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Articles de revues sur le sujet « Co-Pressing »

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Auteur : Grafiati
Publié le 20 avril 2024

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1

Jia, Chengchang, Lan Sun, Hua Tang et Xuanhui Qu. « Hot pressing of nanometer WC–Co powder ». International Journal of Refractory Metals and Hard Materials 25, no 1 (janvier 2007) : 53–56. http://dx.doi.org/10.1016/j.ijrmhm.2005.11.003.

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2

SHI, XIAOLIANG, GANGQIN SHAO, XINGLONG DUAN et RUNZHANG YUAN. « RESEARCH ON SHAPING TECHNOLOGY OF NANOCOMPOSITE WC-6Co POWDER AND PROPERTIES OF SINTERED COMPACTS ». International Journal of Nanoscience 05, no 02n03 (avril 2006) : 233–38. http://dx.doi.org/10.1142/s0219581x06004292.

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The influences of powder extrusion molding (PEM), die pressing and cold isostatic pressing (CIP) on the green compacts and the sintered compacts of nanocrystalline WC-6 Co composite powder produced by spray pyrogenation-continuous reduction and carburization technology were researched. The results showed that the pore volume distribution, density and scanning electron microscopy (SEM) morphologies of fractured surface of powder extrusion molding or die pressing followed by the cold isostatic pressing consolidation green compacts were better than that of powder extrusion molding or die pressing. The green compacts were sintered by using vacuum sintering plus hot isostatic pressing (HIP), the sintered specimens were characterized by testing density, Rockwell A hardness, saturated magnetization, coercivity force, transverse rupture strength (TRS) and atomic force microscope (AFM) images, the results showed that sintered specimen of the green body that prepared by powder extrusion molding or die pressing followed by cold isostatic pressing had excellent properties of high strength and high hardness, transverse rupture strength of sintered specimen was more than 3100 MPa, Rockwell A hardness of sintered body was more than 93. Ultrafine WC-6 Co cemented carbide rods with excellent mechanical properties and fine microstructure were obtained.
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3

Liu, Tao, Xiangnan Wang, Xiaofang Zhang, Xiang Gao, Lin Li, Jingkun Yu et Xitao Yin. « A limiting current oxygen sensor prepared by a co-pressing and co-sintering technique ». Sensors and Actuators B : Chemical 277 (décembre 2018) : 216–23. http://dx.doi.org/10.1016/j.snb.2018.09.007.

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4

Sun, Lan, Cheng Chang Jia et Hua Tang. « Research on Two Sintered Techniques of Nanometer WC-Co Powder ». Materials Science Forum 534-536 (janvier 2007) : 593–96. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.593.

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This paper concerned with SPS (spark plasma sintering), hot pressing of sinter nanometer WC-Co powder and discussed the density, hardness, microstructures and grain sizes of the alloys sintered by different styles. The results showed that SPS could lower the sintering temperature, increased the density and circumscribed the growth of grain size of WC. Hot pressing sintering could produce high density alloys and play well on the grain growth, but its sintering temperature and sintering time were larger than SPS. Besides, the hardness of the sintered cemented alloys that was dependent on the grain size and densification could also be improved by SPS and hot pressing.
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5

Kim, H. G., H. M. Lee et K. T. Kim. « Near-Net-Shape Forming of Ceramic Powder Under Cold Combination Pressing and Pressureless Sintering ». Journal of Engineering Materials and Technology 123, no 2 (15 janvier 2001) : 221–28. http://dx.doi.org/10.1115/1.1354991.

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Near-net-shape forming of zirconia powder was investigated under the combination of cold die and isostatic pressing and pressureless sintering. A combination pressing technique, i.e., die compaction under cold isostatic pressing, allowed the forming of a complex shaped ceramic powder body with better dimensional control than that achieved by cold isostatic pressing and more uniform density distribution than that by die pressing. The constitutive models proposed by Kim and co-workers were implemented into a finite element program (ABAQUS) to simulate densification of ceramic powder under cold compaction and pressureless sintering. Finite element calculations were compared with experimental data for density distribution and deformation of zirconia powder compacts under cold combination pressing and pressureless sintering. Finite element results agreed well with experimental data.
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6

Bolokang, A. S., M. J. Phasha, D. E. Motaung et S. Bhero. « Effect of Mechanical Milling and Cold Pressing on Co Powder ». Journal of Metallurgy 2012 (2 février 2012) : 1–7. http://dx.doi.org/10.1155/2012/290873.

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Cold pressing (CP) of the amorphous-like Co powder suppressed most of the XRD peaks, in particular the peak along (100) plane. The DSC curve of unmilled CP Co powder has shown a distinct sharp exothermic peak at 615C°. Upon annealing at 700C°, only the FCC phase with lattice parameter of 3.51 Å was detected by XRD. Our results implied that the exotherm at 615C° corresponds to compaction-pressure-assisted HCP to FCC first-order phase transition. The XRD analysis of 30 h milled powder revealed for the first time the FCC phase with a=3.80 Å. However, due to presence of (100) and (210) peaks, this phase is thought to be FCT with lattice parameters a=b=3.80 and c=3.07 Å. Consequently, the high-energy milling carried out in the current work induced for the first time HCP to FCT transition in Co. Upon CP of milled powder, the lattice parameter a shrunk from 3.80 to 3.75 Å. However, during annealing of the CP milled Co powder at 750C°, the FCT to FCC transition occurred, yielding the FCC phase with a=3.51 Å.
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7

Zhao, Zhenye, Jianwei Liu, Huaguo Tang, Xianfeng Ma et Wei Zhao. « Cr3C2 doped W0.6Al0.4C0.8–Co hard alloys prepared by hot-pressing ». International Journal of Refractory Metals and Hard Materials 48 (janvier 2015) : 333–37. http://dx.doi.org/10.1016/j.ijrmhm.2014.10.004.

