Добірка наукової літератури з теми "Hard-phase synthesis"

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Статті в журналах з теми "Hard-phase synthesis"

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Saito, Tetsuji, and Masaki Ichihara. "Synthesis and magnetic properties of Sm5Fe17 hard magnetic phase." Scripta Materialia 57, no. 6 (September 2007): 457–60. http://dx.doi.org/10.1016/j.scriptamat.2007.05.037.

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Chen, Z. S., W. P. Yang, and C. W. Macosko. "Polyurea Synthesis and Properties as a Function of Hard-Segment Content." Rubber Chemistry and Technology 61, no. 1 (March 1, 1988): 86–99. http://dx.doi.org/10.5254/1.3536179.

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Abstract High-molecular-weight linear polyureas of different hard-segment content are obtained with a two-step solution polymerization. Elimination of water, careful choice of solvent, reactant concentration, and good control of reaction temperature are essential to obtain satisfactory results. We have studied the influence of the hard-segment content on the mechanical, dynamic-mechanical, and thermal properties of these solution polymerized amine-terminated polypropylene-oxide-based thermoplastic polyureas. Two-phase morphology is predominant within the range of the hard-segment concentration studied. Inversion of the continuous and dispersed phase might occur in the polyurea series at about 60 wt.% of hard segment. This changes the nature of the polyureas from a tough elastomeric material to a more brittle, high-modulus plastic. The modulus of the rubbery plateau measured from dynamic-mechanical spectra increases with hard-segment concentration due to the reinforcing effect of hard-segment domains. However, continuous improvement in dynamic-mechanical modulus is not significant when the hard segment is above 50 wt.% due to higher degree of phase mixing in high hard-segment concentration systems. The amount of solubilized hard segment in the soft-segment phase in these polyureas is limited as judged from the relatively constant soft-segment Tg. However, the extent of phase separation, as determined by the heat capacity change ΔCp across the soft-segment Tg, decreases with increasing hard-segment content. The same characterizations and analyses have also been carried out on a series of RIM produced polyurea samples of the same composition. Great difference in properties is observed in comparison of these two sets of samples due to their different synthesis routes. In general, samples produced by RIM exhibit lower molecular weight, lower dynamic-mechanical modulus, higher soft-segment Tg, more phase-mixed, and more tensile elongation than those synthesized by solution polymerization. The detailed comparison will be treated in a separate paper.
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Tsonev, Tsvetomir, Michael Herzog, and Sanchi Nenkova. "Shape memory polyurethanes based on recycled polyvinyl butyral. I. Synthesis and morphology." Open Chemistry 11, no. 12 (December 1, 2013): 2058–65. http://dx.doi.org/10.2478/s11532-013-0331-3.

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AbstractShape memory polyurethanes (SMPUs) were synthesized by 4,4′-diphenylmethane diisocyanate (MDI), hexane-1,6-diol (HD), polypropylene glycol (PPG), and recycled polyvinyl butyral (PVB). Dynamic mechanical analysis, differential scanning calorimetry and Fourier transformation infrared attenuated total reflection spectroscopy was used to characterize the poly (vinylbutyral-urethanes). Micro-phase domain separation of hard and soft segments and phase inversion were investigated. Increasing the hard segment content, i.e., average hard segment molecular weight, leads to an increase in the degree of micro-phase separation, hard domain order and crystallinity. The crystalline hard segment structures combined with the elastic nature of soft segment matrix provide enough physical and chemical crosslinks to have shape memory effect.
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Volodchenkov, A. D., Y. Kodera, and J. E. Garay. "Synthesis of strontium ferrite/iron oxide exchange coupled nano-powders with improved energy product for rare earth free permanent magnet applications." Journal of Materials Chemistry C 4, no. 24 (2016): 5593–601. http://dx.doi.org/10.1039/c6tc01300g.

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Fan, Quan Run, and Feng Pan. "Technology Mapping for Heterogeneous FPGA in Different EDA Stages." Applied Mechanics and Materials 229-231 (November 2012): 1866–69. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.1866.

