Microstructural changes of titanium diboride by addition of Ta and Ni dopants

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Microstructural changes of titanium diboride by addition of Ta and Ni dopants

Popis výsledku v původním jazyce

Materials predetermined for high temperature applications are usuallynbased on the ceramics which possess extremely low fracture resistance duento an inherent brittleness. The possible way how to change this limitation can benoptimisation of the microstructure, i.e., grain arrangement and inter-grain bondingnas is successfully used in silicon nitride. The weak point in such materials is usuallynlower temperature resistance of the phase forming inter-grain interface, thereforenthe application of silicon nitride is limited to the temperatures around 1000°C.nOn the contrary, titanium diboride can serve up to 2000°C and the limitationnis in processing side where solid state sintering is demanding and requires highernsintering temperatures leading in extreme grain growth. In addition, when liquidnphase sintering is applied the high temperature properties are limited by thisnphase. The aim of this work was to describe in detail microstructural developmentnwhen combination of used dopants can form high temperature resistant solidnsolution. Microstructural changes of pure titanium diboride doped by variousnamounts of nickel and tantalum were investigated using ceramographic methodsnsupplemented by elemental SEM microanalysis and X-ray analysis. Materialsnused in this study were prepared by the standard and the rapid hot-pressingnmethod at temperatures around 2000°C. The effect of processing route appliednas well as the effect of selected metallic elements was studied from the grainngrowth and a porosity development point of view. The link between resultingnmicrostructure and basic mechanical properties was found and positive influencenof dopants was determined.n

Název v anglickém jazyce

Microstructural changes of titanium diboride by addition of Ta and Ni dopants

Popis výsledku anglicky

Materials predetermined for high temperature applications are usuallynbased on the ceramics which possess extremely low fracture resistance duento an inherent brittleness. The possible way how to change this limitation can benoptimisation of the microstructure, i.e., grain arrangement and inter-grain bondingnas is successfully used in silicon nitride. The weak point in such materials is usuallynlower temperature resistance of the phase forming inter-grain interface, thereforenthe application of silicon nitride is limited to the temperatures around 1000°C.nOn the contrary, titanium diboride can serve up to 2000°C and the limitationnis in processing side where solid state sintering is demanding and requires highernsintering temperatures leading in extreme grain growth. In addition, when liquidnphase sintering is applied the high temperature properties are limited by thisnphase. The aim of this work was to describe in detail microstructural developmentnwhen combination of used dopants can form high temperature resistant solidnsolution. Microstructural changes of pure titanium diboride doped by variousnamounts of nickel and tantalum were investigated using ceramographic methodsnsupplemented by elemental SEM microanalysis and X-ray analysis. Materialsnused in this study were prepared by the standard and the rapid hot-pressingnmethod at temperatures around 2000°C. The effect of processing route appliednas well as the effect of selected metallic elements was studied from the grainngrowth and a porosity development point of view. The link between resultingnmicrostructure and basic mechanical properties was found and positive influencenof dopants was determined.n

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20504 - Ceramics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů