The mechanical performance of alumina as a function of grain size

Tuan, Wei‐Hsing; Lai, Ming-Yang; Lin, Mao‐Chao; Chan, Che Chang; Chiu, S. C.

doi:10.1016/0254-0584(94)90037-x

Cited by 18 publications

(6 citation statements)

References 13 publications

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“…When comparing the measured flexure strength and fracture toughness values it is worth noting that the 96% alumina was taken from a batch of alumina without a certification sheet. It was observed that the flexure strength was found to be highest for the alumina with the smallest grain size which is typical of what is reported in the literature [25], but it's fracture toughness was found to be the lowest of all three types of alumina. Since we have such low statistics from the CN method it is difficult to compare measured fracture toughness against the other two methods.…”

Section: Characterization: Optical Microscopy Esem X-ray Mapping Tsupporting

confidence: 80%

Laser notching ceramics for reliable fracture toughness testing

Carlton

Elmer

Freeman

et al. 2016

Journal of the European Ceramic Society

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A new method for notching ceramics was developed using a picosecond laser for fracture toughness testing of alumina samples. The test geometry incorporated a singleedge-V-notch that was notched using picosecond laser micromachining. This method has been used in the past for cutting ceramics, and is known to remove material with little to no thermal effect on the surrounding material matrix. This study showed that laser-assisted-machining for fracture toughness testing of ceramics was reliable, quick, and cost effective. In order to assess the laser notched single-edge-V-notch beam method, fracture toughness results were compared to results from other more traditional methods, specifically surface-crack in flexure and the chevron notch bend tests. The results showed that picosecond laser notching produced precise notches in post-failure measurements, and that the measured fracture toughness results showed improved consistency compared to traditional fracture toughness notching methods.

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Section: Characterization: Optical Microscopy Esem X-ray Mapping Tsupporting

confidence: 80%

Laser notching ceramics for reliable fracture toughness testing

Carlton

Elmer

Freeman

et al. 2016

Journal of the European Ceramic Society

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“…the average modulus increases with the grain size (Figure 5.9). This is consistent with the findings on the fracture toughness of alumina ceramics; the toughness increases with the grain size when the size is less than 4 µm[163].…”

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confidence: 92%

On the characterization of mechanical properties of alumina ceramics for high speed application

Wang¹

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“…The values in Table 1 demonstrate that the hardness of each phase follows the order as Al 2 O 3 > BaAl 13.2 O 20.8 > Ba 4 (Ti 0.833 Al 0.167 ) 12 O 27 > BaTiO 3 . A previous study also indicated that the strength of BaTiO 3 is lower than that of Al 2 O 3 [ 10 ]. Different from the previous studies on SiC-platelet toughened Al 2 O 3 [ 2 , 3 , 4 ], the platelets used in the present study are much weaker than the matrix.…”

Section: Resultsmentioning

confidence: 99%

Feasibility of Using Multilayer Platelets as Toughening Agents

Chin

Tuan

2009

Materials

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It is known that the toughness of brittle ceramics can be improved significantly with the addition of hard platelets. In the present study, platelet-shape multilayer ceramic laminates are utilized as a toughening agent for alumina ceramics. They are prepared by laminating the BaTiO3-based ceramic tapes. Although the elastic modulus of the BaTiO3-based platelets is lower than that of the alumina matrix, and the platelets are also reactive to alumina at elevated temperatures, the weak platelets are found to exhibit the ability to deflect major matrix cracks by forming a large number of microcrack branches within the platelets, thus achieving the desired toughening effect.

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The mechanical performance of alumina as a function of grain size

Cited by 18 publications

References 13 publications

Laser notching ceramics for reliable fracture toughness testing

Laser notching ceramics for reliable fracture toughness testing

On the characterization of mechanical properties of alumina ceramics for high speed application

Feasibility of Using Multilayer Platelets as Toughening Agents

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