Rise in the efficiency of the use of cemented carbides as a matrix of diamond-containing studs of rock destruction tool

Loshak, M. G.; Alexandrova, L. I.

doi:10.1016/s0263-4368(00)00039-1

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…The most demanded metal-matrix composite in the manufacture of diamond tools operating under high dynamic and temperature loads is a matrix based on a cemented carbide powder mixture WC-Co-Cu due to the high level of physical and mechanical properties. The strength of diamonds fixing in a carbide matrix is determined by mechanical adhesion, which does not provide a high level of diamond retention [2][3][4][5][6][7][8][9][10]. To ensure chemical adhesion between diamond and the matrix, a hybrid technology for manufacturing diamond tools has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Structural-Phase State of the Interphase Boundary at Thermal Diffusion Metallization of Diamond Grains by Cr and Ti

Sharin

Akimova

Yakovleva

2020

MSF

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Structural-phase state of the diamond-metallized coating interphase boundary after thermal diffusion metallization of diamond grains by transition metals Cr, Ti were studied. Metallization were conducted under temperature-time mode corresponding to the sintering of cemented carbide matrices with Cu impregnation. The structural-phase state of the metallized coating and diamond-coating interphase boundary was studied by scanning electron microscopy, X-ray phase analysis and Raman spectroscopy. It was found that a thin continuous metal carbide coating chemically bonded to the diamond and consisting of the corresponding metal, their carbides and small amount of graphite phases is formed during thermal diffusion metallization of diamond by Cr and Ti under the conditions specified in the experiment. It was shown that graphite is formed not by a continuous layer, but in the form of local inclusions. This ensures a strong adhesion of the metallized coating to the diamond through the carbides of the corresponding metals. The results can be useful in the development of compositions and technological methods that provide an increased level of diamond retention in the matrices of tools based on cemented carbide powder mixtures.

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Section: Introductionmentioning

confidence: 99%

Structural-Phase State of the Interphase Boundary at Thermal Diffusion Metallization of Diamond Grains by Cr and Ti

Sharin

Akimova

Yakovleva

2020

MSF

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“…The effects of additives on the properties of the bit matrix material have been studied; the additives have been shown to significantly improve wear resistance, flexural strength and impact toughness of the obtained bit matrix [7][8][9]. To improve the strength and plasticity of a matrix of diamond-containing studs for rock-destruction tools and thereby increase the efficiency of the tools, Loshak and Alexandrova [10] suggested replacing the VK6 and VK10 carbides currently used as a matrix with VK6S and VK10S alloys based on a high-temperature tungsten carbide. The structure of the matrix-body concave bit has been studied to parameterize the design using Pro/E (Pro/ENGINEER), and a technology system of the related parameters has been established for the structural design of bits [11].…”

Section: Introductionmentioning

confidence: 99%

Fracture mechanism of air percussive rotary bit matrix based on impact stress wave theory

Huang¹,

Ma²,

Qiu³

et al. 2017

J. vibroeng.

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An air percussive rotary bit is a key component of air percussive rotary drilling technology, and its fracture failure seriously affects the safe operation and economic efficiency of drilling. This paper presents (1) theoretical analysis of the impact stress wave propagating in the air percussive rotary bit and effect of the stress wave on bit fracture and (2) finite element simulation study based on the stress wave theory which builds a model of the air hammer piston, drill and rock, defines material parameters, meshes and defines boundary conditions, clarifies propagation characteristics of the impact stress wave, analyzes stress characteristics of the bit matrix under different conditions (same drilling pressure and same piston speed, different drilling pressure and same piston speed and same drilling pressure and different piston speed) and determines the main factors of bit matrix fracture. The correctness of the theoretical analysis was verified with simulation results and fundamental ways of preventing bit fracture failure were proposed to provide a theoretical basis for the structural optimization design of a new bit. The results show that a bit section mutation is the root cause for the shock of the impact wave and the change in nature of the wave during propagation. The tensile wave is the root cause for bit matrix fracture, and a breakage is the most serious at stomatal interchanges. With increasing drilling pressure and piston speed, the rate of increase in the peak stress of the bit matrix increases, leading to early fatigue fracture of the bit matrix. The fracture of the bit matrix can be reduced, and the bit life can be extended by rationally designing the bit sectional structure parameters, ensuring that the bit withstands the effects of the compression wave so as to reduce the formation of a tensile wave, and rationally choosing drilling process parameters (such as drilling pressure and air pressure).

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“…Much attention is currently given to crystalline diamond nanoparticles (nanodiamonds, NDs) owing to their unique physical and chemical properties that provide various potential applications in luminescence biomedical imaging, drug delivery, tribology, quantum engineering, surface coatings etc. , Nanodiamonds are commonly synthesized as powders using the graphite-diamond phase transition at high temperature and pressure (by detonation of a mixture of strong organic explosives with a negative oxygen balance) − or as films using chemical formation with plasma assisted chemical vapor deposition (CVD) techniques. , Other techniques for the synthesis of NDs are laser ablation, , high-energy ball milling of high-pressure high-temperature (HPHT) diamond microcrystals, , shock compression (SC) of different carbon precursors in a metallic matrix, , autoclave synthesis from supercritical fluids etc. The nanoparticles obtained have a stable crystalline diamond core and therefore their physical and chemical properties are mainly governed by the characteristics of the atomic and electronic structure of the surfaces.…”

Section: Introductionmentioning

confidence: 99%

Comparative NEXAFS, NMR, and FTIR Study of Various-Sized Nanodiamonds: As-Prepared and Fluorinated

et al. 2014

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Various 4−50 nm in size diamond nanoparticles prepared by different synthesis methods and their fluorinated derivatives were studied by NEXAFS, solid state NMR and FTIR spectroscopy. C 1s and F 1s NEXAFS spectra of as-prepared and fluorinated nanodiamonds (NDs and F-NDs) were analyzed based on a comparison with the known ones of reference compounds (graphitized carbon nanodiscs, phenol and amino acid molecules, graphite oxide and monofluoride). It has been found that all the studied diamond nanoparticles have crystalline diamond cores and their surfaces are covered with graphite-like carbon clusters. These clusters are partially amorphized and oxidized with the formation of functional groups C−OH, CO, or OC−OH and the properties of these surface shells depend on the synthesis method of nanodiamonds. The fluorination of diamond nanoparticles has a purely superficial character; it almost completely cleans the NDs particles from carbon clusters and saturates dangling bonds on the surface of the diamond nanoparticles with F atoms forming covalent σ(C−F) bonds. NEXAFS data are further supported by NMR and FTIR spectroscopy, leading to similar conclusions concerning the properties of various NDs and the chemical bonding between C and F atoms in F-NDs. A combination of NEXAFS, solid state NMR and FTIR spectroscopy is demonstrated to be very efficient in investigating various NDs and their functionalized derivatives.

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Rise in the efficiency of the use of cemented carbides as a matrix of diamond-containing studs of rock destruction tool

Cited by 9 publications

References 1 publication

Structural-Phase State of the Interphase Boundary at Thermal Diffusion Metallization of Diamond Grains by Cr and Ti

Structural-Phase State of the Interphase Boundary at Thermal Diffusion Metallization of Diamond Grains by Cr and Ti

Fracture mechanism of air percussive rotary bit matrix based on impact stress wave theory

Comparative NEXAFS, NMR, and FTIR Study of Various-Sized Nanodiamonds: As-Prepared and Fluorinated

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