Pressureless sintering of (ZrB2–SiC–B4C) composites with (Y2O3+Al2O3) additions

Krishnarao, R. V.; Alam, Zafir; Das, Dipak K.; Prasad, V.V. Bhanu; Reddy, G. Madhusudan

doi:10.1016/j.ijrmhm.2015.05.013

Cited by 24 publications

(5 citation statements)

References 47 publications

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“…For the 12 wt% sintering aid content, the observed obvious YAG peak suggests the growth of liquid phase content with the increase in mass fraction of the sintering additives, indicating that the higher YAG content was obtained from Al 2 O 3 -Y 2 O 3 with an increase in content from 8 wt% to 12 wt%. 26,27 increase densification rate of SiC CMC by generating YAG liquid phase at 1850 • C. 28 Moreover, the type of secondary phase generated by sintering addtives also had a significant effect on the microstructure as well as the mechanical properties of the SiC composites. 29 In addition, the α-SiC phase is observed in the three samples, probably due to the transformation of SiC from β to α during sintering.…”

Section: Effects Of Sintering Additive Content On Mechanical Properti...mentioning

confidence: 99%

Microstructure and strengthening behavior in high content SiC nanowires reinforced SiC composites

et al. 2023

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In this study, the high-content SiC nw reinforced SiC ceramic matrix composites (SiC nw /SiC CMC) were successfully fabricated by hot pressing β-SiC and sintering additive (Al 2 O 3 -Y 2 O 3 ) with boron nitride interphase modification SiC nw . The effects of sintering additive content and mass fraction (5-25 wt%) of SiC nw on the density, microstructure, and mechanical properties of the composites were investigated. The results showed that with the increase of sintering additives from 10 wt% to 12 wt%, the relative density of the SiC nw /SiC CMC increased from 97.3% to 98.9%, attributed to the generated Y 3 Al 5 O 12 (YAG) liquid phase from the Al 2 O 3 -Y 2 O 3 that promotes the rearrangement and migration of SiC grains. The comprehensive performance of the obtained composite with 15 wt% SiC nw possessed the optimal flexural strength and fracture toughness of 524 ± 30.24 MPa and 12.39 ± 0.49 MPa⋅m 1/2 , respectively. Besides, the fracture mode of the composites with 25 wt% SiC nw content revealed a pseudo-plastic fracture behavior. It concludes that the 25 wt% SiC nw /SiC CMC was toughened by the fiber pull-outs, debonding, bridging, and crack deflection that can consume plenty of fracture energy. The strategy of SiC nanowires worked as a main bearing phase for the fabrication of SiC/SiC CMC providing critical information for understanding the mechanical behavior of high toughness and high strength SiC nanoceramic matrix composites.

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Section: Effects Of Sintering Additive Content On Mechanical Properti...mentioning

confidence: 99%

Microstructure and strengthening behavior in high content SiC nanowires reinforced SiC composites

et al. 2023

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“…Si 3 N 4 is one of the additives which has the most impact on the structural properties of ZrB 2 -SiC composite. By the way, the exact impacts of Si 3 N 4 on various characteristics of hot-pressed ZrB 2 -SiC materials have not been investigated thoroughly [10,11]. Liu et al [12] investigated the improved mechanical properties of laminated ZrB 2 -SiC composites with interfacial porous Si 3 N 4 .…”

Section: Introductionmentioning

confidence: 99%

Role of Si3N4 on microstructure and hardness of hot-pressed ZrB2−SiC composites

et al. 2021

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The impact of Si3N4 content on the hardness and microstructural developments of ZrB2-SiC material has been investigated thoroughly in the present investigation. Having prepared the raw materials in a jar mill, the ZrB2-SiC samples containing various amounts of Si3N4 were hot-pressed at 1850 °C. Furthermore, XRD, FESEM, and HRTEM were utilized to evaluate the microstructure of samples. The formation of in-situ h-BN was proved by the mentioned methods. Also, it was shown that the Vickers hardness of ZrB2-SiC increases up to 20 GPa in presence of 4.5 wt% Si3N4 which is 3 GPa more than the sample without Si3N4. Results show that the positive effect of increased relative density on hardness is more than the negative effect of h-BN soft phase formation.

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“…In particular, ZrB2 had the lowest theoretical density among all UHTC materials, which made ZrB2-based ceramic materials the most attractive materials for aerospace applications [5][6][7][8]. The density, mechanical properties and thermophysical properties of ZrB2 -based ceramic materials had been improved significantly [9][10][11]. Among them, ZrB2 ceramics with 20%SiC added had the best mechanical properties [2,4,7,9].…”

Section: Introductionmentioning

confidence: 99%

“…The density, mechanical properties and thermophysical properties of ZrB2 -based ceramic materials had been improved significantly [9][10][11]. Among them, ZrB2 ceramics with 20%SiC added had the best mechanical properties [2,4,7,9]. In high-temperature complex environments such as aerospace, UHTC materials could play an important role in reducing heat transfer as a protective shell with good thermal insulation performance [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Addition of Short Carbon Fiber on Thermal Insulation Properties of ZrB<sub>2</sub>- SiC Hot-Pressed Ceramics

Sun

Liu

et al. 2020

MSF

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Short carbon fibers reinforced ZrB2-SiC ceramics were prepared by hot pressing sintering process. The short carbon fibers with different volume fractions (0.2.4.6.8.10.20) were added for improving the thermal insulation properties of ZrB2-SiC ceramics. The experimental results showed that as the content of short carbon fiber increased, the thermal diffusivity decreased from 43.9m2/s to 32.9m2/s, the thermal conductivity decreased from 104.3 W/(m·K) to 72.9 W/(m·K) and thermal insulation performance reduced by 43.1%, respectively. The enhancement of the thermal insulation properties is mainly due to high interfacial thermal resistance of short carbon fiber and matrix.

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Pressureless sintering of (ZrB2–SiC–B4C) composites with (Y2O3+Al2O3) additions

Cited by 24 publications

References 47 publications

Microstructure and strengthening behavior in high content SiC nanowires reinforced SiC composites

Microstructure and strengthening behavior in high content SiC nanowires reinforced SiC composites

Role of Si3N4 on microstructure and hardness of hot-pressed ZrB2−SiC composites

Effect of the Addition of Short Carbon Fiber on Thermal Insulation Properties of ZrB<sub>2</sub>- SiC Hot-Pressed Ceramics

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