CN108165865A - A kind of novel TiAl-base alloy material and preparation method - Google Patents
A kind of novel TiAl-base alloy material and preparation method Download PDFInfo
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- CN108165865A CN108165865A CN201711439381.3A CN201711439381A CN108165865A CN 108165865 A CN108165865 A CN 108165865A CN 201711439381 A CN201711439381 A CN 201711439381A CN 108165865 A CN108165865 A CN 108165865A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/003—Alloys based on aluminium containing at least 2.6% of one or more of the elements: tin, lead, antimony, bismuth, cadmium, and titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0005—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with at least one oxide and at least one of carbides, nitrides, borides or silicides as the main non-metallic constituents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a kind of novel TiAl-base alloy material and preparation methods.The alloy material is by Ti, Al, Cr, Nb, B, Y2O3, TiC powder hot pressed sintering forms.By following mole mass fractions of pressing 1% ~ 3%Y is weighed for 45%Al, 2%Cr, 8%Nb, 1%B, 44%Ti, then by mass fraction2O3, 2.5% ~ 10%TiC.Compared with common TiAl-base alloy, Y is added in by a certain percentage in TiAl-base alloy of the present invention2O3Powder and TiC hard particles.In Y2O3Under being acted on TiC, the microstructure of alloy has a significant refinement, and larger lamellar microstructure is reduced in sintered body, and unevenness, which homogenizes degree, reduces the mechanical property of material and wear resistance large increase simultaneously.
Description
Technical field
The invention belongs to powder metallurgy new material technology fields, and in particular to a kind of novel TiAl-base alloy material and its system
Preparation Method belongs to the metallic composite field in metal metallurgy smelting.
Background technology
TiAl alloy is the alloy that a kind of density is small, specific strength is high, fatigue strength is high, high-temperature oxidation resistance is strong, at present
In Japan, Germany, U.S. etc., some national Major Airlines realize such as the commercialization large-scale production of TiAl-base alloy
Boeing 787 and 747-8 airline carriers of passengers engine manufacture turbo blade using TiAl alloy, and engine loss of weight about 200kg, this is to boat
The developmental research of empty engine is of great significance
But when temperature is more than 850 DEG C, intensity, high-temperature oxidation resistance and the croop property of common TiAl based alloys have
It and is remarkably decreased.Simultaneously TiAl-base alloy temperature-room type plasticity is relatively low, heat deformability is poor and high-temperature oxidation resistance insufficient this is tight
The broader applications of TiAl based alloys are limited again.
Therefore it is badly in need of developing a kind of good mechanical properties, temperature-room type plasticity is excellent, the excellent novel TiAl of wear resistance
Base alloy material.
Invention content
In order to overcome above-mentioned technical deficiency, the present invention provides a kind of novel TiAl-base alloy material and preparation methods.
With Y2O3It is reinforced phase with TiC, which has good microstructure, mechanical property and wear resistance.
Above-mentioned material using molal weight weigh than component as：44%Ti, 45%Al, 2%Cr, 5%Nb, 1%B, then by quality
Score weighs 0.2% ~ 0.8%Y2O3, 2.5% ~ 10%TiC.The chemical composition of alloy is Ti45Al5Nb2Cr1B/ (1 ~ 3) Y2O3
(2.5-10)TiC。
In said program, the specification of TiC is 99%, 50nm；The specification of Y2O3 is 99.99%, 50nm.
Ti powder, Al powder, Nb powder, Cr powder, B powder in said program, more than 99% average size purity, 325 mesh or so
The preparation method of novel TiAl-base alloy of the present invention, includes the following steps：
（1）Batch mixing：Powder is weighed in vacuum environment, is uniformly mixed, is put into ball grinder and is filled with argon gas guarantor
Shield, then ball milling 8 hours, rotating speed 200r/min turn 7min, stop 5min.The addition 1.5% in mixed-powder before ball milling
Stearic acid prevents the powder caused by ball milling temperature and energy are excessively high from generating serious soldering bonding, influences the quality of powder, Ran Houfang
It puts 6 hours, obtains TiAl base mixed-powders；
（2）Compacting：By step 1）In obtained mixed-powder be attached in mold, be pressed；
（3）Sintering：The raw embryo of compression moulding is put into vacuum sintering funace, at 0 ~ 600 DEG C with 10 DEG C/min, at 600 DEG C
Keep the temperature 40min；It is heated up at 600 ~ 900 DEG C with 8 DEG C/min；It is heated up at 900 ~ 1100 DEG C with 6 DEG C/min, at 1100 DEG C
Shi Baowen 30min；It is heated up at 1100 ~ 1250 DEG C with 5 DEG C/min, 30min is kept the temperature at 1250 DEG C；When temperature reaches 600 DEG C
When pressurize 20Mpa to 1100 DEG C, then increase pressure for 30Mpa until 1250 DEG C of heat preservations terminate, finally cooling come out of the stove, completion work
Part.
Y2O3Mainly by hindering the crystal grain thinning tissue of grow up realization of the alloy in process of setting crystal grain, addition is certain
The nano level Y of amount2O3TiAl intensity and plasticity can effectively be promoted；With Y2O3The raising of additive amount, TiAl alloys
Hardness also have increase by a relatively large margin.
