EP3309266A1 - Method of making a molybdenum alloy having a high titanium content - Google Patents
Method of making a molybdenum alloy having a high titanium content Download PDFInfo
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- EP3309266A1 EP3309266A1 EP16193634.9A EP16193634A EP3309266A1 EP 3309266 A1 EP3309266 A1 EP 3309266A1 EP 16193634 A EP16193634 A EP 16193634A EP 3309266 A1 EP3309266 A1 EP 3309266A1
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- EP
- European Patent Office
- Prior art keywords
- powders
- alloy
- iii
- molybdenum
- powder
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- 239000010936 titanium Substances 0.000 title claims abstract description 64
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 36
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001182 Mo alloy Inorganic materials 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 133
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 59
- 239000000956 alloy Substances 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 55
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 39
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 19
- 238000005245 sintering Methods 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- 229910052796 boron Inorganic materials 0.000 claims abstract description 14
- 239000010703 silicon Substances 0.000 claims abstract description 13
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910021332 silicide Inorganic materials 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 150000004767 nitrides Chemical class 0.000 claims abstract description 7
- 150000002739 metals Chemical class 0.000 claims abstract description 5
- 238000001272 pressureless sintering Methods 0.000 claims abstract description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 22
- 239000011733 molybdenum Substances 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 229910052735 hafnium Inorganic materials 0.000 claims description 14
- 229910052758 niobium Inorganic materials 0.000 claims description 14
- 229910052721 tungsten Inorganic materials 0.000 claims description 13
- 229910052726 zirconium Inorganic materials 0.000 claims description 13
- 229910052727 yttrium Inorganic materials 0.000 claims description 11
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 9
- 229910052582 BN Inorganic materials 0.000 claims description 6
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 6
- 229910009871 Ti5Si3 Inorganic materials 0.000 claims description 5
- 229910015501 Mo3Si Inorganic materials 0.000 claims description 4
- -1 MoTi5SiB2 Inorganic materials 0.000 claims description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 abstract description 13
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 5
- 239000011261 inert gas Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 28
- 239000010955 niobium Substances 0.000 description 14
- 238000002844 melting Methods 0.000 description 12
- 230000008018 melting Effects 0.000 description 12
- 238000001513 hot isostatic pressing Methods 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 9
- 238000005275 alloying Methods 0.000 description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 8
- 239000010937 tungsten Substances 0.000 description 8
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 7
- 238000000889 atomisation Methods 0.000 description 7
- 238000009694 cold isostatic pressing Methods 0.000 description 7
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 7
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000470 constituent Substances 0.000 description 5
- 239000011369 resultant mixture Substances 0.000 description 5
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910020015 Nb W Inorganic materials 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000009689 gas atomisation Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910016027 MoTi Inorganic materials 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 229910000946 Y alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- ZPZCREMGFMRIRR-UHFFFAOYSA-N molybdenum titanium Chemical compound [Ti].[Mo] ZPZCREMGFMRIRR-UHFFFAOYSA-N 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical class [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000005029 sieve analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- 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
- C22C1/045—Alloys based on refractory metals
-
- 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
- C22C1/058—Mixtures of metal powder with non-metallic powder by reaction sintering (i.e. gasless reaction starting from a mixture of solid metal compounds)
-
- 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
- C22C1/10—Alloys containing non-metals
- C22C1/1084—Alloys containing non-metals by mechanical alloying (blending, milling)
-
- 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
- C22C32/0047—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 carbides, nitrides, borides or silicides as the main non-metallic constituents
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/088—Fluid nozzles, e.g. angle, distance
-
- 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
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/20—Refractory metals
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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
- B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
- B22F2302/20—Nitride
Definitions
- the present invention relates to a method of making a molybdenum alloy having a high titanium content which is suitable, for example, for the production of structural components, in particular of components, preferably vanes and blades, of turbomachines such as gas turbines and aircraft engines.
- Ternary molybdenum alloys which comprise molybdenum, silicon and boron as main alloying constituents.
- such alloys do not exhibit sufficient creep resistance.
- Attempts to increase the creep resistance with very finely dispersed particles of titanium, zirconium and carbon, as described, for example, in WO 85/03953 A1 have likewise not led to the desired results.
- US 2016/0060734 A1 discloses alloys which are suitable for the production of structural components such as vanes and blades of turbomachines and comprise molybdenum, silicon, boron and titanium as main components.
- structural components such as vanes and blades of turbomachines and comprise molybdenum, silicon, boron and titanium as main components.
- titanium metal due to the high reactivity of titanium metal with inter alia, oxygen, nitrogen, carbon and hydrogen and its propensity to form stable non-metallic compounds with these elements corresponding alloys are difficult and expensive to produce. If titanium is consumed by reacting with the above elements it is no longer available for the desired phase formation as Mo-Ti silicide and Mo-Ti mixed crystal. These phases are essential for achieving the properties which are required if the alloy is to be used for manufacturing turbine rotor blades and guide vanes.
- DE 10 2011 013 894 A1 discloses a process for the final shape production of components made of a (titanium-free) material comprising intermetallic phases of trimolybdenum silicide and molybdenum borosilicide homogeneously distributed in a molybdenum matrix, which process comprises subjecting a starting powder mixture that comprises at least molybdenum
- the problem underlying the present invention is to provide a method for the production of molybdenum alloys which contain high concentrations of titanium and are suitable for the production of structural components which are subjected to high temperatures and high stress in a simple and cost-efficient manner.
- the present invention provides a method for making a molybdenum alloy which has a high titanium content and further comprises at least silicon and/or boron.
- the method comprises subjecting to (pressureless) sintering under vacuum or sintering under pressure in an inert or reducing gas atmosphere (e.g., an Ar/H 2 atmosphere) a mixture of powders which comprise (i) one or more powders of an alloy of Mo and Ti and, optionally, one or more additional metals X and/or (i') powders of Mo and of titanium nitride (hereafter TiN) and at least one of (ii) one or more powders comprising one or more powders of silicides (and preferably also borides) of Mo and/or Ti and (iii) one or more powders of nitrides which comprise silicon nitride (hereafter Si 3 N 4) powder and/or boron nitride (hereafter BN) powder (in particular, at least silicon nitride
- X if present in the alloy of Mo and Ti, is selected from one or more (e.g., one, two, three or more) of Fe, Y, Hf, Nb, Zr and W.
- X may at least be Fe.
- one or more powders (i) are employed.
- the one or more powders (i) may be substantially spherical and may have a median particle size d50 (as determined by, e.g., laser diffraction) in the range from 0.001 ⁇ m to 50 ⁇ m, in particular from 0.001 ⁇ m to 40 ⁇ m, e.g., from 0.001 to 30 ⁇ m.
- one or more powders (i') (and preferably no powders (i)) are employed.
- the one or more powders (i') are substantially spherical and have a median particle size d50 (as determined by, e.g., laser diffraction) in the range from 0.01 ⁇ m to 100 ⁇ m, in particular from 0.1 ⁇ m to 50 ⁇ m, e.g., from 0.01 to 2 ⁇ m.
- one or more powders (ii) (and preferably no powders (iii)) are be employed.
