首页|碳纳米管对PDC热稳定性及力学性能的影响

碳纳米管对PDC热稳定性及力学性能的影响

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由于现代石油、煤田开采的环境愈加复杂,对钻头的耐热性与抗冲击韧性提出了更高的要求.而聚晶金刚石复合片(polycrystalline diamond compact,PDC)作为钻头工作的核心零部件,会直接影响钻头的使用寿命.在实际的工况中,PDC往往会以断裂和耐热性差的形式失效.碳纳米管具有优异的力学性能、化学稳定性和热稳定性,将碳纳米管引入PDC层中,可以解决PDC中抗冲击韧性差、热稳定性差的问题.本研究采用碳纳米管作为PDC的增强相,在高压和高温(5.5 GPa和1300 ℃)的条件下制备PDC复合材料,烧结时间为90s.对PDC复合材料的微观结构、元素分布、相组成进行了表征,分析了碳纳米管对复合材料力学性能和热稳定性的影响.结果表明,碳纳米管添加量为1.4%(质量分数)的PDC抗冲击韧性从400 J提升到550 J,比原始PDC的抗冲击韧性高37.5%,PDC复合材料抗冲击韧性的提高归因于碳纳米管在裂纹偏转过程中的拔出和桥接.碳纳米管添加量为1.6%的PDC耐热性从原始的704 ℃提高至813 ℃,摩擦系数从0.064降低到了 0.048,磨耗比达到159.69×104,比原始PDC提高了 59.64×104.
Effect of Carbon Nanotubes on Thermal Stability and Mechanical Properties of PDC
The higher requirements are proposed for the thermal stability and impact toughness of drill bits due to the increasingly complex environment of modern oil and coal mining.Polycrystalline diamond composite sheet(PDC)is the core parts of the drill and has a direct impact on the service life of the drill.The PDC always fails in actual working conditions owing to poor thermal stability and fracture.Carbon nanotubes have excellent mechanical properties,chemical stability and thermal stability.Carbon nanotubes are introduced into PDC layer,which can solve the problems of poor impact toughness and poor thermal stability of PDC.Carbon nanotubes were used as the reinforcing phase and added into PDC.PDC composites were prepared under high pressure and high temperature(5.5 GPa and 1300 ℃),and the sintering time was 90 s.The effects of carbon nanotubes on mechanical properties and thermal stability of PDC composites were analyzed,and the microstructure,element distribution and phase composition of PDC composites were characterized.The results show that the impact toughness of PDC with 1.4wt%carbon nanotubes increases from 400 J to 550 J,which is 37.5%higher than that of original PDC.The increase in impact toughness of PDC composites is attributed to the removal and bridging of carbon nanotubes during crack deflection.The thermal stability of PDC with 1.6wt%carbon nanotubes increases from 704 ℃ to 813 ℃,and the friction coefficient decreases from 0.064 to 0.048.The wear ratio reaches 159.69×104,which is 59.64×104 higher than that of the original PDC.

polycrystalline diamond compactcarbon nanotubeimpact toughnessthermal stabilityfriction coefficient

高中堂、段迪、彭腊梅、丰德友、王斌奇、高志明

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西安科技大学机械工程学院,陕西西安 710054

陕西太合智能钻探有限公司,陕西西安 712000

聚晶金刚石复合片 碳纳米管 抗冲击韧性 热稳定性 摩擦系数

国家自然科学基金国家自然科学基金烟台先进材料与绿色制造山东省实验室基础研究开放课题西安市科学计划项目中国博士后基金陕西省重点研发计划项目清华大学摩擦学国家重点实验室开放课题

5180425152104384AMGM2021F0421XJZZ00412020M683675XB2023-YBGY-343SKLTKF20B07

2024

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子:0.634
ISSN:1002-185X
年,卷(期):2024.53(8)