machining property of beta-gamma TiAl alloy component prepared of present embodiment is good, and required allowance is few.
Detailed description of the invention two: present embodiment and detailed description of the invention one difference are: to take particle diameter in step one be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(41 ~ 44) Al-(2 ~ 9) X-(0.1 ~ 1) Z (at%).Other steps are identical with detailed description of the invention one.
Detailed description of the invention three: one of present embodiment and detailed description of the invention one or two difference is: to take particle diameter in step one be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(42.5 ~ 43.5) Al-(2 ~ 9) X-(0.2 ~ 0.5) Z (at%).Other steps are identical with detailed description of the invention one or two.
Detailed description of the invention four: one of present embodiment and detailed description of the invention one to three difference is: to take particle diameter in step one be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-43Al-9V-0.3Y (at%).Other steps are identical with detailed description of the invention one to three.
Detailed description of the invention five: one of present embodiment and detailed description of the invention one to four difference is: in step 2, the member preform of TiAl alloy is put into discharge plasma sintering stove, continuing the axial compressive force applying 30MPa ~ 120MPa to the member preform of TiAl alloy, is 10 in vacuum
-3under Pa ~ 5Pa by discharge plasma sintering stove with the programming rate of 20 DEG C/min ~ 200 DEG C/min from room temperature to 950 DEG C ~ 1250 DEG C, 2min ~ 30min is incubated again at temperature is 950 DEG C ~ 1250 DEG C, close discharge plasma sintering stove power supply again and be cooled to room temperature, obtain the beta-gamma TiAl alloy component after discharge plasma sintering.Other steps are identical with detailed description of the invention one to four.
Detailed description of the invention six: one of present embodiment and detailed description of the invention one to five difference is: in step 2, the member preform of TiAl alloy is put into discharge plasma sintering stove, continuing the axial compressive force applying 40MPa ~ 100MPa to the member preform of TiAl alloy, is 10 in vacuum
-3under Pa ~ 5Pa by discharge plasma sintering stove with the programming rate of 20 DEG C/min ~ 200 DEG C/min from room temperature to 950 DEG C ~ 1250 DEG C, 5min ~ 20min is incubated again at temperature is 950 DEG C ~ 1250 DEG C, close discharge plasma sintering stove power supply again and be cooled to room temperature, obtain the beta-gamma TiAl alloy component after discharge plasma sintering.Other steps are identical with detailed description of the invention one to five.
Detailed description of the invention seven: present embodiment is that the method that beta-gamma TiAl prealloy powder discharge plasma sintering prepares component specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%);
In Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) described in step one, X is beta phase stable element; Described beta phase stable element is the mixing of one or more in Mo, Cr, Nb, V, W, Fe and Mn; Described Z is micro alloying element; Described micro alloying element is the mixing of one or more in B, C and Y;
Nominal formula described in step one is that the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) is prepared through inert gas atomizer technology or PREP technology;
Two, member preform is prepared: the beta-gamma TiAl pre-alloyed powder of particle diameter step one taken to be the nominal formula of 0.5 μm ~ 350 μm be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) puts into mould, be 20MPa ~ 150MPa at pressure, temperature is 200 DEG C ~ 1350 DEG C, and sintering time is 5min ~ 480min and vacuum is 10
-3suppress under the condition of Pa ~ 10Pa, obtain the member preform of TiAl alloy;
Three, discharge plasma sintering: put in discharge plasma sintering stove by the member preform of TiAl alloy, continuing the axial compressive force applying 10MPa ~ 150MPa to the member preform of TiAl alloy, is 10 in vacuum
-4under Pa ~ 10Pa by discharge plasma sintering in-furnace temperature with programming rate be 20 DEG C/heating rate of min ~ 200 DEG C/min is from room temperature to 950 DEG C ~ 1350 DEG C, 2min ~ 30min is incubated again at temperature is 950 DEG C ~ 1350 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy component of discharge plasma sintering;
Four, the subsequent treatment of component: fine finishining process is carried out to the beta-gamma TiAl alloy component of discharge plasma sintering, obtains beta-gamma TiAl alloy component.
The advantage of present embodiment: one, present embodiment is carried out discharge plasma sintering to beta-gamma TiAl prealloy powder and prepared component, required sintering temperature is low, sintering time is short, prepare that the crystallite dimension of alloy is little, density is high, uniform composition, excellent performance; Also there are energy-conserving and environment-protective simultaneously, simple to operate, repeatable strong feature.
