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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F15%3A00474196" target="_blank" >RIV/68081723:_____/15:00474196 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20504 - Ceramics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2015

Confidentiality

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