scholarly journals Optimal preparation of high-entropy boride-silicon carbide ceramics

2020 ◽  
Author(s):  
Yan Zhang ◽  
Shi-Kuan Sun ◽  
Wei-Ming Guo ◽  
Liang Xu ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Carbothermal Reduction ◽  
Powder Processing ◽  
Full Density ◽  
High Entropy ◽  
Sic Ceramics ◽  
Reduction Methods ◽  
Borothermal Reduction ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Abstract High-entropy boride-silicon carbide (HEB-SiC) ceramics were fabricated by using boride-based powders prepared from borothermal and boro/carbothermal reduction methods. The effects of processing routes (borothermal reduction and boro/carbothermal reduction) of HEB powders were examined. HEB-SiC ceramics with nearly relatively full density (>98%) were prepared by spark plasma sintering at 2000oC. It was demonstrated that the addition of SiC led to slightly coarsening of the microstructure. The HEB-SiC ceramics prepared from boro/carbothermal reduction powders showed the fine-grained microstructure and higher Vickers’ hardness but lower fracture toughness values as compared with the same composition prepared from borothermal reduction powders. These results indicated that the selection of the powder processing method and the addition of SiC phase could contribute to the optimal preparation of high-entropy boride-based ceramics.

scholarly journals Optimal preparation of high-entropy boride-silicon carbide ceramics

2020 ◽  
Author(s):  
Yan Zhang ◽  
Shi-Kuan Sun ◽  
Wei-Ming Guo ◽  
Liang Xu ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Carbothermal Reduction ◽  
Powder Processing ◽  
Full Density ◽  
High Entropy ◽  
Sic Ceramics ◽  
Reduction Methods ◽  
Borothermal Reduction ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Abstract High-entropy boride-silicon carbide (HEB-SiC) ceramics were fabricated by using boride-based powders prepared from borothermal and boro/carbothermal reduction methods. The effects of processing routes (borothermal reduction and boro/carbothermal reduction) of HEB powders were examined. HEB-SiC ceramics with nearly relatively full density (>98%) were prepared by spark plasma sintering at 2000 °C. It was demonstrated that the addition of SiC led to slightly coarsening of the microstructure. The HEB-SiC ceramics prepared from boro/carbothermal reduction powders showed the fine-grained microstructure and higher Vickers’ hardness but lower fracture toughness values as compared with the same composition prepared from borothermal reduction powders. These results indicated that the selection of the powder processing method and the addition of SiC phase could contribute to the optimal preparation of high-entropy boride-based ceramics.

scholarly journals Optimal Preparation of High-entropy Boride-silicon Carbide Ceramics

2020 ◽  
Author(s):  
Yan Zhang ◽  
Shi-Kuan Sun ◽  
Wei-Ming Guo ◽  
Liang Xu ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Carbothermal Reduction ◽  
Powder Processing ◽  
Full Density ◽  
High Entropy ◽  
Sic Ceramics ◽  
Reduction Methods ◽  
Borothermal Reduction ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Abstract High-entropy boride-silicon carbide (HEB-SiC) ceramics were fabricated by using boride-based powders prepared from borothermal and boro/carbothermal reduction methods. The effects of processing routes of HEB powders were examined between borothermal reduction and boro/carbothermal reduction. HEB-SiC ceramics with nearly relatively full density (>98%) were prepared after spark plasma sintering at 2000oC. It was demonstrated that the addition of SiC led to the slightly microstructure coarsening. The HEB-SiC ceramics prepared from boro/carbothermal reduction powders showed the fine-grained microstructure and higher Vickers’ hardness but lower fracture toughness values as compared with the same composition prepared from borothermal reduction powders. These results indicated that the selection of the powder processing method and the addition of SiC phase could contribute to the optimal preparation of high-entropy boride based ceramics.

scholarly journals Optimal preparation of high-entropy boride-silicon carbide ceramics

2020 ◽  
Author(s):  
Yan Zhang ◽  
Shi-Kuan Sun ◽  
Wei-Ming Guo ◽  
Liang Xu ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Carbothermal Reduction ◽  
Powder Processing ◽  
High Entropy ◽  
Fine Grained ◽  
Sic Ceramics ◽  
Reduction Methods ◽  
Borothermal Reduction ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Abstract High-entropy boride-silicon carbide (HEB-SiC) ceramics were fabricated using boride-based powders prepared from borothermal and boro/carbothermal reduction methods. The effects of processing routes (borothermal reduction and boro/carbothermal reduction) on the HEB powders were examined. HEB-SiC ceramics with > 98% theoretical density were prepared by spark plasma sintering at 2000 °C. It was demonstrated that the addition of SiC led to slight coarsening of the microstructure. The HEB-SiC ceramics prepared from boro/carbothermal reduction powders showed a fine-grained microstructure and higher Vickers’ hardness but lower fracture toughness value as compared with the same composition prepared from borothermal reduction powders. These results indicated that the selection of the powder processing method and the addition of SiC phase could contribute to the optimal preparation of high-entropy boride-based ceramics.

