Abstract The objective of this research was to obtain a triple layer Polycrystalline Diamond Compact (PDC) via the High-pressure High-temperature (HPHT) sintering method. A thin layer of WC with 20 wt% Nb/Ni was used as an interface between the top layer of Polycrystalline Diamond (PCD) with pure Nb binder and WC 10 wt% Co substrate. Sintering was performed at 1750 °C under 7.7 GPa of pressure. Microhardness variation was measured and microstructural/structural studies were done via SEM/EDS and XRD. The overall results showed that this new kind of PDC can be produced successfully using pure niobium as a binder for the PDC layer and no sign of graphitization was detected. It was also found that using an interface having the resemblance to both substrate and sintered diamond body caused good adhesion between layers that can potentially enhance performance and durability of PDC.

中文翻译：

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新型三层多晶金刚石复合片的开发

摘要 本研究的目的是通过高压高温（HPHT）烧结方法获得三层多晶金刚石复合片（PDC）。具有 20 wt% Nb/Ni 的 WC 薄层用作具有纯 Nb 粘合剂的多晶金刚石 (PCD) 顶层和 WC 10 wt% Co 基材之间的界面。烧结在 1750 °C 和 7.7 GPa 压力下进行。测量显微硬度变化，并通过 SEM/EDS 和 XRD 进行显微结构/结构研究。总体结果表明，这种新型 PDC 可以使用纯铌作为 PDC 层的粘合剂成功生产，并且未检测到石墨化迹象。