Enhanced bending strength and microwave dielectric properties of Li2MgTi3O8 ceramics by adding Si3N4 reinforcing phase

Qu, Xin; Deng, Shan; Ma, Zhiqiang; Xiao, Yaqi; Li, Qing; Dai, Zhengli; He, Guoqiang; Liu, Kaiyang; Chen, Xiuli; Wu, You; Zhou, Huanfu

doi:10.1016/j.ceramint.2022.06.215

Cited by 9 publications

(4 citation statements)

References 37 publications

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“…With the increase of (Ni 1/3 Nb 2/3 ) 4+ substitution (0.03 ≤ x ≤ 0.15), the bulk densities at all temperatures reach the maximum value at x = 0.09 (4.748 g/cm 3 ∼ 1190 °C, 4.992 g/cm 3 ∼ 1250 °C, and 4.952 g/cm 3 ∼ 1310 °C). Calculations based on eqs S1 and S2 , show that the relative densities also reach their highest values at x = 0.09 (90.9% ∼ 1190 °C, 95.6% ∼ 1250 °C, and 94.8% ∼ 1310 °C). These phenomena indicate that the internal structure of the BTN ∼ NN ceramics is densest at x = 0.09 (4.992 g/cm 3 , 94.88% ∼ 1250 °C).…”

Section: Resultsmentioning

confidence: 99%

(Ni_1/3Nb_2/3)⁴⁺-Improved High-K Ba₃Ti₄Nb₄O₂₁ Microwave Dielectric Ceramics for Miniaturized All-Ceramic Radomes with 5G Beam-Splitting Function

Tang,

Ye,

Hua

et al. 2024

Inorg. Chem.

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With the rapid development of 5G communication technology, microwave dielectric ceramics with high dielectric constants are very conducive to the miniaturization of passive devices. Here, Ba 3 Ti 4−x (Ni 1/3 Nb 2/3 ) x Nb 4 O 21 (BTN ∼ NN, 0.03 ≤ x ≤ 0.15) ceramics with hexagonal phases are synthesized via the solid-phase route. The composite (Ni 1/3 Nb 2/3 ) 4+ ion substitution strategy can substantially improve the microwave dielectric properties of the Ba 3 Ti 4 Nb 4 O 21 (BTN) ceramic. The ε r and Q × f values depend on the ionicity (Nb−O bonds) and lattice energies (Nb(1)−O3 and Nb(1)−O2(1) bonds). The microwave dielectric properties of the BTN ∼ NN (x = 0.09) ceramic sintered at 1250 °C are ε r = 60.3, Q × f = 22073 GHz, and τ f = 78.1 ppm/°C. A miniaturized all-ceramic radome (@400 mm × 400 mm × 8 mm) for 5G beam-splitting function is designed and demonstrated using this ceramic. Compared to other radomes designed for other work utilizing low ε r , the size of this radome has been reduced by 3/7. The reflection coefficients of the beam splitting function are all 0.73, and the phase shifts are all 360°. This work contributes to the development of miniaturized passive devices from a materials point of view.

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Section: Resultsmentioning

confidence: 99%

(Ni_1/3Nb_2/3)⁴⁺-Improved High-K Ba₃Ti₄Nb₄O₂₁ Microwave Dielectric Ceramics for Miniaturized All-Ceramic Radomes with 5G Beam-Splitting Function

Tang,

Ye,

Hua

et al. 2024

Inorg. Chem.

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“…In comparison, simulation calculations for the insulator, subjected to a maximum load of 550 KN, show a peak value of the first principal stress in the porcelain shell section at 94.549 MPa, differing by 5.49%. Notably, ceramics, being inherently brittle with limited plasticity, exhibit a bending strength that is times higher than the benchmark strength [34][35][36][37][38], which results from a trade-off between the bending strength and fracture toughness [39,40]. Therefore, it can be inferred that the insulator's failure occurs when the ceramic material exceeds its bending strength limit.…”