- the one or more silicide powders (ii) may comprise powders of MoTi 5 Si 3 , Ti 5 Si 3 , MoTi 5 SiB 2 , Mo 3 Si or combinations of two or more thereof.
- one or more powders (iii) (and preferably no powders (ii)) are employed.
- the one or more powders (iii) may comprise one or more powders of silicon nitride and/or one or more powders of boron nitride.
- the powders (iii) may comprise at least one or more powders of silicon nitride.
- both silicon nitride powder(s) and boron nitride powder(s) are employed as powders (iii).
- the powders (i) and/or (i') and the powders (ii) and/or (iii) are combined in ratios which result in an alloy which comprises at least 35 at.% of molybdenum and/or not more than 66 at.% of molybdenum and/or at least 25 at.% of titanium and/or not more than 33 at.% of titanium and/or at least 9 at.% of silicon and/or not more than 15 at.% of silicon and/or at least 5 at.% of boron and/or not more than 9 at.% of boron.
- the alloy comprises at least 0.1 at.% of Fe and/or not more than 5 at.% of Fe.
- the present invention also provides an alloy which is obtainable by the method set forth above (including the various refinements thereof), as well as an article (e.g. a component of a turbine such as a rotor blade or guide vane) which is made of or comprises this alloy.
- the method according to the present invention comprises subjecting to pressureless sintering or sintering under pressure a mixture of powders which comprise (i) one or more powders of an alloy of Mo and Ti and, optionally, one or more additional metals X (e.g., one or more of Fe, Y, Hf, Nb, Zr, W and preferably at least Fe) and/or (i') powders of Mo and of TiN, and further comprise (ii) one or more powders comprising one or more powders of silicides (and preferably also borides) of Mo and/or Ti and/or (iii) one or more powders of nitrides which comprise Si 3 N 4 powder and/or BN powder.
- powders (iii) may not comprise Si 3 N 4 powder.
- the powders (i) may either be purchased (e.g. from H. C. Starck, Germany) or may be prepared, for example, by atomization in an inert gas atmosphere (preferably high purity argon) of a block or ingot of an alloy of Mo, Ti and, optionally, X to obtain a powder with particles which will usually be substantially spherical and will have a particle size (longest dimension and/or diameter) of less than 45 ⁇ m (particularly less than 10 ⁇ m, e.g., less than 1 ⁇ m).
- an inert gas atmosphere preferably high purity argon
- the alloy can be prepared, for example, by melting together (e.g., by plasma melting or arc melting) powders of metallic Mo, Ti and optionally one or more metals X and/or corresponding pre-alloys such as, e.g., Mo 80 Ti 20 , Mo 70 Ti 30 , Mo 60 Ti 40 , etc. (e.g., in powder form). Powders (i') may be prepared, for example, by reducing molybdenum oxides with e.g., hydrogen and by nitriding Ti powder, respectively.
- the phrase "less than z ⁇ m" as used herein is intended to mean that at least 95 % by weight, e.g., at least 98 % by weight, or at least 99 % by weight of the particles have a longest dimension or diameter of z ⁇ m.
- the particle size can be determined by methods well known to those of skill in the art, for example by sieve analysis or optical methods such as laser diffraction.
- the atomization of an ingot or block may, for example, be carried out by an EIGA (Electrode Induction melting Gas Atomization) process or by gas atomization using a Laval nozzle (preferably using high purity argon).
- the atomization may optionally be preceded by subjecting the alloy obtained by, e.g., arc melting or plasma melting to hot isostatic pressing (HIP), e.g., at a temperature of from 1,300°C to 1,500°C and at a pressure of from 100 to 300 MPa for 5 to 10 hours.
- HIP hot isostatic pressing
- a heat treatment may be carried out, e.g., at a temperature of from 1,300°C to 1,600°C for 5 to 50 hours.
- Non-limiting examples of commercially available powders (i) for use in the instant method have a median particle size d50 in the range from 0.01 ⁇ m to 50 ⁇ m (at a purity of, e.g., from 95 % to 99.9 % by weight) or a d50 of from 0.01 ⁇ m to 30 ⁇ m (at a purity of, e.g., from 98 % to 99.9 % by weight).
- the alloy of Mo, Ti and, optionally, X for making the one or more powders (i) may, for example, comprise (in % by weight based on the total weight of the alloy):
- Fe, Nb, Zr, W, Hf and Y may be present in the alloy.
- the alloy for making the one or more powders (i) preferably does not contain any (or at most only trace amounts) of Si and B because the presence of these elements will cause the alloy to become brittle. The same applies to the one or more powders (i').
- Non-limiting examples of commercially available Mo powders (i') for use in the instant method have a median particle size d50 in the range from 0.1 ⁇ m to 50 ⁇ m (at a purity of, e.g., from 95 % to 99.9 % by weight) or a d50 of 0.5 ⁇ m to 2 ⁇ m (at a purity of, e.g., from 98 % to 99.9 % by weight).
- d50 in the range from 0.1 ⁇ m to 50 ⁇ m (at a purity of, e.g., from 95 % to 99.9 % by weight) or a d50 of 0.5 ⁇ m to 2 ⁇ m (at a purity of, e.g., from 98 % to 99.9 % by weight).
- the one or more powders (ii) for use in the instant method may comprise powders of one or more of Mo(Ti) 5 Si 3 , Ti 5 Si 3 , Mo(Ti) 5 SiB 2 , Mo 3 Si.
- the one or more powders (ii) may either be purchased (e.g., from H. C. Starck, Germany) or may be prepared by, for example, arc melting (usually in an argon atmosphere) from elemental Mo, Ti and Si (and preferably B), usually in the form of powders of the elements and/or corresponding pre-alloys.
- the powders (ii) will usually comprise one or more phases of formula MoTi 5 Si 3 , Ti 5 Si 3 , MoTi, and MoTi 5 SiB 2 and/or corresponding substoichiometric or hyperstoichometric phases.
- these phases may contain more or less Si and/or B than indicated, or may contain Mo and/or Ti, which can activate the sintering process and can result in high sinter densities (e.g., > 95 %).
- the powders (ii) for use in the instant method will usually have a median particle size d50 (as determined by, e.g., laser diffraction) in the range from 0.001 ⁇ m to 50 ⁇ m, in particular from 0.001 ⁇ m to 40 ⁇ m, e.g., 0.001 to 30 ⁇ m.
- d50 median particle size
- Non-limiting examples of commercially available powders (ii) for use in the instant method may have a median particle size d50 as follows:
- the powders (iii) for use in the instant method will usually have a median particle size d50 (as determined by, e.g., laser diffraction) in the range from 0.001 ⁇ m to 50 ⁇ m, e.g., from 0.001 ⁇ m to 40 ⁇ m, or from 0.001 to 30 ⁇ m.
- d50 median particle size
- Non-limiting examples of commercially available powders (iii) for use in the instant method may have a median particle size d50 as follows:
- the powders (i) and/or (i') and the powders (ii) and/or (iii) are mixed and optionally milled, and then subjected to a sintering process (either pressureless or under pressure in a reducing or inert gas atmosphere, e.g., an atmosphere consisting essentially of Ar/H 2 or helium).
