Interplay between decarburization, oxide segregation, and densification during sintering of nanocrystalline TaC and NbC

Bokov, Arseniy; Shelyug, Anna; Kurlov, A. S.

doi:10.1016/j.jeurceramsoc.2021.05.007

Cited by 18 publications

(4 citation statements)

References 60 publications

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“…In our opinion, one of the reasons may be the presence of the increased concentration of adsorbed oxygen and/or silicon oxide on the surface of β-SiC n nanoparticles. The oxygen presence on the surface of carbide nanoparticles can have a significant effect on the ESPS [17,21] kinetics and mechanical properties [21,22] of fine-grain ceramics. It was noted in paper [11] that at temperatures below 1600 • C the β-SiC phase can react with the SiO 2 surface layer to form SiO and CO.…”

Section: Summary and Analysis Of Resultsmentioning

confidence: 99%

Spark Plasma Sintering of Al-=SUB=-2-=/SUB=-O_3-SiC ceramics. Study of the Microstructure and Properties

et al. 2022

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The features of spark plasma sintering of submicron Al2O3 powders with different contents (0, 0.5, 1.5, 5 vol.%) of β-SiC nanoparticles have been studied. The microstructure and hardness of Al2O3 + 5 vol.% SiC ceramics obtained by sintering Al2O3 powders with β-SiC particles of various types (nanoparticles, submicron particles, fibers) have been studied. Sintering was carried out at heating rates (Vh) from 10 to 700oC/min. The sintering process of Al2O3 + SiC ceramics with low heating rates (V_h=10-50oC/min) has a complex three-stage character, with a flat area in the temperature range of 1200-1300oC. At high heating rates (V_h>250oC/min), the usual three-stage character of sintering is observed. The analysis of temperature dependences of compaction was carried out using the Young-Cutler model; It was found that the kinetics of powder sintering is limited by the intensity of grain boundary diffusion. It is shown that the dependence of the hardness of Al2O3 + SiC ceramics on Vh has a nonmonotonic character, with a maximum. In the case of pure alumina, an increase in Vh leads to a monotonic decrease in hardness Keywords: Alumina, silicon carbide, density, diffusion, hardness.

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Section: Summary and Analysis Of Resultsmentioning

confidence: 99%

Spark Plasma Sintering of Al-=SUB=-2-=/SUB=-O_3-SiC ceramics. Study of the Microstructure and Properties

et al. 2022

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“…The microhardness of the samples at 1000 °C−40 MPa-90 min and 1000 °C−40 MPa-120 min are 2068.4 HV 0.1 and 2096.4 HV 0.1 , respectively, whereas the test results of multiple groups of different holding times are close, indicating that the NbC/Fe composite layer has a uniform structure and its hardness range is comparable to that of pure niobium carbide. (2040 HV ∼ 2550 HV) [27]. Figure 5 displays the hardness comparison of unreacted niobium plate, NbC/Fe-based composite layer and HT300 matrix.…”

Section: Microhardnessmentioning

confidence: 99%

Investigating the binding properties of NbC/Fe-based composite layer and HT300 through experiments and simulations

Zhao

Shan

Wang

et al. 2023

Mater. Res. Express

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In this work, the hot-pressing diffusion method was used for the fabrication of a novel composite structure. More specifically, by keeping the temperature constant at 1000℃ and applying a pressure value of 40 MPa for 60 min, 90 min and 120 min, respectively, the NbC/Fe composite layer on the surface of HT300 was formed. The microstructure, element distribution, microhardness, bonding property and scratch deformation characteristics of NbC/Fe composite layer were studied, and the fracture mode was studied by simulation and tensile test at the micro level. The results show that the main components of the NbC/Fe composite layer prepared in the experiment are α- Fe and NbC, the composition of the composite layer is pure. The thickness of NbC/Fe composite layer prepared with 60 min, 90 min and 120 min holding time is 5 μm、15 μm and 23 μm. The hardness of the composite layer can reach 2096.4HV0.1; The bonding property between the NbC/Fe composite layer and the matrix is the best when the heat preservation is 120 min. Because the tensile fracture is brittle and the fracture location is in the NbC/Fe composite layer, the bonding strength between the composite layer and the matrix is greater than 297MPa, which has excellent bonding properties. In the scratch test, the longer the holding time is, the stronger the bonding ability between the reinforcing layer and the matrix is, 41.2N (90min) and 75.75N (120min) respectively. The fracture mechanism in the NbC/Fe composite layer was simulated by abaqus. The fracture of the composite layer was caused by the propagation of microcracks caused by the stress concentration at the sharp corner of square NbC particles in the layer.

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“…По нашему мнению, одной из причин может быть наличие повышенной концентрации адсорбированного кислорода и/или оксида кремния на поверхности наночастиц β-SiC n . Присутствие кислорода на поверхности наночастиц карбидов может оказывать существенное влияние на кинетику ЭИПС [17,21] и механические свойства [21,22] мелкозернистых керамик. В работе [11] отмечено, что при температуре ниже 1600 Аморфная фаза содержит избыточный свободный объем [24], и при ее кристаллизации могут возникать дефекты вакансионного и дислокационного типа [25].…”

Section: обобщение и анализ результатовunclassified

Высокоскоростное электроимпульсное плазменное спекание мелкозернистых керамик Al-=SUB=-2-=/SUB=-O_3-SiC. Исследование микроструктуры и механических свойств

Болдин¹,

Попов²,

Мурашов³

et al. 2022

Журнал Технической Физики

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The features of spark plasma sintering of submicron Al2O3 powders with different contents (0, 0.5, 1.5, 5 vol.%) of -SiC nanoparticles have been studied. The microstructure and hardness of Al2O3 + 5 vol.% SiC ceramics obtained by sintering Al2O3 powders with -SiC particles of various types (nanoparticles, submicron particles, fibers) have been studied. Sintering was carried out at heating rates (Vh) from 10 to 700 °C/min. The sintering process of Al2O3 + SiC ceramics with low heating rates (Vh = 10–50 °C/min) has a complex three-stage character, with a flat area in the temperature range of 1200–1300 °C. At high heating rates (Vh > 250 °C /min), the usual three-stage character of sintering is observed. The analysis of temperature dependences of compaction was carried out using the Young-Cutler model; It was found that the kinetics of powder sintering is limited by the intensity of grain boundary diffusion. It is shown that the dependence of the hardness of Al2O3 + SiC ceramics on Vh has a nonmonotonic character, with a maximum. In the case of pure alumina, an increase in Vh leads to a monotonic decrease in hardness.

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Interplay between decarburization, oxide segregation, and densification during sintering of nanocrystalline TaC and NbC

Cited by 18 publications

References 60 publications

Spark Plasma Sintering of Al-=SUB=-2-=/SUB=-O_3-SiC ceramics. Study of the Microstructure and Properties

Spark Plasma Sintering of Al-=SUB=-2-=/SUB=-O_3-SiC ceramics. Study of the Microstructure and Properties

Investigating the binding properties of NbC/Fe-based composite layer and HT300 through experiments and simulations

Высокоскоростное электроимпульсное плазменное спекание мелкозернистых керамик Al-=SUB=-2-=/SUB=-O_3-SiC. Исследование микроструктуры и механических свойств

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