Section: Verification Of Simulation Stressmentioning

confidence: 99%

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Ji,

Li,

Cao

et al. 2024

Materials

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This study aims to enhance the productivity of high-voltage transmission line insulators and their operational safety by investigating their failure mechanisms under ultimate load conditions. Destructive tests were conducted on a specific type of insulator under ultimate load conditions. A high-speed camera was used to document the insulator’s failure process and collect strain data from designated points. A simulation model of the insulator was established to predict the effects of ultimate loads. The simulation results identified a maximum first principal stress of 94.549 MPa in the porcelain shell, with stress distribution characteristics resembling a cantilever beam subjected to bending. This implied that the insulator failure occurred when the stress reached the bending strength of the porcelain shell. To validate the simulation’s accuracy, bending and tensile strength tests were conducted on the ceramic materials constituting the insulator. The bending strength of the porcelain shell was 100.52 MPa, showing a 5.6% variation from the simulation results, which indicated the reliability of the simulation model. Finally, optimization designs on the design parameters P1 and P2 of the insulator were conducted. The results indicated that setting P1 to 8° and P2 to 90.062 mm decreased the first principal stress of the porcelain shell by 47.6% and Von Mises stress by 31.6% under ultimate load conditions, significantly enhancing the load-bearing capacity. This research contributed to improving the production yield and safety performance of insulators.

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“…1–3 In a previous study, LMT ceramics exhibited relatively excellent microwave dielectric properties when sintered at 1050 °C: ε r = 24.58, Q × f = 60 065 GHz, and τ f = −6.65 ppm °C −1 . 4 However, their high sintering temperature and poor flexural strength (99.534 MPa) make them impossible to be used in LTCC ceramic substrate devices. 5,6…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] In a previous study, LMT ceramics exhibited relatively excellent microwave dielectric properties when sintered at 1050 1C: e r = 24.58, Q Â f = 60 065 GHz, and t f = À6.65 ppm 1C À1 . 4 However, their high sintering temperature and poor flexural strength (99.534 MPa) make them impossible to be used in LTCC ceramic substrate devices. 5,6 Most researchers have found that TiN has a high melting point (approximately 3200 K), excessive hardness (approximately 21 GPa) and good chemical stability, which can help improve the mechanical properties of ceramics.…”

Section: Introductionmentioning

confidence: 99%

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

Deng,

Qu,

Gao

et al. 2023

J. Mater. Chem. C

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Enhanced bending strength and microwave dielectric properties of Li2MgTi3O8 ceramics by adding Si3N4 reinforcing phase

Cited by 9 publications

References 37 publications

(Ni_1/3Nb_2/3)⁴⁺-Improved High-K Ba₃Ti₄Nb₄O₂₁ Microwave Dielectric Ceramics for Miniaturized All-Ceramic Radomes with 5G Beam-Splitting Function

(Ni_1/3Nb_2/3)⁴⁺-Improved High-K Ba₃Ti₄Nb₄O₂₁ Microwave Dielectric Ceramics for Miniaturized All-Ceramic Radomes with 5G Beam-Splitting Function

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

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Enhanced bending strength and microwave dielectric properties of Li2MgTi3O8 ceramics by adding Si3N4 reinforcing phase

Cited by 9 publications

References 37 publications

(Ni1/3Nb2/3)4+-Improved High-K Ba3Ti4Nb4O21 Microwave Dielectric Ceramics for Miniaturized All-Ceramic Radomes with 5G Beam-Splitting Function

(Ni1/3Nb2/3)4+-Improved High-K Ba3Ti4Nb4O21 Microwave Dielectric Ceramics for Miniaturized All-Ceramic Radomes with 5G Beam-Splitting Function

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Enhanced flexural strength and microwave dielectric properties of Li2MgTi3O8-based low temperature co-fired ceramics

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Product

Resources

About

(Ni_1/3Nb_2/3)⁴⁺-Improved High-K Ba₃Ti₄Nb₄O₂₁ Microwave Dielectric Ceramics for Miniaturized All-Ceramic Radomes with 5G Beam-Splitting Function

(Ni_1/3Nb_2/3)⁴⁺-Improved High-K Ba₃Ti₄Nb₄O₂₁ Microwave Dielectric Ceramics for Miniaturized All-Ceramic Radomes with 5G Beam-Splitting Function

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics