Wei Li, Zhaoju Yu, Leonore Wiehl, Tianshu Jiang, Ying Zhan, Emmanuel III Ricohermoso, Martin Etter, Emanuel Ionescu, Qingbo Wen, Christian Lathe, Robert Farla, Dharma Teppala Teja, Sebastian Bruns, Marc Widenmeyer, Anke Weidenkaff, Leopoldo Molina-Luna, Ralf Riedel, Shrikant Bhat
{"title":"Hard and tough novel high-pressure <i>γ</i>-Si <sub>3</sub>N <sub>4</sub>/Hf <sub>3</sub>N <sub>4</sub> ceramic nanocomposites","authors":"Wei Li, Zhaoju Yu, Leonore Wiehl, Tianshu Jiang, Ying Zhan, Emmanuel III Ricohermoso, Martin Etter, Emanuel Ionescu, Qingbo Wen, Christian Lathe, Robert Farla, Dharma Teppala Teja, Sebastian Bruns, Marc Widenmeyer, Anke Weidenkaff, Leopoldo Molina-Luna, Ralf Riedel, Shrikant Bhat","doi":"10.26599/jac.2023.9220764","DOIUrl":null,"url":null,"abstract":"Cubic silicon nitride (γ-Si<sub>3</sub>N<sub>4</sub>) is superhard and one of the hardest materials after diamond and cubic boron nitride (cBN), but has higher thermal stability in an oxidizing environment than diamond, making it a competitive candidate for technological applications in harsh conditions (e.g., drill head and abrasives). Here, we report the high-pressure synthesis and characterization of the structural and mechanical properties of a γ-Si<sub>3</sub>N<sub>4</sub>/Hf<sub>3</sub>N<sub>4</sub> ceramic nanocomposite derived from single-phase amorphous Si-Hf-N precursor. The synthesis of the γ-Si<sub>3</sub>N<sub>4</sub>/Hf<sub>3</sub>N<sub>4</sub><sub> </sub>nanocomposite is performed at ~20 GPa and ca. 1500 °C in a large volume multi anvil press. The structural evolution of the amorphous precursor and its crystallization to γ-Si<sub>3</sub>N<sub>4</sub>/Hf<sub>3</sub>N<sub>4</sub> nanocomposites under high pressure is assessed by <em>in situ</em> synchrotron energy-dispersive X-ray diffraction measurements at ~19.5 GPa in the temperature range from ca. 1000-1900 °C. The fracture toughness of the two-phase nanocomposite amounts ~6/6.9 MPa·m<sup>1/2</sup> and is about 2 times that of single-phase γ-Si<sub>3</sub>N<sub>4</sub>, while its hardness of ca. 30 GPa remains high. This work provides a reliable and feasible route for the synthesis of advanced hard and tough γ-Si<sub>3</sub>N<sub>4</sub>-based nanocomposites with excellent thermal stabililty.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":null,"pages":null},"PeriodicalIF":18.6000,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Advanced Ceramics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.26599/jac.2023.9220764","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 1
Abstract
Cubic silicon nitride (γ-Si3N4) is superhard and one of the hardest materials after diamond and cubic boron nitride (cBN), but has higher thermal stability in an oxidizing environment than diamond, making it a competitive candidate for technological applications in harsh conditions (e.g., drill head and abrasives). Here, we report the high-pressure synthesis and characterization of the structural and mechanical properties of a γ-Si3N4/Hf3N4 ceramic nanocomposite derived from single-phase amorphous Si-Hf-N precursor. The synthesis of the γ-Si3N4/Hf3N4nanocomposite is performed at ~20 GPa and ca. 1500 °C in a large volume multi anvil press. The structural evolution of the amorphous precursor and its crystallization to γ-Si3N4/Hf3N4 nanocomposites under high pressure is assessed by in situ synchrotron energy-dispersive X-ray diffraction measurements at ~19.5 GPa in the temperature range from ca. 1000-1900 °C. The fracture toughness of the two-phase nanocomposite amounts ~6/6.9 MPa·m1/2 and is about 2 times that of single-phase γ-Si3N4, while its hardness of ca. 30 GPa remains high. This work provides a reliable and feasible route for the synthesis of advanced hard and tough γ-Si3N4-based nanocomposites with excellent thermal stabililty.
期刊介绍:
Journal of Advanced Ceramics is a single-blind peer-reviewed, open access international journal published on behalf of the State Key Laboratory of New Ceramics and Fine Processing (Tsinghua University, China) and the Advanced Ceramics Division of the Chinese Ceramic Society.
Journal of Advanced Ceramics provides a forum for publishing original research papers, rapid communications, and commissioned reviews relating to advanced ceramic materials in the forms of particulates, dense or porous bodies, thin/thick films or coatings and laminated, graded and composite structures.