Two, the machining property of beta-gamma TiAl alloy component prepared of present embodiment is good, and required allowance is few.
Detailed description of the invention eight: present embodiment and detailed description of the invention seven with point are: to take particle diameter in step one be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(41 ~ 44) Al-(2 ~ 9) X-(0.1 ~ 1) Z (at%).Other are identical with detailed description of the invention seven to eight.Other are identical with detailed description of the invention seven.
Detailed description of the invention nine: the difference of present embodiment and detailed description of the invention seven or eight is: step 2 sintering process used is 40MPa ~ 100MPa, temperature is 450 DEG C ~ 1300 DEG C, and vacuum is 10
-3~ 8Pa, sintering time is 30min ~ 120min.Other are identical with detailed description of the invention seven or eight.
Detailed description of the invention ten: the difference of present embodiment and detailed description of the invention seven to nine is: in step 3, the member preform of TiAl alloy is put into discharge plasma sintering stove, continuing the axial compressive force applying 40MPa ~ 100MPa to the mould containing beta-gamma TiAl pre-alloyed powder, is 10 in vacuum
-3under Pa ~ 5Pa by discharge plasma sintering stove with the programming rate of 40 DEG C/min ~ 100 DEG C/min from room temperature to 950 DEG C ~ 1250 DEG C, 5min ~ 15min is incubated again at temperature is 950 DEG C ~ 1250 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy component after discharge plasma sintering.Other are identical with detailed description of the invention seven to nine.
Adopt following verification experimental verification advantage of the present invention:
Test one: beta-gamma TiAl prealloy powder discharge plasma sintering prepares the method for component, specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 5 μm ~ 230 μm is the beta-gamma TiAl pre-alloyed powder of Ti-42Al-4Nb-2Cr-0.5W-0.2B (at%);
Nominal formula described in step one is that the beta-gamma TiAl pre-alloyed powder of Ti-42Al-4Nb-2Cr-0.5W-0.2B (at%) is prepared through inert gas atomizer technology;
Two, member preform is prepared: the beta-gamma TiAl pre-alloyed powder of particle diameter step one taken to be the nominal formula of 0.5 μm ~ 230 μm be Ti-42Al-4Nb-2Cr-0.5W-0.2B (at%) puts into the mould of blade shape, be 50MPa at pressure, temperature is 600 DEG C, and sintering time is 50min and vacuum is 10
-2suppress under the condition of Pa, obtain the prefabricated component of TiAl alloy blade shape;
Three, discharge plasma sintering: the prefabricated component of TiAl alloy blade shape is put into discharge plasma sintering stove, continuing the axial compressive force applying 60MPa to the blade prefabricated component containing beta-gamma TiAl, is 10 in vacuum
-2be that the programming rate of 100 DEG C/min is from room temperature to 1050 DEG C by discharge plasma sintering in-furnace temperature with programming rate under Pa, 10min is incubated again at temperature is 1050 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy blade after discharge plasma sintering;
The density of the beta-gamma TiAl alloy blade after discharge plasma sintering that described step 3 obtains is 99.5%;
Four, the subsequent treatment of component: carry out fine finishining process to beta-gamma TiAl alloy vane member, obtains beta-gamma TiAl alloy blade.
Test two: beta-gamma TiAl prealloy powder discharge plasma sintering prepares the method for component, specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 10 μm ~ 120 μm is the beta-gamma TiAl pre-alloyed powder of Ti-43Al-9V-0.3Y (at%);
Nominal formula described in step one is that the beta-gamma TiAl pre-alloyed powder of Ti-43Al-9V-0.3Y (at%) is prepared through PREP technology;
Two, discharge plasma sintering: mould beta-gamma TiAl pre-alloyed powder being put into blade shape, again the mould of the blade shape containing beta-gamma TiAl pre-alloyed powder is put into discharge plasma sintering stove, continuing the axial compressive force applying 60MPa to the mould of the blade shape containing beta-gamma TiAl pre-alloyed powder, is 10 in vacuum
-3be that the programming rate of 100 DEG C/min is from room temperature to 1180 DEG C by discharge plasma sintering in-furnace temperature with programming rate under Pa, 8min is incubated again at temperature is 1180 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy blade after discharge plasma sintering;
The density of the beta-gamma TiAl alloy blade after discharge plasma sintering that described step 2 obtains is 99.5%;
Three, the subsequent treatment of component: carry out fine finishining process to the beta-gamma TiAl alloy blade after discharge plasma sintering, obtains beta-gamma TiAl alloy TiAl alloy blade.
