CN1431338A - Method for preparing coat of aluminide with chrome modified for enhancing performance of high heat oxidation resistance of TiAl alloy - Google Patents
Method for preparing coat of aluminide with chrome modified for enhancing performance of high heat oxidation resistance of TiAl alloy Download PDFInfo
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- CN1431338A CN1431338A CN 02100328 CN02100328A CN1431338A CN 1431338 A CN1431338 A CN 1431338A CN 02100328 CN02100328 CN 02100328 CN 02100328 A CN02100328 A CN 02100328A CN 1431338 A CN1431338 A CN 1431338A
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- penetration enhancer
- aluminide
- coat
- aluminium
- tial alloy
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Abstract
A process for preparing the coated Cr modified Al compound layer on the surface of TiAl alloy in order to improve its resistance to high-temp oxidizing includes quantitatively taking the penetrant which contains Al (8-12 wt.%), Cr (25-35%), sodium chloride (1-3%), ammonium chloride (2-4%) and Al2O3 (rest), grinding while stirring, baking at 110 deg.C, loading in crucible, burying TiAl alloy in it, putting the crucible in electric furnace, introducing argon gas, and heating to 1100 deg.c.
Description
Technical field:
The present invention provides a kind of coat of aluminide with chrome modified system and preparation technology of the TiAl of raising alloy high temperature oxidation corrosion resistance, belongs to the coat of aluminide with chrome modified technology of preparing.
Background technology:
The TiAl intermetallic compound has excellent high-temperature specific tenacity and specific rigidity, is to make one of optimal candidate material of advanced power set of new generation.Yet, the major obstacle that the TiAl intermetallic compound faced be its temperature-room type plasticity low and in high-temperature corrosion environment easy problem such as oxidation.In order to improve the high temperature oxidation resistance of TiAl alloy, all done a large amount of research and discoveries both at home and abroad.Summarize and get up to have two aspects; The one, by alloying, improve the high temperature oxidation resistance of material monolithic, the 2nd, material is carried out surface treatment, protecting materials is not subjected to the infringement of oxygen.From overall development and achievement in research, adding element is limited for improving TiAl alloy antioxidant property, has certain distance with practical application; Therefore, further research also need be devoted to surface treatment.At present, studied the influence of a series of surface treatment method to TiAl alloy antioxidant property, these methods comprise with the pack cementation method and prepare aluminide coating, the aluminum oxide (Al that obtains with plasma spraying method
2O
3) and nickel (Ni) chromium (Cr) aluminium (Al) yttrium (Y) coating etc., these coatings can improve the antioxidant property of TiAl to some extent, but all have a series of problem.Nickel (Ni) chromium (Cr) aluminium (Al) yttrium (Y) coating is at high temperature owing to the problem of existence with the mutual diffusion of TiAl matrix, so this coating can't satisfy requirement of actual application fully.Aluminum oxide (the Al of plasma spraying method preparation
2O
3) coating is more crisp, in the high temperature circulation oxidising process, easily peel off, so this coating can not satisfy requirement of actual application.In the coating process of many raising oxidation-resistances, pack cementation is a kind of relative simple technology but still is widely used.The TiAl alloy has formed the titanium aluminium three (TiAl with tetragonal through surface after the pack cementation aluminizing
3) phase.Although titanium aluminium three (TiAl
3) mutually in aluminium content very high, have and form protectiveness aluminum oxide (Al
2O
3) ability.But, because the titanium aluminium three (TiAl of tetragonal
3) have very low symmetry mutually, thereby titanium aluminium three (TiAl
3) very crisp mutually.Therefore, after the TiAl alloy is handled through pack cementation aluminizing, the TiAl that obtains
3Have a lot of crackles in the coating, in high-temperature oxidation process, airborne oxygen inwardly is diffused into the surface of TiAl matrix by these crackles, thereby forms on the surface and not have an aluminum oxide (Al of protectiveness
2O
3)+titanium oxide (TiO
2) mixture, cause peeling off at high temperature circulation oxidising process floating coat.Result of study shows: at titanium aluminium three (TiAl
3) add 8 atomic percents (at.%) Cr in mutually after, can be with titanium aluminium three (TiAl
3) tetragonal of phase changes into high symmetric cube of L1
2Structure.Result of study shows: body is the aluminium 67 (Al of cube L12 structure
67) titanium 25 (Ti
25) chromium 8 (Cr
8) high temperature oxidation resistance of phase obviously is better than titanium aluminium three (TiAl
3) phase.
The method that the objective of the invention is to adopt aluminium chromium to ooze altogether obtains having a cube L1 at the TiAl alloy surface
2Aluminium 67 (the Al of structure
67) titanium 25 (Ti
25) chromium 8 (Cr
8) coating, to improve the high temperature oxidation resistance of TiAl alloy.