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8

Li, Kun, Hai Yan Chen, Qiu Shuang He et Li Hua Dong. « Microstructure and Properties of Hot-Pressing Sintered Tungsten Carbide Composites by Adding Cubic Boron Nitride ». Key Engineering Materials 655 (juillet 2015) : 45–48. http://dx.doi.org/10.4028/www.scientific.net/kem.655.45.

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(0, 5, 10, 15, 20) vol% CBN-WC/Co composites were consolidated by ball milling and the following hot-pressing sintering method. WC, Co and CBN powders were used as the starting materials. The effects of the CBN content on the density, microstructure and mechanical properties of CBN-WC/Co composites were investigated. The results showed that the CBN content had remarkable influence on the microstructure and mechanical properties of CBN-WC/Co Composites. With the increasing content of CBN, the density decrease, while Vickers hardness and flexural strength increased initially to the maximum values and then decreased at CBN 10 vol%. When 10 vol% CBN-WC/Co powders were hot-pressing sintered at 1350°C and 20MPa for 90 min, an excellent Vickers hardness of 19.8GPa was achieved, combining a flexural strength of 682MPa.
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9

Shen, Qian, Yi Long Ma, Jun Dong et Deng Ming Chen. « Preparation and Magnetic Properties of Nanocrystal Bulk SmCo7 Magnets ». Materials Science Forum 815 (mars 2015) : 276–80. http://dx.doi.org/10.4028/www.scientific.net/msf.815.276.

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Two kinds of 2:17R Sm-Co alloys, Sm2(Fe,Cu,Zr,Co)17 and pure binary Sm2Co17 were prepared, and the amorphous powder was prepared by high-energy ball milling Sm-Co alloys. The bulk nanocrystalline SmCo7 was prepared by hot-pressing the amorphous powder, and the magnetic properties and phase composition were studied. Initial Sm2(Fe,Cu,Zr,Co)17 showed a large value of coercivity while the pure Sm2Co17 almost showed no coercivity. However, after ball milling the grain size of alloys decreased dramatically until completely amorphous. Two kinds of alloys showed the different phase composition and magnetic properties after hot-pressing. It was found that the pure Sm2Co17 bulk magnet showed a high coercivity Hc and had the 1:7H phase. On the other hand, the Sm2(Fe,Cu,Zr,Co)17 showed high saturation magnetization Ms and very low Hc since the Fe-Co and Sm2Co3 phase were precipitated from the alloy.
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10

Zhao, Xianrui, Ze Yu, Dunwen Zuo, Qintao Li, Mengxian Zhang, Hongjun Wang, Qiangyong Zhang, Zhengyu Zhu, Yong Chen et Feng Xu. « The effect of various Co contents on the microstructure and properties of Ti(C,N)-TiB2-Co cermets prepared in situ via reactive hot pressing ». Advances in Mechanical Engineering 12, no 5 (mai 2020) : 168781402092571. http://dx.doi.org/10.1177/1687814020925716.

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Ti(C,N)-TiB2-Co cermets were in situ synthesized, via reactive hot pressing from the Co-Ti-C-BN system, with a Co content ranging from 6 to 22 wt%. The microstructure, relative density, hardness, and fracture toughness of the sintered compacts was investigated by light microscopy, scanning electron microscopy, ceramic densitometry, and Vickers hardness test. The investigations indicate that during hot pressing (compacting pressure = 30 MPa), when the Co content is 14–22 wt%, the metal binder is extruded. Co and Ti are included in the extrudate, breaking the original ratio and deteriorating the properties of the sintered products. As the Co content increases from 6 wt% to 12 wt%, the porosity increases, and the relative density increases from 97.2% to 99.5%. The fracture toughness increases from 6.1 to 6.8 MPa m1/2. The Vickers hardness first increases from 1897 HV10 to the maximum 1960 HV10 and then decreases slightly to 1945 HV10.
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11

Ur, Soon Chul, Joon Chul Kwon et Il Ho Kim. « Effect of Fe Doping on Thermoelectric Properties of Mechanically Alloyed CoSb3 ». Materials Science Forum 534-536 (janvier 2007) : 177–80. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.177.

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Fe doped skutterudite CoSb3 with a nominal composition of FexCo1-xSb12 (0≤x≤2.5) have been synthesized by mechanical alloying (MA) of elemental powders, followed by vacuum hot pressing. Phase transformations during mechanical alloying and vacuum hot pressing were systematically investigated using XRD. Single phase skutterudite was successfully produced by vacuum hot pressing using as-milled powders without subsequent annealing. However, second phase in the form of marcasite structure FeSb2 was found to exist in case of x≥2, suggesting the solubility limit of Fe with Co in this system. Thermoelectric properties as functions of temperature and Fe contents were evaluated for the hot pressed specimens. Fe doping up to x=1.5 with Co in FexCo4-xSb12 appeared to increase thermoelectric figure of merit (ZT) and the maximum ZT was found to be 0.78 at 525K in this study.
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12

Choi, Moon Kwan, Soon Chul Ur, Joon Chul Kwon, K. W. Cho, Il Ho Kim, Young Geun Lee et Sung Lim Ryu. « Mechanical Alloying and Thermoelectric Properties of CoSb3 Skutterudite ». Materials Science Forum 486-487 (juin 2005) : 642–45. http://dx.doi.org/10.4028/www.scientific.net/msf.486-487.642.