Fig. 1 is the structural representation of the mould described in test two step 2; In Fig. 1,1 is the seaming chuck of graphite material, and 2 is the die sleeve of graphite material, and 3 is the beta-gamma TiAl alloy blade that test two step 2 obtains, and 4 is the push-down head of graphite material.
Test three: beta-gamma TiAl prealloy powder discharge plasma sintering prepares the method for component, specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 5 μm ~ 180 μm is the beta-gamma TiAl pre-alloyed powder of Ti-44Al-5V-4Nb-0.2B-0.1Y (at%);
Nominal formula described in step one is that the beta-gamma TiAl pre-alloyed powder of Ti-44Al-5V-4Nb-0.2B-0.1Y (at%) is prepared through PREP technology;
Two, discharge plasma sintering: mould beta-gamma TiAl pre-alloyed powder being put into air bleeding valve shape, again the mould containing beta-gamma TiAl pre-alloyed powder is put into discharge plasma sintering stove, continuing the axial compressive force applying 80MPa to the mould of the air bleeding valve shape containing beta-gamma TiAl pre-alloyed powder, is 10 in vacuum
-3be that the programming rate of 100 DEG C/min is from room temperature to 1200 DEG C by discharge plasma sintering in-furnace temperature with programming rate under Pa, 8min is incubated again at temperature is 1200 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy air bleeding valve after discharge plasma sintering;
The density of the beta-gamma TiAl alloy air bleeding valve after discharge plasma sintering that described step 3 obtains is 99.5%;
Three, the subsequent treatment of component: carry out fine finishining process to the beta-gamma TiAl alloy air bleeding valve after discharge plasma sintering, obtains beta-gamma TiAl alloy TiAl alloy air bleeding valve.
Claims (10)
1.beta-gamma TiAl prealloy powder discharge plasma sintering prepares the method for component, it is characterized in that beta-gammaTiAl prealloy powder discharge plasma sintering prepares that the method for component specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%);
In Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) described in step one, X is beta phase stable element; Described beta phase stable element is the mixing of one or more in Mo, Cr, Nb, V, W, Fe and Mn; Described Z is micro alloying element; Described micro alloying element is the mixing of one or more in B, C and Y;
Nominal formula described in step one is that the beta-gammaTiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) is prepared through inert gas atomizer technology or PREP technology;
Two, discharge plasma sintering: the beta-gamma TiAl pre-alloyed powder of particle diameter step one taken to be the nominal formula of 0.5 μm ~ 350 μm be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) puts into mould, again the mould containing beta-gamma TiAl pre-alloyed powder is put in discharge plasma sintering stove, continuing the axial compressive force applying 10MPa ~ 150MPa to the mould containing beta-gamma TiAl pre-alloyed powder, is 10 in vacuum
-4under Pa ~ 10Pa by discharge plasma sintering in-furnace temperature with the programming rate of programming rate 20 DEG C/min ~ 200 DEG C/min from room temperature to 950 DEG C ~ 1350 DEG C, 2min ~ 30min is incubated again at temperature is 950 DEG C ~ 1350 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy component after discharge plasma sintering;
The density of the beta-gamma TiAl alloy component after discharge plasma sintering obtained in described step 2 is greater than 99%;
Three, the subsequent treatment of component: fine finishining process is carried out to the beta-gamma TiAl alloy component after discharge plasma sintering, obtains beta-gamma TiAl alloy component.
2. beta-gamma TiAl prealloy powder discharge plasma sintering according to claim 1 prepares the method for component, and to it is characterized in that taking in step one particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(41 ~ 44) Al-(2 ~ 9) X-(0.1 ~ 1) Z (at%).
3. beta-gamma TiAl prealloy powder discharge plasma sintering according to claim 1 prepares the method for component, and to it is characterized in that taking in step one particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(42.5 ~ 43.5) Al-(2 ~ 9) X-(0.2 ~ 0.5) Z (at%).
4. beta-gamma TiAl prealloy powder discharge plasma sintering according to claim 1 prepares the method for component, and to it is characterized in that taking in step one particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-43Al-9V-0.3Y (at%).
