CN101701305B - TiAl intermetallic compound composite material and preparation method thereof - Google Patents
TiAl intermetallic compound composite material and preparation method thereof Download PDFInfo
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- CN101701305B CN101701305B CN2009102193120A CN200910219312A CN101701305B CN 101701305 B CN101701305 B CN 101701305B CN 2009102193120 A CN2009102193120 A CN 2009102193120A CN 200910219312 A CN200910219312 A CN 200910219312A CN 101701305 B CN101701305 B CN 101701305B
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Abstract
The invention relates to a TiAl intermetallic compound composite material and a preparation method thereof. 21.45-63.14% of Ti powder, 36.12-39.69% of Al powder and 0.74-38.87% of Cr2O3 powder in percentage by weight are utilized for hot pressed sintering process, particles reinforcement phase is automatically generated in the generation process of a matrix phase through thermit reaction, fine composite material of TiAl that an Al2O3 dispersed phase toughens a matrix phase, and microalloying improvement is carried out on the matrix phase by the generated Cr in the reaction; as the composite material has highly adjustable components, low firing temperature, even and compact structure, lower cost and excellent mechanical property, the application range is widened; in addition, the method reduces the firing temperature and hot pressing pressure, and realizes micritization of crystalline grains in rapid firing.
Description
Technical field
The present invention relates to field of compound material, particularly a kind of TiAl intermetallic compound composite material and preparation method thereof.
Background technology
The TiAl intermetallic compound has excellent high-temperature behavior, combine the advantage of pottery and metal material, and has a littler bulk density, under hot conditions, can have metal and ceramic material now by Substitute For Partial, enhancing product performance and to realize lightweight, thereby become one of exploitation focus of high-temperature structural material.But the brittleness at room temperature of TiAl own is big, be difficult to deformation processing, non-oxidizability deficiency more than 850 ℃, serious obstruction the practical application of this material.
Introduce Cr in the TiAl alloy and can significantly improve hot workability and the superplasticity and the high-temperature oxidation resistance of this material, but still can not fundamentally solve the relatively poor shortcoming of its mechanical property.Utilize the TiAl/Al of dispersion consolidatedization of ceramic phase
2O
3Composite not only has cheap for manufacturing cost, and Al
2O
3Thermal coefficient of expansion and TiAl matrix are also the most approaching, thereby the performance of this material is greatly improved.Prior preparation method has that direct metal oxidation method, reaction are moltenly oozed method, air pressure is molten oozes method and hot isostatic pressing method etc., but such technology is difficult to make disperse phase to be uniformly distributed among the body material, thereby has significantly reduced the performance of material.
Summary of the invention
In order to overcome the defective of above-mentioned prior art, the object of the present invention is to provide a kind of TiAl intermetallic compound composite material and preparation method thereof, have evenly tiny Al preparing
2O
3In the time of disperse phase, utilize generated in-situ Cr that matrix phase TiAl is further optimized TiAl/Al
2O
3Composite has reduced firing temperature and hot pressing pressure simultaneously, has realized the crystal grain controlled micro crystallization in burning till fast.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of TiAl intermetallic compound composite material, its raw material constituent is: the Ti powder accounts for the 21.45-63.14% of gross weight, and the Al powder accounts for the 36.12-39.69% of gross weight, Cr
2O
3Powder accounts for the 0.74-38.87% of gross weight.
Above feed composition designs by following reaction equation:
xTi+(x+3)Al+Cr
2O
3→xTiAl+Al
2O
3+Cr
2Al (1)
Just can synthesize different al by changing the x value
2O
3The TiAl composite of content, x=269.22-1.75.If x is greater than 269.22, Al in the composite that then generates
2O
3Growing amount less than product quality 0.5% and do not have the effect of enhancing, toughness reinforcing TiAl matrix, otherwise, if the x value less than 1.75, Cr in the product then
2The Al phasor surpasses the content of TiAl matrix phase, can not be referred to as the TiAl based composites, simultaneously, and Al
2O
3Growing amount will be above 28%, excessive Al
2O
3Not only do not have the effect that improves the TiAl intermetallic compound, can worsen its performance on the contrary.Therefore determined above compositional range.