- a sintering process either pressureless or under pressure in a reducing or inert gas atmosphere, e.g., an atmosphere consisting essentially of Ar/H 2 or helium.
- the mixed (and optionally milled) powders Prior to sintering the mixed (and optionally milled) powders will usually be combined with a preferably organic binder (e.g., an organic wax) and then subjected to cold isostatic pressing (CIP) at room temperature, e.g., at a pressure of from 100 to 300 MPa for, e.g., 5 to 60 minutes, to form a green body.
- a preferably organic binder e.g., an organic wax
- CIP cold isostatic pressing
- the one or more powders (i) or (i') are usually mixed with the one or more powders (ii) and/or (iii) in ratios which result in a weight percentage of the one or more powders (i) and/or the one or more powders (i') of at least 85 %, e.g., at least 88 %, at least 90 %, at least 92 %, or at least 94 % by weight, but usually not higher than 97 %, e.g., not higher than 96 % by weight, based on the total weight of the powder mixture (i.e., without optional binder).
- weight percentages of powders (i) and (iii) in a corresponding mixture may be as follows:
- the sintering (or reaction sintering if nitrides are present) is usually carried out in several (e.g., two, three or four) steps at different temperatures.
- the sintering may be carried out, in each case with a holding time of from 1 to 3 hours, (1) at a temperature of from 350°C to 450°C (e.g., at about 400°C) to decompose the optionally present organic binder, (2) at a temperature of from 650°C to 750°C (e.g., at about 700°C) to decompose nitrides, if present, (3) at a temperature of from 1,150°C to 1,250°C (e.g., at about 1,200°C) and (4) at a temperature of from 1,650°C to 1,750°C (e.g., at about 1,700°C).
- the sintered body thus obtained may optionally be subjected to hot isostatic pressing (HIP), e.g., at a temperature of from 1,300°C to 1,500°C and at a pressure of from 100 to 300 MPa for 5 to 10 hours.
- HIP hot isostatic pressing
- a heat treatment may be carried out, e.g., at a temperature of from 1,300°C to 1,600°C for 5 to 50 hours.
- the sintered body may also be subjected to forming (optionally preceded by HIP and/or heat treatment(s) as set forth above) such as, e.g., rolling, extrusion, forging (e.g., isothermal or "hot die”), optionally followed by a heat treatment as set forth above.
- HIP and/or heat treatment(s) such as, e.g., rolling, extrusion, forging (e.g., isothermal or "hot die"), optionally followed by a heat treatment as set forth above.
- the sintering (and the CIP) can be replaced by a generative production method, e.g. by using a laser with which a desired structure is built up layer by layer, the laser being used to sinter each deposited layer of powder material before the next layer of powder material is deposited.
- a powder (i) was prepared by arc melting of a powder mixture of elemental Mo (81 % by weight), Ti (18 % by weight) and Fe (1 % by weight) to form an ingot, followed by atomization of the ingot by means of a Laval nozzle.
- the resultant product showed the following (approximate) concentrations (in at.%): Mo 57 Ti 25 Fe 1 Si 9 B 8
- a powder (i) is prepared by plasma melting of a powder mixture of elemental Mo, Ti, Fe and Hf to form an ingot, followed by atomization of the ingot by means of a Laval nozzle.
- the powder (i) is then mixed with powders (iii) of Si 3 N 4 and BN and an organic binder and the resultant mixture is subjected to CIP and thereafter to reaction sintering at temperatures of about 400°C, about 700°C, about 1,200°C and about 1,700°C, each for about 1-3 hours in a reducing atmosphere or in vacuum, followed by a heat treatment at about 1,400°C for about 10 hours and HIP for about 5 hours at about 1,400°C and about 150 MPa.
- a powder (i) is prepared by arc melting or plasma melting of a powder mixture of elemental Mo, Ti, Fe, Y, Hf, Nb, Zr and W to form an ingot, followed by an optional heat treatment, optional HIP and atomization of the ingot by means of a Laval nozzle or by means of an EIGA method.
- the powder (i) is then mixed with powders (iii) of Si 3 N 4 and BN and an organic binder and the resultant mixture is subjected to CIP and thereafter to reaction sintering at temperatures of about 400°C, about 700°C, about 1,200°C and about 1,700°C, each for about 1-3 hours in a reducing atmosphere or in vacuum, followed by optional HIP for about 5 to about 10 hours at a temperature of from about 1,300°C to about 1,500°C and a pressure of from about 100 to about 300 MPa, forming by rolling, extrusion or forging at a temperature of higher than 1,600°C and a subsequent heat treatment for about 5 to about 50 hours at a temperature of from about 1,300°C to about 1,600°C.
- a powder (i) is prepared by plasma melting of a powder mixture of elemental Mo, Ti and Fe to form an ingot, followed by atomization of the ingot by means of a Laval nozzle.
- the powder (i) is then mixed with powders (ii) of Mo(Ti) 5 Si 3 and Mo(Ti) 5 SiB 2 and an organic binder and the resultant mixture is subjected to CIP and thereafter to sintering at temperatures of about 400°C, about 1,200°C and about 1,700°C, each for about 1-3 hours in a reducing atmosphere or in vacuum, followed by a heat treatment at about 1,400°C for about 10 hours and HIP for about 5 hours at about 1,400°C and about 150 MPa.
- a powder mixture (i') of elemental Mo and of TiN is mixed with powders (iii) of Si 3 N 4 and BN and an organic binder and the resultant mixture is subjected to CIP and thereafter to reaction sintering at temperatures of about 400°C, about 700°C, about 1,200°C and about 1,700°C, each for about 1-3 hours in a reducing atmosphere or in vacuum, followed by a heat treatment at about 1,400°C for about 10 hours and HIP for about 5 hours at about 1,400°C and about 150 MPa.
- the method of the present invention is suitable for making molybdenum alloys which have a high titanium content.
- the term "molybdenum alloy” as used herein and in the appended claims refers to an alloy in which the element molybdenum makes up the greatest alloying fraction in at.%. In other words, in a molybdenum alloy, there is no other element which has a greater alloying fraction in at.% than Mo.
- the molybdenum content of the alloy in at.% will usually be at least 30 at.%, preferably at least 35 at.%, and in particular at least 40 at.%, e.g., at least 45 at.% (based on all elements present in the alloy, as in the following).
- High titanium content refers to a titanium content of at least 15 at.%, preferably at least 20 at.% and particularly at least 25 at.%, e.g., at least 30 at. %.
- the alloy made by the instant method may further comprise iron and/or yttrium, each in a concentration of from 0.1 to 5 at.%, in particular in a concentration of from 0.3 to 3 at.%.
- iron may be present in a concentration of from 0.5 to 3 at.%, in particular from 0.8 to 2 at.%
- yttrium may be present in a concentration of from 0.3 to 3 at.%, in particular from 0.5 to 2 at.%.
- the alloy produced by the method of the present invention may further comprise one or more of zirconium, niobium, hafnium, and tungsten.
