FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W47396089> ?p ?o ?g. }

• W47396089 abstract "The remarkable discovery of flash sintering came across during the early work of Cologna et al. and emerged as an attractive technique in the field of ceramic processing. In this technique the applied electric field initiates the “flash” event, while the densification is controlled by the current density set. Sintering occurs in less than 5 s at a threshold temperature for a given applied field. The objective of this thesis is to analyse the phenomena of flash sintering with different ceramic oxides; such as alumina-zirconia composite, hydroxyapatite and doped-alumina. The technique involved the application of constant electric field to a dog bone shaped specimen by means of two platinum electrodes while heating. Experiments were performed either in constant heating rate or in Isothermal condition. For the two-phase 3YSZ-alumina ceramic flash sintering was studied by constant heating rate (CHR) and isothermal sintering experiments. In CHR experiment the 50 vol% 3YSZ-alumina composite was shown to flash sinter at a furnace temperature of 1060°C under an electrical field of 150 V cm−1. Conversely, undoped single-phase alumina remains immune to sintering under fields up to 1000 V cm−1, although single-phase 3YSZ flash sinters at 750°C (furnace temperature). The mechanisms of field assisted sintering are divided into two regimes. At low fields the sintering rate increases gradually (FAST), while at high fields sintering occurs abruptly (FLASH). Interestingly, alumina/zirconia composites show a hybrid behaviour such that early sintering occurs in FAST mode, which is then followed by flash-sintering. The specimens held in the flashed state, after they had sintered to nearly full density, show much higher rate of grain growth than in conventional experiments. These results are in contrast to earlier work where the rate of grain growth had been shown to be slower under weak electrical fields. In the case of isothermal field-assisted sintering of two-phase, 50 vol% 3YSZ-alumina, the composites exhibit an incubation time for the onset of the flash event. Weaker applied fields and lower temperatures lengthen the incubation period. The effect is highly non-linear. For example at 1300°C and 150 V cm–1 the flash occurs nearly instanteously (in 10 s), but extends to two hours at 1275°C and 65 V cm–1. This behaviour is reminiscent of nucleation and growth phenomena in chemically driven experiments involving phase transformations in the solid state. Here, a model for nucleation under electrical driving forces, based upon the growth of embryos of colossal permittivity is presented. The flash sintering was also studied for composites with in-creasing volume faction of alumina in zirconia (10-50 vol%). The flash onset temperature or the incubation time for the 3YSZ-alumina composites increases with increasing the alumina volume fraction.In case of CHR experiments of hydroxyapatite, flash effect was shown at 840°C for an applied field of 2000 V cm-1. All the flash sintered samples show stable hydroxyapatite phase. However the sample sintered at 500 V cm-1 requires higher sintering temperature and shows enhanced preferred orientation due to higher diffusivity along c-axis. In case of alumina, field in excess to 1000 V cm-1 are re-quired to induce flash effect, whereas doped alumina shows flash sintering at 1000 V cm-1." @default.
• W47396089 created "2016-06-24" @default.
• W47396089 creator A5018544613 @default.
• W47396089 date "2014-06-16" @default.
• W47396089 modified "2023-09-23" @default.
• W47396089 title "Sintering of Ceramic Materials Under Electric Field" @default.
• W47396089 cites W1452222056 @default.
• W47396089 cites W1972443618 @default.
• W47396089 cites W1979901877 @default.
• W47396089 cites W1999578410 @default.
• W47396089 cites W2008691186 @default.
• W47396089 cites W2020150365 @default.
• W47396089 cites W2025283853 @default.
• W47396089 cites W2030349230 @default.
• W47396089 cites W2035777378 @default.
• W47396089 cites W2040983837 @default.
• W47396089 cites W2042917254 @default.
• W47396089 cites W2055093469 @default.
• W47396089 cites W2059524120 @default.
• W47396089 cites W2065751523 @default.
• W47396089 cites W2067097301 @default.
• W47396089 cites W2069371884 @default.
• W47396089 cites W2073910950 @default.
• W47396089 cites W2075164426 @default.
• W47396089 cites W2084065960 @default.