Summary of the invention:
The present invention adopts following technical proposal to realize:
(1) composition and proportioning
Coat of aluminide with chrome modified is pressed atomic percent by aluminium 67 (Al
67) titanium 25 (Ti
25) chromium 8 (Cr
8) wait elementary composition.The preparation coat of aluminide with chrome modified with the proportioning of penetration enhancer is: 8-12.% aluminium (Al) is 200 orders by weight percentage, and 25-35.% chromium (Cr) is 100 orders, and 1-3% sodium-chlor (NaCl) is analytical pure, 2-4.% ammonia chloride (NH
4Cl) be analytical pure, all the other are aluminium sesquioxide (Al
2O
3) be 200 orders.
(2) preparation technology
Bury the aluminide coating that the method for oozing prepares the chromium modification.Its preparation technology is: accurately take by weighing penetration enhancer according to quantity, place grinding to grind the penetration enhancer that takes by weighing, with stirrer ground penetration enhancer is stirred, make its thorough mixing.It is that 110 ℃ baking oven is dried that the penetration enhancer that thorough mixing is good places temperature.The penetration enhancer of the drying crucible of packing into, and sample imbedded in this penetration enhancer, the distance between the sample of parallel placement is not less than 5mm.After the crucible that sample is housed placed high temperature resistance furnace, feed dry argon gas, resistance furnace is heated to 1100 ℃ then,, can be implemented in the coat of aluminide with chrome modified that the TiAl alloy surface prepares different thickness by the control soaking time.
Advantage of the present invention is: after the TiAl alloy was handled through pack cementation aluminizing, top coat was by the TiAl with tetragonal
3Phase composite.Although TiAl
3Mutually middle aluminium content is very high, has the protectiveness of formation aluminum oxide (Al
2O
3) ability.But, because the TiAl of tetragonal
3Have very low symmetry mutually, thereby TiAl
3Very crisp mutually.Therefore, after the TiAl alloy is handled through pack cementation aluminizing, the TiAl that obtains
3Have a lot of crackles in the coating, in high-temperature oxidation process, airborne oxygen inwardly is diffused into the surface of TiAl matrix by these crackles, thereby forms on the surface and not have an aluminum oxide (Al of protectiveness
2O
3)+titanium oxide (TiO
2) mixture, cause peeling off at high temperature circulation oxidising process floating coat.After the TiAl alloy was handled through the calorize of chromium modification, the coating that obtains was by having a cube L1
2Aluminium 67 (the Al of structure
67) titanium 25 (Ti
25) chromium 8 (Cr
8) phase composite.Aluminium 67 (the Al of cubic structure
67) titanium 25 (Ti
25) chromium 8 (Cr
8) mutually not only have very high aluminium content, and have good toughness, thereby make the high temperature oxidation resistance of aluminide coating of chromium modification significantly improve.
Embodiment:
The composition of this embedding penetration enhancer is 10% aluminium (Al) by weight percentage, 30% chromium (Cr), 3% sodium-chlor (NaCl), 4% ammonia chloride (NH
4Cl), 53% aluminium sesquioxide (Al
2O
3) take by weighing; The penetration enhancer that takes by weighing by above-mentioned amount places grinding to grind, and with stirrer ground penetration enhancer is stirred, and makes its thorough mixing; It is that 110 ℃ baking oven is dried that the penetration enhancer that thorough mixing is good places temperature; The penetration enhancer of the drying crucible of packing into, and sample imbedded in this penetration enhancer, distance between the sample of parallel placement is not less than 5mm, after the crucible that sample is housed placed high temperature resistance furnace, feed dry argon gas, diffusion temperature and soaking time are respectively under 1100 ℃ and the 8 hours conditions, the coat of aluminide with chrome modified that deposition obtains was 1100 ℃ of insulations 60 minutes, be cooled to rapidly in five minutes in the thermal cycling test of room temperature, the thermal cycle life of coating has reached 500 hours, 1050 ℃ of insulations 30 minutes, shrend was cooled in the thermal shock test of room temperature rapidly, and the thermal cycle life of coating has reached 150 times; 1100 ℃ of constant temperature oxidations 100 hours, the oxidation weight gain of coating only was 1.08mg/cm
2, reached complete anti-oxidant level, be implemented in the coat of aluminide with chrome modified that the TiAl alloy surface prepares different thickness.
