Core-shell structure: An effective feature for strengthening ZrB2 ceramics

被引：44

作者：

Silvestroni, Laura ^{[1
]}

Failla, Simone ^{[1
,2
]}

Vinokurov, Vladimir ^{[3
]}

Neshpor, Irina ^{[3
]}

Grigoriev, Oleg ^{[3
]}

机构：

[1] CNR ISTEC, Natl Res Council Italy, Inst Sci & Technol Ceram, Via Granarolo 64, I-48018 Faenza, Italy

[2] Univ Parma, Dept Chem, Life Sci & Environm Sustainabil, Parco Area Sci 11-a, I-43124 Parma, Italy

[3] IPMS, Frantsevich Inst Problems Mat Sci NAS Ukraine, 3 Krzhizhanovskoho St, UA-03680 Kyev, Ukraine

来源：

SCRIPTA MATERIALIA | 2019年 / 160卷

关键词：

Borides; Core-shell; Creep; Dislocation mobility; Grain boundaries; ZIRCONIUM DIBORIDE; OXIDATION BEHAVIOR; ZRB2-SIC-WC CERAMICS; FLEXURAL CREEP; DEGREES-C; COMPOSITES; RESISTANCE; MICROSTRUCTURE; DENSIFICATION; TEMPERATURES;

D O I：

10.1016/j.scriptamat.2018.09.024

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Hot compression behavior of two ZrB2 ceramics containing SiC or WSi2 particles was investigated upon stepwise heating from 1700 to 2100 degrees C under static load in vacuum. Presence of SiC activated notable creep already at 1700 degrees C, owing to diffused silica softening at SiC/SiC interfaces, whilst for WSi2 appreciable deformation occurred only above 1900 degrees C. Limited amount of SiC particles, which is responsible for cavitation, and formation of (Zr,W)B-2 solid solution, able to accommodate high mechanical loads through plastic deformation, are fundamental characteristics to remarkably perform in hot environments. Particularly, dislocation activity in the solid solution plays a fundamental role at ultra-high temperatures. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1 / 4

页数：4

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