JP2014034720A - Ni基単結晶超合金 - Google Patents
Ni基単結晶超合金 Download PDFInfo
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- JP2014034720A JP2014034720A JP2012177573A JP2012177573A JP2014034720A JP 2014034720 A JP2014034720 A JP 2014034720A JP 2012177573 A JP2012177573 A JP 2012177573A JP 2012177573 A JP2012177573 A JP 2012177573A JP 2014034720 A JP2014034720 A JP 2014034720A
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- 239000013078 crystal Substances 0.000 title claims abstract description 68
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 59
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 5
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 38
- 239000011651 chromium Substances 0.000 claims description 19
- 239000010955 niobium Substances 0.000 claims description 17
- 239000010936 titanium Substances 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910017052 cobalt Inorganic materials 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052735 hafnium Inorganic materials 0.000 abstract description 6
- 229910052726 zirconium Inorganic materials 0.000 abstract description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 5
- 238000005050 thermomechanical fatigue Methods 0.000 description 30
- 238000011282 treatment Methods 0.000 description 27
- 230000032683 aging Effects 0.000 description 16
- 230000003647 oxidation Effects 0.000 description 16
- 238000007254 oxidation reaction Methods 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 14
- 238000001816 cooling Methods 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- 238000005266 casting Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004881 precipitation hardening Methods 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000611 regression analysis Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/52—Alloys
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
- C30B33/02—Heat treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/13—Refractory metals, i.e. Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
- F05D2300/132—Chromium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
- F05D2300/175—Superalloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/607—Monocrystallinity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Abstract
【解決手段】 Cr:6質量%以上12質量%以下、
Mo:0.4質量%以上3.0質量%以下、
W:6質量%以上10質量%以下、
Al:4.0質量%以上6.5質量%以下、
Nb:0質量%以上1質量%以下、
Ta:8質量%以上12質量%以下、
Hf:0質量%以上0.15質量%以下、
Si:0.01質量%以上0.2質量%以下、および
Zr:0質量%以上0.04質量%以下、
を含有し、
B、C、Y、La、CeまたはVの少なくとも一つの元素の含有が許容され、
残部がNiおよび不可避的不純物からなる。
【選択図】図1
Description
Cr:6質量%以上12質量%以下、
Mo:0.4質量%以上3.0質量%以下、
W:6質量%以上10質量%以下、
Al:4.0質量%以上6.5質量%以下、
Nb:0質量%以上1質量%以下、
Ta:8質量%以上12質量%以下、
Hf:0質量%以上0.15質量%以下、
Si:0.01質量%以上0.2質量%以下、および
Zr:0質量%以上0.04質量%以下、
を含有し、
B、C、Y、La、CeまたはVの少なくとも一つの元素の含有が許容され、
残部がNiおよび不可避的不純物からなることを特徴としている。
Cr:7質量%以上12質量%以下、
Mo:0.4質量%以上2.5質量%以下、
W:7質量%以上10質量%以下、
Al:4.0質量%以上6.5質量%以下、
Nb:0質量%以上1質量%以下、
Ta:9質量%以上11質量%以下、
Hf:0質量%以上0.15質量%以下、
Si:0.01質量%以上0.2質量%以下、および
Zr:0質量%以上0.04質量%以下、
を含有し、
B、C、Y、La、CeまたはVの少なくとも一つの元素の含有が許容され、
残部がNiおよび不可避的不純物からなることを特徴としている。
Cr:8質量%以上10質量%以下、
Mo:0.4質量%以上2.0質量%以下、
W:7質量%以上9質量%以下、
Al:4.0質量%以上6.5質量%以下、
Nb:0質量%以上1質量%以下、
Ta:10質量%以上11質量%以下、
Hf:0質量%以上0.15質量%以下、
Si:0.01質量%以上0.2質量%以下、および
Zr:0質量%以上0.04質量%以下、
を含有し、
B、C、Y、La、CeまたはVの少なくとも一つの元素の含有が許容され、
残部がNiおよび不可避的不純物からなることを特徴としている。
含有が許容される前記元素の組成比が、
B:0.05質量%以下、
C:0.15質量%以下、
Y:0.1質量%以下、
La:0.1質量%以下、
Ce:0.1質量%以下、
V:1質量%以下、
であることが好ましい。
τ(h)= -3208+11XCo+40XCr+139XMo+93XW+327XAl+146XTi+45XNb+53XTa (1)