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In traditional EDA flow, Technology mapping is performed after logic synthesis. Besides programmable logic blocks, heterogeneous FPGAs also have some hard blocks, such as memory block and multiplier, built in it. After logic synthesis, it will be difficult for technology mapping to find sub-circuits that can be implemented in hard blocks. In this paper, a systematic technology mapping approach is proposed. In the design phase, with the support of CAD tools, a module based design approach is used to map some design block to large hard blocks. During register transfer level synthesis, some functions that are suitable to be implemented in small hard blocks are identified. Other logic functions are mapped into lookup tables with different input size.
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Farzaliyev, V. M., and M. N. Aliyeva. "Feature analysis of vapor-phase chromatography of high boiler organic compounds." Azerbaijan Oil Industry, no. 4 (April 15, 2020): 40–47. http://dx.doi.org/10.37474/0365-8554/2020-4-40-47.

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The paper presents the physical-chemical features of the vapor-phase chromatography method for the analysis of polar high boiler organic compounds. The application conditions of vapor-phase chromatography for the research of petrochemical synthesis products are analyzed. The mechanism of chromatographic seperation of compounds in the vapor-liquid-solid phase system is reviewed. The physical-chemical parameters of application of vapor-phase chromatography are provided. It is shown that liquid crystals can be used for the efficiency increase of the analysis of high boiler organic compounds as hard carriers. Thus, isomer compounds in the flow of water steam may be seperated. The usage of water-formamide mixture as a gas carrier enables the analysis of high boiler amine-based organic compounds. Natural, modified zeolite-containing tuff, diatoms and zeolites can be used as adsorbents and hard carriers in the separation of high boiler products of petrochemical synthesis.
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NOMIZU, MOTOYOSHI, YOSHIMASA INAGAKI, TAKEYOSHI YAMASHITA, AKO OHKUBO, AKIRA OTAKA, NOBUTAKA FUJII, PETER P. ROLLER, and HARUAKI YAJIMA. "Two-step hard acid deprotection/cleavage procedure for solid phase peptide synthesis." International Journal of Peptide and Protein Research 37, no. 2 (January 12, 2009): 145–52. http://dx.doi.org/10.1111/j.1399-3011.1991.tb00095.x.

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Tavakolinia, Faezeh, Mohammad Yousefi, Seyyed Afghahi, Saeid Baghshahi, and Susan Samadi. "Synthesis of novel hard/soft ferrite composites particles with improved magnetic properties and exchange coupling." Processing and Application of Ceramics 12, no. 3 (2018): 248–56. http://dx.doi.org/10.2298/pac1803248t.

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SrFe12O19/Zn0.4Co0.2Ni0.4Fe2O4 hard/soft ferrite composite particles with 20, 40, 60 and 80 wt.% of soft phase were prepared by one-pot sol-gel auto-combustion and physical mixing methods. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and vibrating sample magnetometer (VSM) were used to characterize the structural and magnetic properties of the samples. XRD spectrum revealed the formation of mixed ferrite phases in the composite particles. The hysteresis loops of the samples showed the presence of exchange coupling between the hard and soft ferrites. The composite particles with 20 and 60 wt.% of the soft phase demonstrated the highest Mr/Ms ratio, i.e. 0.29 and 0.28, respectively. In addition, the highest Ms, Mr and Hc were achieved in the composite particles with 40, 60 and 20 wt.% of the soft phase, respectively. Compared to the physical mixing method (PM), the composite particles prepared by the sol-gel auto-combustion method (OP) demonstrated better magnetic properties. The exchange coupling interaction between the hard and soft ferrite phases was similar in both methods. These composite particles exhibited magnetically single phase behaviour, however, the saturation magnetization was lower in the physical mixing pared to that of the one-pot method.
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Tang, Weiming, Richard J. Farris, William J. MacKnight, and Claus D. Eisenbach. "Segmented Polyurethane Elastomers with Liquid Crystalline Hard Segments. 1. Synthesis and Phase Behavior." Macromolecules 27, no. 10 (May 1994): 2814–19. http://dx.doi.org/10.1021/ma00088a023.