Claims (1)
1, a kind of preparation that improves the coat of aluminide with chrome modified of TiAl alloy resistance to high temperature oxidation, coat of aluminide with chrome modified is made up of aluminium 67, titanium 25 and chromium 8, it is characterized in that: the preparation technology of this coating adopts the method for pack cementation to prepare this coating, and its concrete practice is:
(1), earlier accurately take by weighing penetration enhancer according to quantity, the proportioning of penetration enhancer is by weight percentage: 8-12% aluminium is 200 orders, and 25-35% chromium is 100 orders, and 1-3% sodium-chlor is analytical pure, and the 2-4% ammonia chloride is an analytical pure, and all the other are 200 orders for aluminium sesquioxide;
(2) penetration enhancer that will take by weighing places grinding to grind, and with stirrer ground penetration enhancer is stirred, and makes its thorough mixing;
(3) to place temperature be that 110 ℃ baking oven is dried for penetration enhancer that thorough mixing is good;
(4) the penetration enhancer of the drying crucible of packing into, and sample imbedded in this penetration enhancer, distance between the sample of parallel placement is not less than 5mm, after the crucible that sample is housed placed high temperature resistance furnace, feed dry argon gas, resistance furnace is heated to 1100 ℃ then,, can be implemented in the coat of aluminide with chrome modified that the TiAl alloy surface prepares different thickness by the control soaking time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021003289A CN1166807C (en) | 2002-01-10 | 2002-01-10 | Method for preparing coat of aluminide with chrome modified for enhancing performance of high heat oxidation resistance of TiAL alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021003289A CN1166807C (en) | 2002-01-10 | 2002-01-10 | Method for preparing coat of aluminide with chrome modified for enhancing performance of high heat oxidation resistance of TiAL alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1431338A true CN1431338A (en) | 2003-07-23 |
| CN1166807C CN1166807C (en) | 2004-09-15 |
Family
ID=4739309
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021003289A Expired - Fee Related CN1166807C (en) | 2002-01-10 | 2002-01-10 | Method for preparing coat of aluminide with chrome modified for enhancing performance of high heat oxidation resistance of TiAL alloy |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101310970B (en) * | 2007-05-23 | 2010-12-22 | 中国科学院金属研究所 | Aluminum/aluminum oxide diffusion blocking layer for titanium-aluminum alloy |
| CN102424948A (en) * | 2011-10-24 | 2012-04-25 | 北京航空航天大学 | Method of preparing CoAlNi coating on Ni-based high-temperature alloy through pack cementation |
| CN102485934A (en) * | 2010-12-01 | 2012-06-06 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing hollow blade inner chamber diffusion layer with high temperature resistance, oxidation resistance and corrosion resistance |
| CN104831230A (en) * | 2015-05-15 | 2015-08-12 | 中国南方航空工业(集团)有限公司 | Method for aluminizing and chromizing of K447A alloy part |
| CN104862639A (en) * | 2015-05-29 | 2015-08-26 | 北方民族大学 | Preparation method of high-temperature-resistant, heat-corrosion-resistant and abrasion-resistant coating and penetrating agent |
| CN107779813A (en) * | 2017-12-23 | 2018-03-09 | 北方民族大学 | The preparation technology and its penetration enhancer of titanium-aluminium alloy surface C r Al Ce Y thermal protection coatings |
| CN112626449A (en) * | 2020-11-30 | 2021-04-09 | 中国航发动力股份有限公司 | Preparation method of chromium modified aluminide coating on turbine blade |
-
2002
- 2002-01-10 CN CNB021003289A patent/CN1166807C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101310970B (en) * | 2007-05-23 | 2010-12-22 | 中国科学院金属研究所 | Aluminum/aluminum oxide diffusion blocking layer for titanium-aluminum alloy |
| CN102485934A (en) * | 2010-12-01 | 2012-06-06 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing hollow blade inner chamber diffusion layer with high temperature resistance, oxidation resistance and corrosion resistance |
| CN102485934B (en) * | 2010-12-01 | 2013-06-05 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing hollow blade inner chamber diffusion layer with high temperature resistance, oxidation resistance and corrosion resistance |
| CN102424948A (en) * | 2011-10-24 | 2012-04-25 | 北京航空航天大学 | Method of preparing CoAlNi coating on Ni-based high-temperature alloy through pack cementation |
| CN104831230A (en) * | 2015-05-15 | 2015-08-12 | 中国南方航空工业(集团)有限公司 | Method for aluminizing and chromizing of K447A alloy part |
| CN104862639A (en) * | 2015-05-29 | 2015-08-26 | 北方民族大学 | Preparation method of high-temperature-resistant, heat-corrosion-resistant and abrasion-resistant coating and penetrating agent |
| CN104862639B (en) * | 2015-05-29 | 2017-09-12 | 北方民族大学 | The preparation technology and its penetration enhancer of a kind of high temperature resistant heat and corrosion resistant anti-scuff coating |
| CN107779813A (en) * | 2017-12-23 | 2018-03-09 | 北方民族大学 | The preparation technology and its penetration enhancer of titanium-aluminium alloy surface C r Al Ce Y thermal protection coatings |
| CN112626449A (en) * | 2020-11-30 | 2021-04-09 | 中国航发动力股份有限公司 | Preparation method of chromium modified aluminide coating on turbine blade |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1166807C (en) | 2004-09-15 |
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