vickers indentation
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Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 652
Author(s):  
Baoguo Wang ◽  
Rong Tu ◽  
Yinglong Wei ◽  
Haopeng Cai

Self-healing ceramics have been researched at high temperatures, but few have been considered at lower temperatures. In this study, SiC-Al2O3-B4C ceramic composite was compacted by spark plasma sintering (SPS). A Vickers indentation was introduced, and the cracks were healed between 600 °C and 800 °C in air. Cracks could be healed completely in air above 700 °C. The ceramic composite had the best healing performance at 700 °C for 30 min, recovering flexural strength of up to 94.2% of the original. Good crack-healing ability would make this composite highly useful as it could heal defects and flaws autonomously in practical applications. The healing mechanism was also proposed to be the result of the oxidation of B4C.


Author(s):  
Changsheng Li ◽  
Jianjun Ding ◽  
Liangchi Zhang ◽  
Chuhan Wu ◽  
Lin Sun ◽  
...  

2021 ◽  
Vol 2 (109) ◽  
pp. 65-79
Author(s):  
V.V. Kulyk ◽  
Z.A. Duriagina ◽  
B.D. Vasyliv ◽  
V. Vavrukh ◽  
T.M. Kovbasiuk ◽  
...  

Purpose: The purpose of this work is to evaluate the propensity to brittle fracture of YSZ ceramics stabilized by the various amount of yttria, based on a study of changes in the microstructure, phase composition, and fracture micromechanisms. Design/methodology/approach: The series of 3YSZ, 4YSZ, and 5YSZ ceramic specimens were sintered in an argon atmosphere. Three sintering temperatures were used for each series: 1450°C, 1500°C, and 1550°C. Microhardness measurements were performed on a NOVOTEST TC-MKB1 microhardness tester. The configuration of the imprints and cracks formed was studied on an optical microscope Neophot-21. The fracture toughness of the material was estimated using both the Vickers indentation method and a single-edge notch beam (SENB) test performed under three-point bending at 20°C in air. The microstructure and morphology of the fracture surface of the specimens were studied using a scanning electron microscope Carl Zeiss EVO-40XVP. The chemical composition was determined using an INCA ENERGY 350 spectrometer. Findings: Peculiarities of changes in the microstructure, the morphology of specimens fracture surface, and mechanical characteristics of YSZ ceramic materials of different chemical and phase compositions sintered in a temperature range of 1450°C to 1550°C are found. Research limitations/implications: To study the actual behaviour of YSZ ceramic materials under operating conditions, it is necessary to evaluate their Young’s moduli, strength, microhardness, and fracture toughness in an operating environment of the corresponding parameters (temperature, pressure, etc.).Practical implications: Based on the developed approach to estimating the propensity to brittle fracture of the formed YSZ ceramic microstructure, it is possible to obtain YSZ ceramic material that will provide the necessary physical and mechanical properties of a wide variety of precision ceramic products. Originality/value: An approach to estimating the propensity to brittle fracture of YSZ ceramics stabilized by the various amount of yttria is proposed based on two methods of evaluating crack growth resistance of materials, namely, the Vickers indentation method and SENB method.


2021 ◽  
Vol 547 ◽  
pp. 152821
Author(s):  
I. Zacharie-Aubrun ◽  
R. Henry ◽  
Th. Blay ◽  
L. Brunaud ◽  
J.M. Gatt ◽  
...  

2021 ◽  
Vol 194 ◽  
pp. 113647
Author(s):  
Xueyao Wang ◽  
Lalitha Kodumudi Venkataraman ◽  
Chi Tan ◽  
Yingwei Li

2020 ◽  
Vol 32 (1) ◽  
pp. 015407
Author(s):  
S M Domínguez-Nicolas ◽  
A L Herrera-May ◽  
L García-González ◽  
L Zamora-Peredo ◽  
J Hernández-Torres ◽  
...  

2020 ◽  
Vol 59 (9) ◽  
pp. 091005
Author(s):  
Yukari Ishikawa ◽  
Yoshihiro Sugawara ◽  
Daisaku Yokoe ◽  
Yongzhao Yao

2020 ◽  
Vol 46 (13) ◽  
pp. 21311-21318
Author(s):  
Le Li ◽  
Linlin Wan ◽  
Qiming Zhou

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