Microwave transmission performance of fused silica ceramics in microwave high-temperature heating

Zhai, Di; Wei, Chu; Zhang, Fucheng; Shang, Xiaobiao; Chen, Junruo; Liu, Meihong; Peng, Jinhui

doi:10.1016/j.ceramint.2018.12.092

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…Quartz has the characteristics of stable physical and chemical properties, wide distribution, and low cost, 1 and has been widely used in construction, 2 aerospace, 3 optical fiber communication, 4 military, and other fields 5 . However, quartz is transformed into cristobalite with a large coefficient of volume expansion at high temperatures, resulting in strong internal stress and cracks in the material, which greatly reduces the safe use performance of the material 6 …”

Section: Introductionmentioning

confidence: 99%

Effect of BPO₄ on phase transition behavior and sintering of quartz materials

Li,

et al. 2023

Int J Applied Ceramic Tech

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In order to inhibit the phase transition of quartz, the effects of BPO4 addition and sintering temperature on the structure and properties of quartz materials were studied. The results showed that the addition of 5 wt.% BPO4 successfully inhibited the formation of cristobalite. Samples with 5 wt.% BPO4 added exhibited the high cold modulus of rupture (15.59 MPa) and bulk density (1.92 g/cm3) sintered at 1200°C–1400°C. In addition, BPO4 formed a glass phase sintered at 1200°C–1400°C and distributed between SiO2 particles, filling pores and densifying the material. Therefore, the prepared quartz‐based ceramics with BPO4 have broad potential in the field of medium and high temperatures, and can be applied to aerospace and other fields.

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Section: Introductionmentioning

confidence: 99%

Effect of BPO₄ on phase transition behavior and sintering of quartz materials

Li,

et al. 2023

Int J Applied Ceramic Tech

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“…Numerous researchers are devoting themselves to the reinforcement of the fused silica ceramics because the strength and as the fracture toughness of the pure fused silica ceramic are rather low 4–10 . Yang et al 11 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of Si ₃ N ₄ whisker‐reinforced SiO ₂ ceramic for radome materials

Huang

Peng

Zhang

et al. 2022

Int J Applied Ceramic Tech

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Fused silica ceramic has become one of the most widely used radome materials in the world since the 1970s. But its poor mechanical properties restricted its application to some extent. To improve the mechanical properties of the fused silica ceramic and keep its characteristic for radome materials, silicon nitride (Si3N4) whisker‐reinforced fused silica ceramics were prepared by a slip‐casting method in the work. The influence of Si3N4 whisker contents on the properties of the slurry was studied, indicating that the preferable pH values of the slurry were 4–6 and whisker contents were 10 wt.%. The flexural strength of as‐prepared Si3N4w/SiO2 ceramic was about 74.35 MPa, exhibiting an increase of 7.75% over that of the pure silica sample. Its dielectric constant in the range from 8 to 12 GHz and tanδ under 10 GHz were, respectively, 3.37 and .0011. It is of great interest to find that Si3N4w/SiO2 has excellent oxidization resistance and its mass maintains even at 1270°C.

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“…In this work, our aim is to develop a fully controlled microwave heating process to sinter low-loss dielectric refractory materials. For this purpose, a 915 MHz single-mode rectangular cavity was chosen as it provides a high volume chamber and, compared to the common and widely spread 2.45 GHz frequency, the 915 MHz one offers a larger penetration depth as discussed by Zhai [9]. In this work, an assembly consisting of a thermal insulation material, equipped with two SiC suscceptors plates, was used to sinter large size alumina in a 915 MHz cavity.…”

Section: Introductionmentioning

confidence: 99%

Microwave Sintering of Alumina at 915 MHz: Modeling, Process Control, and Microstructure Distribution

Manière

Bilot

et al. 2019

Materials

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Microwave energy can be advantageously used for materials processing as it provides high heating rates and homogeneous temperature field distribution. These features are partly due to the large microwave penetration depth into dielectric materials which is, at room temperature, a few centimeters in most dielectric materials. However, up to now, this technology is not widely spread for high-temperature material processing applications (>1200 °C), because its reproducibly and ability to sinter large size samples (>30 cm3) still needs to be improved. In this context, this paper describes both an empirically designed 915 MHz single-mode cavity made from SiC susceptors and refractory thermal insulation, and the 3D modeling of the process in order to improve our understanding of it. Different susceptors geometries and coupling slit position were numerically tested in order to better understand how these parameters impact the field homogeneity and the process stability. It was found that positioning the largest surface of the susceptors parallel to the electrical field allows a very uniform and hybrid heating of the material, while avoiding plasma or thermal instabilities. This was correlated to the 3D modeling results. Finally, thanks to a fully-automatized system this apparatus was used to sinter large size (~30 cm3) low-loss dielectric alumina samples. The sintered materials were subsequently characterized in terms of density, grain size distribution, and homogeneity. The reproducibility was also discussed, demonstrating the process efficiency and reliability.

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Microwave transmission performance of fused silica ceramics in microwave high-temperature heating

Cited by 13 publications

References 17 publications

Effect of BPO₄ on phase transition behavior and sintering of quartz materials

Effect of BPO₄ on phase transition behavior and sintering of quartz materials

Fabrication and characterization of Si ₃ N ₄ whisker‐reinforced SiO ₂ ceramic for radome materials

Microwave Sintering of Alumina at 915 MHz: Modeling, Process Control, and Microstructure Distribution

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Microwave transmission performance of fused silica ceramics in microwave high-temperature heating

Cited by 13 publications

References 17 publications

Effect of BPO4 on phase transition behavior and sintering of quartz materials

Effect of BPO4 on phase transition behavior and sintering of quartz materials

Fabrication and characterization of Si 3 N 4 whisker‐reinforced SiO 2 ceramic for radome materials

Microwave Sintering of Alumina at 915 MHz: Modeling, Process Control, and Microstructure Distribution

Contact Info

Product

Resources

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Effect of BPO₄ on phase transition behavior and sintering of quartz materials

Effect of BPO₄ on phase transition behavior and sintering of quartz materials

Fabrication and characterization of Si ₃ N ₄ whisker‐reinforced SiO ₂ ceramic for radome materials