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Negative Additive Manufacturing of Complex Shaped Boron Carbides

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Published on: September 18, 2018

Thermoformable Boron Nitride Based All-Ceramics.

Jason E Bice¹, Echo St Germain¹, Samuel J Wohlever¹

¹Department of Mechanical and Industrial Engineering, Northeastern University; 334 Snell Engineering Center, 360 Huntington Avenue, Boston, MA, 02115, USA.

Advanced Materials (Deerfield Beach, Fla.)

|September 4, 2022

Summary

This summary is machine-generated.

This study demonstrates thermoforming for boron nitride composite ceramics, enabling complex, thin parts. This innovation offers advanced ceramic heat spreaders for electronics, outperforming traditional metal solutions.

Keywords:

boron-based ceramics ceramic matrix composites phononic heat transfer thermal management thermoforming

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Published on: January 7, 2019

Area of Science:

Materials Science
Ceramics Engineering
Manufacturing Processes

Background:

Thermoforming is typically limited to polymers and metals.
Boron-based all-ceramics present unique processing challenges.
Advanced thermal management solutions are needed for electronics.

Purpose of the Study:

To extend thermoforming to boron nitride (BN) based all-ceramics.
To develop a novel workflow for fabricating complex ceramic components.
To create high-performance, low-profile ceramic heat spreaders.

Main Methods:

Sintered BN composite sheets were fabricated using vibration and tape-casting photopolymerization.
The sheets exhibited an oriented microstructure allowing for pseudo-plastic flow during compression molding.
Bespoke all-ceramic heat spreaders were manufactured using a new workflow.

Main Results:

Thermoforming successfully produced thin, complex ceramic parts with features as small as 200 µm.
The processed ceramic heat spreaders demonstrated superior performance compared to metal heat sinks.
The developed method allows for press-fitting onto printed circuit boards.

Conclusions:

Thermoforming is a viable processing technique for boron nitride composites.
This approach enables the creation of advanced ceramic components for thermal management.
The methodology can be adapted for thermoforming other all-ceramics with ordered microstructures.