View in EDS

Enhancing thermal transport and mechanical reliability in AlN ceramics through Y₂O₃-mediated optimization of 3YSZ co-additive effects.

Saved in:
Bibliographic Details
Title: Enhancing thermal transport and mechanical reliability in AlN ceramics through Y₂O₃-mediated optimization of 3YSZ co-additive effects.
Authors: Yang, Sheng-Lun1 (AUTHOR), Chu, Chih-Hung2 (AUTHOR), Hsiang, Hsing-I1 (AUTHOR) hsingi@mail.ncku.edu.tw
Source: Journal of Materials Science: Materials in Electronics. May2026, Vol. 37 Issue 15, p1-19. 19p.
Abstract: Pressureless-sintered AlN ceramics often suffer from a trade-off between high thermal conductivity and mechanical reliability due to oxygen impurities and grain-boundary phases. In this work, the effects of incremental Y₂O₃ addition (5–7 wt%) at a fixed 1 wt% 3YSZ on the phase evolution, oxygen chemistry, microstructure, and properties of AlN ceramics were systematically investigated. Increasing Y₂O₃ enhances oxygen scavenging from the AlN lattice and modifies Y–Al–O phase assemblages, while in-situ nitridation of ZrO₂ to ZrN suppresses excessive grain growth and promotes crack deflection. Thermal conductivity and mechanical strength are governed by the balance between oxygen removal, grain-boundary density, and secondary-phase distribution. An optimized composition, 6Y1Z, exhibits a high thermal conductivity of 193.7 W·m⁻1·K⁻1 together with a flexural strength of 465 MPa and a fracture toughness of 3.28 MPa·m1ᐟ2. Performance-map analysis indicates that this composition approaches a near-optimal balance among pressureless-sintered AlN ceramics, demonstrating an industrially viable route to high-performance AlN substrates. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Pressureless-sintered AlN ceramics often suffer from a trade-off between high thermal conductivity and mechanical reliability due to oxygen impurities and grain-boundary phases. In this work, the effects of incremental Y₂O₃ addition (5–7 wt%) at a fixed 1 wt% 3YSZ on the phase evolution, oxygen chemistry, microstructure, and properties of AlN ceramics were systematically investigated. Increasing Y₂O₃ enhances oxygen scavenging from the AlN lattice and modifies Y–Al–O phase assemblages, while in-situ nitridation of ZrO₂ to ZrN suppresses excessive grain growth and promotes crack deflection. Thermal conductivity and mechanical strength are governed by the balance between oxygen removal, grain-boundary density, and secondary-phase distribution. An optimized composition, 6Y1Z, exhibits a high thermal conductivity of 193.7 W·m⁻1·K⁻1 together with a flexural strength of 465 MPa and a fracture toughness of 3.28 MPa·m1ᐟ2. Performance-map analysis indicates that this composition approaches a near-optimal balance among pressureless-sintered AlN ceramics, demonstrating an industrially viable route to high-performance AlN substrates. [ABSTRACT FROM AUTHOR]
ISSN:09574522
DOI:10.1007/s10854-026-17605-1