- zirconium may be present in a concentration of not more than 5 at.%, in particular in a concentration of from 0.3 to 3 at.%
- niobium may be present in a concentration of not more than 20 at.%, in particular in a concentration of from 0.3 to 10 at.%
- tungsten may be present in a concentration of not more than 8 at.%, in particular in a concentration of from 0.3 to 5 at.%
- hafnium may be present in a concentration of not more than 5 at.%, in particular in a concentration of from 0.3 to 3 at.%.
- the alloy of the present invention may comprise silicon in a concentration of from 9 to 15 at.%, in particular in a concentration of from 12 to 14 at.%, and/or boron in a concentration of from 5 to 9 at.%, in particular in a concentration of from 5 to 6 at.%, and/or titanium in a concentration of from 25 to 33 at.%, in particular in a concentration of from 26 to 29 at.%.
- the alloy may, for example, be formed exclusively of molybdenum, silicon, boron, titanium, iron, yttrium, niobium, tungsten, zirconium, hafnium (and unavoidable impurities), or may be formed exclusively of molybdenum, silicon, boron, titanium, iron, yttrium (or hafnium).
- molybdenum may be present in a concentration of from 35 to 66 at.%, in particular in a concentration of from 40 to 60 at.%, e.g., from 45 to 57 at.%, or in a concentration such that the alloy comprises 100 at.% together with the remaining alloying constituents mentioned.
- the true density of the produced alloy may be less than or equal to 9 g/cm 3 , in particular less than or equal to 8.5 g/cm 3 , or less than or equal to 8 g/cm 3 .
- the structure of the alloy may comprise a matrix of a molybdenum mixed crystal and silicide phases, the silicide phases being formed in particular by Mo(Ti) 5 Si 3 and/or Mo(Ti) 5 SiB 2 .
- the alloy may comprise from 15 to 35 vol.%, in particular from 25 to 35 vol.% Mo(Ti) 5 Si 3 and from 15 to 35 vol.%, in particular from 15 to 25 vol.% Mo(Ti) 5 SiB 2 and from 1 to 20 vol.% minor phases.
- the alloy may comprise from 45 to 55 vol.%, in particular from 48 to 55 vol.%, molybdenum mixed crystal or a fraction of molybdenum mixed crystal such that the alloy together with the remaining phase constituents comprises 100 vol.%.
- niobium and tungsten may additionally be present in the alloy.
- the addition of niobium improves the fracture toughness and therefore the deformability or ductility, whereas tungsten improves the oxidation resistance of the alloy.
- the alloy is formed exclusively of the elements molybdenum, silicon, boron, titanium, iron, yttrium, niobium, tungsten, hafnium and zirconium, wherein the fraction of niobium, tungsten, hafnium and zirconium may be 0 at.%.
- an alloy can comprise further elements as unavoidable impurities, wherein, however, none of these further elements should make up more than 1 at.%, preferably more than 0.1 at.%, in the alloy.
- alloys can be produced by the method of the present invention which, in addition to unavoidable impurities, exclusively comprise Mo, Si, B, Ti, Fe, Y, Zr, Nb, Hf and/or W.
- Mo-Si-B-Ti-Fe-, Mo-Si-B-Ti-Fe-Zr-, Mo-Si-B-Ti-Fe-Y-, Mo-Si-B-Ti-Fe-Y-Nb- and Mo-Si-B-Ti-Fe-Y-Nb-W alloys can be produced, likewise a Mo-Si-B-Ti-Y alloy which does not comprise iron, although an alloy containing iron is preferred in principle.
- the alloy composition can in particular also be selected in such a manner that the true density, that is to say the density without any pores or cavities, is adjusted to be less than or equal to 9 g/cm 3 , in particular less than or equal to 8.5 g/cm 3 , preferably less than or equal to 8 g/cm 3 .
- the corresponding structure of the alloy can be adjusted in such a manner that the structure has a matrix of molybdenum mixed crystal (e.g., molybdenum-titanium mixed crystal), into which the silicide phases are incorporated, wherein the silicide phases can be formed by Mo(Ti) 5 Si 3 and/or Mo(Ti) 5 SiB 2 .
- molybdenum can be replaced by titanium and vice versa.
- the molybdenum alloy made by the method of the present invention may comprise from 15 to 35 vol.%, e.g., from 25 to 35 vol.% Mo(Ti) 5 Si 3 and from 15 to 35 vol.%, e.g., from 15 to 25 vol.% Mo(Ti) 5 SiB 2 and from 1 to 20 vol.%, e.g., from 1 to 5 vol.%, minor phases.
- Minor phases can comprise various phases, in particular various mixed phases or mixed crystals of the alloying elements present in the alloy.
- the molybdenum alloy may additionally comprise from 45 to 55 vol.%, in particular from 48 to 55 vol.%, molybdenum mixed crystal or a fraction of molybdenum mixed crystal such that the alloy together with the remaining phase constituents comprises 100 vol.%.
- components of turbomachines preferably of gas turbines or aero engines can be manufactured, wherein the components can be, in particular, rotor blades or guide vanes of the turbomachine, and in particular guide vanes or rotor vanes of rapidly running uncooled low-pressure turbines.
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Abstract
Description
- The present invention relates to a method of making a molybdenum alloy having a high titanium content which is suitable, for example, for the production of structural components, in particular of components, preferably vanes and blades, of turbomachines such as gas turbines and aircraft engines.
- Ternary molybdenum alloys are already known which comprise molybdenum, silicon and boron as main alloying constituents. However, when used at high temperatures, for example in the range from 900°C to 1300°C, such alloys do not exhibit sufficient creep resistance. Attempts to increase the creep resistance with very finely dispersed particles of titanium, zirconium and carbon, as described, for example, in
WO 85/03953 A1 -
US 2016/0060734 A1 discloses alloys which are suitable for the production of structural components such as vanes and blades of turbomachines and comprise molybdenum, silicon, boron and titanium as main components. However, due to the high reactivity of titanium metal with inter alia, oxygen, nitrogen, carbon and hydrogen and its propensity to form stable non-metallic compounds with these elements corresponding alloys are difficult and expensive to produce. If titanium is consumed by reacting with the above elements it is no longer available for the desired phase formation as Mo-Ti silicide and Mo-Ti mixed crystal. These phases are essential for achieving the properties which are required if the alloy is to be used for manufacturing turbine rotor blades and guide vanes. -
DE 10 2011 013 894 A1 discloses a process for the final shape production of components made of a (titanium-free) material comprising intermetallic phases of trimolybdenum silicide and molybdenum borosilicide homogeneously distributed in a molybdenum matrix, which process comprises subjecting a starting powder mixture that comprises at least molybdenum - (80 mass) and additionally silicon nitride and boron nitride to a grinding process; producing a suspension with the ground starting powder mixture that comprises at least an organic binder; introducing the resulting suspension into a metal powder injection molding tool or constructing a green body in layers by screen printing; subjecting the placed green body to thermal and/or chemical treatment for expelling the organic components; and performing an unpressurized sintering in a non-oxidizing atmosphere or in high-vacuum conditions at 1600 °C. A similar process is disclosed in
US 2009/0011266 A1 . - The problem underlying the present invention is to provide a method for the production of molybdenum alloys which contain high concentrations of titanium and are suitable for the production of structural components which are subjected to high temperatures and high stress in a simple and cost-efficient manner.
