Microstructure and mechanical properties of fine-grained boron carbide ceramics fabricated by high-pressure hot pressing combined with high-energy ball milling

Zhang, Xiaorong; Zhang, Zhixiao; Nie, Bin; Chen, Huanyu; Wang, Yanming; Zheng, Lei; Bai, Yongmei; Wang, Weimin

doi:10.1016/j.ceramint.2018.03.114

Cited by 23 publications

(11 citation statements)

References 28 publications

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“…Boron carbide (B4C) based ceramic materials have been intensively studied, because of their excellent properties [1][2][3]. Due to its prevailing covalent bonding the boron carbide based ceramic materials are extremely hard.…”

Section: Introductionmentioning

confidence: 99%

Boron Carbide Based Ceramic Composites Hot Pressed With Aluminium Additive

Švec¹,

Gábrišová²,

Brusilová³

et al. 2020

Acta Metall Slovaca

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Ceramic composite materials consisting of B4C matrix and Al8B4C7 secondary phase were prepared by in situ reactive sintering of the initial powder mixture B4C-Al with concentration from 5 to 25 wt.% Al sintering additives. The composite samples were hot pressed at the temperature of 1850 °C, pressure of 35 MPa, for 15 min in a vacuum atmosphere. The portion of Al8B4C7 secondary phase increased from 3.3 to 22.1 wt.% when increasing the concentration of Al sintering additive from 5 to 25 wt.% Al. Significant improving of densification and mechanical properties was measured at increasing of Al sintering additive concentration from 5 to 10 wt.% Al. The highest average hardness of 28.74 GPa was achieved when adding 15 wt.% Al sintering additive. The fracture toughness increased with concentration of Al sintering additive in whole concentration range with the highest average value of 5.92 MPa.m1/2 at 25 wt.% Al sintering additives.

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Section: Introductionmentioning

confidence: 99%

Boron Carbide Based Ceramic Composites Hot Pressed With Aluminium Additive

Švec¹,

Gábrišová²,

Brusilová³

et al. 2020

Acta Metall Slovaca

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“…B 4 C possesses mainly an exceptional hardness of 20-45 GPa and high Young's modulus of 360-500 GPa [1][2][3]. It has high melting point of 2450°C and low density of 2.52 g/cm 3 [2,[4][5][6][7][8]. B 4 C is characterised by good wear resistance, excellent chemical stability as well as high capacity for neutron absorption [4,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…B 4 C is characterised by good wear resistance, excellent chemical stability as well as high capacity for neutron absorption [4,8,9]. However, the main disadvantages of B 4 C based ceramics are their relatively low fracture toughness and poor sinterability [2,7,[9][10][11]. Depending on the consolidation method and process parameters the fracture toughness of monolithic B 4 C reaches values of 1.2-4.5 MPa•m 1/2 [1,2,[7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…However, the main disadvantages of B 4 C based ceramics are their relatively low fracture toughness and poor sinterability [2,7,[9][10][11]. Depending on the consolidation method and process parameters the fracture toughness of monolithic B 4 C reaches values of 1.2-4.5 MPa•m 1/2 [1,2,[7][8][9][10][11][12][13][14]. As these values are insufficient for many industrial applications, the fracture toughness of B 4 C is a critical property and should be enhanced [6,11].…”

Section: Introductionmentioning

confidence: 99%

“…Poor sinterability of B 4 C is caused by strong covalent bond and low selfdiffusion coefficient of B 4 C [2,4,5,8,15]. Densification of monolithic B 4 C powder requires high temperatures of 2300°C and/or application of high pressures [7,4,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Reactive sintering of B4c-TiB2 composites from B4 and TiO2 precursors

Švec

Gábrišová

Brusilová

2020

PAC

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The effect of sintering temperature in the interval from 1775 to 1850?C on the density, microstructure, hardness and fracture toughness of ceramic composites consisting of a boron carbide matrix and titanium diboride secondary phase was studied. The composites were hot pressed using in situ reaction between boron carbide and 40 wt.% of titanium dioxide additive. The samples were hot pressed at different temperatures but for the constant time of 60min, under the pressure of 35MPa in vacuum of 10 Pa. Both Vickers hardness and fracture toughness of the composites increased with the sintering temperature.Maximal hardness of 29.8GPa and fracture toughness of 6.9MPa?m1/2 were achieved for the composite with 29.6 vol.% of titanium diboride secondary phase sintered at the highest sintering temperature of 1850?C.

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