(ただし、τ(h)はクリープ寿命(時間)、XCo、XCr、XMo、XW、XAl、XTi、XNb、XTaは、それぞれ、コバルト、クロム、モリブデン、タングステン、アルミニウム、チタン、ニオブ、タンタルの組成比(質量%))を示す)
で示されるとき、τ(h)≧120であることが好ましい。
B:0.05質量%以下、
C:0.15質量%以下、
Y:0.1質量%以下、
La:0.1質量%以下、
Ce:0.1質量%以下、
V:1質量%以下、
であることが好ましい。
τ(h)= -3208+11XCo+40XCr+139XMo+93XW+327XAl+146XTi+45XNb+53XTa (1)
(ただし、τ(h)はクリープ寿命(時間)、XCo、XCr、XMo、XW、XAl、XTi、XNb、XTaは、それぞれ、コバルト、クロム、モリブデン、タングステン、アルミニウム、チタン、ニオブ、タンタルの組成比(質量%))を示す)
で示されるとき、τ(h)≧120であることが好ましく、τ(h)≧200であることがより好ましい。上記式(1)は、Ni基単結晶超合金のクリープ寿命を規定するパラメータであり、Reを含有しない既存のNi基超合金について、その組成と、900℃で392MPaの条件下でのクリープ寿命との関係を重回帰分析して新たに導出したものである。式(1)により予測されるクリープ寿命の予測値は、Reを含有しないNi基超合金の900℃で392MPaにおけるクリープ寿命の実測値とよく一致している。
1280℃〜1360℃に2時間〜40時間保持する溶体化処理→200℃/min〜400℃/minでの空冷または不活性ガス雰囲気中での冷却→1000℃〜1200℃で2時間〜5時間保持後に空冷または不活性ガス雰囲気中で冷却する1次時効処理→850℃〜950℃で10時間〜30時間保持後に空冷または不活性ガス雰囲気中で冷却する2次時効処理
という一連のものである。
Claims (6)
- Cr:6質量%以上12質量%以下、
Mo:0.4質量%以上3.0質量%以下、
W:6質量%以上10質量%以下、
Al:4.0質量%以上6.5質量%以下、
Nb:0質量%以上1質量%以下、
Ta:8質量%以上12質量%以下、
Hf:0質量%以上0.15質量%以下、
Si:0.01質量%以上0.2質量%以下、および
Zr:0質量%以上0.04質量%以下、
を含有し、
B、C、Y、La、CeまたはVの少なくとも一つの元素の含有が許容され、
残部がNiおよび不可避的不純物からなることを特徴とするNi基単結晶超合金。 - Cr:7質量%以上12質量%以下、
Mo:0.4質量%以上2.5質量%以下、
W:7質量%以上10質量%以下、
Al:4.0質量%以上6.5質量%以下、
Nb:0質量%以上1質量%以下、
Ta:9質量%以上11質量%以下、
Hf:0質量%以上0.15質量%以下、
Si:0.01質量%以上0.2質量%以下、および
Zr:0質量%以上0.04質量%以下、
を含有し、
B、C、Y、La、CeまたはVの少なくとも一つの元素の含有が許容され、
残部がNiおよび不可避的不純物からなることを特徴とするNi基単結晶超合金。 - Cr:8質量%以上10質量%以下、
Mo:0.4質量%以上2.0質量%以下、
W:7質量%以上9質量%以下、
Al:4.0質量%以上6.5質量%以下、
Nb:0質量%以上1質量%以下、
Ta:10質量%以上11質量%以下、
Hf:0質量%以上0.15質量%以下、
Si:0.01質量%以上0.2質量%以下、および
Zr:0質量%以上0.04質量%以下、
を含有し、
B、C、Y、La、CeまたはVの少なくとも一つの元素の含有が許容され、
残部がNiおよび不可避的不純物からなることを特徴とするNi基単結晶超合金。 - 含有が許容される前記元素の組成比が、
B:0.05質量%以下、
C:0.15質量%以下、
Y:0.1質量%以下、
La:0.1質量%以下、
Ce:0.1質量%以下、
V:1質量%以下、
であることを特徴とする請求項1から3のいずれか一項に記載のNi基単結晶超合金。 - クリープ寿命τ(h)が、
τ(h)= -3208+11XCo+40XCr+139XMo+93XW+327XAl+146XTi+45XNb+53XTa (1)
(ただし、τ(h)はクリープ寿命(時間)、XCo、XCr、XMo、XW、XAl、XTi、XNb、XTaは、それぞれ、コバルト、クロム、モリブデン、タングステン、アルミニウム、チタン、ニオブ、タンタルの組成比(質量%))を示す)
で示されるとき、τ(h)≧120であることを特徴とする請求項1から4のいずれか一項に記載のNi基単結晶超合金。 - 前記クリープ寿命τ(h)が200以上であることを特徴とする請求項5に記載のNi基単結晶超合金。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2012177573A JP6016016B2 (ja) | 2012-08-09 | 2012-08-09 | Ni基単結晶超合金 |
KR1020157002347A KR101687320B1 (ko) | 2012-08-09 | 2013-07-30 | Ni기 단결정 초합금 |
DE112013003971.0T DE112013003971T5 (de) | 2012-08-09 | 2013-07-30 | Nickelbasierte einkristalline Superlegierung |
US14/419,765 US9816161B2 (en) | 2012-08-09 | 2013-07-30 | Ni-based single crystal superalloy |
PCT/JP2013/070613 WO2014024734A1 (ja) | 2012-08-09 | 2013-07-30 | Ni基単結晶超合金 |
CN201380041423.1A CN104520457B (zh) | 2012-08-09 | 2013-07-30 | Ni基单晶超合金 |
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JP2012177573A JP6016016B2 (ja) | 2012-08-09 | 2012-08-09 | Ni基単結晶超合金 |
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JP2014034720A true JP2014034720A (ja) | 2014-02-24 |
JP6016016B2 JP6016016B2 (ja) | 2016-10-26 |
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US (1) | US9816161B2 (ja) |
JP (1) | JP6016016B2 (ja) |
KR (1) | KR101687320B1 (ja) |
CN (1) | CN104520457B (ja) |
DE (1) | DE112013003971T5 (ja) |
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US9816161B2 (en) | 2017-11-14 |
JP6016016B2 (ja) | 2016-10-26 |
KR101687320B1 (ko) | 2016-12-16 |
CN104520457A (zh) | 2015-04-15 |
KR20150044879A (ko) | 2015-04-27 |
CN104520457B (zh) | 2017-03-15 |
US20150197833A1 (en) | 2015-07-16 |
DE112013003971T5 (de) | 2015-06-25 |
WO2014024734A1 (ja) | 2014-02-13 |
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