Effect of Ni content and Al2O3 particle size on the thermal and mechanical properties of Al2O3/Ni composites prepared by spark plasma sintering

Irshad, Hafiz Musammil (författare): King Fahd University of Petroleum & Minerals, Saudi Arabia

Hakeem, Abbas Saeed (författare): King Fahd University of Petroleum & Minerals, Saudi Arabia

Ahmed, Bilal Anjum (författare): King Fahd University of Petroleum & Minerals, Saudi Arabia

Ali, Sharafat, 1976- (författare): Linnéuniversitetet,Institutionen för byggd miljö och energiteknik (BET),Glass group

Ali, Sadaqat (författare): Imam Abdulrahman bin Faisal University, Saudi Arabia

Ehsan, Muhammad Ali (författare): King Fahd University of Petroleum & Minerals, Saudi Arabia

Laoui, Tahar (författare): King Fahd University of Petroleum & Minerals, Saudi Arabia

(creator_code:org_t)

Elsevier, 2018
2018
Engelska.
Ingår i: International journal of refractory metals & hard materials. - : Elsevier. - 0263-4368. ; 76, s. 25-32

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Abstract Ämnesord

Stäng

Alumina-nickel composites were prepared by carrying out spark plasma sintering (SPS) of nano-sized and micro-sized Al2O3particles with 15–45 wt% Ni powders. The powder materials were sintered at a temperature of1400 °C under a constant uniaxial pressure of 50 MPa. FESEM micrographs of the products showed uniformlydispersed nickel inclusions in both matrices at intergranular positions. Presence of Al2O3as the major phasealong with Ni as the minor phase was conﬁrmed using XRD analysis. Thermal and mechanical properties of thenano- and micro-sized Al2O3/Ni composites were investigated. The thermal conductivity of nano-sized aluminacomposites was seen to increase with the increase in nickel content, however, an opposite trend was observed formicro-sized alumina-based composites. Moreover, thermal conductivities of all the composites decreased withincrease in temperature. The composites also showed high hardness and fracture toughness values of up to19.6 GPa and 4.71 MPa ∗ m1/2, respectively, and relative density values, between 79 and 99%, that decreasedwith increasing Ni content. Furthermore, the nano-sized Al2O3/Ni composites showed thermal and mechanicalproperties superior to those of the micro-sized Al2O3/Ni composite.

Av författaren/redakt...: Irshad, Hafiz Mu ...; Hakeem, Abbas Sa ...; Ahmed, Bilal Anj ...; Ali, Sharafat, 1 ...; Ali, Sadaqat; Ali, Sameer; visa fler...; Ehsan, Muhammad ...; Laoui, Tahar; visa färre...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Keramteknik

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