Ni-Ti-B粘结剂体系增强PDC的耐热性研究
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摘要
聚晶金刚石复合片(Polycrystalline Diamond Compact,PDC)既具备超高硬度以及超高耐磨性,又具备高强度和抗冲击韧性而被广泛应用于钻探领域。但常规的PDC热稳定性较差,在钻进坚硬、强研磨性岩层时性能显著降低。为提高PDC的热稳定性,按6Ni-4Ti-2B比例将Ni、Ti、B等粉末与金刚石微粉混合,采用溶渗-粉末混合烧结方法,使用6×1200MN六面顶压机进行烧结,参数为压力5.0～6.5GPa、温度1350℃～1650℃、保温保压时间5～7min。对烧结后PDC试样进行扫描电镜分析、能谱分析及X射线衍射分析,观察PDC复合界面烧结情况,发现金刚石聚晶烧结情况良好,粘结剂分布均匀,生成了Co_xW_xC固溶体和TiB_2-Ni金属陶瓷复合相等耐热相。为检验PDC耐热性进行差重热重分析,测试结果表明添加Ni、Ti、B的PDC耐热性达到920℃,与传统PDC(～760℃)相比提高了160℃。
Polycrystalline Diamond Compact(PDC) cutter has been widely applied to rock drilling due to its high hardness, high abrasive resistance, and high strength. However, the conventional PDC has a poor thermal stability, which makes it is not suitable for drilling in hard rock formations with strong abrasiveness. In this study, to improve the heat resistance of PDC, the powders of Ni, Ti, and B at a ratio of 6∶4∶2 were mixed with diamond powder. The PDC sample had been sintered at pressures of 5.0～6.5 GPa, temperatures of 1350℃～1650℃ and time of 5-6 minutes in a 6×1200 MN cubic anvil press. The images of SEM and EDS indicated that the polycrystalline diamond was sintered completely and the binders were distributed evenly. The XRD and TG-DSC graphs demonstrated that the heat resistant phases CoxWxC solid solution and TiB_2-Ni metal-ceramic composite had been synthetized. As a result, the heat resistance of PDC was enhanced up to 920℃, which was 160℃ higher than conventional PDC(～760℃).
Polycrystalline Diamond Compact(PDC) cutter has been widely applied to rock drilling due to its high hardness, high abrasive resistance, and high strength. However, the conventional PDC has a poor thermal stability, which makes it is not suitable for drilling in hard rock formations with strong abrasiveness. In this study, to improve the heat resistance of PDC, the powders of Ni, Ti, and B at a ratio of 6∶4∶2 were mixed with diamond powder. The PDC sample had been sintered at pressures of 5.0～6.5 GPa, temperatures of 1350℃～1650℃ and time of 5-6 minutes in a 6×1200 MN cubic anvil press. The images of SEM and EDS indicated that the polycrystalline diamond was sintered completely and the binders were distributed evenly. The XRD and TG-DSC graphs demonstrated that the heat resistant phases CoxWxC solid solution and TiB_2-Ni metal-ceramic composite had been synthetized. As a result, the heat resistance of PDC was enhanced up to 920℃, which was 160℃ higher than conventional PDC(～760℃).
引文
[1] Irifune T, Kurio A, Sakamoto S, et al. Materials: Ultrahard polycrystalline diamond from graphite[J]. Nature, 2003, 421(6923):599-600.
[2] 柴津秋,王光祖. PDC的主要特性与应用[J]. 超硬材料工程,2007,19(5):40-41.
[3] William HD, Friedel SK. Method for Fabricating a Rotary Drill Bit and CompositeCompact Cutters Therefor. US Patent 4156329, May 29; 1979.
[4] Bellin F, Dourfaye A, King W, Thigpen M. The current state of PDC bit technology[J]. World Oil. 2010,231(9):41-46.
[5] Gu J, Huang K. Role of cobalt of polycrystalline diamond compact (PDC) in drilling process[J]. Diamond & Related Materials, 2016, 66:98-101.
[6] Palosz B, Stelmakh S, Grzanka E, et al. Origin of macrostrains and microstrains in diamond-SiC nanocomposites based on the core-shell model[J]. Journal of Applied Physics, 2007, 102(7):954.
[7] Qian J, Zerda T W, He D, et al. Micron diamond composites with nanocrystalline silicon carbide bonding[J]. Journal of materials research, 2003,18(5): 1173-1178.
[8] Zou B, Huang C, Song J, et al. Effects of sintering processes on mechanical properties and microstructure of TiB2-TiC+8 wt% nano-Ni composite ceramic cutting tool material[J]. Materials Science & Engineering A, 2012,540(10):235-244.
[2] 柴津秋,王光祖. PDC的主要特性与应用[J]. 超硬材料工程,2007,19(5):40-41.
[3] William HD, Friedel SK. Method for Fabricating a Rotary Drill Bit and CompositeCompact Cutters Therefor. US Patent 4156329, May 29; 1979.
[4] Bellin F, Dourfaye A, King W, Thigpen M. The current state of PDC bit technology[J]. World Oil. 2010,231(9):41-46.
[5] Gu J, Huang K. Role of cobalt of polycrystalline diamond compact (PDC) in drilling process[J]. Diamond & Related Materials, 2016, 66:98-101.
[6] Palosz B, Stelmakh S, Grzanka E, et al. Origin of macrostrains and microstrains in diamond-SiC nanocomposites based on the core-shell model[J]. Journal of Applied Physics, 2007, 102(7):954.
[7] Qian J, Zerda T W, He D, et al. Micron diamond composites with nanocrystalline silicon carbide bonding[J]. Journal of materials research, 2003,18(5): 1173-1178.
[8] Zou B, Huang C, Song J, et al. Effects of sintering processes on mechanical properties and microstructure of TiB2-TiC+8 wt% nano-Ni composite ceramic cutting tool material[J]. Materials Science & Engineering A, 2012,540(10):235-244.