JP7133641B2 - 3次元印刷 - Google Patents
3次元印刷 Download PDFInfo
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- JP7133641B2 JP7133641B2 JP2020555870A JP2020555870A JP7133641B2 JP 7133641 B2 JP7133641 B2 JP 7133641B2 JP 2020555870 A JP2020555870 A JP 2020555870A JP 2020555870 A JP2020555870 A JP 2020555870A JP 7133641 B2 JP7133641 B2 JP 7133641B2
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- JP
- Japan
- Prior art keywords
- weight
- adhesion promoter
- build material
- dihydrazide
- binder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000010146 3D printing Methods 0.000 title claims description 50
- 239000002245 particle Substances 0.000 claims description 145
- 239000007788 liquid Substances 0.000 claims description 129
- 239000002318 adhesion promoter Substances 0.000 claims description 124
- 239000011230 binding agent Substances 0.000 claims description 116
- 239000000463 material Substances 0.000 claims description 116
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- 238000000034 method Methods 0.000 claims description 46
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- 239000002923 metal particle Substances 0.000 claims description 27
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- 238000010438 heat treatment Methods 0.000 claims description 23
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 20
- 238000009826 distribution Methods 0.000 claims description 20
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- 229940042795 hydrazides for tuberculosis treatment Drugs 0.000 claims description 11
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- SWRGUMCEJHQWEE-UHFFFAOYSA-N ethanedihydrazide Chemical compound NNC(=O)C(=O)NN SWRGUMCEJHQWEE-UHFFFAOYSA-N 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- IBVAQQYNSHJXBV-UHFFFAOYSA-N adipic acid dihydrazide Chemical compound NNC(=O)CCCCC(=O)NN IBVAQQYNSHJXBV-UHFFFAOYSA-N 0.000 claims description 6
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- XEVRDFDBXJMZFG-UHFFFAOYSA-N carbonyl dihydrazine Chemical compound NNC(=O)NN XEVRDFDBXJMZFG-UHFFFAOYSA-N 0.000 claims description 6
- ALHNLFMSAXZKRC-UHFFFAOYSA-N benzene-1,4-dicarbohydrazide Chemical compound NNC(=O)C1=CC=C(C(=O)NN)C=C1 ALHNLFMSAXZKRC-UHFFFAOYSA-N 0.000 claims description 5
- HCOMFAYPHBFMKU-UHFFFAOYSA-N butanedihydrazide Chemical compound NNC(=O)CCC(=O)NN HCOMFAYPHBFMKU-UHFFFAOYSA-N 0.000 claims description 5
- ZWLIYXJBOIDXLL-UHFFFAOYSA-N decanedihydrazide Chemical compound NNC(=O)CCCCCCCCC(=O)NN ZWLIYXJBOIDXLL-UHFFFAOYSA-N 0.000 claims description 5
- GRGBENNNGZARRZ-UHFFFAOYSA-N dodecanedihydrazide Chemical compound NNC(=O)CCCCCCCCCCC(=O)NN GRGBENNNGZARRZ-UHFFFAOYSA-N 0.000 claims description 5
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- 125000003118 aryl group Chemical group 0.000 claims description 4
- YBDQLHBVNXARAU-UHFFFAOYSA-N 2-methyloxane Chemical compound CC1CCCCO1 YBDQLHBVNXARAU-UHFFFAOYSA-N 0.000 claims description 3