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In an effort to synthesize homogenized single phase d-CoSb3, this study considers the mechanical alloying (MA) of elemental Co and Sb powders using a nominal stoichiometric composition followed by hot pressing. Single phase, undoped CoSb3 skutterudites were successfully produced by vacuum hot pressing using MA powders without subsequent annealing. Phase transformations during mechanical alloying, powder annealing, and hot pressing were systematically investigated using XRD and SEM. Thermoelectric properties were measured and compared with the results of similar studies. Temperature dependences were also evaluated, and their correlations to phase transformation were examined.
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13

Augusty, Anniza Cornelia, Ratthapol Rangkupan et Chalida Klaysom. « Evaluating Post-Treatment Effects on Electrospun Nanofiber as a Support for Polyamide Thin-Film Formation ». Polymers 16, no 5 (5 mars 2024) : 713. http://dx.doi.org/10.3390/polym16050713.

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Poly(acrylonitrile-co-methyl acrylate) (PAN-co-MA) electrospun nanofiber (ENF) was used as the support for the formation of polyamide (PA) thin films. The ENF support layer was post-treated with heat-pressed treatment followed by NaOH hydrolysis to modify its support characteristics. The influence of heat-pressed conditions and NaOH hydrolysis on the support morphology and porosity, thin-film formation, surface chemistry, and membrane performances were investigated. This study revealed that applying heat-pressing followed by hydrolysis significantly enhances the physicochemical properties of the support material and aids in forming a uniform polyamide (PA) thin selective layer. Heat-pressing effectively densifies the support surface and reduces pore size, which is crucial for the even formation of the PA-selective layer. Additionally, the hydrolysis of the support increases its hydrophilicity and decreases pore size, leading to higher sodium chloride (NaCl) rejection rates and improved water permeance. When compared with membranes that underwent only heat-pressing, those treated with both heat-pressing and hydrolysis exhibited superior separation performance, with NaCl rejection rates rising from 83% to 98% while maintaining water permeance. Moreover, water permeance was further increased by 29% through n-hexane-rinsing post-interfacial polymerization. Thus, this simple yet effective combination of heat-pressing and hydrolysis presents a promising approach for developing high-performance thin-film nanocomposite (TFNC) membranes.
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14

Koval'chenko, Mikhail S., et Anatolii V. Laptev. « Dynamics of WC – Co Hard Alloy Compaction with Hot Pulsed Pressing ». Powder Metallurgy and Metal Ceramics 43, no 3/4 (mars 2004) : 117–26. http://dx.doi.org/10.1023/b:pmmc.0000035698.34943.c6.

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15

Watanabe, Akio, Hajime Haneda, Yusuke Moriyoshi, Shin-Ichi Shirasaki et Hiroshi Yamamura. « Preparation of Zn2TiO4 by co-precipitation method and hot-isostatic pressing ». Journal of Materials Science 24, no 7 (juillet 1989) : 2281–84. http://dx.doi.org/10.1007/bf01174484.

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16

Jo, A.-Ra, Ji-Seob An, Sun-Hyung Kim, Myeong-Sik Jeong, Young-Hoon Moon et Sun-Kwang Hwang. « Novel Tensile Test Jig and Mechanical Properties of WC-Co Synthesized by SHIP and HIP Process ». Metals 11, no 6 (28 mai 2021) : 884. http://dx.doi.org/10.3390/met11060884.

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Tungsten carbide-cobalt (WC-Co) alloys have various mechanical properties according to their Co content and manufacturing method. High-strength materials such as WC-Co alloys are usually manufactured using various sintering methods. In this study, WC-Co was compared according to the Co content and manufacturing method using the sinter-hot isostatic pressing process. Furthermore, an additional test was performed to investigate the effect of post-hot isostatic pressing (HIP) treatment on the mechanical properties. To compare tensile strength, threaded end and shoulder end specimens are generally applied in axial tensile testing with hard metals. However, it is extremely difficult to shape WC-Co by machining. A tensile testing jig for a shoulder end specimen is, therefore, proposed. Tensile tests were conducted using the proposed jig, and microstructure, hardness, and impact tests were carried out to compare the mechanical properties. The microstructure evolution was obtained by decreasing the Co content and applying the HIP treatment, resulting in changes in Young’s modulus and strength. The results indicated that the proposed jig of the axial tensile test could be applied to the extremely hard WC-Co, and the mechanical properties of WC-Co could be modified by the Co content and HIP treatment control.
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17

Özcan, M. M., A. Rosa, M. A. Dessi, B. Marongıu, A. Pıras et F. AL Juhaimi. « Quality of wheat germ oil obtained by cold pressing and supercritical carbon dioxide extraction ». Czech Journal of Food Sciences 31, No. 3 (22 mai 2013) : 236–40. http://dx.doi.org/10.17221/172/2012-cjfs.

