Microstructure and mechanical properties of h-BN/Y2SiO5 composites

Zhang, Xi; Chen, Jixin; Li, Xichao; Zhang, Jie; Wan, Detian; Zhou, Yanchun

doi:10.1016/j.ceramint.2014.09.058

Cited by 35 publications

(13 citation statements)

References 18 publications

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“…Meanwhile, the compressive strength of the composites tends to increase linearly. It could be seen that h-BN/Yb 4 Si 2 O 7 N 2 composites possess higher strength than pure h-BN ceramic (75.8 MPa for flexural strength and 124.1 MPa for compressive strength) [15], and many other reported h-BN based composites, such as h-BN/Y 2 SiO 5 [20], h-BN/Y 2 Si 2 O 7 [16], h-BN/SiAlON [17], and Y 4 Si 2 O 7 N 2 /h-BN [21].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…For example, the flexural strength and compressive strength of pure h-BN ceramic are only 75.8 and 124.1 MPa, respectively [15]. It has been shown that the incorporation of a secondary phase is an effective way to enhance the mechanical properties of the h-BN matrix [16][17][18][19][20].…”

Section: Introduction mentioning

confidence: 99%

“…It was demonstrated that the flexural strength could be increased by increasing the content of additive. Similarly, the mechanical properties, especially at high temperatures, were improved by introducing Y 2 SiO 5 phase to the h-BN matrix [19,20]. In addition to these, Y 4 Si 2 O 7 N 2 -BN composites were also studied [21].…”

Section: Introduction mentioning

confidence: 99%

“…Figure 2shows typical backscattered electron images of polished surfaces and corresponding secondary electron morphologies of fracture surfaces of the composites containing20 and 50 vol% Yb 4 Si 2 O 7 N 2 . By the result of XRD, there are h-BN, Yb 4 Si 2 O 7 N 2 , and Yb 2 SiO 5 phases in the sample BYb20, but Yb 4 Si 2 O 7 N 2 and Yb 2 SiO 5 cannot be effectively differentiated by SEM and EDX, as shown in…”

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confidence: 99%

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Microstructure and mechanical properties of h-BN/Yb4Si2O7N2 composites

Chen

Zhang

et al. 2018

J Adv Ceram

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A series of h-BN based composites with Yb 4 Si 2 O 7 N 2 as a secondary phase were successfully synthesized by an in situ reaction hot pressing method. It was found that the relative density and room-temperature mechanical properties monotonically increased with increasing the content of Yb 4 Si 2 O 7 N 2 from 20 to 50 vol%. When 50 vol% Yb 4 Si 2 O 7 N 2 was introduced, the relative density of the composite reached 98.75%, and its flexural strength, compressive strength, fracture toughness, and hardness reached 338±10 MPa, 803±49 MPa, 2.06±0.06 MPa•m 1/2 , and 2.69±0.10 GPa, respectively. The strengthening effect of Yb 4 Si 2 O 7 N 2 was mainly attributed to its high modulus and high hardness. Fine microstructure was also advantageous to strength and could lead to more tortuous crack propagation paths and then improve the fracture toughness of the composites simultaneously. Meanwhile, the composites maintained good machinability.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

mentioning

confidence: 99%

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Microstructure and mechanical properties of h-BN/Yb4Si2O7N2 composites

Chen

Zhang

et al. 2018

J Adv Ceram

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“…There have been some researches on the microstructural evolution during sintering and the properties of h-BN ceramics [17][18][19][20][21]. Zhuo Zhang et al obtained h-BN powders composed of amorphous and nanocrystalline BN by ball milling, and then sintered them under different temperatures and pressures.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of H-BN Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2 Glass Phase During Hot Pressing

Qiu

Duan

Zhang

et al. 2020

Preprint

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BN-La2O3-Al2O3-SiO2 composite ceramics were fabricated by hot press sintering using h-BN, La2O3, Al2O3 and amorphous SiO2 as the raw materials. The effects of sintering temperature on the microstructural evolution, bulk density, apparent porosity, and mechanical properties of h-BN composite ceramics were investigated. The results indicated that ternary La2O3-Al2O3-SiO2 liquid phase was formed during sintering process, which provided an environment for the growth of h-BN grains. With increasing sintering temperature, the cristobalite phase precipitation and h-BN grain growth occurred at the same time, which had the significant influence on the densification and mechanical properties of h-BN composite ceramics. The best mechanical properties of BN-La2O3-Al2O3-SiO2 composite ceramics were obtained under sintering temperature of 1700 °C, and the elastic modulus, flexural strength, and fracture toughness were 80.5 GPa, 266.4 MPa and 3.25 MPa·m1/2, respectively.

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Influence of sintering pressure on the crystallization and mechanical properties of BN-MAS composite ceramics

et al. 2015

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Microstructure and mechanical properties of h-BN/Y2SiO5 composites

Cited by 35 publications

References 18 publications

Microstructure and mechanical properties of h-BN/Yb4Si2O7N2 composites

Microstructure and mechanical properties of h-BN/Yb4Si2O7N2 composites

Microstructural Evolution of H-BN Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2 Glass Phase During Hot Pressing

Influence of sintering pressure on the crystallization and mechanical properties of BN-MAS composite ceramics

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Microstructure and mechanical properties of h-BN/Y2SiO5 composites

Cited by 35 publications

References 18 publications

Microstructure and mechanical properties of h-BN/Yb4Si2O7N2 composites

Microstructure and mechanical properties of h-BN/Yb4Si2O7N2 composites

Microstructural Evolution of H-BN&nbsp;Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2&nbsp;Glass Phase During Hot Pressing

Influence of sintering pressure on the crystallization and mechanical properties of BN-MAS composite ceramics

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Microstructural Evolution of H-BN Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2 Glass Phase During Hot Pressing