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Grass, Robert N., Stavros Tsantilis, and Sotiris E. Pratsinis. "Design of high-temperature, gas-phase synthesis of hard or soft TiO2 agglomerates." AIChE Journal 52, no. 4 (2006): 1318–25. http://dx.doi.org/10.1002/aic.10739.

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Дисертації з теми "Hard-phase synthesis"

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Пітак, Ярослав Миколайович. "Вогнетривкі та жаростійкі неформовані матеріали на основі композицій системи RO – R₂O₃ – RO₂ – P₂O₅". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2005. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40380.

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Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.17.11 – технологія тугоплавких неметалічних матеріалів. – Національний технічний університет “Харківський політехнічний інститут”, Харків, 2005. Дисертація присвячена розробці наукової концепції створення вогнетривких та жаростійких неформованих матеріалів на основі композицій системи RO – R₂O₃ – RO₂ – P₂O₅. Досліджено субсолідусну будову чотирикомпонентних систем: M–A–S–P, C–А–S–P, Zn–Z–S–B, Zn–A–Z–S, C–M–S–P, A–Z–S–P, M–Z–S–P, C–A–S–B, C–A–Z–S, C–M–A–S, C–Sr–A–Z. Визначено співіснуючі фази в системах, виконано триангуляцію потрійних підсистем та тетраедрацію чотирикомпонентних систем, визначено їх об’єми та ступінь асиметрії, побудовано топологіч-ний граф взаємозв’язку елементарних тетраедрів, надано геометро-топологічну характеристику фаз систем, проведено оцінку евтектичних температур в перерізах систем та побудовано поверхні ліквідусу перетинів. На підставі фізико-хімічних досліджень систем розроблено принципи одержання нових вогнетривких та жаростійких неформованих матеріалів. Розроблені нові склади вогнетривких теплоізоляційних матеріалів, жаростійких та вогнетривких цементів та бетонів на їх основі, набивних мас з високими фізико-механічними та технічними властивостями. Встановлено закономірності фазоутворення, та розроблено принципи одержання цих матеріалів.
Thesis for Doctor of Technical Sciences degree on the speciality 05.17.11 – technology of refractory not metal materials. – National Technical University “Kharkiv Polytechnic Institute”, Kharkiv, 2005. The thesis is devoted to develop scientific conception of creation of fire-resistant and heat resisting materials on the basis of the system RO – R₂O₃ – RO₂ – P₂O₅ compositions. The sub-solidus structure of the four component systems has been investigated: M–A–S–P, C–А–S–P, Zn–Z–S–B, Zn–A–Z–S, C–M–S–P, A–Z–S–P, M–Z–S–P, C–A–S–B, C–A–Z–S, C–M–A–S, C–Sr–A–Z. The co-existed phases in the systems have been determined, the tetrahedra for quaternary systems have been carried out, the volumes elementary tetrahedrons have been determined, the topological characteristic of phases of systems have been given. On the basis of physic-chemical researches of the systems the principles of reception new fire-resistant and heat resisting unforming materials have been developed. New compositions of materials on the base of refractories and cements with high physical, mechanical and technical properties have been developed. The principles of phase-formation have been set up and the principles of obtaining these materials have been worked out.
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Частини книг з теми "Hard-phase synthesis"

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André, Étienne. "IMITATOR 3: Synthesis of Timing Parameters Beyond Decidability." In Computer Aided Verification, 552–65. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81685-8_26.

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AbstractReal-time systems are notoriously hard to verify due to nondeterminism, concurrency and timing constraints. When timing constants are uncertain (in early the design phase, or due to slight variations of the timing bounds), timed model checking techniques may not be satisfactory. In contrast, parametric timed model checking synthesizes timing values ensuring correctness. takes as input an extension of parametric timed automata (PTAs), a powerful formalism to formally verify critical real-time systems. extends PTAs with multi-rate clocks, global rational-valued variables and a set of additional useful features. We describe here the new features and algorithms offered by 3, that moved along the years from a simple prototype dedicated to robustness analysis to a standalone parametric model checker for timed systems.
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Bunker, Bruce C., and William H. Casey. "Bio-inspired Synthesis of Oxide Nanostructures." In The Aqueous Chemistry of Oxides. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199384259.003.0015.

