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Density, Microstructure, Strength and Fractography of Spark Plasma and Conventionally Sintered Mn Steels

REFERENCES [1] Hryha, E., Nyborg, L., Dudrova, E., Bengtsson, S. In: Proc. Euro PM2009 - Sintered Steels 1 – Composition. International powder metallurgy congress et exhibition. Copenhagen, 12.-14.10.2009. Vol. 1. Shrewsbury: EPMA, 2009, p. 17 [2] Taylor, GF.: US Patent No. 1,896,854, 1933 [3] Taylor, GF.: US Patent No. 1,896,853, 1933 [4] Crèmer, GD.: US Patent No. 2,355,954, 1944 [5] Lenel, VF.: JOM – the Journal of The Minerals, Metals & Materials Society (TMS), Trans. AIME, vol. 7, 1955, no. 1, p. 158 [6] Song, X., Liu, X

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Applying “Spark Plasma Sintering” Technology to Enhance the Resistance to Contact Fatigue of Sintered Steel Based on Astaloy CRL

Abstract

The article deals with the effect of porosity on the contact fatigue of sintered material type Astaloy CrL with 0.3 and 0.4% C. Sets of samples were used with densities beginning from the value of 7000 kg.m−3 to the value of almost 7859 kg.m−3 which represents almost zero porosity (compact material). It has been found out that the increase of compacting pressure applied simultaneously with temperature results in the reduction of porosity from the value of 9.10% to 0.0005% and increase in hardness from 145 to 193 HV10, depending on the carbon content. Logically there is also an increase in the fatigue life by the contact fatigue tests for the value of 50×106 cycles from the value of 900 MPa to 1150 MPa for samples with 0.3% of C and from 900 MPa to 1300 MPa for samples with 0.4% C. These investigations were also carried out in the past, but to achieve the reduction of porosity, different technonologies were used at each level such as double pressing, hot pressing, saturation, hot forging, etc. In this case, the single technology of “spark plasma sintering” making use of compacting at high temperatures is capable to continuously reduce porosity to zero.

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The Effect of Raw Components on the Densification and Properties of Nanostructured Sialon Materials / Izejas materiālu ietekme uz nanostrukturētu sialona materiālu saķepšanu un īpašībām

6. Zalite, I., Zhilinska, N., Krumina, A. Sintering of plasma-chemically synthesized SiAlON nanopowder. In: Nanomaterials and Nanotechnologies (Zalite, I. and Krastins, J., eds.). Institute of Inorganic Chemistry of the Riga Technical University, Riga, 2005, pp. 98-103. 7. Žilinska, N., Zālīte, I., Krastiņš, J. Investigation of Production of Finegrained SiAlON Ceramics from Nanopowders, Materials Science (Medžigotyra), vol. 18, No. 3, 2012, pp. 275-279. http://dx.doi.org/10.5755/j01.ms.18.3.2439 8. Zalite, I., Zilinska, N., Steins

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Research on Technical Ceramics and their Industrial Application: Preparation Techniques and Properties of Transparent AlON Ceramics

ceramics . Ceramics International, 43/11. (2017) 8195–8201. https://doi.org/10.1016/j.ceramint.2017.03.146 [10] Sahin F. C., Kanbur H. E., Apak B.: Preparation of AlON ceramics via reactive spark plasma sintering . Journal of the European Ceramic Society, 32/4. (2012) 925–929. https://doi.org/10.1016/j.jeurcer-amsoc.2011.10.043 [11] Li X., Huang J., Luo J.: Progress and Challenges in the Synthesis of AlON Ceramics by Spark Plasma Sintering . Transactions of the Indian Ceramic Society, 76/1. (2017). 14–20. https://doi.org/10.1080/0371750X.2016

