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

Cai, Delong; Yang, Zhihua; Duan, Xiaoming; Zhang, Qian; Li, Qian; Li, Quan; Sun, Yinyong; Jia, Dechang; Zhou, Yu

doi:10.1007/s10853-015-9531-x

Cited by 21 publications

(15 citation statements)

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“…With the increase of raw h-BN particle size, h-BN grains tended to orientate with the direction perpendicular to the hot-pressing direction, and the densification effect of MAS phase on BN-MAS composite ceramics decreased with increasing raw h-BN particle size due to the uneven dispersion of MAS phase [26,29]. Cai et al [30][31][32] researched the influence of sintering process on the BN-MAS composite ceramics. The sintering pressure had a great influence not only on the mechanical properties of composite ceramics, but also on the crystallization of MAS and structural order of h-BN.…”

Section: Introduction mentioning

confidence: 99%

“…The nucleophilic attack of N on M (M = Mg 2+ , Al 3+ , and Si 4+ ) and the electrophilic attack of B on O were the crucial factors on the formation of amorphous MAS phase. In addition, chemical bonding was formed between h-BN and MAS, and the matrix atoms diffused into the h-BN layers, leading to a strong bonding interface [30][31][32].…”

Section: Introduction mentioning

confidence: 99%

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Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

et al. 2021

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BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride (h-BN), lanthanum oxide (La2O3), aluminia (Al2O3), and amorphous silica (SiO2) as the raw materials. The effects of sintering temperature on microstructural evolution, bulk density, apparent porosity, and mechanical properties of the h-BN composite ceramics were investigated. The results indicated that La-Al-Si-O 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 a significant influence on the densification and mechanical properties of h-BN composite ceramics. The best mechanical properties of BN/La-Al-Si-O composite ceramics were obtained under the sintering temperature of 1700 °C. 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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Section: Introduction mentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

et al. 2021

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“…The nucleophilic attack of N on M (M = Mg 2+ , Al 3+ and Si 4+ ) and the electrophilic attack of B on O were the crucial factors on the formation of amorphous MAS phase. In addition, chemical bonding was formed between h-BN and MAS and the matrix atoms diffused into the h-BN layer, leading to a strong bonding interface [30][31][32].…”

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

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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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“…However, the use of single‐phase h ‐BN materials for high‐temperature structural applications is rather limited because of poor sinterability and weak oxidation resistance as well as relatively poor lower mechanical properties . Therefore, the densification and mechanical properties of h ‐BN combined with second phase have been studied in the past decades …”

Section: Introductionmentioning

confidence: 99%

“…5,6 Therefore, the densification and mechanical properties of h-BN combined with second phase have been studied in the past decades. 7,8 Although enhanced mechanical performance of h-BNbased ceramics is a crucial step forward, to make it an attractive choice under extreme environmental conditions, several properties are still need to be improved. 1,9,10 As a thermal protection component of high-speed vehicles, they served in an oxidizing environment of high velocity dissociated air, which are susceptible to catastrophic failure under severe thermal stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnesium aluminum silicate glass on the thermal shock resistance of BN matrix composite ceramics

et al. 2017

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The effects of magnesium aluminum silicate (MAS) glass on the thermal shock resistance and the oxidation behavior of h‐BN matrix composites were systematically investigated at temperature differences from 600°C up to 1400°C. The retained strength rate of the composites rose with the increasing content of MAS showing a maximum value at the 60 wt% MAS. Compared with the original strength, the retained strength of the specimen after thermal shock increased to 77% (ΔT=1000°C). The strengthening effect of MAS and the surface microstructural evolution of composites are responsible for the improved thermal shock resistance. Surface oxidation of the composites during the thermal shock process plays a positive role in enhancing the retained strength by self‐healing cracks and the appearance of the compressive stress. The oxide layer also acted as a thermal barrier to decelerate the actual thermal stress. Furthermore, this dense layer also improved the oxidation resistance of h‐BN matrix composites by prevent diffusion of oxygen. These results indicated that short‐term surface oxidation during thermal shock process is favorable to the enhancement of the thermal shock resistance of BN‐MAS composite ceramics.

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

Cited by 21 publications

References 32 publications

Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

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

Effect of magnesium aluminum silicate glass on the thermal shock resistance of BN matrix composite ceramics

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

Cited by 21 publications

References 32 publications

Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

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

Effect of magnesium aluminum silicate glass on the thermal shock resistance of BN matrix composite ceramics

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