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- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
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- QSBINWBNXWAVAK-PSXMRANNSA-N PE-NMe(16:0/16:0) Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP(O)(=O)OCCNC)OC(=O)CCCCCCCCCCCCCCC QSBINWBNXWAVAK-PSXMRANNSA-N 0.000 claims description 3
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- 229910052804 chromium Inorganic materials 0.000 claims description 3
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- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
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- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
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- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 3
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- 239000004566 building material Substances 0.000 claims 2
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- 238000000137 annealing Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- NECRQCBKTGZNMH-UHFFFAOYSA-N 3,5-dimethylhex-1-yn-3-ol Chemical compound CC(C)CC(C)(O)C#C NECRQCBKTGZNMH-UHFFFAOYSA-N 0.000 description 3
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- RUPBZQFQVRMKDG-UHFFFAOYSA-M Didecyldimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCC[N+](C)(C)CCCCCCCCCC RUPBZQFQVRMKDG-UHFFFAOYSA-M 0.000 description 3
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- WBYWAXJHAXSJNI-UHFFFAOYSA-N methyl p-hydroxycinnamate Natural products OC(=O)C=CC1=CC=CC=C1 WBYWAXJHAXSJNI-UHFFFAOYSA-N 0.000 description 3
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- 239000001124 (E)-prop-1-ene-1,2,3-tricarboxylic acid Substances 0.000 description 2
- JDSQBDGCMUXRBM-UHFFFAOYSA-N 2-[2-(2-butoxypropoxy)propoxy]propan-1-ol Chemical compound CCCCOC(C)COC(C)COC(C)CO JDSQBDGCMUXRBM-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
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- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
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- B22F10/14—Formation of a green body by jetting of binder onto a bed of metal powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B33Y70/00—Materials specially adapted for additive manufacturing
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- B22F10/60—Treatment of workpieces or articles after build-up
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- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/10—Auxiliary heating means
- B22F12/13—Auxiliary heating means to preheat the material
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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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- B22F2304/00—Physical aspects of the powder
- B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
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- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