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Laboratory-prepared wheat germ oil was obtained by cold pressing and supercritical CO<sub>2</sub> extraction. The main objective was to compare the quality of both oil samples obtained, with emphasis on their fatty acids compositions and tocopherol contents. The percentages of palmitic, oleic, linoleic, and linolenic acids determined in the cold-pressed oil were 15.89, 15.48, 54.88, and 7.34% of total fatty acids, respectively, and those in the oil extracted by supercritical CO<sub>2</sub> were 16.50, 15.05, 54.79, and 7.29% of total fatty acids, respectively. The average proportions of saturated, mono- and polyunsaturated fatty acids calculated for wheat germ oil obtained by cold pressing accounted for 17.15, 17.63, and 62.22% of total fatty acids, respectively, and those calculated for wheat germ oil extracted by supercritical CO<sub>2</sub> were very similar, accounting for 18.14, 17.58, and 62.08% of total fatty acids, respectively. As expected, the fatty acid profiles determined in both oils studied were observed to be almost identical. In contrast, the level of &alpha;-tocopherol in the oil extracted by supercritical CO<sub>2</sub> was found to be considerably higher (1.27 mg/g) than that in the oil obtained by the cold pressing procedure (0.79 mg/g). &nbsp;
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Chung, S. H., H. Park, K. D. Jeon, K. T. Kim et S. M. Hwang. « An Optimal Container Design for Metal Powder Under Hot Isostatic Pressing ». Journal of Engineering Materials and Technology 123, no 2 (15 janvier 2001) : 234–39. http://dx.doi.org/10.1115/1.1354992.

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Near-net-shape forming of 316L stainless-steel powder was investigated under hot isostatic pressing. To simulate densification and deformation of a powder compact in a container during hot isostatic pressing, the constitutive model of Abouaf and co-workers was implemented into a finite element analysis. An optimal design technique based on the evaluation schemes of the design sensitivity was used to acquire the desired final shape of a powder compact. Experimental data of 316L stainless steel powder showed that the optimally designed container allowed near-net-shape forming of the desired powder compact during hot isostatic pressing.
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19

Hou, Jie, Lei Bi, Jing Qian, Zhiwen Zhu, Junyu Zhang et Wei Liu. « High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating ». Journal of Materials Chemistry A 3, no 19 (2015) : 10219–24. http://dx.doi.org/10.1039/c4ta06864e.

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20

Somunkiran, İlyas, et Ahmet Balin. « Effect of pressing temperature on the wear resistance of a Co-based Cr-Mo powder alloy produced by hot pressing ». Materials Testing 58, no 1 (5 janvier 2016) : 63–68. http://dx.doi.org/10.3139/120.110822.

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21

He, Qiu Shuang, Hai Yan Chen, Kun Li et Li Hua Dong. « Effect of Co Content on the Densification, Microstructure and Mechanical Properties of cBN-WC/Co Composites ». Key Engineering Materials 655 (juillet 2015) : 41–44. http://dx.doi.org/10.4028/www.scientific.net/kem.655.41.

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Hot pressing sintering process for cemented carbide preparation was investigated with cBN-WC/Co composite powders with different Co content from 4wt% to 10wt% at temperatures between 1300°C and 1400°C. The results showed that the Co content had remarkable influence on the densification and mechanical properties of cBN-WC/Co composites. Near-full densification can be obtained when cBN-WC/8wt%Co powders were sintered at temperatures at 1350°C, and pressures at 20MPa, combining an excellent Vickers hardness of 17.57GPa with an acceptable flexure strength of 601.58MPa.
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Busurina, M. L., A. V. Karpov, V. A. Shcherbakov, A. N. Gryadunov, N. V. Sachkova et A. E. Sychev. « Electrophysical Properties of 2 Co–Ti–Al Alloy Produced by SHS Pressing ». Inorganic Materials : Applied Research 11, no 5 (septembre 2020) : 1060–64. http://dx.doi.org/10.1134/s207511332005007x.

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23

Wang, Bo, Jie Feng et Changyou Gao. « Physical-co-Chemical Multicomponent Micropatterns on Polymer Surfaces by Thermal Pressing Method ». Chemistry of Materials 16, no 24 (novembre 2004) : 4859–63. http://dx.doi.org/10.1021/cm049156e.

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24

Zhang, Jingshi, Ruidong Xu, Bohao Yu, Yunlong He, Yiyang Li et Ziyang Qin. « Study on the properties of Pb–Co3O4–PbO2 composite inert anodes prepared by vacuum hot pressing technique ». RSC Adv. 7, no 78 (2017) : 49166–76. http://dx.doi.org/10.1039/c7ra07898f.

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25

Oliveira, Gonçalo, Ana Senos, Cristina Fernandes, Daniel Figueiredo et Teresa Vieira. « Material Extrusion to Manufacture Carbide-Based Advanced Cutting Tools ». Materials 16, no 21 (27 octobre 2023) : 6902. http://dx.doi.org/10.3390/ma16216902.

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Material extrusion (MEX) allows for the production of advanced cutting tools with new internal cooling systems, which are suitable for new machining equipment. To produce cutting tools via this process, hardmetal and cermet feedstock must be prepared for the extrusion of 3D printing filaments. After shaping the 3D object (green), debinding and sintering must be performed to achieve densification. Defects and microstructural heterogeneities were studied according to the powder material. The present study shows that, although MEX is a viable solution for hardmetals, it needs to produce homogeneous filaments for cermets. The WC-Co bulk microstructures versus hardness were similar to the ones that were measured with pressing and sintering. While cermet (Ti(CN)/WC-Ni/Co) microstructures were heterogeneous, their hardness, when compared with that from the pressing and sintering manufacturing process, decreased significantly.
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Imak, Anil, Musa Kilic et Ihsan Kirik. « Production of Ni-Co-bronze composites with different tic composition by hot pressing ». Science of Sintering, no 00 (2023) : 7. http://dx.doi.org/10.2298/sos220404007i.

