Polycrystalline diamond cutters sintered with magnesium carbonate in cubic anvil press

Qian, Jiang; McMurray, C.E.; Mukhopadhyay, D.K.; Wiggins, J.; Vail, Michael A.; Bertagnolli, K.

doi:10.1016/j.ijrmhm.2011.09.008

Cited by 23 publications

(10 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In each experimental run, the sample was first compressed to a desired pressure and then heated to a target temperature and soaked for 30 min before quench to room temperature and subsequent decompression to ambient conditions. More experimental details can be found elsewhere (50,51). The recovered run product was ground into powder and washed in acetic or diluted nitric acid to remove excess PbO, followed by drying in an oven at 333 K. For the electrical resistivity and dielectric measurements, high-density bulk samples were prepared by sintering purified powders at 8 GPa and 1,373 K for 1 h.…”

Section: Methodsmentioning

confidence: 99%

Unusual Mott transition in multiferroic PbCrO ₃

Wang

Zhu

Zhang

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron localization. Turning such an insulator into a metal, the so-called Mott transition, is commonly achieved by “bandwidth” control or “band filling.” However, both mechanisms deviate from the original concept of Mott, which attributes such a transition to the screening of Coulomb potential and associated lattice contraction. Here, we report a pressure-induced isostructural Mott transition in cubic perovskite PbCrO3. At the transition pressure of ∼3 GPa, PbCrO3 exhibits significant collapse in both lattice volume and Coulomb potential. Concurrent with the collapse, it transforms from a hybrid multiferroic insulator to a metal. For the first time to our knowledge, these findings validate the scenario conceived by Mott. Close to the Mott criticality at ∼300 K, fluctuations of the lattice and charge give rise to elastic anomalies and Laudau critical behaviors resembling the classic liquid–gas transition. The anomalously large lattice volume and Coulomb potential in the low-pressure insulating phase are largely associated with the ferroelectric distortion, which is substantially suppressed at high pressures, leading to the first-order phase transition without symmetry breaking.

show abstract

Section: Methodsmentioning

confidence: 99%

Unusual Mott transition in multiferroic PbCrO ₃

Wang

Zhu

Zhang

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…Several works [5,10,11] have considered the influence of the metallic sintering aid on the thermal stability of PCD, and two different hypotheses have emerged as a means of explaining the influence of the metallic binder on the thermal stability of the material. The metallic sintering aid (usually cobalt) has a greater coefficient of thermal expansion (α) than diamond.…”

Section: Introductionmentioning

confidence: 99%

“…Earth-alkali carbonate binders have been used extensively as a replacement for the metallic binder. PCD materials sintered in the presence of these carbonates have mechanical properties similar to metallic PCD and exhibit improved thermal stability (1200°C) [10,22,23]. However, this material requires elevated (when compared to current production processes) sintering conditions of N 7.7 GPa and N 2000°C for successful sintering, which increases the cost of manufacturing.…”

Section: Introductionmentioning

confidence: 99%

“…The first instance occurs during tool manufacturing where high temperature brazing is used to fix the material to the tool. The second instance occurs during drilling or machining operations where frictional forces at the contact surface are converted into heat energy during operation [7][8][9].Several works [5,10,11] have considered the influence of the metallic sintering aid on the thermal stability of PCD, and two different hypotheses have emerged as a means of explaining the influence of the metallic binder on the thermal stability of the material. The metallic sintering aid (usually cobalt) has a greater coefficient of thermal expansion (α) than diamond.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Characterisation of thermally degraded polycrystalline diamond

Westraadt

Sigalas

Neethling

2015

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

“…During a down-hole impact event, the PCD bit absorbs impact energy, by deforming under the applied load. PCD bits with higher strain energy capacity will be able to absorb more impact energy during drilling without exceeding the diamond yield strength or fracture toughness limit [3][4][5][6][7]. Therefore, the strength and the fracture toughness of the PCD are the main properties that control its wear resistance and durability.…”

Section: Introductionmentioning

confidence: 99%

High-pressure, high-temperature plastic deformation of sintered diamonds

Gasc

Wang

et al. 2015

Diamond and Related Materials

View full text Add to dashboard Cite

a b s t r a c tThe strength of polycrystalline diamond (PCD) was investigated through a high pressure (P) and temperature (T) deformation experiment. Prior to the deformation experiment, two bulk samples were sintered back to back under identical conditions with two different precursors, which shared identical initial grain size distribution. Precursor of one sample (2E) had lower concentration of crystalline defects than that of the other sample (1S). In crushing strength tests, precursor of 2E exhibited an enhanced crushing strength compared to that of 1S. During the high P-T deformation experiment, the two samples were stacked back to back and deformed together. Their mechanical properties were investigated in situ using synchrotron X-ray diffraction and imaging in the deformation DIA apparatus. The strain data based on imaging showed that the two samples were deformed at identical strain rates (ca. 1.5 × 10 −5 s −1 ) and analysis based on lattice plane distortions in the diffraction patterns showed that sample 2E exhibits marginally higher strength than that of sample 1S. The X-ray data indicate that, upon deformation, larger elastic lattice strain builds up within the grains in sample 2E, indicating greater strength at grain-to-grain level in this sample. In addition, lower micro-stress levels are evidenced upon hydrostatic loading of sample 2E, strongly indicating a better sintering state than that in sample 1S. We interpret these differences as due to a lower defect concentration, particularly on the grain surfaces of the precursor powder, that results in stronger diamond-diamond bonding. Altogether, these data suggest that the use of diamond grains with reduced defect concentration and cleaner surfaces as precursors will likely improve the wear resistance of the resulting PCD via stronger individual grains and better sintering.

show abstract

Polycrystalline diamond cutters sintered with magnesium carbonate in cubic anvil press

Cited by 23 publications

References 11 publications

Unusual Mott transition in multiferroic PbCrO ₃

Unusual Mott transition in multiferroic PbCrO ₃

Characterisation of thermally degraded polycrystalline diamond

High-pressure, high-temperature plastic deformation of sintered diamonds

Contact Info

Product

Resources

About

Polycrystalline diamond cutters sintered with magnesium carbonate in cubic anvil press

Cited by 23 publications

References 11 publications

Unusual Mott transition in multiferroic PbCrO 3

Unusual Mott transition in multiferroic PbCrO 3

Characterisation of thermally degraded polycrystalline diamond

High-pressure, high-temperature plastic deformation of sintered diamonds

Contact Info

Product

Resources

About

Unusual Mott transition in multiferroic PbCrO ₃

Unusual Mott transition in multiferroic PbCrO ₃