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- B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
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- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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Description
を有することができ、式中Rは不存在、C1からC8の非分岐アルキル、C3からC8の分岐アルキル、C2からC8の非分岐アルキレン、C4からC8の分岐アルキレン、芳香族基、脂環基、またはこれらの組み合わせであり;AはC=O、O=S=O、またはP=Oであり;そしてnは2または3であり;ここでRが不存在のとき、nは2であって2つのヒドラジドが共通のA部分を共有するか、または2つのヒドラジドが介在するR基なしにそれぞれのA部分で相互に連結される。例えば、マルチヒドラジド接着促進剤は、アジピン酸ジヒドラジド、カルボジヒドラジド、シュウ酸ジヒドラジド、コハク酸ジヒドラジド、イソフタル酸ジヒドラジド、アゼライン酸ジヒドラジド、ドデカン二酸ジヒドラジド、セバシン酸ジヒドラジド、テレフタル酸ジヒドラジド、オキシビスベンゼンスルホニルヒドラジド、またはこれらの組み合わせから選択することができる。
を有することができ、式中Rは不存在、C1からC8の非分岐アルキル、C3からC8の分岐アルキル、C2からC8の非分岐アルキレン、C4からC8の分岐アルキレン、芳香族基、脂環基、またはこれらの組み合わせであり;AはC=O、O=S=O、またはP=Oであり;そしてnは2または3であり;ここでRが不存在のとき、nは2であって2つのヒドラジドが共通のA部分を共有するか、または2つのヒドラジドが介在するR基なしにそれぞれのA部分で相互に連結される。
さらに詳細には、図1に示すように、3D印刷キット100は、粒状造形材料の合計重量に基づいて約80重量%から100重量%の金属粒子を含有する粒状造形材料110;並びに水、およびバインダー液の合計重量に基づいて約10重量%から約25重量%の量のラテックス粒子を含有するバインダー液120を含むことができる。ひとつの例において、バインダー液はまた、バインダー液の合計重量に基づいて約0.05重量%から約3重量%の量のマルチヒドラジド接着促進剤を含むことができる。別の例において、3D印刷キットは、マルチヒドラジド接着促進剤を別個の液体中に、すなわち接着促進剤液130中に含むことができ、これは水、および接着促進剤液の合計重量に基づいて約0.1重量%から約5重量%の量のマルチヒドラジド接着促進剤を含有する。かくして3D印刷キットは粒状造形材料を含み、そして印刷キットはさらに、ラテックス粒子およびマルチヒドラジド接着促進剤を粒状造形材料に施与する1つまたは2つの流体を、単一の流体または複数の流体の組み合わせでもって含んでいる。注意点として、接着促進剤液が別個にある例の場合には、マルチヒドラジド接着促進剤は両方の流体中にあるか、または単に接着促進剤液中にあることができる。
以下は本開示の実施例を例示している。しかしながら、以下は本開示の原理の適用について例示したものであることが理解されよう。本開示の思想および範囲から逸脱することなしに、数多くの修正および代替的な組成物、方法、およびシステムが想到されてよい。添付の特許請求の範囲は、そうした修正および編成を包含することを意図している。
種々のマルチヒドラジドを含むバインダー液およびマルチヒドラジドを含まないバインダー液(対照として)の引張強度を評価するために、以下のバインダー液配合物を表2に従って調製した:
引張強度試験は図5に示すようにして行ったが、そこでは表2に従って調製されたバインダー液を使用して、本質的に図2および図3に示すような固化したグリーン体試料である、プレスバー試料124が調製された。個々のプレスバー試料は、表2の種々のバインダー液と混合された、約22μmのD50粒径を有するステンレス鋼100重量%の粒状造形材料を含んでいた。引張強度試験用に個々の試料を調製するために、ステンレス鋼粒子および種々のバインダー液の混合物を高速ミキサー中で混合して、約19:1の重量比(94.8重量%のステンレス鋼粒子;5.2重量%のバインダー液)で均一に混合し、次いで湿った粒子/バインダーの均一混合物を真空オーブン中で40℃において2時間乾燥して、水含有量の殆どを除去し、バインダー固形分とステンレス鋼粒子の乾燥した均一混合物を残した。18gの乾燥均一混合物をプレスバー金型の開口中に注入し、1000psiで30秒間にわたって圧縮して、個別のプレスバー試料を形成した。図5において124で示すプレスバー試料の寸法は、50mm(長さ)掛ける12mm(幅)掛ける5.5mm(厚さ)であった。個々のプレスバー試料は次いで金型から注意深く分離し、真空オーブン中で180℃において、Hg22-25で30分間にわたり、溶媒を除去し、またラテックスバインダーの幾らかまたは全部をも硬化するために空気をゆっくりと流しながら硬化した。個別の硬化したプレスバー試料は次いで冷却され、例示的に図5に示すようなInstron登録商標3点曲げ試験機に提出されて、それらの引張強度が測定された。インストロン社(米国)から入手可能なInstron登録商標試験機は、支持体150、支持ピン152、および個々のプレスバー試料が不首尾となる(力を受けて破損する)まで、それらに対して増大する力(F)を加える荷重ピン154を含んでいる。種々のプレスバー試料の個々について、少なくとも5個のプレスバーを作成し、平均最大引張応力(mPa)および標準偏差を記録した。この試験の平均データを表3に提示し、そしてこの試験の平均データおよび標準偏差のデータを図6に提示する。
表2のバインダー液のIDは、表3のプレスバー試料のIDと数字が対応しており、例えばマルチヒドラジド接着促進剤を含まないB0はプレスバー試料PB0を形成するために使用され、0.23%のADHを含むB1はプレスバー試料PB1を調製するために使用され、0.45重量%のODHを含むB5はプレスバー試料PB5を調製するために使用され、等々であった。さらにまた、表3に示された重量パーセントはバインダー液中の含有量に基づいており、最終的なプレスバー試料中に存在する含有量ではない。
実施例2中の上記表3の対照バインダー液(B0)は、後で高温オーブン中で焼結するための3Dグリーン体オブジェクトを調製するために、バインダー液として使用可能である。しかしながら、本開示の例によれば、液中にマルチヒドラジド接着促進剤が存在しなくても、上記したような22μmのステンレス鋼粒子、例えば粉体のような、粒状造形材料の種々の層上へと別個に印刷を行うために、別個の接着促進剤液を配合することが可能である。例示的なバインダー液および接着促進剤液を実例として以下の表4に提示するが、これらは表3の対照のバインダー液(B0)に対して約1:1の重量比で印刷することができる。他の重量比で印刷するために他の配合物を調製することが可能であり、従って以下の配合物は単に例示として提示されたものである。
