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Small Detail, Big Impact:Tray Coatings in Furnace

2026-01-19

During a recent technical visit, I noticed a subtle but significant detail on the production line:

More and more high-end manufacturers are switching from the standard Alumina (Al2O3) wash to Zirconia (ZrO2) coating on their sintering trays.

Why do we coat our trays in the first place?

Most people think it's just to prevent Sticking (like a non-stick pan). But for high-performance sintering, the real purpose is Chemical Isolation. It acts as a firewall to stop Carbon diffusion and Cobalt migration between the insert and the graphite tray.

So, which "Firewall" are you using?

Here is a quick comparison:

1️⃣ Alumina (Al2O3) - The "Standard"

Role: The cost-effective industry standard.

Best For: Mining tools, wear parts, and general-purpose grades.

Characteristics: Good basic protection, easy to apply.

2️⃣ Zirconia (ZrO2) - The "Precision Choice"

Role: The high-performance upgrade.

Best For: High-precision CNC inserts, Ultra-fine grain rods.

The Advantage: Zirconia offers a higher melting point and superior chemical inertness. It acts as a stronger barrier against Carbon diffusion and stickiness at high temperatures.

Send your inquiry directly to us

Tel：86--16673365810

Email：shirley.xiao@zzrde.com

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Zhuzhou Ruideer Metallurgy Equipment Manufacturing Co.,Ltd

Zhuzhou Ruideer is a professional manufacturer in PM industry, specializing in producing sintering furnaces.

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