A kind of preparation technology of TiAl intermetallic compound composite material, its step is as follows:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder and Cr
2O
3Powder is by weight mixing for the ratio of 21.45-63.14%:36.12-39.69%:0.74-38.87%;
(2) dehydrated alcohol that the mixture in the step (1) is added in the high alumina ball grinder and add mixture quality 45-100% is a medium with 700-800 rev/min rotating speed mix grinding 30-60 minute, and crosses 200 mesh sieves;
(3) step (2) gained powder is packed in the graphite grinding tool, hot pressed sintering, under argon gas or vacuum condition, sintering range is: 1100-1300 ℃, be incubated 1-2 hour, hot pressing pressure is 5-15Mpa;
(4) step (3) gained material is naturally cooled to room temperature and can obtain the TiAl intermetallic compound composite material that will prepare.
Prepared TiAl intermetallic compound composite material, it is characterized in that, it is made up of matrix phase and wild phase two parts, matrix phase accounts for the 99.5-72% of composite gross weight, wild phase accounts for the 0.5-28% of gross weight, and matrix phase is by the TiAl phase that accounts for product gross weight 36.03-98.86% and the Cr of 0.64-35.97%
2Al forms, and all the other are wild phase Al
2O
3
The present invention utilizes Ti powder, Al powder and Cr
2O
3Powder by thermit reaction spontaneous particulates reinforcements in the process that matrix phase generates, has prepared Al through hot-pressing sintering technique
2O
3The thin crystal composite material of disperse phase Strengthening and Toughening matrix phase TiAl, and the Cr that utilizes reaction to generate carries out the microalloying improvement to matrix phase.Because this material composition adjustability is big, firing temperature is low, the even structure densification, and cost is lower, and the mechanical property excellence has been widened the range of application of this composite.In addition, this method has reduced firing temperature and hot pressing pressure, has realized the crystal grain micritization in burning till fast.
Description of drawings
Fig. 1 is the material phase analysis result of embodiment one, and X-coordinate is a diffraction angle, and ordinate zou is a diffraction peak intensity.
Fig. 2 is the cross-section morphology figure of embodiment one.
Embodiment
Embodiment one
The raw material constituent of present embodiment is: the Ti powder accounts for 59.10% of gross weight, and the Al powder accounts for 36.46% of gross weight, Cr
2O
3Powder accounts for 4.44% of gross weight.
The step of preparation process of present embodiment is as follows:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder and Cr
2O
3Powder is that 59.10%, 36.46%, 4.44% ratio mixes by weight;
(2) dehydrated alcohol that the mixture in the step (1) is added in the high alumina ball grinder and add mixture quality 50% is a medium with 700 rev/mins rotating speed mix grinding 60 minutes, and crosses 200 mesh sieves;
(3) step (2) gained powder is packed in the graphite grinding tool, hot pressed sintering, under vacuum condition, sintering temperature is 1100 ℃, is incubated 2 hours, hot pressing pressure is 5Mpa;
(4) step (3) gained material is naturally cooled to room temperature and can obtain the TiAl intermetallic compound composite material that will prepare.
The TiAl intermetallic compound composite material that present embodiment is prepared, it is characterized in that it is made up of matrix phase and wild phase two parts, matrix phase accounts for 97% of composite gross weight, wild phase accounts for 3% of gross weight, and matrix phase is by the TiAl phase that accounts for product gross weight 93.15% and 3.85% Cr
2Al forms, and all the other are 3% wild phase Al
2O
3
With reference to Fig. 1, show that this material matrix is by TiAl principal crystalline phase and a small amount of Ti
3Al and Cr
2Al forms, and wild phase is Al
2O
3Phase.
With reference to Fig. 2, as can be seen, this material grains is tiny, compact structure, pore-free.
Embodiment two
The raw material constituent of present embodiment is: the Ti powder accounts for 48.07% of gross weight, and the Al powder accounts for 37.41% of gross weight, Cr
2O
3Powder accounts for 14.52% of gross weight.
