Characterisation of thermally degraded polycrystalline diamond

Westraadt, Johan Ewald; Sigalas, Iakovos; Neethling, J.H.

doi:10.1016/j.ijrmhm.2014.08.008

Cited by 59 publications

(22 citation statements)

References 21 publications

(34 reference statements)

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“…The friction resulting from the cutting process can lead to the generation of high temperatures, which can cause thermal degradation of the PDC. The presence of Co, which can aid the sintering process during the manufacture of PDC, can also catalyze the transformation of diamond to graphite at high temperatures [71]. In air, the onset of damage appears to occur at approximately 600 • C and is accompanied by extrusion of the binder phase from the PDC surface, the extent of which is dependent on the binder content in the PDC [67].…”

Section: Thermal Degradationmentioning

confidence: 99%

“…Westraadt et al [71] studied the thermal degradation of PCD when used in the machining of granite. In the tests, which were conducted under dry conditions, thermocouples mounted on the diamond surfaces recorded temperatures in excess of 500 • C. As a consequence, cracks (largely intergranular) were observed extending from the surface into the interior of the material.…”

Section: Thermal Degradationmentioning

confidence: 99%

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Applications of Diamond to Improve Tribological Performance in the Oil and Gas Industry

Wheeler

2018

Lubricants

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The use of diamond in tribological applications in the oil and gas industry is reviewed. The high hardness, strength, and corrosion resistance of diamond make it an attractive option for components that are susceptible to degradation by abrasive, erosive, or adhesive wear; such components may also be prone to corrosion owing to the nature of the environments to which they are often exposed. Applications such as drill bits, bearings, and mechanical seals benefit from the use of diamond, while choke valves are the subject of research programs to assess the suitability of chemical vapor deposition (CVD) diamond for these components. Also discussed are some of the conditions experienced by the components and how the properties of diamond enhance their operating lives.

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Section: Thermal Degradationmentioning

confidence: 99%

Section: Thermal Degradationmentioning

confidence: 99%

Applications of Diamond to Improve Tribological Performance in the Oil and Gas Industry

Wheeler

2018

Lubricants

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“…Moreover, the presence of cobalt acts to increase the rate of diamond graphitisation at elevated temperatures within the heat affected zone, further reducing tool life [28]. The effect of removing cobalt from the microstructure of PCD was investigated by Liu et al [21], who observed subsequent increase in the wear resistance of PCD cutters at elevated temperatures.…”

Section: Effect Of Leaching On Toughnessmentioning

confidence: 99%

Fracture toughness evaluation of polycrystalline diamond as a function of microstructure

McNamara

Alveen

Carolan

et al. 2015

Engineering Fracture Mechanics

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“…Diamond, as one of the most well‐known superhard materials, possesses an extreme hardness of 70–110 GPa in its single crystal form and a bulk modulus ( K ) of 442 GPa; however, it is not suitable for machining ferrous metals due to the formation of brittle carbides which shortens its lifetime . Moreover, because of its poor oxidative stability, diamond cannot be used in air at high temperatures …”

Section: Introductionmentioning

confidence: 99%

Radial X‐Ray Diffraction Study of Superhard Early Transition Metal Dodecaborides under High Pressure

Lei

Akopov

Yeung

et al. 2019

Adv Funct Materials

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The deformation behavior of the three metal dodecaborides (YB 12 , ZrB 12 , and Zr 0.5 Y 0.5 B 12 ) is investigated using radial X-ray diffraction under nonhydrostatic compression up to ≈60 GPa with a goal of understanding how bonding and metal composition control hardness. Zr 0.5 Y 0.5 B 12 , which has the highest Vickers hardness (Hv = 45.8 ± 1.3 GPa at 0.49 N load), also shows the highest bulk modulus (K 0 = 320 ± 5 GPa). The 0.49 N hardness for ZrB 12 and YB 12 are both lower and very similar, and both show lower bulk moduli (K 0 = 276 ± 7 GPa, and K 0 = 238 ± 6 GPa, respectively). Differential stress is then measured to study the strength and strength anisotropy. Zr 0.5 Y 0.5 B 12 supports the highest differential stress, in agreement with its high hardness, a fact that likely arises from atomic size mismatch between Zr and Y combined with the rigid network of boron cages. The (200) plane for all samples supports the largest differential strain, while the (111) plane supports the smallest, consistent with the theoretically predicted slip system of {111} [ 1 11 12 2 ]. Strain softening is also observed for ZrB 12 . Finally, the full elastic stiffness tensors for ZrB 12 and YB 12 are solved. ZrB 12 is the most isotropic, but the extent of elastic anisotropy for all dodecaborides studied is relatively low due to the highly symmetric boron cage network.

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Characterisation of thermally degraded polycrystalline diamond

Cited by 59 publications

References 21 publications

Applications of Diamond to Improve Tribological Performance in the Oil and Gas Industry

Applications of Diamond to Improve Tribological Performance in the Oil and Gas Industry

Fracture toughness evaluation of polycrystalline diamond as a function of microstructure

Radial X‐Ray Diffraction Study of Superhard Early Transition Metal Dodecaborides under High Pressure

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