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Improving microstructural, mechanical, and thermal properties of Ni-Co-Bronze composites is crucial for various applications. In this study, five Ni-Co-Bronze (CuSn) + XTiC (0, 3, 7, 10, and 15 wt.%) composites were produced by using the hot pressing method. The effect of TiC reinforcement rate on each of their microstructure, wear, hardness, and thermal properties was investigated. Within the scope of microstructure analysis, the scanning electron microscope (SEM), electron dispersive spectrometer (EDS), and XRD analysis were employed. Thermal analyses were carried out for thermal differences between the samples. Furthermore, microhardness, impact, and wear tests were run to estimate mechanical behaviors of Ni-Co Bronze + XTiC composite. Experimental results indicated that TiC rate had an important effect on the microstructure, wear-resistance and microhardness of Ni-Co bronze composite. As the TiC reinforcement rate increased, the hardness of Ni-Co Bronze + XTiC composites varied between 180 HV and 450 HV. Consequently, microstructure analysis revealed that there was a serious interaction between reinforcement and matrix. Wear resistance increased with a TiC (7-10) wt. % rate but decreased at high TiC rates. It was clearly seen that the wear pattern was both oxidative and abrasive.
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27

Kinemuchi, Yoshiaki, H. Morimitsu, H. Ishiguro, Shoji Uchimura et Koji Watari. « Centrifugal Sintering ». Key Engineering Materials 317-318 (août 2006) : 19–22. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.19.

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Co-firing of multiple materials results in the formation of internal stress due to the difference in shrinkage behavior. This internal stress causes retardation of sintering, crack formation and/or de-lamination at the interface. To reduce internal stress in layered structures, homogeneous pressing via centrifuge has been attempted. The effect of centrifugal pressing was demonstrated by film sintering, in which crack suppression and void removal by the present process were revealed. Owing to the homogeneous microstructure, the thermal stability of the film was significantly improved.
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28

Grigoriev, O. M., V. B. Vinokurov, L. I. Klimenko et N. D. Bega. « ZrB2 ceramics with MoSi2, SiC and B4C additives : compaction kinetics, phase formation and creep resistance ». Uspihi materialoznavstva 2023, no 7 (1 décembre 2023) : 113–26. http://dx.doi.org/10.15407/materials2023.07.012.

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A study was carried out of the processes of compaction, structure formation and mechanical properties of ceramics based on zirconium boride with sintering-activating additives of boron, silicon and chromium carbides, as well as molybdenum silicide, obtained under hot pressing conditions in a CO atmosphere. In ZrB2—18% (vol.) B4C ceramics, the use of the B4C additive reduces the optimal hot pressing temperature to 1940 °C and accelerates the compaction process of the ceramics. The influence of the sample preparation background on high-temperature creep has been established, as a result of which either plastic flow of the material occurs over a wide temperature range, or a high temperature threshold for yield and brittle fracture. In ZrB2—SiC ceramics, during high-temperature plastic deformation both during sintering and in creep tests, a bidisperse structure with a submicrograined component is formed, which is responsible for high creep rates. In ZrB2—B4C ceramics there is no submicrograin component, which provides high creep resistance up to 2000 °C. The phase composition of ZrB2—MoSi2 ceramics changes dramatically during hot pressing; it is represented by a composition of a ZrB2 solid solution with the second phases of SiC and B4C, and in terms of creep resistance it occupies an intermediate position between two other ceramics. Keywords: ultra-high temperature ceramics, zirconium diboride, silicon, boron and chromium carbides, hot pressing in a CO atmosphere, compaction kinetics, structure, creep resistance.
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Hütter, Miriam, Gregor Sailer, Benedikt Hülsemann, Joachim Müller et Jens Poetsch. « Impact of Thermo-Mechanical Pretreatment of Sargassum muticum on Anaerobic Co-Digestion with Wheat Straw ». Fermentation 9, no 9 (8 septembre 2023) : 820. http://dx.doi.org/10.3390/fermentation9090820.

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Sargassum muticum (SM) is an invasive macroalgal species seasonally occurring in large quantities. While generally suitable for anaerobic digestion, recent studies resulted in low specific methane yields (SMYs), presumably due to salt, polyphenol, and high fiber contents of this marine biomass. In this study, the specific biogas yield (SBY) and SMY of SM alone as well as in co-digestion with wheat straw (WS) were investigated in batch tests at process temperatures of 44 ± 1.4 °C with a retention time of approx. 40 d. The pretreatment variants of SM were examined with regard to desalination and disintegration to potentially improve digestibility and to enhance the overall performance in anaerobic digestion. A sole mechanical treatment (pressing) and a thermo-mechanical treatment (heating and pressing) were tested. Batch assays showed that pressing increased the SMY by 15.1% whereas heating and pressing decreased the SMY by 15.7% compared to the untreated variant (87.64 ± 8.72 mL/gVS). Both anaerobic digestion experiments generally showed that co-digestion with WS can be recommended for SM, but the observed SBY and SMY were still similar to those of other studies in which SM was not pretreated. The mechanical pretreatment of SM, however, offers the potential to enhance the SMY in the anaerobic digestion of SM with WS, but further research is necessary to identify the optimum upgrading approaches since the overall SMY of SM is relatively low compared to other substrates that are commonly used in anaerobic digestion. In addition to anaerobic digestion, SM as an already available biomass could also be of interest for further utilization approaches such as fiber production.
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Bondarenko, N. A., V. A. Mechnik, R. A. Hasanov et V. N. Kolodnitsky. « Microstructure of WC–Co–VN carbide catrix for drilling tools diamond-containing materials ». SOCAR Proceedings, no 3 (30 juin 2020) : 21–30. http://dx.doi.org/10.5510/ogp20200300441.