The structure and phase condition's evolution in the silicon carbide ceramics surface layer under the electron-beam treatment

2018 ◽  
pp. 24-28
Author(s):  
Yu. F. Ivanov ◽  
O. L. Khasanov ◽  
M. S. Petyukevich ◽  
V. V. Polisadova ◽  
Z. G. Bikbaeva ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Surface Layer ◽  
Electron Beam ◽  
Electron Beam Treatment ◽  
Pulsed Electron Beam ◽  
Sic Ceramics ◽  
Treatment Conditions ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics ◽  
Beam Characteristics

The elemental constituents, phase composition and substructural evolution were investigated in the article in the silicon carbide ceramics surface layer which was subjected to the intense pulsed electron beam the density of the electron beam being varied. It was shown that the ceramic layer surface's structure and phase conditions were controlled by the electron beam characteristics. The SiC-ceramics surface layer nanostructuring was detected and the electron beam treatment conditions which lead to this effect were defined.

Nano-Grained Microstructure Design of Silicon Carbide Ceramics by SPS Process

2008 ◽  
Vol 403 ◽  
pp. 177-178
Author(s):  
Junichi Hojo ◽  
Hiroyuki Matsuura ◽  
Mikinori Hotta
Keyword(s):  
Silicon Carbide ◽  
Grain Growth ◽  
Microstructure Design ◽  
Sic Ceramics ◽  
Heating Schedule ◽  
Optimum Heating ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

SiC ceramics were fabricated from submicron- and nano-sized starting powders with Y2O3 and AlN additives by SPS process. The SPS process and the use of AlN additive were found to be effective for achieving the nano-grained microstructure with retarded grain growth. The nanoporous SiC ceramics were also obtained under the similar conditions. The optimum heating schedule and additive composition were proposed.

Microstructure and Mechanical Properties of Heat-Resistant Silicon Carbide Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 1409-1413 ◽  
Author(s):  
Young Wook Kim ◽  
Yong Seong Chun ◽  
Sung Hee Lee ◽  
Ji Yeon Park ◽  
Toshiyuki Nishimura ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Carbide ◽  
Intergranular Phase ◽  
Sintering Additives ◽  
Heat Resistant ◽  
Sic Ceramics ◽  
Microstructure And Mechanical Properties ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

There has been a great progress in the development of heat-resistant silicon carbide ceramics, owing to the better understanding of composition-microstructure-properties relations. Based on the progress, it has been possible to fabricate heat-resistant SiC ceramics with improved fracture toughness. In this paper, three rare-earth oxides (Re2O3, Re=Er, Lu, and Sc) in combination with AlN were used as sintering additives for a β-SiC containing 1 vol% α-SiC seeds. The effect of intergranular phase, using Re2O3 and AlN as sintering additives, on the microstructure and mechanical properties of liquid-phasesintered, and subsequently annealed SiC ceramics were investigated. The microstructure and mechanical properties were strongly influenced by the sintering additive composition, which determines the chemistry and structure of IGP. The strength and fracture toughness of the Lu2O3-doped SiC were ∼700 MPa at 1400oC and ∼6 MPa.m1/2 at room temperature, respectively. The beneficial effect of the new additive compositions on high-temperature strength was attributed to the crystallization of the intergranular phase.

Fabrication of Open-Cell, Microcellular Silicon Carbide Ceramics by Carbothermal Reduction

2005 ◽  
Vol 88 (10) ◽  
pp. 2949-2951 ◽  
Author(s):  
Young-Wook Kim ◽  
Shin-Han Kim ◽  
In-Hyuck Song ◽  
Hai-Doo Kim ◽  
Chul B. Park
Keyword(s):  
Silicon Carbide ◽  
Carbothermal Reduction ◽  
Open Cell ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics
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