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Nature is capable of building magnificently intricate and detailed structures out of otherwise boring materials such as calcium carbonate and silica. Anyone who has taken their children to see dinosaurs at a Natural History museum or visited natural wonders such as the Petrified Forest in Arizona are familiar with the natural process called fossilization by which the tissues of dead organisms are eventually replicated by objects of stone. Most living organisms (including humans) are critically dependent on more deliberate and controlled biomineralization phenomena that lead to the production of all hard tissues, including our teeth and bones, seashells and diatom skeletons, egg shells, and the magnetic nanoparticles that provide homing devices from bacteria to birds. All these processes are nothing more than specific examples of highly controlled nucleation and growth phenomena such as those described in generic terms in Chapter 7. At a molecular level, these processes are controlled by the same reaction mechanisms involving oxide surfaces, which were outlined in Chapter 6. However, biomineralization is orders of magnitude more sophisticated than standard nucleation and growth processes. The unique features of biomineralization involve the interplay between organic biomolecules and the nucleation and growth of inorganic phases such as oxides. This interplay is of critical importance in both biology and emerging nanotechnologies, providing specific examples that illustrate many of the concepts of oxide chemistry introduced in Chapters 5 through 7. In this chapter, we highlight the key concepts of biomineralization and provide examples of how researchers can now produce complex nanostructured oxides via biomimetic nucleation and growth strategies that replicate some of the key features used to make hard tissues in living systems. These strategies include the use of (1) molecular complexation and compartmentalization to control supersaturation levels, (2) specific ligands and surface structures to mediate nucleation phenomena, (3) hierarchical self-assembled organic architectures as templates for oxide formation, (4) functionalization to stimulate desired heterogeneous nucleation and growth processes on those templates, and (5) organic surfactants to manipulate both crystal-phase preferences and growth habits.
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Тези доповідей конференцій з теми "Hard-phase synthesis"

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Deuerler, F., H. Gruner, M. Pohl, and L. Tikana. "Auswirkungen der Abscheidebedingungen auf das Kavitationsverhalten von Plasmajet-CVD-Diamantschichten (Effects of the Conditions of Diamond Synthesis on the Cavitation Behaviour of Plasma Jet CVD Diamond Coatings)." In ITSC 1999, edited by E. Lugscheider and P. A. Kammer. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 1999. http://dx.doi.org/10.31399/asm.cp.itsc1999p0163.

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Abstract Diamond films have been deposited on WC - 6% Co hard metal tools by the DC plasma jet CVD synthesis. The parameters of the process (gas composition, temperature of the gas phase and the substrate, process pressure) as well as of the substrate surface (material, pretreatment) are related to the diamond film growth. For machining abrasive materials the hard and wear resistant diamond coatings must adhere good to the substrate. The wear behaviour of thin diamond films on hard metals under cavitation treatment has been examined. Thus the conditions of diamond synthesis have been varied especially concerning the coating duration and the process pressure and engineering. The cavitation test reacts more sensitive to coating defects of pm size than the conventional testing methods (scratch test, indenter method) and considers the microstructure of the material. Paper text in German.
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Mazurek, Grzegorz. "The Viscoelastic Characteristics of the Asphalt Concrete Modified with Different Synthetic Waxes Using a Modified Huet- Sayegh Model." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.141.

