Role of GB chemistry of silicon nitride based ceramics with respect to the mechanical properties - experimental and theoretical approach

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

Role of GB chemistry of silicon nitride based ceramics with respect to the mechanical properties - experimental and theoretical approach

Popis výsledku v původním jazyce

Six different sintering aids (Lu 2 O 3 , Yb 2 O 3 , Y 2 O 3 , Sm 2 O 3 , Nd 2 O 3 and La 2 O 3 ) were used for the processing of dense Si 3 N 4 ceramics. Room temperature fracture toughness, hardness and strength showed increasing tendency when the usedrare - earth element in the oxide additive changes from a large to a small rare - earth cation (i.e. from La 3+ to Lu 3+ ). Highest hardness, reasonably high fracture toughness and strength have the ceramic material with Lu 2 O 3 sintering additive. Thefirst principle calcul ations were used for the explanation of the fracture behaviour of the composites depending on the rare earth additive. The energy of fracture was calculated with respect to the chemical composition of GB. The experimental and theoretical results will be di scussed.

Název v anglickém jazyce

Role of GB chemistry of silicon nitride based ceramics with respect to the mechanical properties - experimental and theoretical approach

Popis výsledku anglicky

Six different sintering aids (Lu 2 O 3 , Yb 2 O 3 , Y 2 O 3 , Sm 2 O 3 , Nd 2 O 3 and La 2 O 3 ) were used for the processing of dense Si 3 N 4 ceramics. Room temperature fracture toughness, hardness and strength showed increasing tendency when the usedrare - earth element in the oxide additive changes from a large to a small rare - earth cation (i.e. from La 3+ to Lu 3+ ). Highest hardness, reasonably high fracture toughness and strength have the ceramic material with Lu 2 O 3 sintering additive. Thefirst principle calcul ations were used for the explanation of the fracture behaviour of the composites depending on the rare earth additive. The energy of fracture was calculated with respect to the chemical composition of GB. The experimental and theoretical results will be di scussed.

Druh

O - Ostatní výsledky

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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