- The above problem is solved by a method according to claim 1. Advantageous refinements of the method are set forth in the dependent claims. The problem is also solved by an alloy obtainable by the method and an article made from the alloy.
- The present invention provides a method for making a molybdenum alloy which has a high titanium content and further comprises at least silicon and/or boron. The method comprises subjecting to (pressureless) sintering under vacuum or sintering under pressure in an inert or reducing gas atmosphere (e.g., an Ar/H2 atmosphere) a mixture of powders which comprise (i) one or more powders of an alloy of Mo and Ti and, optionally, one or more additional metals X and/or (i') powders of Mo and of titanium nitride (hereafter TiN) and at least one of (ii) one or more powders comprising one or more powders of silicides (and preferably also borides) of Mo and/or Ti and (iii) one or more powders of nitrides which comprise silicon nitride (hereafter Si3N4) powder and/or boron nitride (hereafter BN) powder (in particular, at least silicon nitride powder and preferably both silicon nitride powder and boron nitride powder).
- In advantageous refinements of the method according to the present invention, X, if present in the alloy of Mo and Ti, is selected from one or more (e.g., one, two, three or more) of Fe, Y, Hf, Nb, Zr and W. For example, X may at least be Fe.
- In further advantageous refinements of the method according to the present invention, one or more powders (i) (and preferably no powders (i')) are employed. The one or more powders (i) may be substantially spherical and may have a median particle size d50 (as determined by, e.g., laser diffraction) in the range from 0.001 µm to 50 µm, in particular from 0.001 µm to 40 µm, e.g., from 0.001 to 30 µm.
- In further advantageous refinements of the method according to the present invention, one or more powders (i') (and preferably no powders (i)) are employed. Preferably, the one or more powders (i') are substantially spherical and have a median particle size d50 (as determined by, e.g., laser diffraction) in the range from 0.01 µm to 100 µm, in particular from 0.1 µm to 50 µm, e.g., from 0.01 to 2 µm.
- In further advantageous refinements of the method according to the present invention, one or more powders (ii) (and preferably no powders (iii)) are be employed. The one or more silicide powders (ii) may comprise powders of MoTi5Si3, Ti5Si3, MoTi5SiB2, Mo3Si or combinations of two or more thereof.
- In further advantageous refinements of the method according to the present invention, one or more powders (iii) (and preferably no powders (ii)) are employed. The one or more powders (iii) may comprise one or more powders of silicon nitride and/or one or more powders of boron nitride. For example, the powders (iii) may comprise at least one or more powders of silicon nitride. In a preferred embodiment, both silicon nitride powder(s) and boron nitride powder(s) are employed as powders (iii).
- In further advantageous refinements of the method according to the present invention, the powders (i) and/or (i') and the powders (ii) and/or (iii) are combined in ratios which result in an alloy which comprises at least 35 at.% of molybdenum and/or not more than 66 at.% of molybdenum and/or at least 25 at.% of titanium and/or not more than 33 at.% of titanium and/or at least 9 at.% of silicon and/or not more than 15 at.% of silicon and/or at least 5 at.% of boron and/or not more than 9 at.% of boron. Preferably, the alloy comprises at least 0.1 at.% of Fe and/or not more than 5 at.% of Fe.
- The present invention also provides an alloy which is obtainable by the method set forth above (including the various refinements thereof), as well as an article (e.g. a component of a turbine such as a rotor blade or guide vane) which is made of or comprises this alloy.
- The particulars of the method according to the present invention set forth below are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description making apparent to those of skill in the art how the several forms of the present invention may be embodied in practice.
- As set forth above, the method according to the present invention comprises subjecting to pressureless sintering or sintering under pressure a mixture of powders which comprise (i) one or more powders of an alloy of Mo and Ti and, optionally, one or more additional metals X (e.g., one or more of Fe, Y, Hf, Nb, Zr, W and preferably at least Fe) and/or (i') powders of Mo and of TiN, and further comprise (ii) one or more powders comprising one or more powders of silicides (and preferably also borides) of Mo and/or Ti and/or (iii) one or more powders of nitrides which comprise Si3N4 powder and/or BN powder. Especially in cases where powders (iii) are employed in combination with powders (ii), powders (iii) may not comprise Si3N4 powder.
- The powders (i) may either be purchased (e.g. from H. C. Starck, Germany) or may be prepared, for example, by atomization in an inert gas atmosphere (preferably high purity argon) of a block or ingot of an alloy of Mo, Ti and, optionally, X to obtain a powder with particles which will usually be substantially spherical and will have a particle size (longest dimension and/or diameter) of less than 45 µm (particularly less than 10 µm, e.g., less than 1 µm). The alloy can be prepared, for example, by melting together (e.g., by plasma melting or arc melting) powders of metallic Mo, Ti and optionally one or more metals X and/or corresponding pre-alloys such as, e.g., Mo80Ti20, Mo70Ti30, Mo60Ti40, etc. (e.g., in powder form). Powders (i') may be prepared, for example, by reducing molybdenum oxides with e.g., hydrogen and by nitriding Ti powder, respectively. In this regard it is to be noted that the phrase "less than z µm" as used herein is intended to mean that at least 95 % by weight, e.g., at least 98 % by weight, or at least 99 % by weight of the particles have a longest dimension or diameter of z µm. The particle size can be determined by methods well known to those of skill in the art, for example by sieve analysis or optical methods such as laser diffraction.
- The atomization of an ingot or block may, for example, be carried out by an EIGA (Electrode Induction melting Gas Atomization) process or by gas atomization using a Laval nozzle (preferably using high purity argon). The atomization may optionally be preceded by subjecting the alloy obtained by, e.g., arc melting or plasma melting to hot isostatic pressing (HIP), e.g., at a temperature of from 1,300°C to 1,500°C and at a pressure of from 100 to 300 MPa for 5 to 10 hours. Prior to and/or after the hot isostatic pressing a heat treatment may be carried out, e.g., at a temperature of from 1,300°C to 1,600°C for 5 to 50 hours.
- Non-limiting examples of commercially available powders (i) for use in the instant method have a median particle size d50 in the range from 0.01 µm to 50 µm (at a purity of, e.g., from 95 % to 99.9 % by weight) or a d50 of from 0.01 µm to 30 µm (at a purity of, e.g., from 98 % to 99.9 % by weight).
- The alloy of Mo, Ti and, optionally, X for making the one or more powders (i) may, for example, comprise (in % by weight based on the total weight of the alloy):
- Mo
- from 55 to 95, preferably from 60 to 85
- Ti
- from 10 to 30, preferably from 15 to 25
- Fe
- from 0 to 3, preferably from 1 to 2
- Nb
- from 0 to 30, preferably from 10 to 20
- Zr
- from 0 to 10, preferably from 2 to 4
- W
- from 0 to 20, preferably from 4 to 10
- Hf
- from 0 to 3, preferably from 1 to 2
- Y
- from 0 to 3, preferably from 1 to 2.