Claims (15)
- 3次元印刷キットであって:
粒状造形材料の合計重量に基づいて80重量%から100重量%の金属粒子を含有する粒状造形材料;および
水、バインダー液の合計重量に基づいて1重量%から40重量%の量のラテックス粒子、およびバインダー液の合計重量に基づいて0.05重量%から3重量%の量のマルチヒドラジド接着促進剤を含有するバインダー液を含み、
水、ラテックス粒子、およびマルチヒドラジド接着促進剤は3次元印刷において粒状造形材料の層に対して適用される、3次元印刷キット。 - 金属粒子は、アルミニウム、チタン、銅、コバルト、クロム、ニッケル、バナジウム、タングステン、炭化タングステン、タンタル、モリブデン、マグネシウム、金、銀、鉄合金、ステンレス鋼、鋼、これらの合金、またはこれらの混合物である、請求項1の3次元印刷キット。
- ラテックス粒子は、共重合したメタクリル酸メチルが50重量%またはより多く存在し、または共重合したスチレンが50重量%またはより多く存在するコポリマーを含有する、請求項1または2の3次元印刷キット。
- マルチヒドラジド接着促進剤は、アジピン酸ジヒドラジド、カルボジヒドラジド、シュウ酸ジヒドラジド、コハク酸ジヒドラジド、イソフタル酸ジヒドラジド、アゼライン酸ジヒドラジド、ドデカン二酸ジヒドラジド、セバシン酸ジヒドラジド、テレフタル酸ジヒドラジド、オキシビスベンゼンスルホニルヒドラジド、またはこれらの組み合わせから選択される、請求項1の3次元印刷キット。
- 3次元印刷キットであって:
粒状造形材料の合計重量に基づいて80重量%から100重量%の金属粒子を含有する粒状造形材料;
水、およびバインダー液の合計重量に基づいて1重量%から40重量%の量のラテックス粒子を含有するバインダー液;および
水、および接着促進剤液の合計重量に基づいて0.1重量%から5重量%の量のマルチヒドラジド接着促進剤を含有する接着促進剤液を含む、3次元印刷キット。 - 金属粒子は4μmから150μmのD50粒径分布値を有する、請求項6の3次元印刷キット。
- ラテックス粒子はスチレン(メタ)アクリレートコポリマーである、請求項6の3次元印刷キット。
- バインダー液および接着促進剤液は、粒状造形材料の層上へと5:1から1:5の重量比で吐出されるように配合される、請求項6の3次元印刷キット。
- マルチヒドラジド接着促進剤は、アジピン酸ジヒドラジド、カルボジヒドラジド、シュウ酸ジヒドラジド、コハク酸ジヒドラジド、イソフタル酸ジヒドラジド、アゼライン酸ジヒドラジド、ドデカン二酸ジヒドラジド、セバシン酸ジヒドラジド、テレフタル酸ジヒドラジド、オキシビスベンゼンスルホニルヒドラジド、またはこれらの組み合わせから選択される、請求項6の3次元印刷キット。
- 3次元印刷方法であって:
粒状造形材料の合計重量に基づいて80重量%から100重量%の金属粒子を含有する粒状造形材料の個別の造形材料層を繰り返して適用し;
3Dオブジェクトモデルに基づき、個別の造形材料層に対して、水、ラテックス粒子、およびマルチヒドラジド接着促進剤を選択的に適用して、3Dグリーン体オブジェクトの個別にパターン形成された層を画定し;そして
個別にパターン形成された層を加熱して水を追い出し、3Dグリーン体オブジェクトをさらに固化することを含む、方法。 - ラテックス粒子は、水、およびバインダー液の合計重量に基づいてラテックス粒子を1重量%から40重量%の量で含有するバインダー液を吐出することによって、選択的に適用され、マルチヒドラジド接着促進剤は、接着促進剤液をバインダー液に対して別個の流体として吐出することによって選択的に適用され、ここで接着促進剤液は、水、および接着促進剤液の合計重量に基づいて0.05重量%から5重量%の量のマルチヒドラジド接着促進剤を含有する、請求項11の方法。
- ラテックス粒子およびマルチヒドラジド接着促進剤は、水、バインダー液の合計重量に基づいて1重量%から40重量%の量のラテックス粒子、およびバインダー液の合計重量に基づいて0.05重量%から3重量%の量のマルチヒドラジド接着促進剤を含有するバインダー液を吐出することによって選択的に適用される、請求項11の方法。
- 加熱が100℃から250℃で行われる、請求項11の方法。
- 3Dグリーン体オブジェクトを粒状造形材料から分離し、そして3Dグリーン体オブジェクトの金属粒子を融合オーブンで焼結することをさらに含む、請求項14の方法。
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- 2018-07-19 KR KR1020207031278A patent/KR102425653B1/ko active IP Right Grant
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- 2018-07-19 CN CN201880092823.8A patent/CN112055631B/zh active Active
- 2018-07-19 US US16/604,399 patent/US20210323067A1/en not_active Abandoned
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WO2020018131A1 (en) | 2020-01-23 |
EP3755487A1 (en) | 2020-12-30 |
US20210323067A1 (en) | 2021-10-21 |
US20210354196A1 (en) | 2021-11-18 |
CN112055631A (zh) | 2020-12-08 |
US20230286042A1 (en) | 2023-09-14 |
EP3755519A1 (en) | 2020-12-30 |
EP3755487A4 (en) | 2021-10-13 |
KR102425653B1 (ko) | 2022-07-27 |
WO2020018104A1 (en) | 2020-01-23 |
EP3755519A4 (en) | 2021-12-22 |
US11511348B2 (en) | 2022-11-29 |
KR20200134315A (ko) | 2020-12-01 |
CN112055631B (zh) | 2023-08-15 |
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