2020
DOI: 10.1111/ijac.13517
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Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

Abstract: Zirconia‐toughened alumina (ZTA) ceramics with high mechanical properties were sintered by hot‐pressing method using SiC particles (SiCp) and SiC whiskers (SiCw) as the reinforcing agents simultaneously. The influences of sintering temperature, SiCp, and SiCw contents on the microstructure and mechanical properties of ZTA ceramics were investigated. It was found that both SiCp and SiCw could contribute to grain refinement significantly and promote the mechanical properties of the ceramics. However, the excess … Show more

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Cited by 12 publications
(3 citation statements)
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“…However, at higher SiC contents, the flexural strength decreased, likely because excess SiC caused a thermal expansion mismatch between the matrix and SiC, leading to excessive internal residual stress, causing micro-cracks inside the porcelain to cause defects. [25][26][27] temperature and holding time markedly influenced the flexural strength, and this trend is related to that of the bulk density, as shown in Figures 1 and 2. At excessively high low or high firing temperatures and holding times, the porosity of the porcelain and the bulk density increased; however, the bulk density and flexural strength decreased.…”
Section: Microscopic Morphological Analysis Of Porcelainmentioning
confidence: 80%
See 1 more Smart Citation
“…However, at higher SiC contents, the flexural strength decreased, likely because excess SiC caused a thermal expansion mismatch between the matrix and SiC, leading to excessive internal residual stress, causing micro-cracks inside the porcelain to cause defects. [25][26][27] temperature and holding time markedly influenced the flexural strength, and this trend is related to that of the bulk density, as shown in Figures 1 and 2. At excessively high low or high firing temperatures and holding times, the porosity of the porcelain and the bulk density increased; however, the bulk density and flexural strength decreased.…”
Section: Microscopic Morphological Analysis Of Porcelainmentioning
confidence: 80%
“…When the SiC content was 8 wt%, the flexural strength reached its maximum value of 122 ± 4 MPa, which is 90.6% higher than that of the matrix (64 ± 5 MPa). However, at higher SiC contents, the flexural strength decreased, likely because excess SiC caused a thermal expansion mismatch between the matrix and SiC, leading to excessive internal residual stress, causing micro‐cracks inside the porcelain to cause defects 25–27 …”
Section: Resultsmentioning
confidence: 99%
“…Lots of effort has been made to alleviate the brittle failure of ceramic materials. Such as phase change toughening, [3][4][5] particle dispersion toughening, 6,7 whisker toughening, [8][9][10] long fiber toughening, 11,12 and bionic structure toughening 2,13,14 developed to overcome the sensitivity to defect. Among them, the long fiber toughening and bionic structure composite ceramics achieve the optimal nonbrittle failure manner with high toughness and work of fracture together with considerable strength.…”
Section: Introductionmentioning
confidence: 99%