高压物理学报2026，Vol.40Issue(9)：116-128,13.DOI:10.11858/gywlxb.20251233
梯度结构对PDC齿综合性能的影响
Role of Gradient Structure in the Integrated Performance of PDC Cutters
摘要
Abstract
Addressing the urgent demand for high-performance polycrystalline diamond compact(PDC)cutters in deep/ultra-deep oil and gas exploration,this work optimized the PDC synthesis formulation through orthogonal experimental design.Under high pressure conditions(8.5 GPa and 1 750℃),we successfully fabricated both conventional homogeneous mixed PDC cutter(H-PDC)and gradient-structured PDC cutter(G-PDC)featuring a"fine-grained work layer/coarse-grained transition layer"structure.Microstructural characterization reveals that the gradient structure facilitates uniform distribution of cobalt binder,suppresses cobalt aggregation,enhances interlayer interfacial bonding,and generates higher residual compressive stress.The cobalt mass fraction in the G-PDC work layer is 9.16%.After acid leaching for cobalt removal,the cobalt mass fraction decreased to 2.49%.Performance evaluations demonstrate that G-PDC achieves a wear resistance lifespan of 920 passes,superior to H-PDC(800 passes).The average impact toughness of G-PDC reaches 740.0 J,representing approximately 107%improvement over H-PDC.Furthermore,the gradient structure alleviates thermal expansion mismatch,increasing the thermal stability temperature by about 30℃.This research confirms that combining high pressure synthesis technology with gradient structural design can synergistically enhance the wear resistance,impact toughness,and thermal stability of PDC cutters,providing a viable pathway for developing next-generation superhard composites for extreme conditions.关键词
聚晶金刚石复合片/梯度结构/冲击性能/耐磨性能/热稳定性/高压烧结Key words
polycrystalline diamond compact(PDC)/gradient structure/impact performance/wear resistance/thermal stability/high pressure sintering分类
数理科学引用本文复制引用
高俊,王海阔,张治财,侯志强,王超,李好,杨易侃,杨娇,方锐,唐垚..梯度结构对PDC齿综合性能的影响[J].高压物理学报,2026,40(9):116-128,13.基金项目
国家自然科学基金(52073254) （52073254）
