CN103469135B - Preparation method of high-niobium TiAl intermetallic compound - Google Patents
Preparation method of high-niobium TiAl intermetallic compound Download PDFInfo
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- CN103469135B CN103469135B CN201310414717.6A CN201310414717A CN103469135B CN 103469135 B CN103469135 B CN 103469135B CN 201310414717 A CN201310414717 A CN 201310414717A CN 103469135 B CN103469135 B CN 103469135B
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Abstract
The invention relates to a preparation method of high-niobium TiAl intermetallic compound. The prepared high-niobium TiAl intermetallic compound can substitute nickel-base superalloy and other materials to be used for manufacturing heat-resisting structure components of advance aircrafts in the aviation and aerospace field, can achieve about 50% lightweight effect, and belongs to the technical field of aviation and aerospace heat-resisting materials. According to the prepared high-niobium TiAl intermetallic compound, the mechanical property sigma b is more than or equal to 800MPa, delta5 is more than or equal to 1.0%; at 1100DEG C, the mechanical property sigma b is more than or equal to 70MPa and delta5 is more than or equal to 8.0%; the internal quality of the high-niobium TiAl intermetallic compound prepared by the technique can reach the A-grade level of GJB1580A; the density of the high-niobium TiAl intermetallic compound prepared by the technique is higher than the theoretical density by 99%.
Description
Technical field
The present invention relates to a kind of preparation method of high-niobium TiAl intermetallic compound, the materials such as the alternative nickel base superalloy of high-niobium TiAl intermetallic compound of preparation are for the manufacture of the heat resistant structure parts of the advanced aircraft of aerospace field, the lighting effect of about 50% can be obtained, belong to aerospace heat-stable material technical field.
Background technology
The density of high-niobium TiAl intermetallic compound is at 4.0g/cm
3left and right, has superior high-temperature behavior at about 900 ~ 1000 DEG C, can become the equivalent material of nickel base superalloy or steel alloy in this temperature range, thus makes the quality of these parts reduce about 50%.Both at home and abroad high-niobium TiAl intermetallic compound is carried out and studied widely, but mostly concentrated on the aspects such as the alloying of high-niobium TiAl intermetallic compound, melting, casting and forging.Because the alloying level of high-niobium TiAl intermetallic compound is higher, easily there is composition and microtexture segregation, and then bring the reduction of use properties reliability, hinder its through engineering approaches at aerospace field to apply.
Powder metallurgical technique has been widely used improving tool in material property.By the research in high-niobium TiAl intermetallic compound powder pre-treating technology, high-niobium TiAl intermetallic compound powder under vacuum encapsulation technology and high-niobium TiAl intermetallic compound microtexture control techniques etc. in prior art, prepare the high-niobium TiAl intermetallic compound material of homogeneous microstructure, material densification.
Summary of the invention
The object of the invention is the preparation method in order to propose a kind of high-niobium TiAl intermetallic compound, the method can make high-niobium TiAl intermetallic compound have tiny, uniform microtexture, and possesses good comprehensive mechanical property.
The object of the invention is to be achieved through the following technical solutions.
The preparation method of a kind of high-niobium TiAl intermetallic compound of the present invention, in this compound, the molar content of niobium element is not less than 5%; With high-niobium TiAl intermetallic compound pre-alloyed powder for starting material, concrete steps are:
1) by the granularity of ball milling refinement powder, the activity of powder surface is improved;
2) powder is loaded in soft steel jacket, and at a certain temperature jacket is vacuumized;
3) hot isostatic pressing densification is carried out to the jacket after vacuumizing;
4) soft steel jacket is removed;
5) the high-niobium TiAl intermetallic compound blank of acquisition is put into silica glass jacket, carry out fixation rates, the high-niobium TiAl intermetallic compound material with comprehensive mechanical property can be obtained.
