CN102268570B - Al2O3/TiAl intermetallic compound composite material - Google Patents
Al2O3/TiAl intermetallic compound composite material Download PDFInfo
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- CN102268570B CN102268570B CN2011102259727A CN201110225972A CN102268570B CN 102268570 B CN102268570 B CN 102268570B CN 2011102259727 A CN2011102259727 A CN 2011102259727A CN 201110225972 A CN201110225972 A CN 201110225972A CN 102268570 B CN102268570 B CN 102268570B
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Abstract
The invention discloses a Al2O3/TiAl intermetallic compound composite material. Ti powder, Al powder, Nb2O5 powder and Cr2O3 powder are subjected to a hot pressed sintering process, a particle reinforced phase and microalloyed elements are automatically generated through aluminothermic reduction reaction in the process of generating a matrix phase, and a Cr and Nb microalloyed Al2O3/TiAl fine crystal composite material is prepared. The obtained material integrates advantages of composites materials; the matrix phase is subjected to bi-component microalloying, so that the comprehensive mechanical properties of the material are further improved; moreover, the firing temperature and hot pressing pressure are reduced, grain refining is realized in quick firing, and the production cost is reduced.
Description
Technical field
The present invention relates to field of compound material, particularly a kind of Al
2O
3/ TiAl intermetallic compound composite material.
Background technology
The TiAl intermetallic compound is owing to have a low density, the high-performance of aspects such as high elastic coefficient and high temperature specific tenacity and be considered to have most the high-temperature structural material of new generation of application potential.Be expected under hot conditions to substitute existing metal of part and stupalith, enhancing product performance and to realize lightweight, thereby become one of exploitation focus of high-temperature structural material.But the subject matter that TiAl base alloy faces is how to improve its comprehensive mechanical property and high-temperature oxidation resistance to improve the practical application of this material through control chemical ingredients and microstructure.
At present, high niobium Ti Al alloy becomes main research tendency, in addition, in the TiAl alloy, introduces hot workability and superplasticity and the high-temperature oxidation resistance that Cr can significantly improve this material.However, still can not fundamentally solve the relatively poor shortcoming of TiAl base alloy mechanical property.Utilize the Al of dispersion consolidatedization of ceramic phase
2O
3/ TiAl matrix material not only has cheap for manufacturing cost, and Al
2O
3Thermal expansivity and TiAl matrix are also approaching, thereby the performance of this material is greatly improved.Prior preparation method has direct metal oxidation method, reaction to dissolve the method for oozing, air pressure dissolves and 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 Al
2O
3/ TiAl compound composite material, utilize generated in-situ Cr and Nb element to matrix mutually TiAl further optimize Al
2O
3/ TiAl matrix material combines the multielement micro-alloying technology to improve the over-all properties of TiAl sill with the Ceramic Composite technology.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of Al
2O
3/ TiAl intermetallic compound composite material is characterized in that, it is Ti powder 45.89-76.64%, Al powder 22.42-32.22%, Cr that raw material is formed weight percent
2O
3Powder 0.15-3.51% and Nb
2O
5Powder 0.79-18.39%.
Above feed composition designs by following reaction equation:
2xTi+(x+31)Al+Cr
2O
3+3Nb
2O
5→2xTiAl+6Al
2O
3+Cr
2Al+6NbAl
3 (1)
Just can synthesize different al through changing the x value
2O
3The TiAl matrix material of content, x=810.54-20.78.If x is greater than 810.54, Al in the matrix material 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 20.78, Al in the product then
2O
3Growing amount will be above 15%, excessive Al
2O
3Not only do not have the effect that improves the TiAl intermetallic compound, can worsen its performance on the contrary.Therefore confirmed above compositional range.
Step of preparation process of the present invention is:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder, Cr
2O
3Powder and Nb
2O
5Powder, Ti powder 45.89-76.64%, Al powder 22.42-32.22%, Cr by weight percentage
2O
3Powder 0.15-3.51% and Nb
2O
5Powder 0.79-18.39% is mixed and made into mixture;
(2) absolute ethyl alcohol that adds step (1) gained mixture in the high alumina ball grinder and add mixture quality 50-100% is a medium, with 700-800 rev/min rotating speed mix grinding 30-60 minute, and crosses 200 mesh sieves;
(3) step (2) the gained powder that sieves is packed in the graphite grinding tool, hot pressed sintering under argon gas or vacuum condition, firing range is: 1100-1300 ℃, hot pressing pressure is 5-15MPa;
(4) with step (3) gained material insulation 0.5-2.0 hour, naturally cool to again room temperature can obtain the Al that will prepare
2O
3/ TiAl intermetallic compound composite material.