TiC particles are a kind of and with the good toughness of metal material and excellent wear-resisting, anti-corrosion and heat resistance ceramics
Material, while TiC particles have good compatibility with TiAl compounds, simultaneously because TiC pellet hardnesses are higher than matrix, therefore
Abrasion can be efficiently reduced, while the friction factor of alloy is smaller and stable.
The beneficial effects of the invention are as follows：Compared with common TiAl-base alloy, in TiAl-base alloy of the present invention
Y is added in by a certain percentage2O3Powder and TiC hard particles.In Y2O3Under being acted on TiC, the microstructure of alloy has significantly carefully
Change, larger lamellar microstructure is reduced in sintered body, and unevenness, which homogenizes degree, reduces the mechanical behavior under high temperature and rub resistance of material simultaneously
Polishing machine large increase.And it is aided with Nb powder, Cr powder, B powder, TiAl bases can be further promoted after mixing, suppressing, be sintered
The mechanical property of alloy, particularly in mechanical behavior under high temperature.
Specific embodiment
A kind of preparation method of new type high temperature TiAl alloy of the present invention carries out according to the following steps
First, Ti powder, Al powder, Nb powder, Cr powder, B powder, Y are selected2O3Powder and TiC hard particles are material, wherein Ti powder purities
It is 99.99%, grain size is more than 300 mesh；Al powder purities are 99.9%, 200 ~ 400 mesh of grain size；Nb powder purities are 99.95%, and grain size is big
In 325 mesh；Cr powder purities are 99.5%, and grain size is more than 325 mesh；B powder purities are 99.99%, and grain size is less than 20um；Y2O3Powder is pure
It is 99.99% to spend, grain size 50nm；TiC hard particles purity is 99%, grain size 50nm.45%Al is weighed with molal weight ratio,
2%Cr, 5%Al, 1%B, 44%Ti are weighed with mass fraction（0.1%~0.3%）Y2O3,（2.5%~10%）TiC.
2nd, powder in step 1 in vacuum environment is weighed and uniformly mixed, be put into ball grinder and be filled with
Argon gas is protected, and then ball milling 8 hours, rotating speed 200r/min turn 7min, stop 5min.It is added in mixed-powder before ball milling
1.5% stearic acid prevents the powder caused by ball milling temperature and energy are excessively high from generating serious soldering bonding, influences the quality of powder.
3rd, the powder after ball milling in step 2 is put into mold and carries out cold pressing treatment, cold pressing pressure 30Mpa, pressurize
30s。
4th, the powder in step 3 is put into vacuum hotpressing stove, needs first be evacuated to 10 before being heated-1Pa, so
It is heated to 200 DEG C ~ 250 DEG C manually afterwards, then is heated automatically, the accuracy of temperature when ensureing to heat automatically.
5th, 40min is kept the temperature at 600 DEG C with 10 DEG C/min at 0 ~ 600 DEG C；It is risen at 600 ~ 900 DEG C with 8 DEG C/min
Temperature；It is heated up at 900 ~ 1100 DEG C with 6 DEG C/min, 30min is kept the temperature at 1100 DEG C；1100 ~ 1250 DEG C with 5 DEG C/min into
Row heating keeps the temperature 30min at 1250 DEG C；It pressurizes 20Mpa to 1100 DEG C when temperature reaches 600 DEG C, then increasing pressure is
30Mpa until 1250 DEG C of heat preservations terminate, come out of the stove, and completes workpiece by finally cooling.
Embodiment 1
A kind of preparation of novel TiAl-base alloy material, it is Ti45Al5Nb2Cr1B to weigh becoming for TiAl-base alloy in proportion,
Gross mass is 35g；It is prepared by above-mentioned technique.
In the present embodiment
During vacuum heating-press sintering, in manual heating to after 210 DEG C, it is being converted to automatic heating.
After tested, the yield strength of novel TiAl-base alloy of the invention reaches 350MPa, and hardness reaches 65HRA.
Embodiment 2
A kind of preparation of novel TiAl-base alloy material weighs becoming as Ti45Al5Nb2Cr1B/ for TiAl-base alloy in proportion
1Y2O3, gross mass 35g；It is prepared by above-mentioned technique.
In the present embodiment
During vacuum heating-press sintering, in manual heating to after 210 DEG C, it is being converted to automatic heating.
After tested, the yield strength of novel TiAl-base alloy of the invention reaches 419MPa, and hardness reaches 74.4 HRA,
Wear resistance also has larger promotion.
Embodiment 3
A kind of preparation of novel TiAl-base alloy material weighs becoming as Ti45Al5Nb2Cr1B/ for TiAl-base alloy in proportion
1Y2O35TiC, gross mass 35g；It is prepared by above-mentioned technique.
In the present embodiment
During vacuum heating-press sintering, in manual heating to after 210 DEG C, it is being converted to automatic heating.