The step of preparation process of present embodiment is as follows:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder and Cr
2O
3Powder is that 48.07%, 37.41%, 14.52% ratio mixes by weight;
(2) dehydrated alcohol that the mixture in the step (1) is added in the high alumina ball grinder and add mixture quality 75% is a medium with 750 rev/mins rotating speed mix grinding 45 minutes, and crosses 200 mesh sieves;
(3) step (2) gained powder is packed in the graphite grinding tool, hot pressed sintering, under vacuum condition, firing temperature is 1200 ℃, is incubated 1.5 hours, hot pressing pressure is 7.5Mpa;
(4) step (3) gained material is naturally cooled to room temperature and can obtain the TiAl intermetallic compound composite material that will prepare.
The TiAl intermetallic compound composite material that present embodiment is prepared, it is characterized in that it is made up of matrix phase and wild phase two parts, matrix phase accounts for 90% of composite gross weight, wild phase accounts for 10% of gross weight, and matrix phase is by the TiAl phase that accounts for product gross weight 77.15% and 12.85% Cr
2Al forms, and all the other are 10% wild phase Al
2O
3This matrix material flexural strength is 660MPa, and fracture toughness property reaches 6.8MPam
1/2
Embodiment three
The raw material constituent of present embodiment is: the Ti powder accounts for 40.43% of gross weight, and the Al powder accounts for 38.06% of gross weight, Cr
2O
3Powder accounts for 21.51% of gross weight.
The step of preparation process of present embodiment is as follows:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder and Cr
2O
3Powder is that 40.43%, 38.06%, 21.51% ratio mixes by weight;
(2) dehydrated alcohol that the mixture in the step (1) is added in the high alumina ball grinder and add mixture quality 100% is a medium with 800 rev/mins rotating speed mix grinding 30 minutes, and crosses 200 mesh sieves;
(3) step (2) gained powder is packed in the graphite grinding tool, hot pressed sintering, under the argon gas condition, firing temperature is 1300 ℃, is incubated 1 hour, hot pressing pressure is 5Mpa;
(4) step (3) gained material is naturally cooled to room temperature and can obtain the TiAl intermetallic compound composite material that will prepare.
The TiAl intermetallic compound composite material that present embodiment is prepared, it is characterized in that it is made up of matrix phase and wild phase two parts, matrix phase accounts for 85% of composite gross weight, wild phase accounts for 15% of gross weight, and matrix phase is by the TiAl phase that accounts for product gross weight 65.73% and 19.27% Cr
2Al forms, and all the other are 15% wild phase Al
2O
3The hardness of this matrix material (HRA) reaches 80, and oxidation-resistance has had obvious improvement.
Claims (9)
1. a TiAl intermetallic compound composite material is characterized in that, the raw material constituent is: the Ti powder accounts for the 21.45-63.14% of gross weight, and the Al powder accounts for the 36.12-39.69% of gross weight, Cr
2O
3Powder accounts for the 0.74-38.87% of gross weight.
2. a kind of TiAl intermetallic compound composite material according to claim 1, it is characterized in that the raw material constituent is: the Ti powder accounts for 59.10% of gross weight, and the Al powder accounts for 36.46% of gross weight, Cr
2O
3Powder accounts for 4.44% of gross weight.
3. a kind of TiAl intermetallic compound composite material according to claim 1, it is characterized in that the raw material constituent is: the Ti powder accounts for 48.07% of gross weight, and the Al powder accounts for 37.41% of gross weight, Cr
2O
3Powder accounts for 14.52% of gross weight.
4. the preparation technology of a TiAl intermetallic compound composite material is characterized in that, step is as follows: (1) greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder and Cr with purity
2O
3Powder is by weight mixing for the ratio of 21.45-63.14%:36.12-39.69%:0.74-38.87%; (2) absolute ethyl alcohol that the mixture in the step (1) is added in the high aluminium ball grinding jar and add mixture quality 45-100% is medium with 700-800 rev/min rotating speed mix grinding 30-60 minute, and crosses 200 mesh sieves; (3) step (2) gained powder is packed in the graphite grinding tool, hot pressed sintering, under argon gas or vacuum condition, sintering range is: 1100-1300 ℃, be incubated 1-2 hour, hot pressing pressure is 5-15MPa; (4) step (3) resulting materials is naturally cooled to room temperature and can obtain TiAl intermetallic compound composite material to be prepared.
