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Drilling Aluminum Nitride (AlN) substrates, which are hard and brittle (2000 Vickers), requires specialized techniques like laser drilling, diamond-coated tools, or ultrasonic machining to avoid cracking. Laser drilling is the preferred industrial method for precision, while diamond tools are used for mechanical drilling. Key precautions include using low force, efficient cooling, and managing slag removal.

Laser Drilling: The preferred method for high-accuracy, micro-holes, and complex shapes in electronics and PCB applications. It is a non-contact process which is advantageous for fragile, high-hardness ceramics.
Diamond Core Drills: Mechanical drilling is possible with diamond-coated tools. Due to the hardness of AlN, this is technically grinding rather than cutting.
CNC Machining: Suitable for creating grooves or larger, specialized hole geometries.

Slag/Debris Management: Laser drilling often leaves melted, solidified debris (slag) that requires post-processing such as chemical etching, abrasive blasting, or tumbling.
High Thermal Management: AlN has high thermal conductivity, but excessive heat during drilling can cause thermal shock and cracking. Use coolant or air-assisted cooling to manage temperatures.
Avoid Excessive Force: As a brittle ceramic, excessive drilling pressure will break the substrate.
Tooling: Use diamond abrasive tools or specialized hardened bits, as standard carbide tools may not be effective.

Laser Drilling Aluminum Nitride Ceramic Substrate AlN Sheet
Our Aluminum Nitride Ceramic has high coefficient of heating conductivity, good performance of electricity resistance. And it also...
Fujian Huaqing Electronic Material Technology Co.,Ltd
Aluminum nitride product / AlN substrate with grooves and holes
Laser Drilled Ceramic Substrates Slag Removal - Valley Design
Laser drilled holes in substrates of Aluminum Nitride and Aluminum Oxide have slag which occurs when the substrate material is mel...
Valley Design

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Aluminum nitride product / AlN substrate with grooves and ...

Top Seiko

https://top-seiko.com › works › aluminum-nitride9

Top Seiko

https://top-seiko.com › works › aluminum-nitride9

Aluminum Nitride. Processing Method, Grooving & hole drilling by CNC milling. Size. 75 x 75 x 1 mm(T). Application. Aluminum nitride heater substrate.Read more

Laser Drilled Ceramic Substrates Slag Removal

Valley Design

https://valleydesign.com › Landing Domains

Valley Design

https://valleydesign.com › Landing Domains

Laser drilled holes in substrates of Aluminum Nitride and Aluminum Oxide have slag which occurs when the substrate material is melted by the laser beam.Read more

Laser Drilling Aluminum Nitride Ceramic Substrate AlN Sheet

Fujian Huaqing Electronic Material Technology Co.,Ltd

https://www.huaqingcn.com › laser-drilling-aluminum-ni...

Fujian Huaqing Electronic Material Technology Co.,Ltd

https://www.huaqingcn.com › laser-drilling-aluminum-ni...

Our Aluminum Nitride Ceramic has high coefficient of heating conductivity, good performance of electricity resistance. And it also has low expansion ...Read more

Experimental study on hole drilling in aluminum nitride ...

SPIE Digital Library

https://www.spiedigitallibrary.org › 12.3080252.full

SPIE Digital Library

https://www.spiedigitallibrary.org › 12.3080252.full

by S Baek2026 — This study investigated femtosecond laser drilling of microholes in aluminum nitride (AlN) substrates by analyzing the effects of key processing ...Read more

aluminum nitride PCB substrate

EEVblog

https://www.eevblog.com › forum › projects › aluminu...

EEVblog

https://www.eevblog.com › forum › projects › aluminu...

Dec 4, 2017 — AlN is a hard brittle ceramic and is drilled with diamond or lasers. It's used for it's extremely high thermal conductivity.Read more

An Investigation on Micro-via Drilling on Ceramic ...

IEEE Web Hosting

https://ewh.ieee.org › IEMT-EMAP_2016_Paper_074

IEEE Web Hosting

https://ewh.ieee.org › IEMT-EMAP_2016_Paper_074

However, Aluminum nitride is much more expensive than Alumina because of the higher meltng temperature and difficulty of micro pore control during sintering ...Read more

Controlled-atmosphere laser drilling and microvia ...

ScienceDirect.com

https://www.sciencedirect.com › article › abs › pii

ScienceDirect.com

https://www.sciencedirect.com › article › abs › pii

by Y Wang2026 — Aluminum nitride (AlN) ceramics are promising for ... Laser drilling experiments were conducted on 50 mm × 50 mm AlN substrates ...Read more

What are the handling precautions for Aluminum Nitride ...

anilaoiloilo.com

https://www.anilaoiloilo.com › blog › 2026/04/02 › what...

anilaoiloilo.com

https://www.anilaoiloilo.com › blog › 2026/04/02 › what...

Apr 2, 2026 — Cutting and Drilling: When cutting or drilling aluminum nitride substrates, use appropriate tools and techniques. Diamond cutting wheels or ...Read more

Aluminum Nitride Machining (AlN) | Applied Ceramics, Inc.

appliedceramics.net

https://www.appliedceramics.net › Materials

appliedceramics.net

https://www.appliedceramics.net › Materials

Our refined machining processes enable Applied Ceramics to drill, grind or thread Aluminum Nitride with great accuracy and repeatability. Contact an ...Read more

Drilling holes in Aluminium Nitride(Or maybe sapphire) ...

Reddit · r/Machinists

5 comments · 2 years ago