Fabrication and characterization of B4C-based ceramic composites with different mass fractions of hexagonal boron nitride

Li, Xiuqing; Gao, Yimin; Wu, Pan; Wang, Xin; Song, Liancheng; Zhong, Zhichao; Wu, Shanshan

doi:10.1016/j.ceramint.2014.07.042

Cited by 41 publications

(5 citation statements)

References 31 publications

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“…Further, an increase in the applied load (60 N) causes a decrease in the wear rate of composite, due to the presence of an hBN film in the contact zone. 31 The hBN particles smeared over the sliding surface reduce rough mating between the tribocouple, thereby reducing extensive plastic deformation of the composite pin.…”

Section: Resultsmentioning

confidence: 99%

Influence of ZrB₂/hBN particles on the wear behaviour of AA7075 composites fabricated through stir followed by squeeze cast technique

Loganathan

Gnanavelbabu

Rajkumar³

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper reports on the effect of ZrB2 and hBN solid lubricant particles on the dry sliding wear behaviour of the AA7075 composite, fabricated by stir-squeeze cast technique. ZrB2 and hBN at levels of 5 wt% were chosen as reinforcements for the study. The optical microscope images revealed uniform distribution of particles and a low order of porosity in microstructure, possibly due to the squeeze pressure. The ZrB2 particles reinforced composite (AZ) showed an improvement in hardness compared to as-cast (A0) and hBN containing composite (AH). A minor reduction in the hardness of ZrB2–hBN hybrid composite (AZH) was observed. This is attributed to changes in the hardness induced by the individual ZrB2 and hBN particles. The hybrid composite (AZH) exhibits a superior wear resistance, possibly due to the formation of good quality B2O3 and H3BO3 self-lubricating film.

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Section: Resultsmentioning

confidence: 99%

Influence of ZrB₂/hBN particles on the wear behaviour of AA7075 composites fabricated through stir followed by squeeze cast technique

Loganathan

Gnanavelbabu

Rajkumar³

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…He noticed that there was a large anisotropy of thermal properties [ 12 , 13 ]. Even in the case of the hot-pressing process, a higher concentration of hBN will increase the material porosity and decrease the mechanical properties, which was confirmed by Li et al They noticed that a 20% h-BN addition will improve the friction coefficient of such composites and simultaneously, there is an increase in the wear coefficient [ 10 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ] when 5 wt % of h-BN in the material is exceeded. They found that in distilled water conditions, the wear behavior of B 4 C/h-BN composites against steel is improved.…”

Section: Introductionmentioning

confidence: 87%

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

et al. 2020

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This work concerns boron carbide matrix composites with the addition of hexagonal boron nitride particles (h-BN) as a solid lubricate. The composite materials were hot-pressed and analysed in terms of phase, structure, and microstructure changes in relation to the h-BN content. The uniaxial pressure applied during the manufacturing process allowed the orientation of single h-BN particles and its agglomerates in perpendicular direction to the pressing axis. The anisotropy of heat transfer and thermal expansion coefficient (CTE) and density changes in relation to temperature are discussed. Thermal diffusivity and conductivity were measured in relation to the material direction by the laser flash analysis method (LFA). In this paper, understanding the heat flow and CTE changes allowed explaining the results of investigated subtractive laser processes of the manufactured composites. The laser ablation process was conducted on B4C/h-BN composites in parallel and perpendicular direction to each other. It was done in a continuous work (CW) mode at 50 W with a 40 µm spot and 3 mm/s beam travel speed. The influence of h-BN particles and their orientation on thermal properties is discussed. The effect of laser processing on B4C/h-BN composites was also discussed in relation to the material surface roughness measured with a confocal microscope, microstructure observations, density, and thermal properties changes in relation to the material direction.

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“…3(g) . This kind of agglomeration was equivalent to micron-sized defects, and this loose agglomerate will also produce more void defects at the junction of the nanotube and the matrix, which will hinder the densi cation of the matrix [14,19].…”

Section: Preparation Of Bnnts/b 4 C Composite Ceramicsmentioning

confidence: 99%

Fabrication and Mechanical Properties of Boron Nitride Nanotube Reinforced Boron Carbide Ceramics

Liu

et al. 2020

Preprint

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A series of BNNTs/B4C composite ceramic were prepared by the spark plasma sintering (SPS) technology using boron carbide (B4C) powders as the matrix and boron nitride nanotubes (BNNTs) as the toughening phase. The XRD, SEM, TEM and HR-TEM were used to characterize the B4C samples. The influence of sintering temperature, BNNTs content and matrix particle size on the microstructures and mechanical properties of B4C composite ceramics, as well the toughening mechanism were investigated in detail. The experimental results showed that changing the particle size of the powder, increasing the sintering temperature and adding BNNTs could significantly improve the mechanical properties of the material. The ceramic samples obtained by adding 5wt.% BNNTs content sintered at 1750℃ displayed the best mechanical properties. Its relative density, microhardness and fracture toughness respectively were 99.41%, 32.68 GPa and 6.87 Mpa·m1/2, respectively. In particular, the fracture toughness value of the BNNTs/B4C composite ceramic was 54.59% higher than that of B4C ceramics without BNNTs.

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Fabrication and characterization of B4C-based ceramic composites with different mass fractions of hexagonal boron nitride

Cited by 41 publications

References 31 publications

Influence of ZrB₂/hBN particles on the wear behaviour of AA7075 composites fabricated through stir followed by squeeze cast technique

Influence of ZrB₂/hBN particles on the wear behaviour of AA7075 composites fabricated through stir followed by squeeze cast technique

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

Fabrication and Mechanical Properties of Boron Nitride Nanotube Reinforced Boron Carbide Ceramics

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Fabrication and characterization of B4C-based ceramic composites with different mass fractions of hexagonal boron nitride

Cited by 41 publications

References 31 publications

Influence of ZrB2/hBN particles on the wear behaviour of AA7075 composites fabricated through stir followed by squeeze cast technique

Influence of ZrB2/hBN particles on the wear behaviour of AA7075 composites fabricated through stir followed by squeeze cast technique

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

Fabrication and Mechanical Properties of Boron Nitride Nanotube Reinforced Boron Carbide Ceramics

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About

Influence of ZrB₂/hBN particles on the wear behaviour of AA7075 composites fabricated through stir followed by squeeze cast technique

Influence of ZrB₂/hBN particles on the wear behaviour of AA7075 composites fabricated through stir followed by squeeze cast technique