IPC分类号：
B22F3/00 | B33Y80/00 | B33Y70/00 | B33Y10/00 | B29C64/165 | B22F1/00 | B22F1/05 | B22F1/054 | B22F1/10
国民经济行业分类号：
C3516 | C3252 | C3251 | C3393
当前申请(专利权)人：
THE UNIVERSITY OF LIVERPOOL
原始申请(专利权)人：
THE UNIVERSITY OF LIVERPOOL
当前申请(专利权)人地址：
Foundation Building,765 Brownlow Hill,Liverpool Merseyside L69 7ZX GB
发明人：
BLACK, KATE | CHALKER, PAUL R | SUTCLIFFE, CHRISTOPHER J.
摘要：
A method of 3D printing comprises: providing a layer of a powder bed; jetting a functional binder onto selected parts of said layer, wherein said binder infiltrates into pores in the powder bed and locally fuses particles of the powder bed in situ; sequentially repeating said steps of applying a layer of powder on top and selectively jetting functional binder, multiple times, to provide a powder bed bonded at selected locations by printed functional binder; and taking the resultant bound 3D structure out of the powder bed.
技术问题语段：
The technical problem addressed in this patent is the challenge of traditional binder jetting methods, which leave significant porosity and shrinkage in the final product due to the de-binding process. The invention aims to provide a solution to this problem by introducing a new method for binder jetting that reduces porosity and shrinkage while still maintaining the necessary strength for the final product.
技术功效语段：
The patent text discusses additive manufacturing, specifically binder jetting, and the challenges with traditional binder jetting methods. The technical effect of the patent is to provide a method for binder jetting that reduces porosity and shrinkage, while also improving mechanical properties and recycling capabilities of the final product.
权利要求：
Claims
1 . A method of 3D printing comprising:
- providing a layer of a powder bed;
- jetting a functional binder onto selected parts of said layer, wherein said binder infiltrates into pores in the powder bed and locally fuses particles of the powder bed in situ,
- sequentially repeating said steps of applying a layer of powder on top and selectively jetting functional binder, multiple times, to provide a powder bed bonded at selected locations by printed functional binder; and taking the resultant bound 3D structure out of the powder bed.
2. A method as claimed in claim 1 further comprising a subsequent step of heat treatment either inter-layer or post-build to further fuse the 3D structure.
3. A method as claimed in claim 1 or claim 2 wherein the functional binder comprises a metallic binder.
4. A method as claimed in claim 3 wherein the metallic binder comprises an organometallic material.
5. A method as claimed in claim 4 wherein the organometallic material is a copper metal precursor, for example comprising cyclopentadienyl and/or isocyanide ligands.
6. A method as claimed in claim 4 wherein the organometallic material is a nickel metal precursor, for example nickel acetylacetonate.
7. A method as claimed in claim 4 wherein the organometallic material is a titanium metal precursor, for example a titanium amide.
8. A method as claimed in any of claims 1 to 3 wherein the functional binder comprises a ceramic binder.
9. A method as claimed in any preceding claim wherein the binder further comprises metallic or ceramic nanoparticles with sizes within the range of 1 to 100 nm.
10. A method as claimed in any preceding claim wherein the binder further comprises metallic or ceramic microparticles with sizes within the range of 0.1 to 10 microns.
1 1. A method as claimed in any preceding claim wherein the powder of the powder bed comprises metallic or ceramic particles.
12. A method as claimed in any preceding claim wherein the functional binder is jetted onto the powder bed at a temperature within the range of 50 to 350 °C.
13. A functional binder composition as defined in claim 9 or claim 10.
14. A 3D printed product obtainable by the method of any of claims 1 to 12.
15. A 3D printed product comprising fused particles of metal and/or ceramic infiltrated with binder-jetted fused metal and/or ceramic.
16. A product as claimed in any of claims 13 to 15 which is a part or component of a vehicle or of a medical device, implant or prosthesis.
17. Apparatus for carrying out the method of any of claims 1 to 12.