LaPO4 as a toughening agent for rare earth zirconate ceramics

Wang, Caimei; Guo, Liu; Ye, Fuxing

doi:10.1016/j.matdes.2016.09.014

Cited by 21 publications

(4 citation statements)

References 37 publications

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“…It can be noted in particular tha the doping amounts were YT3 and YT4, the fluorite and M-YTaO4 grains in the com were close in size. According to percolation theory, there is a critical range of the vol% second phase volume fraction in the two-phase composites beyond which t ond phase interconnection effect occurs [26,27]. In the present study, the M-YTaO4 c was significantly higher than this range, which is why this phenomenon occurre thermore, other studies have shown [28,29] that doping the second phase can ref grain size of the matrix phase and enhance the mechanical properties of the compo…”

Section: Microstructure Characterizationmentioning

confidence: 43%

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Mechanical Properties and Toughening Mechanisms of Promising Zr-Y-Ta-O Composite Ceramics

Zhang

Zhu

et al. 2023

Coatings

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ZrO2-YO1.5-TaO2.5 (ZYTO) composite ceramics are considered to be a candidate for next-generation thermal barrier coatings (TBCs) due to their excellent thermal stability and low thermal conductivity in high temperatures; however, the mechanical properties and fracture toughness of the ZYTO system may be shortcomings compared with 7-8YSZ: the traditional TBC. In this study, ZYTO composite ceramics were successfully prepared by chemical coprecipitation reaction, and the microstructure of resulting composites was studied as a function of the doping of M-YTaO4. Mechanical properties, including the density, porosity, hardness and Young’s modulus, were all determinate; the toughening mechanism was verified by the crack growth behavior of the Vickers indentation test. The results suggest that M-YTaO4 refined the fluorite phase grain and strengthened the grain interface in the composite ceramic. The thermal mismatch between the second phase and matrix produced residual stress in the bulk and affected the crack propagation behavior. With the increase in M-YTaO4 doping, the grain coarsening and ferroelastic domains were observed in the experiments. The ferroelastic domains with orthogonal polarization directions near the crack tip evidenced the ferroelastic toughening mechanism. The competition among these crack behaviors, such as crack deflection, bridging and bifurcation, dominated the actual fracture toughness of the composite. The best toughening formula was determined in the two-phase region, and the highest indentation fracture toughness was about 42 J/m2, which was very close to 7-8YSZ’s 45 ± 5 J/m2.

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Section: Microstructure Characterizationmentioning

confidence: 43%

“…Obviously, Young's modulus is measured by a value lower than the calculated value. However, Voigt believed that strengthening interface bonding meant increasing Young's modulus [26]. Figure 10 shows that the measured value first increased and then decreased, reaching a maximum value at YT2.…”

Section: 𝐸 = 𝑥𝐸 +(1 − 𝑥) 𝐸mentioning

confidence: 98%

Mechanical Properties and Toughening Mechanisms of Promising Zr-Y-Ta-O Composite Ceramics

Zhang

Zhu

et al. 2023

Coatings

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“…The sharp Raman peaks in the range of 394-617 cm −1 derived from O─P─O bending vibration. [35,36] The characteristic Raman peaks at 966 and 989 cm −1 were related to the symmetric stretching vibration of PO 4 group. [35,36] The Raman peaks above 1000 cm −1 were associated with the asymmetric stretching vibration of PO 4 group.…”

Section: Resultsmentioning

confidence: 99%

“…[35,36] The characteristic Raman peaks at 966 and 989 cm −1 were related to the symmetric stretching vibration of PO 4 group. [35,36] The Raman peaks above 1000 cm −1 were associated with the asymmetric stretching vibration of PO 4 group. [35] These results revealed that crystallization occurred in the core layer and the precipitated crystalline phase in this hybridized preform was relevant to PO 4 group.…”

Section: Resultsmentioning

confidence: 99%

Er‐Activated Hybridized Glass Fiber for Broadband Telecommunication

Wei,

Chen,

et al. 2023

Adv Materials Technologies

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With the rapid development of 5G networks, the Internet of Things, and new‐generation of AI, there are considerable demands on expanding the capacity of contemporary optical fiber communication systems. One of the most effective avenues involves the extension of the bandwidth of Er‐doped fiber amplifiers, but with limited success. Herein, an Er‐activated hybridized glass fiber are reported, which can help realize broadband telecommunication. The effect of element hybridization on the bandwidth of Er‐activated fiber is clarified and the structure‐optical response relationship is established. A two‐step deposition approach is proposed to overcome the immiscibility barrier of different hybridized elements, and Er‐activated fiber with uniform doping is constructed. The activated fiber presents excellent compatibility with commercial telecommunication systems, providing a small signal gain of >13 dB in the whole L‐band range and a maximum gain of 28 dB. Furthermore, the Er‐activated fiber amplifier device is successfully developed. It exhibits outstanding optical amplification performance with gain >24 dB in the range of 1580–1624 nm, gain fluctuation less than ±0.9 dB, and noise figure <6.5 dB. The results not only provide a new strategy for developing novel active broadband optical fibers, but a valuable solution for new‐generation large‐capacity optical fiber communication systems.

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Toughening Mechanism of Thermal Barrier Coatings

Chen

Zhang

et al. 2021

Int J Thermophys

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LaPO4 as a toughening agent for rare earth zirconate ceramics

Cited by 21 publications

References 37 publications

Mechanical Properties and Toughening Mechanisms of Promising Zr-Y-Ta-O Composite Ceramics

Mechanical Properties and Toughening Mechanisms of Promising Zr-Y-Ta-O Composite Ceramics

Er‐Activated Hybridized Glass Fiber for Broadband Telecommunication

Toughening Mechanism of Thermal Barrier Coatings

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