Crystallization Kinetics of Cubic Boron Nitride in the B-N-Mg-H-F System

Shipilo, V. B.; Игнатенко, О. В.; Anichenko, N. G.; Azarko, I.I.

doi:10.1007/s10789-005-0196-8

Cited by 7 publications

(5 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The possible mechanism of boron incorporation should be involved in the general theory of c-BN crystal growth from solutions. This theory should explain the observed influence of boron on the crystallization and properties of c-BN crystals [15,16].…”

Section: Discussion Of the Resultsmentioning

confidence: 91%

Influence of boron impurities on the crystal structure of cubic boron nitride

Богданов

2008

Glass Phys Chem

View full text Add to dashboard Cite

The influence of boron impurities on the unit cell parameters of the boron nitride with a sphalerite structure is investigated. It is demonstrated that the presence of boron in amounts exceeding the stoichiometric composition leads to a distortion of the cubic lattice and reduces its symmetry. The revealed oriented distortion of the crystal lattice of the cubic boron nitride is explained by the incorporation of excess boron atoms not in a random manner but between paired corrugated hexagonal layers.

show abstract

Section: Discussion Of the Resultsmentioning

confidence: 91%

Influence of boron impurities on the crystal structure of cubic boron nitride

Богданов

2008

Glass Phys Chem

View full text Add to dashboard Cite

show abstract

“…Generally, cBN can be prepared under high temperature and high pressure from hexagonal [9], amorphous [10], or graphitelike [11] BN. Recently, cBN was synthesized using Ni-Cr and Ni-Cr-Al solvents at 1300-1700 1C and under 4-6 GPa pressures [12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and formation mechanism of cubic boron nitride nanorods in lithium bromide molten salt

et al. 2013

View full text Add to dashboard Cite

“…3) increases with increasing sintering temperature. When sintered at 1,100°C, the WC12Co/cBN(37/44) composite has density of 11.12 g/ cm 3 , i.e., exceeding the theoretical value by about 0.4 %, but when this composite was sintered at 1,200°C, its density increased to 11.34 g/cm 3 , which is higher than the theoretical value by about 2.3 %. It might be supposed that this increase of density during sintering at 1,200°C is due to the formation of a new phase with higher density.…”

Section: Methodsmentioning

confidence: 73%

“…6 wt.% Co sintered at 1,100°C by PPS was 14.85 g/cm 3 and that of cemented carbide containing 12 wt.% Co was 14.33 g/cm 3 . This indicates that addition of cBN particles decreases the sinterability compared with the cemented carbide itself.…”

Section: Methodsmentioning

confidence: 94%

“…Because of these advantages, cubic boron nitride is widely used for manufacture of cutting tools. Without the use of a catalyst, cubic boron nitride is obtained at temperature between 2,300 and 3,300°C and pressure of 6-10 GPa as a result of the phase transformation of hBN with hexagonal structure into a cBN regular structure [2] or, with the participation of a catalyst, at a temperature between 1,000 and 1,700°C under pressure of 2-6 GPa [3]. cBN produced without participation of a catalyst can be sintered in the form of polycrystalline plates suitable for use as cutting tools.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

WCCo/cBN composites produced by pulse plasma sintering method

Rosiński

Michalski

2012

J Mater Sci

View full text Add to dashboard Cite

WCCo/cBN composites have been considered as a next-generation material for use in cutting-tool edges, being characterized by an optimal combination of hardness and toughness. They can be used instead of WCCo/ diamond composites in machining of iron-based materials. The major challenge in sintering these composites is to produce a well-bonded interface between the WCCo matrix and cBN particles. In this study, WCCo/cBN composites were fabricated by the pulse plasma sintering technique. The aim of this work is to obtain sintered parts with density near the theoretical value and with very good contact between the cBN particles and WCCo matrix. cBN/ cemented carbide containing 30 vol.% of cBN particles was produced using a mixture of 6 and 12 wt.% Co-added WC powder, with WC grain size of 0.4 lm and cBN powder with grain size ranging from 4 to 40 lm. Scanning electron microscopy (SEM) observations of the microstructure and diffraction phase examinations did not show the presence of hBN phase. The specific heating conditions used to consolidate the material using high-current pulses hamper the transformation of cBN into hBN and ensure a strong bond between the cBN particles and the cemented carbide matrix. Fractures through the WCCo/cBN composite showed that only few cBN particles were torn out from the cemented carbide matrix, with most of them having been cleaved along the fracture plane. This provides evidence that the bond at the WCCo/cBN interface is mechanically strong. Composites sintered at temperature of 1,200°C under pressure of 100 MPa for 5 min had density near the theoretical value. Increase of the sintering temperature to 1,200°C resulted in an increase of the hardness to 2,330 HK1 for the WC6Co/cBN(1/3) composite and to 2,160 HK1 for the WC6Co/cBN(37/44) composite.

show abstract

Crystallization Kinetics of Cubic Boron Nitride in the B-N-Mg-H-F System

Cited by 7 publications

References 1 publication

Influence of boron impurities on the crystal structure of cubic boron nitride

Influence of boron impurities on the crystal structure of cubic boron nitride

Synthesis and formation mechanism of cubic boron nitride nanorods in lithium bromide molten salt

WCCo/cBN composites produced by pulse plasma sintering method

Contact Info

Product

Resources

About