- If present, one, two, three, four, five or all of Fe, Nb, Zr, W, Hf and Y may be present in the alloy.
- The alloy for making the one or more powders (i) preferably does not contain any (or at most only trace amounts) of Si and B because the presence of these elements will cause the alloy to become brittle. The same applies to the one or more powders (i').
- Non-limiting examples of commercially available Mo powders (i') for use in the instant method have a median particle size d50 in the range from 0.1 µm to 50 µm (at a purity of, e.g., from 95 % to 99.9 % by weight) or a d50 of 0.5 µm to 2 µm (at a purity of, e.g., from 98 % to 99.9 % by weight). The same applies to TiN powders.
- The one or more powders (ii) for use in the instant method may comprise powders of one or more of Mo(Ti)5Si3, Ti5Si3, Mo(Ti)5SiB2, Mo3Si. The one or more powders (ii) may either be purchased (e.g., from H. C. Starck, Germany) or may be prepared by, for example, arc melting (usually in an argon atmosphere) from elemental Mo, Ti and Si (and preferably B), usually in the form of powders of the elements and/or corresponding pre-alloys. The powders (ii) will usually comprise one or more phases of formula MoTi5Si3, Ti5Si3, MoTi, and MoTi5SiB2 and/or corresponding substoichiometric or hyperstoichometric phases. For example, these phases may contain more or less Si and/or B than indicated, or may contain Mo and/or Ti, which can activate the sintering process and can result in high sinter densities (e.g., > 95 %).
- The powders (ii) for use in the instant method will usually have a median particle size d50 (as determined by, e.g., laser diffraction) in the range from 0.001 µm to 50 µm, in particular from 0.001 µm to 40 µm, e.g., 0.001 to 30 µm.
- Non-limiting examples of commercially available powders (ii) for use in the instant method may have a median particle size d50 as follows:
- Mo3Si
- from about 10 µm to about 30 µm (at a purity of, e.g., from about 98 % to about 99.99 % by weight) or from about 1 µm to about 10 µm (at a purity of, e.g., from about 99 % to about 99.9 % by weight)
- Ti5Si3
- from about 10 µm to about 30 µm (at a purity of, e.g., from about 98 % to about 99.9 % by weight)
- Mo(Ti)5Si3
- from about 0.01 µm to about 50 µm (at a purity of, e.g., from about 98 % to about 99.99 % by weight) or from about 0.01 µm to about 30 µm (at a purity of, e.g., from about 99 % to about 99.9 % by weight)
- Mo(Ti)5SiB2
- from about 0.01 µm to about 50 µm (at a purity of, e.g., from about 98 % to about 99.99 % by weight) or from about 0.01 µm to about 30 µm (at a purity of, e.g., from about 99 % to about 99.9 % by weight).
- The one or more powders (iii) which may be used in combination with or instead of the one or
- more powders (ii) are readily commercially available (e.g., from H. C. Starck, Germany).
- The powders (iii) for use in the instant method will usually have a median particle size d50 (as determined by, e.g., laser diffraction) in the range from 0.001 µm to 50 µm, e.g., from 0.001 µm to 40 µm, or from 0.001 to 30 µm.
- Non-limiting examples of commercially available powders (iii) for use in the instant method may have a median particle size d50 as follows:
- Si3N4
- from about 0.1 µm to about 5 µm (at a purity of, e.g., from about 95 % to about 99.9 % by weight) or from about 0.5 µm to about 1 µm (at a purity of, e.g., from about 98 % to about 99.9 % by weight)
- BN
- from about 0.1 µm to about 5 µm (at a purity of, e.g., from about 95 % to about 99.9 % by weight) or from about 0.5 µm to about 1 µm (at a purity of, e.g., from about 98 % to about 99.9 % by weight)
- The powders (i) and/or (i') and the powders (ii) and/or (iii) are mixed and optionally milled, and then subjected to a sintering process (either pressureless or under pressure in a reducing or inert gas atmosphere, e.g., an atmosphere consisting essentially of Ar/H2 or helium). Corresponding processes are well known to those of skill in the art. Prior to sintering the mixed (and optionally milled) powders will usually be combined with a preferably organic binder (e.g., an organic wax) and then subjected to cold isostatic pressing (CIP) at room temperature, e.g., at a pressure of from 100 to 300 MPa for, e.g., 5 to 60 minutes, to form a green body.
- The one or more powders (i) or (i') are usually mixed with the one or more powders (ii) and/or (iii) in ratios which result in a weight percentage of the one or more powders (i) and/or the one or more powders (i') of at least 85 %, e.g., at least 88 %, at least 90 %, at least 92 %, or at least 94 % by weight, but usually not higher than 97 %, e.g., not higher than 96 % by weight, based on the total weight of the powder mixture (i.e., without optional binder). Merely by way of example, weight percentages of powders (i) and (iii) in a corresponding mixture may be as follows:
- Powder (i)
- from 85 to 97, preferably from 92 to 96
- Si3N4
- from 2 to 15, preferably from 3 to 7
- BN
- from 0.5 to 5, preferably from 1 to 3.
- The sintering (or reaction sintering if nitrides are present) is usually carried out in several (e.g., two, three or four) steps at different temperatures. Merely by way of example, the sintering may be carried out, in each case with a holding time of from 1 to 3 hours, (1) at a temperature of from 350°C to 450°C (e.g., at about 400°C) to decompose the optionally present organic binder, (2) at a temperature of from 650°C to 750°C (e.g., at about 700°C) to decompose nitrides, if present, (3) at a temperature of from 1,150°C to 1,250°C (e.g., at about 1,200°C) and (4) at a temperature of from 1,650°C to 1,750°C (e.g., at about 1,700°C).
- The sintered body thus obtained may optionally be subjected to hot isostatic pressing (HIP), e.g., at a temperature of from 1,300°C to 1,500°C and at a pressure of from 100 to 300 MPa for 5 to 10 hours. Prior to and/or after the HIP a heat treatment may be carried out, e.g., at a temperature of from 1,300°C to 1,600°C for 5 to 50 hours.
- The sintered body may also be subjected to forming (optionally preceded by HIP and/or heat treatment(s) as set forth above) such as, e.g., rolling, extrusion, forging (e.g., isothermal or "hot die"), optionally followed by a heat treatment as set forth above.
- It should also be noted that in the case of the absence of nitrides in the powder mixture the sintering (and the CIP) can be replaced by a generative production method, e.g. by using a laser with which a desired structure is built up layer by layer, the laser being used to sinter each deposited layer of powder material before the next layer of powder material is deposited.
- The following embodiments of the instant method are provided for purely illustrative purposes.