5. the preparation technology of a kind of TiAl intermetallic compound composite material according to claim 4 is characterized in that, step is as follows: (1) greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder and Cr with purity
2O
3Powder is that 59.10%, 36.46%, 4.44% ratio mixes by weight; (2) absolute ethyl alcohol that the mixture in the step (1) is added in the high aluminium ball grinding jar and add mixture quality 50% is medium with 700 rev/mins rotating speed mix grinding 60 minutes, and crosses 200 mesh sieves; (3) step (2) gained powder is packed in the graphite grinding tool, hot pressed sintering, under vacuum condition, sintering temperature is 1100 ℃, is incubated 2 hours, hot pressing pressure is 5MPa; (4) step (3) resulting materials is naturally cooled to room temperature and can obtain TiAl intermetallic compound composite material to be prepared.
6. the preparation technology of a kind of TiAl intermetallic compound composite material according to claim 4 is characterized in that, step is as follows: (1) greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder and Cr with purity
2O
3Powder is that 48.07%, 37.41%, 14.52% ratio mixes by weight; (2) absolute ethyl alcohol that the mixture in the step (1) is added in the high aluminium ball grinding jar and add mixture quality 75% is medium with 750 rev/mins rotating speed mix grinding 45 minutes, and crosses 200 mesh sieves; (3) step (2) gained powder is packed in the graphite grinding tool, hot pressed sintering, under vacuum condition, sintering temperature is 1200 ℃, is incubated 1.5 hours, hot pressing pressure is 7.5MPa; (4) step (3) resulting materials is naturally cooled to room temperature and can obtain TiAl intermetallic compound composite material to be prepared.
7. a TiAl intermetallic compound composite material is characterized in that, it is made up of matrix phase and wild phase two parts, and matrix phase accounts for the 99.5-72% of composite gross weight, and wild phase accounts for the 0.5-28% of composite gross weight, and wild phase is Al
2O
3, matrix phase is by the TiAl phase of composite gross weight 36.03-98.86% and the Cr of 0.64-35.97%
2Al forms.
8. a kind of TiAl intermetallic compound composite material according to claim 7 is characterized in that, it is made up of matrix phase and wild phase two parts, and matrix phase accounts for 97% of composite gross weight, and wild phase accounts for 3% of composite gross weight, and wild phase is Al
2O
3, matrix phase is by the TiAl phase that accounts for composite gross weight 93.15% and 3.85% Cr
2Al forms.
9. a kind of TiAl intermetallic compound composite material according to claim 7 is characterized in that, it is made up of matrix phase and wild phase two parts, and matrix phase accounts for 90% of composite gross weight, and wild phase accounts for 10% of composite gross weight, and wild phase is Al
2O
3, matrix phase is by the TiAl phase that accounts for composite gross weight 77.15% and 12.85% Cr
2Al forms.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102193120A CN101701305B (en) | 2009-12-03 | 2009-12-03 | TiAl intermetallic compound composite material and preparation method thereof |
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|---|---|---|---|
| CN2009102193120A CN101701305B (en) | 2009-12-03 | 2009-12-03 | TiAl intermetallic compound composite material and preparation method thereof |
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| CN101701305B true CN101701305B (en) | 2011-06-08 |
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| CN102181766B (en) * | 2010-12-31 | 2013-03-20 | 陕西科技大学 | A (Ti, cr)2AlC solid solution composite material and its prepn |
| CN102181765B (en) * | 2010-12-31 | 2013-03-20 | 陕西科技大学 | A (Ti, cr)3AlC2/Al2O3composite material and its preparation method |
| CN102433525B (en) * | 2011-12-14 | 2013-06-05 | 中国航空工业集团公司北京航空材料研究院 | Method for improving microstructure of casted Ti3Al alloy by hydrogenation-hot isostatic pressing |
| CN103122426B (en) * | 2013-03-08 | 2014-07-30 | 山东金山汽配有限公司 | Titanium-based powder metallurgy brake disc material and preparation method thereof |
| CN103962548A (en) * | 2014-05-12 | 2014-08-06 | 西安热工研究院有限公司 | Coating material with abrasion-resistant and cavitation-damage-prevention functions and preparation method thereof |
| CN105422939A (en) * | 2015-12-14 | 2016-03-23 | 无锡福镁轻合金科技有限公司 | Composite material for balance valve |
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