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The article presents the results of dynamic modulus tests carried on the asphalt concrete (AC16W). The sinusoidal load was applied to the samples in accordance with DTC-CY method. The neat bituminous binder (penetration grade 35/50) was modified by means two synthetic waxes, coming from the Fischer-Tropsch raction, with various molecular weights and softening point temperature results (hard and softer). The relaxation phenomenon in terms of changes in complex modulus and phase angle was evaluated using the modified Huet-Sayegh (2S2P1D). Estimated model parameters pointed out that the addition of the synthetic wax with the high (hard wax) and the low (softer wax) molecular weight raised the stiffness of the bituminous binder in relation to the reference bitumen 35/50. The application of the modified Huet-Sayegh model showed that the presence of the synthetic wax in the bitumen significantly affected the stiffness modulus of considered asphalt concretes. Basing analysis on Cole-Cole diagram it was found significant differences in the viscoelastic behaviour between the reference asphalt concrete and the asphalt concretes with synthetic waxes. In contrast, there were no significant differences between viscoelastic properties of tested asphalt concretes modified, used in the experiment, synthetic waxes. Furthermore, the sensitivity to the loading time of asphalt concretes containing both synthetic waxes was marginal.
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Zhong, Hanyi, Xiangzheng Kong, Zhengsong Qiu, Weian Huang, Xianbin Zhang, and Chong Zhao. "Effect of Nano Carbon Spheres on the Properties of Oil-Based Drilling Fluids under High Temperature Conditions." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21404-ms.

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Abstract Owing to superior temperature stability in comparison with water-based drilling fluids, oil or synthetic-based drilling fluids are generally preferred for high temperature and high pressure (HTHP) formations. However, the thermal degradation of emulsifiers and polymeric components under HTHP conditions that results in loss of rheological and filtration control, barite sag or even fluid phase separation also occurs. It is a challenge to sustain these properties stable under such harsh condition. Since nanoparticles have potential to provide better thermal stability, improved filtration loss as well as emulsion stability, the aim of this study is to investigate the effect of nano carbon spheres on the properties of oil-based drilling fluids under high temperature conditions. The nano carbon spheres were synthesized with the hydrothermal reaction of glucose. The influence of nano carbon spheres on the rheological, filtration, emulsion stability, settlement stability, as well as lubricity of a typical mineral oil-based drilling fluid with oil to water ratio of 80:20 was investigated before and after thermal aging at 180 and 200°C, respectively. The structure characterization showed that the uniform hard nano carbon spheres exhibited intermediate wettability. Laboratory performance test indicated that, for the oil-based drilling fluid, the addition of nano carbon spheres improved the rheological properties in terms of yield point and the ratio of yield point to plastic viscosity, which is beneficial for transporting of drilling cuttings. After thermal aging at 200 °C, the filtration loss volume was reduced as high as 70%, and desirable filter cake quality was obtained by incorporation of 1.0 wt% spheres, meanwhile the electrical stability was improved both before and after thermal aging. Furthermore, the fluid formulated with the nano carbon spheres generated better barite sag control. The polarizing microscope observation showed that the nano carbon spheres accumulated at the water-oil interface and formed a steric barrier which probably explained the reason of the above enhanced performance. The green synthetic routes and environmental friendly characteristics of the nano carbon spheres, in combination with the excellent properties suggested that the nano carbon spheres hold potential as multi-functional additives for formulating oil-based drilling fluids for HTHP drilling operations.
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Sandri, Monica, Michele Iafisco, Silvia Panseri, Elisa Savini, and Anna Tampieri. "Fully Biodegradable Magnetic Micro-Nanoparticles: A New Platform for Tissue Regeneration and Theranostic." In ASME 2013 2nd Global Congress on NanoEngineering for Medicine and Biology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/nemb2013-93223.