The Al that the present invention is prepared
2O
3/ TiAl compound composite material, its component is: it is made up of matrix phase and wild phase two portions, and wild phase accounts for the 0.5-15% of gross weight, and matrix accounts for the 99.5-85% of gross weight mutually, and wild phase is generated in-situ tiny Al
2O
3Phase, matrix are mutually mainly by product total mass 99.21-76.31%TiAl phase, 0.11-3.21%NbAl
3And 0.18-5.48%Cr
2Al forms.
The present invention utilizes Ti powder, Al powder, Nb
2O
5Powder and Cr
2O
3Powder is through hot-pressing sintering technique, is reflected at spontaneous particle wild phase and micro alloying element in the process that matrix generates mutually through thermite reduction, prepared Cr, Nb microalloying Al
2O
3The thin crystal composite material of/TiAl.Because this material combines outside the advantage of matrix material, also matrix has been carried out two component microalloyings mutually, makes this comprehensive mechanical performance obtain further raising.In addition, this method has reduced firing temperature and hot pressing pressure, in burning till fast, has realized grain refining, has reduced production cost simultaneously.
Description of drawings
Fig. 1 is the material phase analysis figure of embodiment one.
Fig. 2 is the cross-section morphology figure of embodiment one sample.
Embodiment
Embodiment one
Present embodiment the Al that will prepare
2O
3/ TiAl compound composite material is characterized in that, raw material form weight percent for the Ti powder account for gross weight 51.07%, the Al powder accounts for 30.57%, Cr
2O
3Powder accounts for 2.94% and Nb
2O
5Powder accounts for 15.42%.
The step of preparation process of present embodiment is:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder, Nb
2O
5Powder and Cr
2O
3Powder, by the Ti powder account for gross weight 51.07%, the Al powder accounts for 30.57%, Cr
2O
3Powder accounts for 2.94% and Nb
2O
5Powder accounts for 15.42% ratio and processes mixture;
(2) absolute ethyl alcohol that adds step (1) gained mixture in the high alumina ball grinder and add mixture quality 50% is a medium, with 700 rev/mins rotating speed mix grindings 60 minutes, and crosses 200 mesh sieves;
(3) step (2) the gained powder that sieves is packed in the graphite grinding tool, hot pressed sintering under vacuum condition, firing temperature are 1300 ℃, and hot pressing pressure is 10MPa;
(4) with step (3) gained material insulation 1 hour, naturally cool to again room temperature can obtain the Al that will prepare
2O
3/ TiAl compound composite material.
The Al that present embodiment is prepared
2O
3/ TiAl compound composite material, its component is: it is made up of matrix phase and wild phase two portions, and wild phase accounts for 12% of gross weight, and matrix accounts for 88% of gross weight mutually, and wild phase is generated in-situ tiny Al
2O
3Phase, matrix are mutually mainly by accounting for product total mass 81.05%TiAl phase, 4.38%NbAl
3And 2.57%Cr
2Al forms.
With reference to Fig. 1, X-coordinate is diffraction angle (unit is degree), and ordinate zou is a diffraction peak intensity, can find out that prepared matrices of composite material is by TiAl principal crystalline phase and minor N bAl
3Form, wild phase is Al
2O
3Phase.
With reference to Fig. 2, can find out that prepared compound crystal grain is tiny, compact structure, pore-free.
Embodiment two
Present embodiment the Al that will prepare
2O
3/ TiAl compound composite material is characterized in that, raw material form weight percent for the Ti powder account for gross weight 75.29%, Al powder 22.85%, Cr
2O
3Powder 0.3% and Nb
2O
5Powder 1.56%.
Step of preparation process of the present invention is:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder, Nb
2O
5Powder and Cr
2O
3Powder, by the Ti powder account for gross weight 75.29%, Al powder 22.85%, Cr
2O
3Powder 0.3% and Nb
2O
5The ratio of powder 1.56% is processed mixture;
(2) absolute ethyl alcohol that adds step (1) gained mixture 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) the gained powder that sieves is packed in the graphite grinding tool, hot pressed sintering under vacuum condition, firing temperature are 1100 ℃, and hot pressing pressure is 5MPa;
(4) with step (3) gained material insulation 1 hour, naturally cool to again room temperature can obtain the Al that will prepare
2O
3/ TiAl compound composite material.
