IPC分类号：
B33Y70/00 | B29C64/106 | B33Y10/00 | B33Y80/00 | B28B1/00 | C08K3/38 | D01F1/10 | B29C70/62 | C08K7/00
当前申请(专利权)人：
3M INNOVATIVE PROPERTIES COMPANY
原始申请(专利权)人：
3M INNOVATIVE PROPERTIES COMPANY
当前申请(专利权)人地址：
3M Center,Post Office Box 33427,Saint Paul, Minnesota 55133-3427 US
发明人：
SCHÄDEL, ROBERT M. | UIBEL, KRISHNA B. | WILDHACK, STEFANIE
代理人：
SPIELBAUER, THOMAS M., ET AL.
摘要：
The present disclosure relates to a filamentary structure manufactured during 3D printing by fused filament fabrication, the filamentary structure comprising a continuous strand comprising a thermoplastically workable material and filler particles, wherein the filler particles comprise hexagonal boron nitride particles comprising hexagonal boron nitride platelets. The present disclosure further relates to a 3D printable filament for manufacturing said filamentary structure, to a 3D printed component part formed from said filamentary structure, to a 3D printing method for making said 3D printed component part, and to the use of said component part.
技术问题语段：
The technical problem addressed in this patent is the need for a thermally conductive component part that has a high in-plane thermal conductivity and is economically producible. The current methods for producing thermally conductive components using thermally conductive fillers like alumina or boron nitride have limitations in terms of orientation and thermal conductivity. The invention proposes a new filamentary structure that overcomes these limitations and allows for the production of 3D printed components with improved thermal conductivity.
技术功效语段：
The present patent is about a new type of 3D printed component part that is made from a thermoplastic material and boron nitride particles. The boron nitride particles are hexagonal boron nitride platelets that are oriented in a way that increases the thermal conductivity of the component part. The orientation of the boron nitride particles can be controlled through the process of injection molding, which allows for higher thermal conductivity in certain regions of the component part. The resulting component part has high in-plane thermal conductivity and can be used in applications where heat needs to be transferred quickly. The method for making the component part involves using a 3D printable filament that contains a thermoplastic material and filler particles, which are hexagonal boron nitride particles. The orientation of the boron nitride particles can be controlled through the process of injection molding, which allows for higher thermal conductivity in certain regions of the component part. The invention provides a new solution for creating highly thermally conductive components that are economically producible.
权利要求：
Claims
1. A filamentary structure manufactured during 3D printing by fused filament fabrication, the filamentary structure comprising a continuous strand comprising a thermoplastic workable material and filler particles, wherein the filler particles comprise hexagonal boron nitride particles comprising hexagonal boron nitride platelets, and wherein the ratio of the width of the continuous strand to the height of the continuous strand is either more than 2 or less than 1.
2. The filamentary structure of claim 1, wherein the boron nitride platelets have a mean aspect ratio of more than 7.
3. The filamentary structure of claim 1 or 2, wherein the mean particle size (dso) of the boron nitride platelets is from 5 to 100 pm.
4. The filamentary structure of any of claims 1 to 3, wherein the thermoplastically workable material is selected from the group consisting of thermoplastic materials, thermoplastically workable duroplastic materials, and mixtures thereof.
5. The filamentary structure of any of claims 1 to 4, wherein at least one part of the continuous strand comprises portions being oriented parallel to one another.
6. A 3D printed component part comprising at least one portion formed from the filamentary structure of any one of claims 1 to 5.
7. The component part of claim 6, wherein the at least one portion of the component part formed from the filamentary structure of any one of claims 1 to 5 has a texture index of at least 8, and wherein the ratio of the width of the continuous strand to the height of the continuous strand is more than 2.
8. The component part of claim 6, wherein the at least one portion of the component part formed from the filamentary structure of any one of claims 1 to 5 has a texture index of less than 1, and wherein the ratio of the width of the continuous strand to the height of the continuous strand in the filamentary structure is less than 1.
9. The component part according to any one of claims 6 to 8, wherein the at least one portion of the component part has a relative density of at least 60% of the theoretical density of the filamentary structure.
10. A 3D printing method for making the 3D printed component part of any one of claims 6 to 9, the method comprising
providing a 3D printable filament, the 3D printable filament comprising a thermoplastically workable material and filler particles, wherein the filler particles comprise hexagonal boron nitride particles comprising hexagonal boron nitride platelets,
melting the 3D printable filament,
extruding the molten filament from a nozzle to form a continuous strand and depositing the continuous strand on a substrate in a predetermined pattern layer by layer to form a filamentary structure, and
cooling the filamentary structure to form a 3D printed component part comprising the thermoplastically workable material and filler particles dispersed therein, wherein the filler particles comprise hexagonal boron nitride particles comprising hexagonal boron nitride platelets, the hexagonal boron nitride platelets having a predetermined orientation in the cooled thermoplastically workable material; wherein
(i) the ratio of the width of the continuous strand to the height of the continuous strand is more than 2, and wherein the hexagonal boron nitride platelets have a basal plane, and wherein the basal plane of the hexagonal boron mtnde platelets in the cooled thermoplastically workable material is oriented parallel to the substrate, or
(ii) the ratio of the width of the continuous strand to the height of the continuous strand is less than 1, and wherein the hexagonal boron nitride platelets have a basal plane, and wherein the basal plane of the hexagonal boron nitride platelets in the cooled thermoplastically workable material is oriented perpendicular to the substrate.
11. The method of claim 10, wherein the ratio of the width of the continuous strand to the height of the continuous strand is more than 2, and wherein the hexagonal boron nitride platelets have a basal plane, and wherein the basal plane of the hexagonal boron nitride platelets is oriented parallel to the substrate.
12. The method of claim 10, wherein the ratio of the width of the continuous strand to the height of the continuous strand is less than 1, and wherein the hexagonal boron nitride platelets have a basal plane, and wherein the basal plane of the hexagonal boron nitride platelets is oriented perpendicular to the substrate.
13. The method of any of claims 10 to 12, wherein at least one part of the continuous strand is deposited in portions being oriented parallel to one another.
14. Use of the component part of any of claims 6 to 9 as thermal conduction means to control the temperature of electrical and electronic components or assemblies or batteries.
15. A 3D printable fdament for manufacturing the filamentary structure of any of claims 1 to 5 during 3D printing, wherein the fdament comprises a thermoplastically workable material and fdler particles,
wherein the filler particles comprise hexagonal boron nitride particles comprising hexagonal boron nitride platelets.