Stress-Corrosion Cracking in Alumina Ceramics

Баринов, С. М.; Fateeva, L. V.; Shevchenko, V.Ja.; Ballóková, Beáta; Hvizdoš, Pavol; Rudnayová, E.

doi:10.4028/www.scientific.net/kem.223.187

Cited by 2 publications

(2 citation statements)

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“…The second shortcoming is that crack propagation occurs during the etching of the substrate in a chemically active environment. This can influence the results of the measurements in case the tested layer is not perfectly resistant to the etchant or if the etchant species adsorb on the crack surfaces changing the surface energy [14], [15]. Furthermore, when a liquid etchant is used to release the test structure, supercritical drying must be used to prevent liquid surface tension forces from affecting the arrested crack.…”

Section: ∂U (A) ∂Amentioning

confidence: 99%

Fracture Toughness of Free-Standing ZrSi_x Thin Films Measured Using Crack-on-a-Chip Method

Shafikov¹,

Kruijs

Benschop

et al. 2022

J. Microelectromech. Syst.

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In this work, we experimentally measure fracture toughness of free-standing zirconium ZrSi x thin films using the crack-on-a-chip method. In this method, fracture toughness is determined from the analysis of cracks, which propagate and arrest in specially designed free-standing test structures. The test structures use a well-known double cantilever beam geometry, which enables crack arrest, and don't require any external force actuation, but instead rely on the internal tensile stress of the tested thin film. To produce the ZrSi x test structures, a universal fabrication process was developed and used, which avoids typical issues related to etch selectivity and that can be readily applied for other thin film materials. Unlike in previous studies, which used the crack-on-a-chip method, in this work crack initiation was triggered only after the test structures were fully fabricated, which allowed to avoid the influence of the fabrication process on the extracted toughness values. For this, blunt pre-cracks included in the structures were "sharpened" using focused ion beam, which resulted in rapid crack propagation and subsequent crack arrest. Mechanical analysis done by a finite element method to extract the values of fracture toughness, showed that buckling of the free-standing thin film test structures has a strong influence on the results of fracture toughness calculations and therefore cannot be ignored. The fracture toughness of ZrSi x thin films was determined to be 2.1±0.13 MPa * m 0.5 .[2021-0166]

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Section: ∂U (A) ∂Amentioning

confidence: 99%

Fracture Toughness of Free-Standing ZrSi_x Thin Films Measured Using Crack-on-a-Chip Method

Shafikov¹,

Kruijs

Benschop

et al. 2022

J. Microelectromech. Syst.

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“…It is considered that SiAlON is a solid solution of Si 3 N 4 with aluminum nitride and oxide [14]- [18].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Composites by Nitro Aluminothermic Processes, over β–SiAlON Matrix in the SiAlON-SiC-Al2O3 System

Kovziridze¹,

Nizharadze²,

Darakhvelidze³

et al. 2016

JECTC

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Goal: The goal of the research is preparation of SiAlON-containing composite through nitro aluminothermic processes, by the methods of reactive sintering and hot compaction. Method: The composite CH-6 was obtained by the method of reactive sintering, with further grinding and hot compression in vacuum furnace at 1600˚C, under 30 MPa pressure and 10-12 min standing at the final temperature. Precursor was prepared in a thermostat at 150 0 C temperature by double compression. Pressure equaled to 20-25 MPa. Results: Physical-technical properties of specimens prepared via hot compaction were investigated. Mechanical strength at compression is 1940 MPa; mechanical strength at bending is 490 MPa; elastic module is 199.5 GPa, HV-11.6 GPa. X-Ray diffraction analysis, electron microscopic and X-ray diffraction Microspectral analysis were used to investigate composite microstructure and phase composition. Composite formulation was defined, the main phases of which were: β-SiAlON, corundum and silicium carbide. Conclusion: Composite CH-6 has been selected from the obtained composites, which is characterized by relatively high physical-technical properties: strength, density and hardness. Materials can be used for making high refractory articles, such as jackets to secure thermocouples, furnace bedding, cutting tools for metal and wood treatment, in rocket spatial technology and others.

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Stress-Corrosion Cracking in Alumina Ceramics

Cited by 2 publications

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Fracture Toughness of Free-Standing ZrSi_x Thin Films Measured Using Crack-on-a-Chip Method

Fracture Toughness of Free-Standing ZrSi_x Thin Films Measured Using Crack-on-a-Chip Method

Preparation of Composites by Nitro Aluminothermic Processes, over <i>β</i>–SiAlON Matrix in the SiAlON-SiC-Al<sub>2</sub>O<sub>3</sub> System

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Stress-Corrosion Cracking in Alumina Ceramics

Cited by 2 publications

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Fracture Toughness of Free-Standing ZrSix Thin Films Measured Using Crack-on-a-Chip Method

Fracture Toughness of Free-Standing ZrSix Thin Films Measured Using Crack-on-a-Chip Method

Preparation of Composites by Nitro Aluminothermic Processes, over &lt;i&gt;β&lt;/i&gt;–SiAlON Matrix in the SiAlON-SiC-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; System

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Fracture Toughness of Free-Standing ZrSi_x Thin Films Measured Using Crack-on-a-Chip Method

Fracture Toughness of Free-Standing ZrSi_x Thin Films Measured Using Crack-on-a-Chip Method

Preparation of Composites by Nitro Aluminothermic Processes, over <i>β</i>–SiAlON Matrix in the SiAlON-SiC-Al<sub>2</sub>O<sub>3</sub> System