- A powder (i) was prepared by arc melting of a powder mixture of elemental Mo (81 % by weight), Ti (18 % by weight) and Fe (1 % by weight) to form an ingot, followed by atomization of the ingot by means of a Laval nozzle. The powder (i) (93 % by weight based on powder mixture) was then mixed with powders (iii) of Si3N4 (5 % by weight) and BN (2 % by weight) in a planetary ball mill (mass ratio balls : powder = 10 : 1, 100 rev/min) for 15 minutes and the resultant mixture was combined with an organic binder (e.g., wax) and then subjected to CIP for about 10 minutes at about 300 MPa and thereafter to reaction sintering at about 400°C for about 1 hour in an Ar/H2 atmosphere, about 700°C for about 1 hour in an Ar/H2 atmosphere, about 1,200°C for about 1 hour in vacuum and about 1,700°C for about 1 hour in vacuum, followed by a heat treatment at about 1,400°C for about 10 hours and HIP for about 5 hours at about 1,400°C and about 150 MPa. The resultant product showed the following (approximate) concentrations (in at.%):
Mo 57 Ti 25 Fe 1 Si 9 B 8 - A powder (i) is prepared by plasma melting of a powder mixture of elemental Mo, Ti, Fe and Hf to form an ingot, followed by atomization of the ingot by means of a Laval nozzle. The powder (i) is then mixed with powders (iii) of Si3N4 and BN and an organic binder and the resultant mixture is subjected to CIP and thereafter to reaction sintering at temperatures of about 400°C, about 700°C, about 1,200°C and about 1,700°C, each for about 1-3 hours in a reducing atmosphere or in vacuum, followed by a heat treatment at about 1,400°C for about 10 hours and HIP for about 5 hours at about 1,400°C and about 150 MPa.
- A powder (i) is prepared by arc melting or plasma melting of a powder mixture of elemental Mo, Ti, Fe, Y, Hf, Nb, Zr and W to form an ingot, followed by an optional heat treatment, optional HIP and atomization of the ingot by means of a Laval nozzle or by means of an EIGA method. The powder (i) is then mixed with powders (iii) of Si3N4 and BN and an organic binder and the resultant mixture is subjected to CIP and thereafter to reaction sintering at temperatures of about 400°C, about 700°C, about 1,200°C and about 1,700°C, each for about 1-3 hours in a reducing atmosphere or in vacuum, followed by optional HIP for about 5 to about 10 hours at a temperature of from about 1,300°C to about 1,500°C and a pressure of from about 100 to about 300 MPa, forming by rolling, extrusion or forging at a temperature of higher than 1,600°C and a subsequent heat treatment for about 5 to about 50 hours at a temperature of from about 1,300°C to about 1,600°C.
- A powder (i) is prepared by plasma melting of a powder mixture of elemental Mo, Ti and Fe to form an ingot, followed by atomization of the ingot by means of a Laval nozzle. The powder (i) is then mixed with powders (ii) of Mo(Ti)5Si3 and Mo(Ti)5SiB2 and an organic binder and the resultant mixture is subjected to CIP and thereafter to sintering at temperatures of about 400°C, about 1,200°C and about 1,700°C, each for about 1-3 hours in a reducing atmosphere or in vacuum, followed by a heat treatment at about 1,400°C for about 10 hours and HIP for about 5 hours at about 1,400°C and about 150 MPa.
- A powder mixture (i') of elemental Mo and of TiN is mixed with powders (iii) of Si3N4 and BN and an organic binder and the resultant mixture is subjected to CIP and thereafter to reaction sintering at temperatures of about 400°C, about 700°C, about 1,200°C and about 1,700°C, each for about 1-3 hours in a reducing atmosphere or in vacuum, followed by a heat treatment at about 1,400°C for about 10 hours and HIP for about 5 hours at about 1,400°C and about 150 MPa.
- As set forth above, the method of the present invention is suitable for making molybdenum alloys which have a high titanium content. The term "molybdenum alloy" as used herein and in the appended claims refers to an alloy in which the element molybdenum makes up the greatest alloying fraction in at.%. In other words, in a molybdenum alloy, there is no other element which has a greater alloying fraction in at.% than Mo. The molybdenum content of the alloy in at.% will usually be at least 30 at.%, preferably at least 35 at.%, and in particular at least 40 at.%, e.g., at least 45 at.% (based on all elements present in the alloy, as in the following).
- "High titanium content" as used herein and in the appended claims refers to a titanium content of at least 15 at.%, preferably at least 20 at.% and particularly at least 25 at.%, e.g., at least 30 at. %.
- In one aspect, the alloy made by the instant method may further comprise iron and/or yttrium, each in a concentration of from 0.1 to 5 at.%, in particular in a concentration of from 0.3 to 3 at.%. For example, iron may be present in a concentration of from 0.5 to 3 at.%, in particular from 0.8 to 2 at.%, and/or yttrium may be present in a concentration of from 0.3 to 3 at.%, in particular from 0.5 to 2 at.%.
- The alloy produced by the method of the present invention may further comprise one or more of zirconium, niobium, hafnium, and tungsten. For example, zirconium may be present in a concentration of not more than 5 at.%, in particular in a concentration of from 0.3 to 3 at.%, and/or niobium may be present in a concentration of not more than 20 at.%, in particular in a concentration of from 0.3 to 10 at.%, and/or tungsten may be present in a concentration of not more than 8 at.%, in particular in a concentration of from 0.3 to 5 at.% and/or hafnium may be present in a concentration of not more than 5 at.%, in particular in a concentration of from 0.3 to 3 at.%.
- The alloy of the present invention may comprise silicon in a concentration of from 9 to 15 at.%, in particular in a concentration of from 12 to 14 at.%, and/or boron in a concentration of from 5 to 9 at.%, in particular in a concentration of from 5 to 6 at.%, and/or titanium in a concentration of from 25 to 33 at.%, in particular in a concentration of from 26 to 29 at.%.
- The alloy may, for example, be formed exclusively of molybdenum, silicon, boron, titanium, iron, yttrium, niobium, tungsten, zirconium, hafnium (and unavoidable impurities), or may be formed exclusively of molybdenum, silicon, boron, titanium, iron, yttrium (or hafnium).
- In another aspect of the alloy, molybdenum may be present in a concentration of from 35 to 66 at.%, in particular in a concentration of from 40 to 60 at.%, e.g., from 45 to 57 at.%, or in a concentration such that the alloy comprises 100 at.% together with the remaining alloying constituents mentioned.
- In another aspect, the true density of the produced alloy may be less than or equal to 9 g/cm3, in particular less than or equal to 8.5 g/cm3, or less than or equal to 8 g/cm3.
- In yet another aspect, the structure of the alloy may comprise a matrix of a molybdenum mixed crystal and silicide phases, the silicide phases being formed in particular by Mo(Ti)5Si3 and/or Mo(Ti)5SiB2. For example, the alloy may comprise from 15 to 35 vol.%, in particular from 25 to 35 vol.% Mo(Ti)5Si3 and from 15 to 35 vol.%, in particular from 15 to 25 vol.% Mo(Ti)5SiB2 and from 1 to 20 vol.% minor phases. Also by way of example, the alloy may comprise from 45 to 55 vol.%, in particular from 48 to 55 vol.%, molybdenum mixed crystal or a fraction of molybdenum mixed crystal such that the alloy together with the remaining phase constituents comprises 100 vol.%.