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The results of studies aimed at improving the structure and performance characteristics of carbide matrices WC-Co samples, formed by cold pressing and thereafter hot pressing, for drilling tools diamond-containing materials. It is shown that the introduction of vanadium nitride in an amount of 3% into the composition of the starting materials 94WC-6Co provides an increase in the hardness of the sample from 22.8 to 34.2 GPa, the strength limit in compression from 4800 to 5340 MPa and bending from 2200 to 2280 MPa, as well as reduction of wear intensity from 1710×10-6 to 5200×10-6 g/m. The revealed effect of the formation of a fine-grained structure of a carbide matrix WC-Co-VN with increased mechanical and operational characteristics indicates the need for their use in the development of effective tools for drilling oil and gas wells.
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Gao, Boyang, Zhongjun Liu, Shuai Ji et Qingbo Ao. « Fabrication of a YSZ electrolyte layer via co-pressing/co-sintering for tubular NiO-YSZ anode-supported SOFCs ». Materials Letters 323 (septembre 2022) : 132547. http://dx.doi.org/10.1016/j.matlet.2022.132547.

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Fujita, Takeshi, Shunichi Nishimura, Takayoshi Fujinami, Kenji Kaneko, Zenji Horita et David J. Smith. « Application of equal-channel angular pressing to Cu–Co alloy with ferromagnetic precipitates ». Materials Science and Engineering : A 417, no 1-2 (février 2006) : 149–57. http://dx.doi.org/10.1016/j.msea.2005.11.008.

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Tai, Weon-Pil, et Tadahiko Watanabe. « Fabrication and Mechanical Properties of Al2O3-WC-Co Composites by Vacuum Hot Pressing ». Journal of the American Ceramic Society 81, no 6 (21 janvier 2005) : 1673–76. http://dx.doi.org/10.1111/j.1151-2916.1998.tb02531.x.

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Li, Xibao, Junming Luo, Zhijun Feng, Shengfeng Zhou et Juntong Huang. « In-situ hot pressing sintering behaviors of Y2O3-La2O3 co-doped AlON ceramic ». Ceramics International 42, no 15 (novembre 2016) : 17382–86. http://dx.doi.org/10.1016/j.ceramint.2016.08.037.

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Lin, Wensong, Ningxiang Fang, Chenxin Ouyang et Wei Wang. « Zn1−x Co x O diluted magnetic semiconductor bulk prepared by hot pressing ». Journal of Wuhan University of Technology-Mater. Sci. Ed. 25, no 3 (juin 2010) : 527–29. http://dx.doi.org/10.1007/s11595-010-0036-9.

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Ragani, J., A. Volland, S. Gravier, J. J. Blandin et M. Suéry. « Metallic glass/light alloy (MEGA) multimaterials elaborated by co-pressing at high temperature ». Journal of Alloys and Compounds 495, no 2 (avril 2010) : 323–26. http://dx.doi.org/10.1016/j.jallcom.2009.10.101.

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Barbosa, A. P., L. J. Oliveira, Guerold Sergueevitch Bobrovinitchii, R. S. Guimarães, S. Crespo et Marcello Filgueira. « Processing and Mechanical Properties of PM Processed Fe-Cu-Co Alloys ». Materials Science Forum 591-593 (août 2008) : 247–51. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.247.

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In this work, a study to process and characterize Fe-Cu alloys with reduced Co content is shown. The Fe-Cu-Co alloys were processed by elemental blending of powders of the system Fe- 15%wtCu with various amounts of Co, pressing at 350MPa, and sintering at 1150°C/25min./10-2 mbar. The sintered microstructure was observed. It was conducted hardness and wear tests, aiming to define the ideal Cu addition for future use in impregnated diamond tools. It was observed that higher Co contents results in improved hardness and wear resistance in the studied Fe-Cu alloys.
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Muhammad, Ishaka, et George Manos. « Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing ». Catalysts 11, no 7 (30 juin 2021) : 805. http://dx.doi.org/10.3390/catal11070805.

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Biomass pyrolysis is a promising technology for fuel and chemical production from an abundant renewable source. It takes place usually in two stages; non-catalytic pyrolysis with further catalytic upgrading of the formed pyrolysis oil. The direct catalytic pyrolysis of biomass reduces the pyrolysis temperature, increase the yield to target products and improves their quality. However, in such one-stage process the contact between biomass and solid catalyst particles is poor leading to an excessively high degree of pure thermal pyrolysis reactions. The aim of this study was to enhance the catalyst-biomass contact via co-pressing of biomass and catalyst particles as a pre-treatment method. Catalytic pyrolysis of biomass components with HY and USY zeolites was studied using thermogravimetric analysis (TGA), as well as experiments in a pyrolysis reactor. The liquid and coke yields were characterized using gas chromatography, and TGA respectively. The TGA results showed that the degradation of the co-pressed cellulose occurred at lower temperatures compared to the pure thermal degradation, as well as catalytic degradation of non-pretreated cellulose. All biomass components produced better results using the co-pressing method, where the liquid yields increased while coke/char yields decreased. Bio-oil from catalytic pyrolysis of cellulose with HY catalyst mainly produced heavier fractions, while in the presence of USY catalyst medium fraction was mainly produced within the gasoline range. For hemicellulose catalytic pyrolysis, the catalysts had similar effects in enhancing the lighter fraction, but specifically, HY showed higher selectivity to middle fraction while USY has produced higher percentage of lighter fraction. Using with both catalysts, co-pressing had the best effect of eliminating the heavier fraction and improving the gasoline range fraction. Spent catalyst from co-pressed sample had lower concentrations of coke/char components due to the shorter residence times of volatiles, which suppresses the occurrence of secondary reactions leading to coke/char formations.
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Phan Tai, Huan, et Gerd Brunner. « Extraction of Oil and Minor Compounds from Oil Palm Fruit with Supercritical Carbon Dioxide ». Processes 7, no 2 (18 février 2019) : 107. http://dx.doi.org/10.3390/pr7020107.