The Al that present embodiment is prepared
2O
3/ TiAl compound composite material, its component is: it is made up of matrix phase and wild phase two portions, and wild phase accounts for 1% of gross weight, and matrix accounts for 99% of gross weight mutually, and wild phase is generated in-situ tiny Al
2O
3Phase, matrix are mutually mainly by accounting for product total mass 98.42%TiAl phase, 0.37%NbAl
3And 0.21%Cr
2Al forms.The bending strength of this material is 410MPa; Fracture toughness property is 7.2MPam
1/2
Embodiment three
Present embodiment the Al that will prepare
2O
3/ TiAl compound composite material is characterized in that, raw material is formed weight percent for the Ti powder accounts for 65.37%, the Al powder accounts for 26.01%, Cr
2O
3Powder accounts for 1.38% and Nb
2O
5Powder accounts for 7.24%.
The step of preparation process of present embodiment is:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder, Nb
2O
5Powder and Cr
2O
3Powder, by the Ti powder account for gross weight 65.37%, the Al powder accounts for 26.01%, Cr
2O
3Powder accounts for 1.38% and Nb
2O
5Powder accounts for 7.24% ratio and processes mixture;
(2) absolute ethyl alcohol that adds step (1) gained mixture in the high alumina ball grinder and add mixture quality 80% is a medium, with 700 rev/mins rotating speed mix grindings 50 minutes, and crosses 200 mesh sieves;
(3) step (2) the gained powder that sieves is packed in the graphite grinding tool, hot pressed sintering under the argon gas condition, firing temperature are 1150 ℃, and hot pressing pressure is 8MPa;
(4) with step (3) gained material insulation 1 hour, naturally cool to again room temperature can obtain the Al that will prepare
2O
3/ TiAl compound composite material.
The Al that present embodiment is prepared
2O
3/ TiAl compound composite material, its component is: it is made up of matrix phase and wild phase two portions, and wild phase accounts for 5% of gross weight, and matrix accounts for 95% of gross weight mutually, and wild phase is generated in-situ tiny Al
2O
3Phase, matrix are mutually mainly by accounting for product total mass 92.1%TiAl phase, 1.83%NbAl
3And 1.07%Cr
2Al forms.The bending strength of this material is 520MPa; Fracture toughness property is 8.1MPam
1/2
Embodiment four
Present embodiment the Al that will prepare
2O
3/ TiAl compound composite material is characterized in that, raw material form weight percent for the Ti powder account for gross weight 54.82%, the Al powder accounts for 29.37%, Cr
2O
3Powder accounts for 2.53% and Nb
2O
5Powder accounts for 13.28%.
The step of preparation process of present embodiment is:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder, Nb
2O
5Powder and Cr
2O
3Powder, by the Ti powder account for gross weight 54.82%, the Al powder accounts for 29.37%, Cr
2O
3Powder accounts for 2.53% and Nb
2O
5Powder accounts for 13.28% ratio and processes mixture;
(2) absolute ethyl alcohol that adds step (1) gained mixture in the high alumina ball grinder and add mixture quality 70% is a medium, with 750 rev/mins rotating speed mix grindings 40 minutes, and crosses 200 mesh sieves;
(3) step (2) the gained powder that sieves is packed in the graphite grinding tool, hot pressed sintering under vacuum condition, firing temperature are 1200 ℃, and hot pressing pressure is 10MPa;
(4) with step (3) gained material insulation 1 hour, naturally cool to again room temperature can obtain the Al that will prepare
2O
3/ TiAl compound composite material.
The Al that present embodiment is prepared
2O
3/ TiAl compound composite material, its component is: it is made up of matrix phase and wild phase two portions, and wild phase accounts for 10% of gross weight, and matrix accounts for 90% of gross weight mutually, and wild phase is generated in-situ tiny Al
2O
3Phase, matrix are mutually mainly by accounting for product total mass 84.21%TiAl phase, 3.65%NbAl
3And 2.14%Cr
2Al forms.The bending strength of this material is 630MPa; Fracture toughness property is 9.3MPam
1/2
Embodiment five
Present embodiment the Al that will prepare
2O
3/ TiAl compound composite material is characterized in that, raw material form weight percent for the Ti powder account for gross weight 45.88%, the Al powder accounts for 32.22%, Cr
2O
3Powder accounts for 3.51% and Nb
2O
5Powder accounts for 18.39%.
