Controllability of the pore characteristics of B4C/C preform prepared by gel-casting and the properties of RBBC composites

Ren, Quanxing; Feng, Dong; Ru, Hongqiang; Jiang, Yan; Ye, Chaochao; Zhang, Yu; Wang, Wei; Zhang, Cuiping

doi:10.1016/j.ceramint.2019.07.303

Cited by 8 publications

(10 citation statements)

References 40 publications

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“…The EDS spectroscopic analysis depicted that the silicon infiltrated composites were composed primarily of boron, silicon, and carbon, thereby demonstrating that the composites obtained following silicon infiltration comprised boron carbide and silicon carbide along with some content of silicon. It can therefore be assumed that the liquid silicon infiltrated into the interior of the composite and produce silicon carbide upon reaction with boron carbide, according to the following reaction equations [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]: 5 Si + 3 B 4 C = 3 SiC + 2 SiB 6 2 Si + B 4 C = SiC + SiB 4 …”

Section: Resultsmentioning

confidence: 99%

“…The liquid silicon underwent a chemical reaction with graphite producing silicon carbide as shown by the following chemical reactions [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]: Si + C = SiC …”

Section: Resultsmentioning

confidence: 99%

“…Because the pressureless sintered B 4 C/C(graphite) composites have a porosity of about 25–38%, the liquid silicon could be conveniently infiltrated into the interior of the composites [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ], subsequently reacting with B 4 C and graphite to produce the silicon carbide [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. While the boron carbide reacted only partially [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ], the graphite reacted completely with silicon producing silicon carbide [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ]. The residual boron carbide and silicon existed within the matrix of the composite [ 40 , 41 , 42 , 43 , 44 , 45 , 46 <...…”

Section: Introductionmentioning

confidence: 99%

“…While the boron carbide reacted only partially [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ], the graphite reacted completely with silicon producing silicon carbide [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ]. The residual boron carbide and silicon existed within the matrix of the composite [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ] and together with silicon carbide gave rise to the B 4 C-SiC-Si composites [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. The pressureless sintered B 4 C/C(graphite) composites are thus transformed into the B 4 C-SiC-Si composites via the silicon infiltration process [ 40 ,…”

Section: Introductionmentioning

confidence: 99%

“…The residual boron carbide and silicon existed within the matrix of the composite [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ] and together with silicon carbide gave rise to the B 4 C-SiC-Si composites [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. The pressureless sintered B 4 C/C(graphite) composites are thus transformed into the B 4 C-SiC-Si composites via the silicon infiltration process [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. The microstructural details, phase composition, and mechanical characteristics of the B 4 C/C(graphite) composites as well as B 4 C-SiC-Si composites fabricated by the silicon infiltration process were then investigated and compared.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Microstructural Features and Mechanical Characteristics of the Pressureless Sintered B4C/C(Graphite) Composites and the B4C-SiC-Si Composites Fabricated by the Silicon Infiltration Process

Jiang

2022

Materials

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The B4 C/C(graphite) composites were fabricated by employing a pressureless sintering process. The pressureless sintered B4 C/C(graphite) composites exhibited extremely low mechanical characteristics. The liquid silicon infiltration technique was employed for enhancing the mechanical property of B4 C/C(graphite) composites. Since the porosity of the B4 C/C(graphite) composites was about 25–38%, the liquid silicon was able to infiltrate into the interior composites, thereby reacting with B4 C and graphite to generate silicon carbide. Thus, boron carbide, silicon carbide, and residual silicon were sintered together forming B4 C-SiC-Si composites. The pressureless sintered B4 C/C(graphite) composites were transformed into the B4 C-SiC-Si composites following the silicon infiltration process. This work comprises an investigation of the microstructure, phase composition, and mechanical characteristics of the pressureless sintered B4 C/C(graphite) composites and B4 C-SiC-Si composites. The XRD data demonstrated that the pressureless sintered bulks were composed of the B4 C phase and graphite phase. The pressureless sintered B4 C/C(graphite) composites exhibited a porous microstructure, an extremely low mechanical property, and low wear resistance. The XRD data of the B4 C-SiC-Si specimens showed that silicon infiltrated specimens comprised a B4 C phase, SiC phase, and residual Si. The B4 C-SiC-Si composites manifested a compact and homogenous microstructure. The mechanical property of the B4 C-SiC-Si composites was substantially enhanced in comparison to the pressureless sintered B4 C/C(graphite) composites. The density, relative density, fracture strength, fracture toughness, elastic modulus, and Vickers hardness of the B4 C-SiC-Si composites were notably enhanced as compared to the pressureless sintered B4 C/C(graphite) composites. The B4 C-SiC-Si composites also manifested outstanding resistance to wear as a consequence of silicon infiltration. The B4 C-SiC-Si composites demonstrated excellent wear resistance and superior mechanical characteristics.

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