Hard and tough novel high-pressure γ-Si 3N 4/Hf 3N 4 ceramic nanocomposites

IF 18.6 1区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
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
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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/Hf3N4 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-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.
新型高压γ-Si 3n4 /Hf 3n4陶瓷纳米复合材料
立方氮化硅(γ-Si3N4)是超硬材料,是仅次于金刚石和立方氮化硼(cBN)的最硬材料之一,但在氧化环境中具有比金刚石更高的热稳定性,使其成为苛刻条件下(例如钻头和磨料)技术应用的竞争候选人。本文报道了由单相非晶Si-Hf-N前驱体衍生的γ-Si3N4/Hf3N4陶瓷纳米复合材料的高压合成及其结构和力学性能的表征。γ-Si3N4/Hf3N4纳米复合材料的合成在~20 GPa和 ca下进行。1500°C在大容量多顶压机。在约1000 ~ 1900℃的温度范围内,采用同步能量色散x射线衍射在~19.5 GPa下测量了非晶态前驱体在高压下的结构演变及其向γ-Si3N4/Hf3N4纳米复合材料的结晶过程。两相纳米复合材料的断裂韧性约为6/6.9 MPa·m1/2,约为单相γ-Si3N4的2倍,但硬度仍保持在约30 GPa的高水平。本工作为合成具有优异热稳定性的高级硬韧性γ- si3n4基纳米复合材料提供了一条可靠可行的途径。
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来源期刊
Journal of Advanced Ceramics
Journal of Advanced Ceramics MATERIALS SCIENCE, CERAMICS-
CiteScore
21.00
自引率
10.70%
发文量
290
审稿时长
14 days
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.
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