Beneficial effect
The mechanical property σ b ≮ 800MPa of the high-niobium TiAl intermetallic compound (with Ti-45Al-8.5Nb-(W, B, Y) for example) of preparation of the present invention, δ 5 ≮ 1.0%, at 1100 DEG C, its mechanical property: σ b ≮ 70MPa, δ 5 ≮ 8.0%; The internal soundness of the high-niobium TiAl intermetallic compound prepared by this technique reaches the A level level of GJB1580A; The density of the high-niobium TiAl intermetallic compound prepared by this technique exceedes 99% of theoretical density.
Accompanying drawing explanation
Fig. 1 is the structure figure of TiAl series intermetallic compound.
Embodiment
The present invention is further illustrated below.
Embodiment 1
A kind of high-performance powder metallurgy high-niobium TiAl intermetallic compound Ti-45Al-8.5Nb-0.2W-0.3B-0.02Y(at%) manufacture method of (below referred to as Ti-45Al-8.5Nb-(W, B, Y)), comprise the following steps:
(1) loaded in titanium alloy ball grinder together with diamond ball-milling ball by Ti-45Al-8.5Nb-(W, B, Y) pre-alloyed powder, and be filled with the mixed gas of argon gas and hydrogen, ratio is at 8:1(volume ratio), at room temperature Ball-milling Time 60h.
(2) Ti-45Al-8.5Nb-(W, B, the Y) powder after ball milling is loaded in soft steel jacket under the condition of vibration, and weld gas removing pipe, gas removing pipe is connected on vacuum pump set and vacuumizes.The technique vacuumized is: at room temperature degasification time 2h, treats that in jacket, vacuum tightness is better than 3 × 10
-3after Pa, jacket is warming up to 260 DEG C, insulation 3h, treats that in jacket, vacuum tightness is better than 4 × 10
-3after Pa, jacket is warming up to 680 DEG C, soaking time 12h, treats that in jacket, vacuum tightness is better than 1 × 10
-3after Pa, artificial forging envelope gas removing pipe, closes gas removing pipe with argon welder after cutting off gas removing pipe.
(3) jacket is put into hot isostatic press and carry out hot isostatic pressing densification, heat and other static pressuring processes is: 1280 ± 15 DEG C, 4h, and pressure is 150MPa.Powder metallurgy Ti-45Al-8.5Nb-(W, B, Y) material pressed compact can be obtained after hot isostatic pressing.
(4) remove the soft steel jacket of Ti-45Al-8.5Nb-(W, B, Y) pressed compact outside by the method for Vehicle Processing, obtain high-niobium TiAl intermetallic compound blank.
(5) loaded in silica glass jacket by Ti-45Al-8.5Nb-(W, B, Y) blank, and be filled with argon gas, pressure is 5MPa, then glass bag is put into process furnace and heat-treats.Heat treating regime is: the first step, is warming up to 1420 DEG C, and soaking time is 60min, and then oil quenching is to room temperature; Second step, is warming up to 980 DEG C, and soaking time is 48h, and finally with stove naturally cooling, can obtain Ti-45Al-8.5Nb-(W, B, the Y) material with tiny topsheet layer tissue, its structure as shown in Figure 1; Its room-temperature mechanical property is tested according to GB228-2002, and carry out three tests altogether, the tensile strength that first time tests is 810MPa, and yield strength is 760MPa, and unit elongation is 1.2%, and reduction of area is 2.5%;
The tensile strength of second time test is 827MPa, and yield strength is 786MPa, and unit elongation is 1.0%, and reduction of area is 2.0%;
Third time, the tensile strength of test was 815MPa, and yield strength is 755MPa, and unit elongation is 1.1%, and reduction of area is 2.3%.