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Cutting Capacity and Wear Resistance of Cr2O3-AlN Nanocomposite Ceramic Obtained by Field Activated Sintering Technique (Fast)

two types of Al2O3/TiC ceramic cutting tool material at room and elevated temperatures. Ceramics International, 43 (2017) 13869-13874. 10. Basu B., Lee J.H., Kim D.Y.: Development of WC-ZrO 2 nanocomposites by spark plasma sintering. J. Am. Ceram. Soc., 87(2) (2004) 317–319. 11. Malek O., Lauwers B., Perez Y., Baets P., Vleugels J.: Processing of ultrafine ZrO 2 toughened WC composites. J. Eur. Ceram. Soc., 29(16) (2009) 3371–3378. 12. Pedzich Z., Haberko K., Piekarczyk J., Faryna M., Litynska L.: Zirconia matrix-tungsten carbide particulate

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Optimal Features of Porosity of Ti Alloys Considering their Bioactivity and Mechanical Properties

-filled pores. J. Mater. Res., 16 (2001) 1508-1539. Li J. P., Li S. H., Van Blitterswijk C. A., De Groot K.: A novel porous Ti 6 Al 4 V: characterization and cell attachment. J. Biomed. Mater. Res., 73A (2005), 223-233. Miyao R., Omori M., Watari F., Yokoyama A., Matsumo H., Hirai T., Kawasaki T.: Fabrication of functionally graded implants by spark plasma sintering and their properties. J. Japan Soc. Powder Metall., 47 (2000), 1239-1242. Groza J. R., Zavaliangos A.: Sintering activation by external

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Synthesis, sintering, specific heat and magnetism of Eu3S4 by low-temperature CS2-gas sulfurization of Eu2O3 nanospheres

Abstract

Single-phase Eu3S4 was obtained via CS2 gas sulfurization of Eu2O3 nanospheres at 773 K for longer than 0.5 h. The primary particle size of Eu3S4 became larger than that of Eu2O3 during the sulfurization process. Pure synthetic Eu3S4 powders were unstable and transformed to EuS at 873 K under vacuum. Eu3S4 compacts were sintered in temperature range of 773 K to 1173 K and they transformed to EuS at 1473 K during spark plasma sintering. Specific heat of sintered Eu3S4 did not show an anomalous behavior in the range of 2 K to 50 K. The magnetic susceptibility of polycrystalline Eu3S4 followed a Curie-Weiss law from 2 K to 300 K. Magnetization of polycrystalline Eu3S4 was larger than that of single crystal Eu3S4 when the magnetic field was less than 3.5 kOe.

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Pecularities of Gas Analysis in Al and Mg Powders

Mezbahul-Islam, Ahmad Omar Mostafa, Mamoun Medraj Hindawi: Journal of Materials, vol. 2014, Article ID 704283 http://dx.doi.org/10.1155/2014/704283 [6] Pieczonka, T., Schubert, T., Baunack, S.: Sintering Behaviour of Aluminium in Different Atmospheres [7] Chua, AS., Brochu, M., Bishop, DP.: Spark plasma sintering of prealloyed aluminium powders [8] Czerwinski, F.: JOM, May, 2004 [9] Krasovskii, PV.: Inorganic materials, vol. 50, 2014, p.1480, DOI: 10.1134/S0020168514150059 [10] Colombo, A.: Analytica Chimica Acta, vol. 81, 1976, p. 397

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ZnFe2O4 Containing Nanoparticles: Synthesis and Magnetic Properties

.11.167 [23] N. Millot, S. Le Gallet, D. Aymes, F. Bernard, and Y. Grin, “Spark plasma sintering of cobalt ferrite nanopowders prepared by coprecipitation and hydrothermal synthesis,” Journal of the European Ceramic Society , vol. 27, no. 2–3, pp. 921–926, Jan. 2007. https://doi.org/10.1016/j.jeurceramsoc.2006.04.141 [24] B. Xue, R. Liu, Z.-D. Xu, and Y.-F. Zheng, “Microwave Fabrication and Magnetic Property of Hierarchical Spherical α-Fe 2 O 3 Nanostructures,” Chemistry Letters , vol. 37, no. 10, pp. 1058–1059, Oct. 2008. https://doi.org/10.1246/cl.2008

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