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A significant quantity of tocochromanols and carotenoids remains in the residual from palm oil production by traditional screw pressing. Supercritical carbon dioxide extraction was used as alternative method with the purpose to recover better these valuable minor compounds. Total oil yield and co-extracted water were investigated in the course of extraction. Tocochromanols and carotenoids were evaluated, not only in the extraction oil, but also in the oil of residual fibre. Modelling of extraction process was also performed for a further up-scaling. The results showed that oil yield up to 90% could be observed within 120 min. Supercritical carbon dioxide (SCCO2) could extract tocochromanols and carotenoids with concentration in the same range of normal commercial processing palm oil, while co-extracted water remained rather low at a level of 2–4%. Moreover, recovery efficiencies of these minor compounds were much higher in case of extraction processed with supercritical carbon dioxide than those with screw pressing method.
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Harkiah, Sasa, Nurlaela Rauf et Dahlang Tahir. « Review of ceramic materials and recent development of preparation methods ». Gravitasi 21, no 2 (31 décembre 2022) : 49–60. http://dx.doi.org/10.22487/gravitasi.v21i2.15904.

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Ceramics globally has been developed by various materials and methods to find suitable ceramics for specific applications. This paper discusses development of several methods in ceramic preparation such as hot-pressing, sintering, co-precipitation, and solid-state method. In 2001 up to 2019, hot-pressing method was used to manufacture ceramic B4C and SiAlCO as raw material doping by (W, Ti)C. In 2002 up to 2018 sintering method by using fly ash as raw material with an additional K2CO3, Na2CO3, and Nb2O5. In 2008, co-precipitation method was used for CaCu3Ti4O12 (CCTO) as raw material until 2019, and then ZrO2-Al2O3 as a newcomer ceramic material. From 2001 up to 2017, solid-state method was used with microwave for MgTiO and 3-CaTiO with Eu and (Lu, Gd) 2O3 as a dopant. This paper provided four methods and the materials from reported references from 2000 up to now, as guidance in producing specific functional ceramics in the future.
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Xiao-Fang, ZHANG, LIU Tao, JIN Hong-Bin, YU Jing-Kun, GAO Xiang, WANG Cheng et WANG Xiang-Nan. « La0.8Sr0.2(Ga0.8Mg0.2)0.1Fe0.9O3-&delta ; Dense Diffusion Barrier Limiting Current Oxygen Sensor Prepared by Co-pressing and Co-sintering Method ». Journal of Inorganic Materials 32, no 10 (2017) : 1089. http://dx.doi.org/10.15541/jim20160693.

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Meng, Xiao Wei. « Research on Performance of New Pressing Binder in Hardmetal ». Advanced Materials Research 148-149 (octobre 2010) : 1730–36. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1730.

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The advantages and disadvantages between the pressing binder of hardmetal in existence are analyzed. A new type of binder named QSD is introduced and a series of properties are studied. The experiments show that QSD has been tested to dissolve in alcohol. The materials of hardmetal are milled in alcohol mixed with QSD, achieving a molecule dispersing slurry. The slurry adapts to spray drying with low viscidity. The mixture of the hardmetal prepared by QSD is fine, and soft with good flowability. They are capable of pressing complex form of products that couldn’t be formed with PEG, paraffin wax binder by comparing the experiments. The compacting force has reduced 20% compared to PEG.. The pressing products are effectively less vices of delamination and crack due to the low brittleness and high weight of compact. The products made by QSD fit continuous sintering and there are few remainder carbon in the sintered products. Microstructural observation reveals that the Co particle distributes homogeneously in the WC particle with the pressing binder QSD. So QSD is one kind of considerably ideal cemented carbide binder that combines the advantages of PEG, SBS.
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43

Borowiecka-Jamrozek, J. « Detonation-Sprayed Wc-12%Co and Wc-17%Co Diamond-Impregnated Segments/ Natryskiwanie Detonacyjne Powłok Wc-12%Co I Wc-17%Co Na Spieki Metaliczno-Diamentowe ». Archives of Metallurgy and Materials 59, no 4 (1 décembre 2014) : 1327–30. http://dx.doi.org/10.2478/amm-2014-0226.