5. beta-gamma TiAl prealloy powder discharge plasma sintering according to claim 1 prepares the method for component, it is characterized in that, in step 2, the member preform of TiAl alloy is put into discharge plasma sintering stove, continuing the axial compressive force applying 30MPa ~ 120MPa to the member preform of TiAl alloy, is 10 in vacuum
-3under Pa ~ 5Pa by discharge plasma sintering stove with the programming rate of 20 DEG C/min ~ 200 DEG C/min from room temperature to 950 DEG C ~ 1250 DEG C, 2min ~ 30min is incubated again at temperature is 950 DEG C ~ 1250 DEG C, close discharge plasma sintering stove power supply again and be cooled to room temperature, obtain the beta-gamma TiAl alloy component after discharge plasma sintering.
6. a kind of beta-gamma TiAl prealloy powder discharge plasma sintering according to claim 1 prepares the method for component, it is characterized in that, in step 2, the member preform of TiAl alloy is put into discharge plasma sintering stove, continuing the axial compressive force applying 40MPa ~ 100MPa to the member preform of TiAl alloy, is 10 in vacuum
-3under Pa ~ 5Pa by discharge plasma sintering stove with the programming rate of 20 DEG C/min ~ 200 DEG C/min from room temperature to 950 DEG C ~ 1250 DEG C, 5min ~ 20min is incubated again at temperature is 950 DEG C ~ 1250 DEG C, close discharge plasma sintering stove power supply again and be cooled to room temperature, obtain the beta-gamma TiAl alloy component after discharge plasma sintering.
7.beta-gamma TiAl prealloy powder discharge plasma sintering prepares the method for component, it is characterized in that beta-gammaTiAl prealloy powder discharge plasma sintering prepares that the method for component specifically completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%);
In Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) described in step one, X is beta phase stable element; Described beta phase stable element is the mixing of one or more in Mo, Cr, Nb, V, W, Fe and Mn; Described Z is micro alloying element; Described micro alloying element is the mixing of one or more in B, C and Y;
Nominal formula described in step one is that the beta-gammaTiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) is prepared through inert gas atomizer technology or PREP technology;
Two, member preform is prepared: the beta-gamma TiAl pre-alloyed powder of particle diameter step one taken to be the nominal formula of 0.5 μm ~ 350 μm be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 1) Z (at%) puts into mould, be 20MPa ~ 150MPa at pressure, temperature is 200 DEG C ~ 1350 DEG C, and sintering time is 5min ~ 480min and vacuum is 10
-3suppress under the condition of Pa ~ 10Pa, obtain the member preform of TiAl alloy;
Three, discharge plasma sintering: put in discharge plasma sintering stove by the member preform of TiAl alloy, continuing the axial compressive force applying 10MPa ~ 150MPa to the member preform of TiAl alloy, is 10 in vacuum
-4under Pa ~ 10Pa by discharge plasma sintering in-furnace temperature with programming rate be 20 DEG C/heating rate of min ~ 200 DEG C/min is from room temperature to 950 DEG C ~ 1350 DEG C, 2min ~ 30min is incubated again at temperature is 950 DEG C ~ 1350 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy component of discharge plasma sintering;
Four, the subsequent treatment of component: fine finishining process is carried out to the beta-gamma TiAl alloy component of discharge plasma sintering, obtains beta-gamma TiAl alloy component.
8. a kind of beta-gamma TiAl prealloy powder discharge plasma sintering according to claim 7 prepares the method for component, and to it is characterized in that taking in step one particle diameter be the nominal formula of 0.5 μm ~ 350 μm is the beta-gamma TiAl pre-alloyed powder of Ti-(41 ~ 44) Al-(2 ~ 9) X-(0.1 ~ 1) Z (at%).
9. beta-gamma TiAl prealloy powder discharge plasma sintering according to claim 7 prepares the method for component, it is characterized in that step 2 sintering process used is 40MPa ~ 100MPa, and temperature is 450 DEG C ~ 1300 DEG C, and vacuum is 10
-3~ 8Pa, sintering time is 30min ~ 120min.
10. a kind of beta-gamma TiAl prealloy powder discharge plasma sintering according to claim 7 prepares the method for component, it is characterized in that, in step 3, the member preform of TiAl alloy is put into discharge plasma sintering stove, continuing the axial compressive force applying 40MPa ~ 100MPa to the mould containing beta-gamma TiAl pre-alloyed powder, is 10 in vacuum
-3under Pa ~ 5Pa by discharge plasma sintering stove with the programming rate of 40 DEG C/min ~ 100 DEG C/min from room temperature to 950 DEG C ~ 1250 DEG C, 5min ~ 15min is incubated again at temperature is 950 DEG C ~ 1250 DEG C, close discharge plasma sintering stove power supply again, cool to room temperature with the furnace, obtain the beta-gamma TiAl alloy component after discharge plasma sintering.
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