Influence of cBN content, Al2O3 and Si3N4 additives and their morphology on microstructure, properties, and wear of PCBN with NbN binder

Rumiantseva, Yu. Yu.; Melnichuk, Iu; Garashchenko, V. V.; Zaporozhets, O. I.; Turkevich, V. Z.; Bushlya, Volodymyr

doi:10.1016/j.ceramint.2020.05.300

Cited by 17 publications

(11 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To comprehensively evaluate the mechanical properties of cBN-hBN-SiC w nanocomposites, the hardness, fracture toughness, and flexural strength of cBN composites with various additives reported previously are listed in Table 1 [ 4 , 24 , 29 , 45 , 46 , 47 , 48 , 49 ]. As shown in Table 1 , metal additives have the effect of toughening, but they cause a serious loss of hardness for cBN composites [ 14 , 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Table 1 , metal additives have the effect of toughening, but they cause a serious loss of hardness for cBN composites [ 14 , 46 , 47 ]. When introducing ceramic additives, the comprehensive mechanical properties of the cBN composites are obviously better than those prepared by using only metal additives [ 14 , 24 , 29 , 47 , 49 ]. The mechanical properties of cBN composites can be further improved by introducing 2D materials such as Ti 3 AlC 2 and hBN [ 45 , 48 ], and 1D materials such as SiC whiskers and Al 2 O 3 whiskers [ 4 , 24 ].…”

Section: Resultsmentioning

confidence: 99%

“…Recently, low-dimensional ceramic materials have been the most widely chosen additives to fabricate high-performance composites [ 20 , 21 , 22 , 23 , 24 , 25 ]. One-dimensional (1D) materials involve nanofibers [ 20 , 26 , 27 ], nanotubes [ 21 , 22 , 28 ], and whiskers [ 23 , 24 , 25 , 29 ], which are singular structures with the lateral dimension in submicron or nanometer scale. One-dimensional materials are ideal systems for exploring various new phenomena at the nanoscale and studying the size and dimensionality dependence of functional properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of cBN-hBN-SiCw Nanocomposite with Superior Hardness, Strength, and Toughness

Sun

Zou

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

Nanocomposites with one-dimensional (1D) and two-dimensional (2D) phases can demonstrate superior hardness, fracture toughness, and flexural strength. Cubic boron nitride-hexagonal boron nitride-silicon carbide whiskers (cBN-hBN-SiCw) nanocomposites with the simultaneous containing 1D SiCw and 2D hBN phases were successfully fabricated via the high-pressure sintering of a mixture of SiCw and cBN nanopowders. The hBN was generated in situ via the limited phase transition from cBN to hBN. Nanocomposites with 25 wt.% SiCw exhibited optimal comprehensive mechanical properties with Vickers hardness of 36.5 GPa, fracture toughness of 6.2 MPa·m1/2, and flexural strength of 687.4 MPa. Higher SiCw contents did not significantly affect the flexural strength but clearly decreased the hardness and toughness. The main toughening mechanism is believed to be a combination of hBN inter-layer sliding, SiCw pull-out, crack deflection, and crack bridging.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of cBN-hBN-SiCw Nanocomposite with Superior Hardness, Strength, and Toughness

Sun

Zou

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…Results obtained by PALS can serve as a research background for the development of independent methods of diagnosing nanosized free volumes in ceramic materials, including neutron and heavy-ion irradiated MgAl 2 O 4 spinels [53][54][55], Si 3 N 4 [56], Ge 3 N 4 [57], and AlN [58][59][60] (which are especially promising as diagnostic materials for EUROfusion applications) and also facilitate understanding of porosity, development, and transformation of pores in electrochemical and other devices for energy conversion [61][62][63][64][65][66][67][68].…”

Section: Discussionmentioning

confidence: 99%

Positron Annihilation Lifetime Spectroscopy Insight on Free Volume Conversion of Nanostructured MgAl2O4 Ceramics

et al. 2021

View full text Add to dashboard Cite

Herein we demonstrate the specifics of using the positron annihilation lifetime spectroscopy (PALS) method for the study of free volume changes in functional ceramic materials. Choosing technological modification of nanostructured MgAl2O4 spinel as an example, we show that for ceramics with well-developed porosity positron annihilation is revealed through two channels: positron trapping channel and ortho-positronium decay. Positron trapping in free-volume defects is described by the second component of spectra and ortho-positronium decay process by single or multiple components, depending on how well porosity is developed and on the experimental configuration. When using proposed positron annihilation lifetime spectroscopy approaches, three components are the most suitable fit in the case of MgAl2O4 ceramics. In the analysis of the second component, it is shown that technological modification (increasing sintering temperature) leads to volume shrinking and decreases the number of defect-related voids. This process is also accompanied by the decrease of the size of nanopores (described by the third component), while the overall number of nanopores is not affected. The approach to the analysis of positron annihilation lifetime spectra presented here can be applied to a wide range of functional nanomaterials with pronounced porosity.

show abstract

“…Results obtained by PAL spectroscopy can serve as a research base for the development of independent complementary methods for studying nanosized free volumes in ceramic materials, including neutron and heavy ion irradiated MgAl 2 O 4 spinels [22,27,48], Si 3 N 4 [49], Ge 3 N 4 [50] and AlN [51][52][53], which are especially promising as diagnostic materials for nuclear applications. Other interesting and very important areas are the understanding of porosity, its development and transformation in electrochemical and other devices for energy conversion [54][55][56][57][58][59][60][61][62][63][64].…”

Section: Discussionmentioning

confidence: 99%

Evolution of Free Volumes in Polycrystalline BaGa2O4 Ceramics Doped with Eu3+ Ions

et al. 2021

View full text Add to dashboard Cite

BaGa2O4 ceramics doped with Eu3+ ions (1, 3 and 4 mol.%) were obtained by solid-phase sintering. The phase composition and microstructural features of ceramics were investigated using X-ray diffraction and scanning electron microscopy in comparison with energy-dispersive methods. Here, it is shown that undoped and Eu3+-doped BaGa2O4 ceramics are characterized by a developed structure of grains, grain boundaries and pores. Additional phases are mainly localized near grain boundaries creating additional defects. The evolution of defect-related extended free volumes in BaGa2O4 ceramics due to the increase in the content of Eu3+ ions was studied using the positron annihilation lifetime spectroscopy technique. It is established that the increase in the number of Eu3+ ions in the basic BaGa2O4 matrix leads to the agglomeration of free-volume defects with their subsequent fragmentation. The presence of Eu3+ ions results in the expansion of nanosized pores and an increase in their number with their future fragmentation.

show abstract

Influence of cBN content, Al2O3 and Si3N4 additives and their morphology on microstructure, properties, and wear of PCBN with NbN binder

Cited by 17 publications

References 18 publications

Synthesis of cBN-hBN-SiCw Nanocomposite with Superior Hardness, Strength, and Toughness

Synthesis of cBN-hBN-SiCw Nanocomposite with Superior Hardness, Strength, and Toughness

Positron Annihilation Lifetime Spectroscopy Insight on Free Volume Conversion of Nanostructured MgAl2O4 Ceramics

Evolution of Free Volumes in Polycrystalline BaGa2O4 Ceramics Doped with Eu3+ Ions

Contact Info

Product

Resources

About