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Abstract This paper presents results of investigations of WC-12%Co and WC-17%Co coatings detonation sprayed on a sintered cobalt substrate. The main objective of the present work was to establish a new production route of sandwich type diamond-impregnated segments for circular sawing of stone and other construction materials. Unalloyed cobalt was chosen as the substrate material. Prior to coating the specimens were made by means of hot pressing of Extrafine cobalt powder in a graphite mould. The segments were then coated with WC-Co. The effects of the coating process on the thickness, microhardness, microstructure and wear resistance of the deposits were investigated. The properties of the coatings were established by performing the following tests: a microstructure analysis, a point analysis of chemical composition and a linear analysis, a phase composition, a microhardness tests and abrasion resistance.
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Qu, Xiu Rong, et De Chang Jia. « Preparation and Thermoelectric Properties of Al2O3-Doped ZnO Ceramics ». Key Engineering Materials 368-372 (février 2008) : 562–64. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.562.

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Al2O3-doped ZnO ceramics were prepared via chemical co-precipitation processing. Zinc acetate, ammonia and Al2O3 powders are used as starting materials. Scanning electron microscopy (SEM) observations reveal that the doping of Al2O3 has an obvious influence on the microstructure of ZnO ceramics. Ordinary cold pressing and cold isostatic pressing (CIP) were used to prepare green compacts. The thermal conductivity and electrical conductivity of the Al2O3-doped ZnO ceramics were measured as a function of the testing temperature (0-900oC). Doping of Al2O3 is beneficial to improve thermoelectric (TE) properties of ZnO ceramics. CIP can also improve TE properties of Al2O3-doped ZnO ceramics.
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Bailey, Daniel J., Erik V. Johnstone, Martin C. Stennett, Claire L. Corkhill et Neil C. Hyatt. « An Investigation of Iodovanadinite Wasteforms for the Immobilisation of Radio-Iodine and Technetium ». Ceramics 6, no 3 (24 août 2023) : 1826–39. http://dx.doi.org/10.3390/ceramics6030111.

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99Tc and 129I are two long-lived, highly soluble and mobile fission products that pose a long-term hazard. A proposed wasteform for the disposal of radio-iodine is iodovanadinite (Pb5(VO4)3I), an apatite-structured vanadate. In this investigation, a suite of potential iodovanadinite wasteforms designed for the co-disposal of Tc and I or the sole disposal of I were synthesised via hot isostatic pressing (with Mo as a surrogate for Tc). It was found that direct synthesis from oxide and iodide precursors was possible using hot isostatic pressing (HIPing). Increasing overpressure during HIPing was found to improve the density of the final product. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses indicated that the use of AgI as the source of iodine affected the formation of the target iodovanadinite phase and produced unfavourable phase assemblages. Here, we report the direct synthesis of Pb5(VO4)3I in a single step by hot isostatic pressing.
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Peng, Qing Xi, et Lan You. « Towards Sentiment Classification with Co-Training Method ». Applied Mechanics and Materials 543-547 (mars 2014) : 2053–56. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2053.

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With development of Web2.0, user-generated-contents spread in the Internet. It provides good topics to the research. People express their opinions and sentiments on the cyberspace. The opinions and sentiments are very important and attract extensive research. However, it is impossible for the user to browse the content carefully. Hence classification and summarization of online text become a pressing issue. In this paper, we propose a Co-Training method to the sentiment classification. Posts and replies have been chosen as different views for the Co-Training. Several features have been employed. Experimental result in the datasets demonstrates the advantage of the proposed model.
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Sasaki, Keiko, Yoshikazu Hayashi, Takeshi Nakamura, Binglin Guo et Quanzhi Tian. « Stabilization of borate by hot isostatic pressing after co-precipitation with hydroxyapatite using MAP ». Chemosphere 254 (septembre 2020) : 126860. http://dx.doi.org/10.1016/j.chemosphere.2020.126860.

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Yin, Yan Sheng, Shou Gang Chen, Xue Ting Chang et Alan Kin Tak Lau. « Preparation and Mechanical Properties of Nanocobalt Coated Al2O3-TiC Composites ». Key Engineering Materials 334-335 (mars 2007) : 913–16. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.913.

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Al2O3-TiC composites were fabricated by hot-pressing Cobalt coated powders at low temperature through liquid phase sintering. Cobalt coating layers effectively hinder the growth of grain and harmful reaction between Al2O3 and TiC particles, which would improve the mechanical properties of Al2O3-TiC composites. The hardness decreases with the increase of Co content and the bending strength was enhanced to 782MPa owing to the grain refinement effect of Co phase. The fracture toughness, about 9.23 MPa.m1/2, was measured for the composites containing 3wt% Co sintered at 1550°C. SEM images of fracture surface show that the toughening effect should be attributed to the conversion of fracture mode caused by the Co phase.
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Buršík, Jiří, Petr Král, Milan Svoboda, Jiří Dvořák et Václav Sklenička. « Nanoindentation and Microstructural Study of Cu-Co Alloys after Severe Plastic Deformation ». Key Engineering Materials 592-593 (novembre 2013) : 720–23. http://dx.doi.org/10.4028/www.scientific.net/kem.592-593.720.

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In this work we studied the microstructure evolution due to equal channel angular pressing of Cu-2wt.%Co alloy after various heat treatments. Several subsequent passes were performed at room temperature. The microstructure was characterized using electron backscatter diffraction technique in a scanning electron microscope. Local mechanical properties were studied by means of nanoindentation experiments using a Hysitron PI85 picoindenter operated inside an electron microscope.
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Fujiuchi, Hidehito, et Koji Hayashi. « Hot-Pressing of Co+Ni and Fe+Co+Ni Mixed Ultrafine Powders and Grain Size and Hardness of Sintered Compacts. » Journal of the Japan Society of Powder and Powder Metallurgy 38, no 4 (1991) : 482–85. http://dx.doi.org/10.2497/jjspm.38.482.

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