The step of preparation process of present embodiment is:
(1) with purity greater than 99%, fineness is less than 200 purpose metal Ti powder, Al powder, Nb
2O
5Powder and Cr
2O
3Powder, by the Ti powder account for gross weight 45.88%, the Al powder accounts for 32.22%, Cr
2O
3Powder accounts for 3.51% and Nb
2O
5Powder accounts for 18.39% ratio and processes mixture;
(2) absolute ethyl alcohol that adds step (1) gained mixture in the high alumina ball grinder and add mixture quality 50% is a medium, with 800 rev/mins rotating speed mix grindings 30 minutes, and crosses 200 mesh sieves;
(3) step (2) the gained powder that sieves is packed in the graphite grinding tool, hot pressed sintering under the argon gas condition, firing temperature are 1300 ℃, and hot pressing pressure is 12MPa;
(4) with step (3) gained material insulation 1 hour, naturally cool to again room temperature can obtain the Al that will prepare
2O
3/ TiAl compound composite material.
The Al that present embodiment is prepared
2O
3/ TiAl compound composite material, its component is: it is made up of matrix phase and wild phase two portions, and wild phase accounts for 15% of gross weight, and matrix accounts for 85% of gross weight mutually, and wild phase is generated in-situ tiny Al
2O
3Phase, matrix are mutually mainly by accounting for product total mass 76.31%TiAl phase and 5.48%NbAl
3With 3.21%Cr
2Al forms.The bending strength of this material is 525MPa; Fracture toughness property is 8.5MPam
1/2
Claims (1)
1. Al
2O
3/ TiAl intermetallic compound composite material is characterized in that, it is made up of matrix phase and wild phase two portions, and wild phase accounts for the 0.5-15% of gross weight, and matrix accounts for the 85-99.5% of gross weight mutually, and wild phase is generated in-situ tiny Al
2O
3Phase, matrix are mutually mainly by accounting for gross weight 76.31-99.21%TiAl phase, 0.11-3.21%NbAl
3And 0.18-5.48%Cr
2Al forms.
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|---|---|---|---|
| CN2011102259727A CN102268570B (en) | 2009-12-03 | 2009-12-03 | Al2O3/TiAl intermetallic compound composite material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102259727A CN102268570B (en) | 2009-12-03 | 2009-12-03 | Al2O3/TiAl intermetallic compound composite material |
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|---|---|---|---|
| CN2009102193154A Division CN101768686B (en) | 2009-12-03 | 2009-12-03 | Al2O3/TiAl intermetallic compound composite material and preparation method thereof |
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| CN105274380A (en) * | 2014-07-07 | 2016-01-27 | 陈焕铭 | Method for improving wettability of Al2O3 porous perform and NbAl molten alloy |
| CN104388733B (en) * | 2014-10-13 | 2017-02-15 | 北京科技大学 | Preparation method of TiAl/alpha-Al2O3 nano-composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1804068A (en) * | 2006-01-18 | 2006-07-19 | 陕西科技大学 | Preparation method of highly dispersed AI2O3 particle reinforced Ti-Al based composite material |
| CN101100710A (en) * | 2007-07-31 | 2008-01-09 | 陕西科技大学 | Method for preparing high-niobium TiAl intermetallic compound composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1804068A (en) * | 2006-01-18 | 2006-07-19 | 陕西科技大学 | Preparation method of highly dispersed AI2O3 particle reinforced Ti-Al based composite material |
| CN101100710A (en) * | 2007-07-31 | 2008-01-09 | 陕西科技大学 | Method for preparing high-niobium TiAl intermetallic compound composite material |
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| Title |
|---|
| JP特开平11-131216A 1999.05.18 |
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Effective date of registration: 20170516 Address after: Xianyang, Shaanxi Province, people's West Road, Shaanxi Province, North District, Shaanxi Province Patentee after: Shaanxi Xinhui New Energy Technology Development Co., Ltd. Address before: 710021 Shaanxi province Xi'an Weiyang university campus of Shaanxi University of Science and Technology Patentee before: Shaanxi University of Science and Technology |
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