Claims (3)
1. a preparation method for high-niobium TiAl intermetallic compound, is characterized in that step is:
1) high niobium titanium aluminide prealloy powder is carried out ball milling;
2) by step 1) high niobium titanium aluminide prealloy powder after ball milling loads in soft steel jacket, and vacuumizes soft steel jacket;
3) by step 2) in soft steel jacket carry out hot isostatic pressing densification, obtain material pressed compact;
4) removal step 3) soft steel jacket outside the material pressed compact that obtains, obtain high-niobium TiAl intermetallic compound blank;
5) by step 4) the high-niobium TiAl intermetallic compound blank that obtains puts into silica glass jacket, and carry out solution treatment, obtain high-niobium TiAl intermetallic compound material, wherein the molar content of niobium is not less than 5%;
Step 2) in the technique that soft steel jacket vacuumizes be: at room temperature degasification 2h, treat that in soft steel jacket, vacuum tightness is better than 3 × 10
-3after Pa, soft steel jacket is warming up to 260 DEG C, insulation 3h, treats that in soft steel jacket, vacuum tightness is better than 4 × 10
-3after Pa, soft steel jacket is warming up to 680 DEG C, soaking time 12h, finally makes the vacuum tightness in soft steel jacket be better than 1 × 10
-3pa;
Step 3) in the technique that soft steel jacket carries out hot isostatic pressing densification be: temperature is 1280 DEG C, and pressure is 150MPa, and the time is 4h;
Step 5) in the process of solution treatment be: be filled with argon gas in silica glass jacket, pressure is 5MPa, then silica glass jacket is put into process furnace and heat-treats, thermal treatment temp is: the first step, be warming up to 1420 DEG C, soaking time is 60min, and then oil quenching is to room temperature; Second step, is warming up to 980 DEG C, and soaking time is 48h, finally with stove naturally cooling.
2. the preparation method of a kind of high-niobium TiAl intermetallic compound according to claim 1, it is characterized in that: step 1) in ball milling time use titanium alloy ball grinder, and carry out ball milling by diamond to high niobium titanium aluminide prealloy powder, and to be filled with volume ratio in titanium alloy ball grinder be the argon gas of 8:1 and the mixed gas of hydrogen.
3. the preparation method of a kind of high-niobium TiAl intermetallic compound according to claim 1, is characterized in that: step 4) method of middle Vehicle Processing removes soft steel jacket.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104388862B (en) * | 2014-11-11 | 2016-08-31 | 哈尔滨工业大学 | A kind of full sheet layer heat treatment method containing τ 3 phase γ-TiAl intermetallic compound ingot casting |
| CN104498748A (en) * | 2014-11-18 | 2015-04-08 | 航天材料及工艺研究所 | Preparation method of high performance powder metallurgy high-niobium TiAl line intermetallic compound |
| CN105385869B (en) * | 2015-10-30 | 2017-07-07 | 航天材料及工艺研究所 | The preparation method of high-niobium TiAl intermetallic compound and TC4 titanium alloy composite components |
| CN110640142B (en) * | 2019-10-11 | 2022-03-04 | 航天材料及工艺研究所 | Method for preparing TiAl-based alloy component by using carbon steel sheath |
| CN116043053B (en) * | 2023-01-17 | 2023-07-21 | 哈尔滨工业大学 | High-niobium TiAl intermetallic compound with heterogeneous lamellar structure with alternate coarse and fine crystals and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5424027A (en) * | 1993-12-06 | 1995-06-13 | The United States Of America As Represented By The Secretary Of The Air Force | Method to produce hot-worked gamma titanium aluminide articles |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5424027A (en) * | 1993-12-06 | 1995-06-13 | The United States Of America As Represented By The Secretary Of The Air Force | Method to produce hot-worked gamma titanium aluminide articles |
Non-Patent Citations (3)
| Title |
|---|
| 热处理工艺对Ti-45Al-7Nb-0.15B-0.4W显微组织的影响;黄劲松等;《中国有色金属学报》;20050331;第15卷(第3期);第345页 * |
| 热等静压技术制备TiAl合金;陈建勋等;《粉末冶金材料科学与工程》;19990930;第4卷(第3期);第213页 * |
| 马福康.等静压技术.《等静压技术》.冶金工业出版社,1992,第219-221页. * |
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