• W47396089 cites W2109500801 @default.
• W47396089 cites W2130439369 @default.
• W47396089 cites W2132146243 @default.
• W47396089 cites W2136845844 @default.
• W47396089 cites W2140600334 @default.
• W47396089 cites W2159713436 @default.
• W47396089 cites W2168646454 @default.
• W47396089 cites W2288817865 @default.
• W47396089 cites W2325112537 @default.
• W47396089 cites W2887194281 @default.
• W47396089 cites W654434355 @default.
• W47396089 hasPublicationYear "2014" @default.
• W47396089 type Work @default.
• W47396089 sameAs 47396089 @default.
• W47396089 citedByCount "0" @default.
• W47396089 crossrefType "dissertation" @default.
• W47396089 hasAuthorship W47396089A5018544613 @default.
• W47396089 hasConcept C104779481 @default.
• W47396089 hasConcept C121332964 @default.
• W47396089 hasConcept C123609680 @default.
• W47396089 hasConcept C133347239 @default.
• W47396089 hasConcept C134132462 @default.
• W47396089 hasConcept C142362112 @default.
• W47396089 hasConcept C153349607 @default.
• W47396089 hasConcept C159985019 @default.
• W47396089 hasConcept C191897082 @default.
• W47396089 hasConcept C192562407 @default.
• W47396089 hasConcept C2777526259 @default.
• W47396089 hasConcept C2777581544 @default.
• W47396089 hasConcept C60799052 @default.
• W47396089 hasConcept C62520636 @default.
• W47396089 hasConcept C97355855 @default.
• W47396089 hasConceptScore W47396089C104779481 @default.
• W47396089 hasConceptScore W47396089C121332964 @default.
• W47396089 hasConceptScore W47396089C123609680 @default.
• W47396089 hasConceptScore W47396089C133347239 @default.
• W47396089 hasConceptScore W47396089C134132462 @default.
• W47396089 hasConceptScore W47396089C142362112 @default.
• W47396089 hasConceptScore W47396089C153349607 @default.
• W47396089 hasConceptScore W47396089C159985019 @default.
• W47396089 hasConceptScore W47396089C191897082 @default.
• W47396089 hasConceptScore W47396089C192562407 @default.
• W47396089 hasConceptScore W47396089C2777526259 @default.
• W47396089 hasConceptScore W47396089C2777581544 @default.
• W47396089 hasConceptScore W47396089C60799052 @default.
• W47396089 hasConceptScore W47396089C62520636 @default.
• W47396089 hasConceptScore W47396089C97355855 @default.
• W47396089 hasLocation W473960891 @default.
• W47396089 hasOpenAccess W47396089 @default.
• W47396089 hasPrimaryLocation W473960891 @default.
• W47396089 hasRelatedWork W2030097854 @default.
• W47396089 hasRelatedWork W2105065606 @default.
• W47396089 hasRelatedWork W2122483486 @default.
• W47396089 hasRelatedWork W2124972061 @default.
• W47396089 hasRelatedWork W2139715195 @default.
• W47396089 hasRelatedWork W2168749345 @default.
• W47396089 hasRelatedWork W2321418798 @default.
• W47396089 hasRelatedWork W2766733937 @default.
• W47396089 hasRelatedWork W2947125852 @default.
• W47396089 hasRelatedWork W2967905254 @default.
• W47396089 hasRelatedWork W2974817722 @default.
• W47396089 hasRelatedWork W3025709459 @default.
• W47396089 hasRelatedWork W3034441825 @default.
• W47396089 hasRelatedWork W3044633706 @default.
• W47396089 hasRelatedWork W3080079719 @default.
• W47396089 hasRelatedWork W3129302601 @default.
• W47396089 hasRelatedWork W3140344931 @default.
• W47396089 hasRelatedWork W3163269199 @default.
• W47396089 hasRelatedWork W3177403632 @default.
• W47396089 hasRelatedWork W3210253827 @default.
• W47396089 isParatext "false" @default.
• W47396089 isRetracted "false" @default.
• W47396089 magId "47396089" @default.
• W47396089 workType "dissertation" @default.