Synthesis and Spark Plasma Sintering of Nanosized Refractory Carbide/Nitride Powders

2020 ◽  
Vol 850 ◽  
pp. 279-284
Author(s):  
Ilmārs Zālīte ◽  
Anita Letlena ◽  
Ints Šteins ◽  
Aija Krūmiņa ◽  
Māra Lubāne ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Carbothermal Reduction ◽  
Sol Gel ◽  
Reduction Process ◽  
Ceramic Materials ◽  
Refractory Carbide ◽  
Plasma Chemical ◽  
Refractory Compounds ◽  
Plasma Sintering ◽  
Spark Plasma

In the present study, seven refractory compounds - TiC, NbC, TaC, WC, Ti (C,N), (Ti,Nb)(C,N) and TiN - have been produced by plasma-chemical synthesis and carbothermal reduction process of a precursor prepared by sol-gel method. The phase composition, crystallite size, morphology and specific surface area of the synthesized powders are investigated by XRD, TEM, SEM and BET respectively. Spark plasma sintering (SPS) method (up to 1850 °C, heating rate of 100 °C/min and dwelling time of 5 min.) are used for investigation of compacting of these compounds. Characteristics of the obtained ceramic materials are provided.

scholarly journals Obtaining Ceramic Materials from Hydroxyapatite Using Spark-Plasma Sintering

2018 ◽  
Vol 37 (7) ◽  
pp. 613-617 ◽  
Author(s):  
Evgeny N. Bulanov ◽  
Maxim S. Boldin ◽  
Alexander V. Knyazev ◽  
Vitaliy Zh. Korokin ◽  
Alexander A. Popov
Keyword(s):  
Spark Plasma Sintering ◽  
Sol Gel ◽  
Polymorphic Transition ◽  
Ceramic Materials ◽  
Endothermic Effect ◽  
Scanning Calorimetry ◽  
Cell Parameters ◽  
Thermal Expansion Coefficients ◽  
Plasma Sintering ◽  
Spark Plasma

AbstractHydroxyapatite was synthesized via sol-gel and solid-state reaction. Both compounds were investigated using high-temperature X-ray diffraction and differential scanning calorimetry. For sol-gel hydroxyapatite, we observed a phase transition, confirmed by character of changing of unit-cell parameters, thermal expansion coefficients and endothermic effect on DTA curve. In the process of obtaining ceramics using spark-plasma sintering both compounds manifested an unexpected shrinkage rate. All effects were explained on the basis of changings in crystal structure during distortion polymorphic transition.

Some SiAlONs Prepared from Nanopowders by Spark Plasma Sintering

2009 ◽  
Vol 151 ◽  
pp. 240-244
Author(s):  
Ilmars Zalite ◽  
Natalja Zilinska ◽  
Ints Šteins ◽  
Janis Krastins
Keyword(s):  
Spark Plasma Sintering ◽  
Ceramic Materials ◽  
Holding Time ◽  
Plasma Chemical ◽  
Nanosized Powders ◽  
Fine Grained ◽  
Plasma Sintering ◽  
Dense Ceramic ◽  
Fine Grained Structure ◽  
Spark Plasma

Different compositions of α- and α-/β- SiAlON materials have been prepared from separate nanopowders and their composites: Si3N4 – AlN, Si3N4, Al2O3 and Y2O3, produced by the method of plasma-chemical synthesis. Compositions have been sintered by spark plasma sintering (SPS) method in vacuum at 1700 °C with a heating rate of 100 °C/min and holding time of 5 min. The densification behaviour of the materials at these sintering conditions depends insignificantly on the powder composition. It is possible to obtain dense ceramic materials with relatively fine-grained structure (200-400 nm) and good mechanical properties from nanosized powders at relatively low temperatures (1400-1600 °C). The holding time at applied compacting conditions is still too short to ensure the formation of α- SiAlON phase corresponding to the phase diagram. All samples consist of β- SiAlON’s of differing composition and this is the reason for relatively low hardness of samples (HV5 = 15,6-16,9 GPa).

scholarly journals Spark Plasma Sintering of Ceramics: From Modeling to Practice

Ceramics ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 476-493
Author(s):  
Michael Stuer ◽  
Paul Bowen ◽  
Zhe Zhao
Keyword(s):  
Spark Plasma Sintering ◽  
Ceramic Materials ◽  
Model Material ◽  
Operational Parameters ◽  
Key Factors ◽  
Engineering Approach ◽  
Plasma Sintering ◽  
Wide Range ◽  
Spark Plasma ◽  
Industrial Settings

Summarizing the work of nearly a decade of research on spark plasma sintering (SPS), a review is given on the specificities and key factors to be considered in SPS of ceramic materials, based on the authors’ own research. Alumina is used primarily as a model material throughout the review. Intrinsic inhomogeneities linked to SPS and operational parameters, which depend on the generation of atomistic scale defects, are discussed in detail to explain regularly observed inhomogeneities reported in literature. Adopting an engineering approach to overcome these inherent issues, a successful processing path is laid out towards the mastering of SPS in a wide range of research and industrial settings.

Spark plasma sintering of Y2O3–MgO composite nanopowder synthesized by the esterification sol–gel route

2015 ◽  
Vol 41 (2) ◽  
pp. 3312-3317 ◽  
Author(s):  
Shengquan Xu ◽  
Jiang Li ◽  
Huamin Kou ◽  
Yun Shi ◽  
Yubai Pan ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Sol Gel ◽  
Plasma Sintering ◽  
Spark Plasma
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