- As minor alloying constituents, one or both of niobium and tungsten may additionally be present in the alloy. The addition of niobium improves the fracture toughness and therefore the deformability or ductility, whereas tungsten improves the oxidation resistance of the alloy. Preferably, the alloy is formed exclusively of the elements molybdenum, silicon, boron, titanium, iron, yttrium, niobium, tungsten, hafnium and zirconium, wherein the fraction of niobium, tungsten, hafnium and zirconium may be 0 at.%. As is known to those skilled in the art, an alloy can comprise further elements as unavoidable impurities, wherein, however, none of these further elements should make up more than 1 at.%, preferably more than 0.1 at.%, in the alloy.
- With the main and minor alloying elements, therefore, alloys can be produced by the method of the present invention which, in addition to unavoidable impurities, exclusively comprise Mo, Si, B, Ti, Fe, Y, Zr, Nb, Hf and/or W. In particular, Mo-Si-B-Ti-Fe-, Mo-Si-B-Ti-Fe-Zr-, Mo-Si-B-Ti-Fe-Y-, Mo-Si-B-Ti-Fe-Y-Nb- and Mo-Si-B-Ti-Fe-Y-Nb-W alloys can be produced, likewise a Mo-Si-B-Ti-Y alloy which does not comprise iron, although an alloy containing iron is preferred in principle.
- The alloy composition can in particular also be selected in such a manner that the true density, that is to say the density without any pores or cavities, is adjusted to be less than or equal to 9 g/cm3, in particular less than or equal to 8.5 g/cm3, preferably less than or equal to 8 g/cm3.
- The corresponding structure of the alloy can be adjusted in such a manner that the structure has a matrix of molybdenum mixed crystal (e.g., molybdenum-titanium mixed crystal), into which the silicide phases are incorporated, wherein the silicide phases can be formed by Mo(Ti)5Si3 and/or Mo(Ti)5SiB2. In the respective silicides, therefore, molybdenum can be replaced by titanium and vice versa.
- The molybdenum alloy made by the method of the present invention may comprise from 15 to 35 vol.%, e.g., from 25 to 35 vol.% Mo(Ti)5Si3 and from 15 to 35 vol.%, e.g., from 15 to 25 vol.% Mo(Ti)5SiB2 and from 1 to 20 vol.%, e.g., from 1 to 5 vol.%, minor phases. Minor phases can comprise various phases, in particular various mixed phases or mixed crystals of the alloying elements present in the alloy.
- The molybdenum alloy may additionally comprise from 45 to 55 vol.%, in particular from 48 to 55 vol.%, molybdenum mixed crystal or a fraction of molybdenum mixed crystal such that the alloy together with the remaining phase constituents comprises 100 vol.%.
- With a corresponding molybdenum alloy, in particular components of turbomachines, preferably of gas turbines or aero engines can be manufactured, wherein the components can be, in particular, rotor blades or guide vanes of the turbomachine, and in particular guide vanes or rotor vanes of rapidly running uncooled low-pressure turbines.
- Advantageous properties having a balanced property profile with respect to creep resistance, static strength, fracture toughness, ductility, oxidation resistance and low specific gravity have been achieved with the following exemplary alloy compositions (figures in each case in at.%), which can also comprise small amounts of further elements as unavoidable impurities:
Mo Si B Ti Fe Y Zr Nb W Hf 49.5 12.5 8.5 27.5 2.0 0 0 0 0 0 48.5 13.5 8.5 26.5 2.0 0 1.0 0 0 0 51.0 10.0 8.5 27.5 2.0 0 1.0 0 0 0 46.5 12.5 8.5 27.5 2.0 2.0 1.0 0 0 0 46.5 12.5 8.5 27.5 2.0 2.0 0 1.0 0 0 46.5 12.5 8.5 27.5 2.0 2.0 0 0 1.0 0 49.3 13.5 5.5 27.5 1.2 0 0 0 1.0 0 50.5 13.5 5.5 27.5 2.0 0 0 0 0 1.0 53.0 13.5 5.5 27.0 1.0 0 0 0 0 0 51.0 13.5 5.5 27.0 1.0 0 0 0 0 2.0 46.0 13.5 5.5 27.0 1.0 0 0 5.0 0 2.0 - Although the present invention has been described herein with reference to particular means, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.
Claims (15)
- Method of making a molybdenum alloy having a high titanium content and further comprising one or both of silicon and boron, characterized in that the method comprises subjecting to pressureless sintering or sintering under pressure a mixture of powders which comprise (i) one or more powders of an alloy of Mo and Ti and, optionally, one or more additional metals X and/or (i') powders of Mo and of titanium nitride, and at least one of (ii) one or more powders comprising one or more powders of silicides of Mo and/or Ti and (iii) one or more powders of nitrides which comprise at least silicon nitride and/or boron nitride.
- Method according to claim 1, characterized in that X is present and selected from one or more of Fe, Y, Hf, Nb, Zr, W and in particular comprises at least Fe.
- Method according to any one of claims 1 and 2, characterized in that one or more powders (i) are employed.
- Method according to claim 3, characterized in that the one or more powders (i) have a median particle size d50 of from 0.001 µm to 50 µm and/or the particles of (i) are substantially spherical.
- Method according to any one of the preceding claims, characterized in that one or more powders (ii) are employed.
- Method according to claim 5, characterized in that the one or more powders (ii) comprise powders of MoTi5Si3, Ti5Si3, MoTi5SiB2, Mo3Si or a combination of two or more thereof.
- Method according to any one of the preceding claims, characterized in that one or more powders (iii) are employed.
- Method according to claim 7, characterized in that the one or more powders (iii) comprise at least silicon nitride powder.
- Method according to any one of the preceding claims, characterized in that one or more powders (i') are employed.
- Method according to claim 9, characterized in that the one or more powders (i') have a median particle size d50 of from 0.001 µm to 50 µm.
- Method according to any one of the preceding claims, characterized in that the powders (i) and/or (i') and the powders (ii) and/or (iii) are combined in ratios which result in an alloy which comprises at least 35 at.% of molybdenum and preferably not more than 66 at.% of molybdenum.
- Method according to any one of the preceding claims, characterized in that the powders (i) and/or (i') and the powders (ii) and/or (iii) are combined in ratios which result in an alloy which comprises at least 25 at.% of titanium and preferably not more than 33 at.% of titanium.
- Method according to any one of the preceding claims, characterized in that the powders (i) and/or (i') and the powders (ii) and/or (iii) are combined in ratios which result in an alloy which comprises at least 9 at.% of silicon and preferably not more than 15 at.% of silicon.
- Alloy which is obtainable by the method according to any one of claims 1 to 13.
- Article which is made of or comprises the alloy according to claim 14.
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EP16193634.9A EP3309266A1 (en) | 2016-10-13 | 2016-10-13 | Method of making a molybdenum alloy having a high titanium content |
US15/782,974 US20180105901A1 (en) | 2016-10-13 | 2017-10-13 | Method of making a molybdenum alloy having a high titanium content |
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US11761064B2 (en) * | 2020-12-18 | 2023-09-19 | Rtx Corporation | Refractory metal alloy |
CN114990499B (en) * | 2021-07-19 | 2023-06-20 | 江苏钢研昊普科技有限公司 | Preparation method of molybdenum alloy target |
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