Crack-Healing Function of Nano-Ni/(ZrO&lt;sub&gt;2&lt;/sub&gt;+Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;) Hybrid Materials

Pham, Hai Vu; Nanko, Makoto

doi:10.4028/www.scientific.net/msf.804.179

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…The interface energy between SiC and Al 2 O 3 matrix is higher than the transgranular fracture energy that causes their fracture obeys the transgranular fracture mechanism. 32) Figure 9 shows the fraction of surface crack disappearance as a function of heat-treatment temperatures for 5Ni/mullite with the previously reported results on 5Ni/(10ZrO 2 + Al 2 O 3 ), 33) 5Ni/Al 2 O 3 , 34) and 5Co/Al 2 O 3 . 19) The Ni/mullite requires a lower heat-treatment temperature for surface crack-disappearance than the others nanocomposites based on Al 2 O 3 matrix.…”

Section: Mechanical Propertiessupporting

confidence: 69%

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Self-Healing of Ni/Mullite Hybrid Materials via High-Temperature Oxidation

2017

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Fully-densi ed mullite nanocomposites dispersed with 5 vol% nano-Ni particles were fabricated by the pulsed electric current sintering technique to investigate their self-healing function. The investigation on thermal oxidation for healing the mullite composites was conducted at temperatures ranging from 1000 to 1200 C for 1-24 h in air. Surface cracks with a total length of 180 µm completely disappeared by heat-treatment at 1100 C for 6 h in air. Bending strength of the as-cracked samples which were prepared with three Vickers indentations on the tensile surface only achieves 113 MPa. Disappearance of surface cracks realizes a recovery of bending strength up to 434 MPa, which is comparable with that of as-sintered samples (405 MPa). With heat-treatment in Ar-1%H 2 at 1100 C for 6 h, the samples show neither surface crack-disappearance nor strength recovery. It is clear that the oxidation of Ni particles at high temperatures induces the self-healing mechanism. The surface crack-disappearance in Ni/mullite is available at lower heat-treatment conditions than the other metal/oxide composites such as Ni/Al 2 O 3 and Ni/(ZrO 2 +Al 2 O 3). Additional information on mechanical properties such as hardness and fracture toughness of the composite are also provided. Dispersion of Ni particles in mullite matrix does not give effect to their hardness and fracture toughness.

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Section: Mechanical Propertiessupporting

confidence: 69%

“…The fraction of surface crack-disappearance as a function of heat-treatment temperature for 5Ni/mullite, 5Ni/(ZrO 2 +Al 2 O 3 ),33) 5Ni/ Al 2 O 3 ,34) and 5Co/Al 2 O 3 19). …”

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confidence: 99%

Self-Healing of Ni/Mullite Hybrid Materials via High-Temperature Oxidation

2017

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“…The authors' group has studied the self‐healing mechanism of nano‐Ni/Al 2 O 3 over the past decade . Oxidation of nano‐Ni particles in the matrix at high temperatures induced the formation of an internal oxidized zone and an external layer of oxidation product .…”

Section: Introductionmentioning

confidence: 99%

High‐temperature Bending Strength of Self‐Healing Ni/Al₂O₃ Nanocomposites

Pham

Nanko

Nakao

2016

Int J Applied Ceramic Tech

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Bending strength of 5 vol.% Ni/Al2O3 composites as a function of testing temperature is investigated at temperatures ranging from room temperature to 1200°C. Self‐healing performance at high temperatures of the composites is evaluated by conducting high‐temperature bending tests for as‐sintered, as‐cracked, and as‐healed specimens. Bending strength of as‐sintered specimens dramatically decreases from 995 MPa at room temperature to 205 MPa at 1200°C. Additionally, the plastic deformation of the as‐sintered specimens occurs when the testing temperature reaches to 1200°C. The values of high‐temperature bending strength of as‐healed specimens are comparable with those of as‐sintered specimens. Similar to that of as‐sintered specimens, bending strength of as‐healed specimens degrades when the testing temperature increases. Results of the present study indicate that the recovery of bending strength by the self‐healing function is able to achieve at temperatures as high as 1200°C. Unlike the mechanical behaviors at high temperatures of as‐sintered and as‐healed specimens, the bending strength of as‐cracked specimens slightly increases with the increase of testing temperature. This phenomenon is attributed to the effect of the self‐healing mechanism during high‐temperature bending tests.

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“…Stabilized tetragonal zirconia is well known as an excellent ceramic material which has superior mechanical properties due to transformation-toughening mechanism [12,13]. Similar to Ni/Al 2 O 3 composites, Ni/(ZrO 2 +Al 2 O 3 ) has been reported to have self-healing abilities [14]. Nonetheless, t-ZrO 2 is also known as an ionic conductor [15,16] which would affect oxidation resistance of the composites.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Resistance and Bending Strength at High Temperatures of Ni/(ZrO2+Al2O3) Hybrid Materials

Pham

Nanko

Nakao

2018

MSF

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Oxidation resistance and bending strength at high temperatures of 5 vol% Ni/(10 vol% ZrO2+Al2O3) were investigated in this paper. Oxidation tests were conducted at temperature ranging from 1100 to 1300oC for 1 to 24 h in air. The oxidation resistance of the composites was studied via observation of oxidized-zone development from a cross-section view after oxidation. Three-point bending tests were conducted at temperatures ranging from room temperature to 1200oC in order to estimate its performance at high temperatures. Bending strength of the composites achieved 1200 MPa at room temperature and 460 MPa at 1200oC. Dispersion of ZrO2in Ni/Al2O3composites enhanced both their room and high temperature bending strength. Nevertheless, ZrO2slightly degraded the oxidation resistance of the composites. The oxidation rate of Ni/(ZrO2+Al2O3) was one order of magnitude higher than that of Ni/Al2O3.

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Crack-Healing Function of Nano-Ni/(ZrO<sub>2</sub>+Al<sub>2</sub>O<sub>3</sub>) Hybrid Materials

Cited by 3 publications

References 15 publications

Self-Healing of Ni/Mullite Hybrid Materials via High-Temperature Oxidation

Self-Healing of Ni/Mullite Hybrid Materials via High-Temperature Oxidation

High‐temperature Bending Strength of Self‐Healing Ni/Al₂O₃ Nanocomposites

Oxidation Resistance and Bending Strength at High Temperatures of Ni/(ZrO<sub>2</sub>+Al<sub>2</sub>O<sub>3</sub>) Hybrid Materials

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Crack-Healing Function of Nano-Ni/(ZrO<sub>2</sub>+Al<sub>2</sub>O<sub>3</sub>) Hybrid Materials

Cited by 3 publications

References 15 publications

Self-Healing of Ni/Mullite Hybrid Materials via High-Temperature Oxidation

Self-Healing of Ni/Mullite Hybrid Materials via High-Temperature Oxidation

High‐temperature Bending Strength of Self‐Healing Ni/Al2O3 Nanocomposites

Oxidation Resistance and Bending Strength at High Temperatures of Ni/(ZrO<sub>2</sub>+Al<sub>2</sub>O<sub>3</sub>) Hybrid Materials

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High‐temperature Bending Strength of Self‐Healing Ni/Al₂O₃ Nanocomposites