Study on Y‐Mg‐Si alloy additives to improve the thermal conductivity of Si₃N₄ by efficient deoxygenation

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Sintering with Y-Mg-Si alloy boosts thermal conductivity by 22% in Si3N4, suggesting efficient deoxygenation methods.

Thermal conductivity increased to 52.7 W·m −1 ·K −1 with 6 wt% Y-Mg-Si alloy additive, marking a 22% improvement.
Si3N4 ceramics achieved 96% density after hot-pressing at 1750°C for 2 hours, with varying alloy content affecting microstructure.
Alloy additive enhanced N/O ratio by reacting with SiO2, mitigating lattice oxygen effects on thermal conductivity.
After heat treatment at 1850°C for 5 hours, thermal conductivity further improved to 67.2 W·m −1 ·K −1, ensuring high strength.

Lv et al. (2025) studied this question.

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