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Nowadays, magnetic materials are receiving special attention due to their potential applications in different fields and in particular in medicine. Magnetic micro-nano-particles have been progressively employed as support materials for enzyme immobilization, and have been used as drug-delivery vehicles, contrast agents for magnetic resonance imaging as well as heat mediators for hyperthermia-based anti-cancer treatments and many other exciting biomedical applications. Magnetic materials have also attracted a big interest in the field of bone tissue regeneration because it has been demonstrated that magnetic nanoparticles have effect of osteoinduction even without external magnetic force. Therefore, one of the most big challenge in this field is the production of magnetic materials with good biocompatibility and biodegradability. In fact, the long-term effects in the human body of iron oxide (maghemite or magnetite), the most popular magnetic phase used in medicine and biotechnology, are not yet completely assessed. To this aim, in this work we developed an innovative biocompatible and bioresorbable superparamagnetic-like phase by doping nano-hydroxyapatite with Fe2+/Fe3+ ions (FeHA). Moreover the same magnetic nanoparticles were used as nano-particulate emulsifier for the preparation of hollow hybrid Fe-HA-poly(L-lactic) acid (PLLA) micro-nano-spheres. PLLA has been used because poly(α-hydroxy-esters) are the most frequently used synthetic polymers for biomedical applications owing to their biocompatibility, hydrolytic degradation process and proper mechanical properties. These micro-nanospheres could be used as new type of scaffold for hard tissue regeneration. In fact, spherical scaffold display several advantages respect to the monolithic counterpart e.g., (i) improving control over sustained delivery of therapeutic agents, signalling biomolecules and even pluripotent stem cells, (ii) serving as stimulus-sensitive delivery vehicles for triggered release, (iii) introducing porosity and/or improve the mechanical properties of bulk scaffolds by acting as porogen or reinforcement phase, (iv) supplying compartmentalized micro-reactors for dedicated biochemical processes, (v) functioning as cell delivery vehicle, and, finally, (vi) giving possibility of preparing injectable and/or mouldable formulations to be applied by using minimally invasive surgery. Moreover, the same magnetic materials could find applications in nanomedicine as a multifunctional carrier. Their magnetic functionality could be utilized to move them into the body towards target organs by an external magnetic field. Furthermore, the superparamagnetic feature of the nanoparticles could allow to tailor the release of the therapeutic agent by switching (on-off) the external magnetic field and/or to treat cancer cells by hyperthermia.
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Zhan, Guodong David, Chinthaka Gooneratne, Timothy Eric Moellendick, Duanwei He, Jianhui Xu, and Alawi Alalsayednassir. "Ultra-Strong and Catalyst-Free Polycrystalline Diamond Cutting Materials for One-Run-To-TD Game-Changing Drilling Technology." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21342-ms.

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Abstract Polycrystalline diamond compact (PDC) bits have been increasing their application drilling many formations in the past 20+ years. However, their performance in drilling very hard, abrasive and interbedded formations still needs improvement. The main weak point comes from their primary cutting elements, PDC cutters, which still need improvements of wear resistance, impact resistance, and thermal stability. During the traditional manufacturing of the PDC cutters, cobalt catalyst has to be used to lower the pressure and temperature. In this study, we developed an ultra high pressure and high temperature (UHPHT) technology to make the PDC cutters without metallic catalyst into reality. Through this development, we can generate pressures of 14 GPa-35 GPa, which is three to seven times of that in the traditional PDC cutter manufacturing technology. In addition, the extreme high temperatures ranging from 1,900 °C to 2,300 °C are achieved, which is 500-900 °C higher than that in traditional process. Using this UHPHT technology, we successfully processed ultra-strong and catalyst-free PDC materials with two high pressures at 14 GPa and 16 GPa, respectively, to study the different responses of the material properties from different processing parameters. The new process applied industry available micro-sized synthetic diamond powders as starting material to eliminate the large volume shrinkage in phase transformation from graphite to diamond which is typically experienced in traditional manufacturing process. The hardness of the 14-GPa CFPCD materials reaches the top limit of the single crystal diamond, more than double that of the traditional PDC cutters. The material also possesses the near-metallic fracture toughness – more than two times of the traditional PDC cutters. Furthermore, the 16-GPa CFPCD material breaks all four single crystal diamond indenters in Vickers hardness tester, an indication of the world's hardest material in the family of diamonds. As a result, the material exhibits industry-recorded wear resistance and thermal stability. The combination of these breakthrough properties of the new CFPCD materials activates the goal in the effort of "One-Run-To-TD" in drilling operation, after the implementation of CFPCD materials as PDC cutters for PDC drill bits.
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