After tested, the yield strength of novel TiAl-base alloy of the invention reaches 614MPa, and hardness reaches 97.3 HRA,
Wear extent under one hour 40N is only 8mg.
A certain amount of Y it can be seen from upper case study on implementation2O3Addition with TiC improves the mechanical property of TiAl alloy.
In conclusion only presently preferred embodiments of the present invention, be not used for limiting the range that the present invention is implemented, it is all according to
The equivalent changes and modifications that scope of the invention as claimed the method, formula, feature and spirit are made should all be included in this hair
In bright right.
Claims (5)
1. a kind of novel TiAl-base alloy material, it is characterised in that:45%Al, 2%Cr, 8%Nb, 1% are weighed by a mole mass fraction
B, 44%Ti, then weigh 1% ~ 3% Y by mass fraction2O3, 2.5% ~ 10%TiC.
2. a kind of novel TiAl-base alloy material according to claim 1, it is characterised in that：The TiAl-base alloy powder
Average particle size be 325 mesh.
3. a kind of novel TiAl-base alloy material according to claim 1 or 2, it is characterised in that：The purity of the TiC is
99%, 50nm；Y2O3Purity be 99.99%, 50nm.
4. a kind of preparation method of novel TiAl-base alloy material according to claim 1, includes the following steps：
（1）Batch mixing：Powder is weighed in vacuum environment, is uniformly mixed, is put into ball grinder and is filled with argon gas guarantor
Shield, then ball milling 8 hours, rotating speed 200r/min turn 7min, stop 5min.
5. the stearic acid of addition 1.5% prevents the powder caused by ball milling temperature and energy are excessively high from producing in mixed-powder before ball milling
Raw serious soldering bonds, and influences the quality of powder, then places 6 hours, obtains TiAl base mixed-powders；
（2）Compacting：By step 1）In obtained mixed-powder be attached in mold, be pressed；
（3）Sintering：The raw embryo of compression moulding is put into vacuum sintering funace, at 0 ~ 600 DEG C with 10 DEG C/min, at 600 DEG C
Keep the temperature 40min；It is heated up at 600 ~ 900 DEG C with 8 DEG C/min；It is heated up at 900 ~ 1100 DEG C with 6 DEG C/min, at 1100 DEG C
Shi Baowen 30min；It is heated up at 1100 ~ 1250 DEG C with 5 DEG C/min, 30min is kept the temperature at 1250 DEG C；When temperature reaches 600 DEG C
When pressurize 20Mpa to 1100 DEG C, then increase pressure for 30Mpa until 1250 DEG C of heat preservations terminate, finally cooling come out of the stove, completion work
Part.
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| CN201711439381.3A CN108165865A (en) | 2017-12-27 | 2017-12-27 | A kind of novel TiAl-base alloy material and preparation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575659A (en) * | 2020-05-19 | 2020-08-25 | 湖南金天铝业高科技股份有限公司 | Preparation method of titanium-aluminum alloy target material |
| CN111961900A (en) * | 2020-09-07 | 2020-11-20 | 济南大学 | Novel titanium-aluminum-based composite material and preparation method thereof |
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| CN1775974A (en) * | 2005-09-29 | 2006-05-24 | 陕西科技大学 | Process for preporing auto-nano Al203/TiAl base composite material |
| CN1789463A (en) * | 2005-11-30 | 2006-06-21 | 济南大学 | Method for improving property of TiAI intermetallic compound based composite material |
| CN105112760A (en) * | 2015-09-28 | 2015-12-02 | 济南大学 | TiAl-based high-temperature self-lubricating alloy material and application thereof |
| CN106521238A (en) * | 2016-11-01 | 2017-03-22 | 太原理工大学 | Fine-grain high-strength TiAl alloy including nano Y2O3 and preparation method thereof |
| CN107130139A (en) * | 2017-06-15 | 2017-09-05 | 北京科技大学 | A kind of method of the intensified-sintered Powder Metallurgy TiAl based Alloys of addition Sn |
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2017
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775974A (en) * | 2005-09-29 | 2006-05-24 | 陕西科技大学 | Process for preporing auto-nano Al203/TiAl base composite material |
| CN1789463A (en) * | 2005-11-30 | 2006-06-21 | 济南大学 | Method for improving property of TiAI intermetallic compound based composite material |
| CN105112760A (en) * | 2015-09-28 | 2015-12-02 | 济南大学 | TiAl-based high-temperature self-lubricating alloy material and application thereof |
| CN106521238A (en) * | 2016-11-01 | 2017-03-22 | 太原理工大学 | Fine-grain high-strength TiAl alloy including nano Y2O3 and preparation method thereof |
| CN107130139A (en) * | 2017-06-15 | 2017-09-05 | 北京科技大学 | A kind of method of the intensified-sintered Powder Metallurgy TiAl based Alloys of addition Sn |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575659A (en) * | 2020-05-19 | 2020-08-25 | 湖南金天铝业高科技股份有限公司 | Preparation method of titanium-aluminum alloy target material |
| CN111961900A (en) * | 2020-09-07 | 2020-11-20 | 济南大学 | Novel titanium-aluminum-based composite material and preparation method thereof |
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