Diamond polycrystalline composite material and its properties

Diamond Composites Produced from Fluorinated Mixtures of Micron-Sized and Nanodiamonds by Metal Infiltration

“…However, the implementation of this strategy is complicated by the possibility of the diamond for undergoing a reverse phase transition to graphite (graphitization), occurring at high temperatures, in the pores between diamond particles. Although the pressure in the points of contact of diamond grains can exceed 100 GPa [ 15 ], it is significantly lower in the pores between diamond particles than in the surrounding media of the high-pressure cell.…”

“…It has been shown [ 15 ] that at sintering conditions of 8 GPa and 1800 °C the penetration depth of nickel into the layer of micron-sized diamonds after 9 s of exposure was two times larger than that of cobalt. To infiltrate nickel into diamond layers in this work, a nickel foil was placed onto the surface of a 3 mm tablet.…”

“…It was shown [ 15 ] that at pressure of 8 GPa and temperature of 1800 °C, the nickel melt wetted the surface of graphite and diamond better than the cobalt melt, so the depth of nickel penetration into the microdiamond layer was two times higher than that of cobalt. Accordingly, nickel-bonded diamond composites showed higher strength; however, their wear resistance was inferior to cobalt-bonded composites during the sandstone turning.…”

Особливості Формування В Умовах Нрнт Гібридного Алмазного Полікристалічного Композиту, Що Армований CVD Алмазом Різної Структурної Досконалості

“…One of the promising areas for obtaining hybrid polycrystalline composites based on diamond is sintering diamonds of different genesis to produce hybrid materials, which, in particular, will combine the high physical and mechanical characteristics of static synthesis diamond powders and CVD diamonds [5].…”

Diamond polycrystalline composite material with dispersion-hardened nickel-based additive

“…To produce DPCMs having high (up to 1500 K) thermostability, silicon is used as a sintering aid, while to sinter DPCMs for tools operating under the heaviest conditions cobalt is used. However, the high cost and shortage of this metal as well as the ecological aspects of its use stimulated a number of attempts to replace it by another metal of approximate properties, nickel in particular [1].…”