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Priprava in karakterizacija ▫$M_2Si-Mg-TiB_2$▫ in ▫$Mg_2Si-TiC$▫ kompozitov [Elektronski vir]Kevorkijan, Varužan ; Škapin, Srečo D.Kompoziti z Mg2Si matrico diskontinuirno ojačeno s keramičnimi delci sodijo med zelo perspektivne inženirske material, saj združujejo nizko gostoto (ca. 1.9-2.1 g/cm3), ki je ca. 30% nižja od gostote ... aluminijevih zlitin ter visoko trdoto in modul elastičnosti v matrici katere tališče je dobrih 50% nad tališčem aluminija. V delu opisujemo pripravo Mg2Si-Mg-TiB2 in Mg2Si-TiC kompozitov, ki smo jih izdelali iz komercialnega Mg2Si prahu z dodatkom 20 vol. % keramične ojačitve (TiB2 ali TiC). V prvi seriji eksperimentov smo vzorce kompozitov izdelali s postopkom infiltracije pri atmosferskem tlaku in sicer tako, da smo iz zmesi Mg2Si prahu in keramične ojačitve z izostatskim stiskanjem pripravili porozne predoblike, ki smo jih v nadaljevanju infiltrirali z Mg talino v vakuumski peči pri temperaturi 50-100 °C nad tališčem magnezija V drugi seriji eksperimentov smo iz iste zmesi pripravili tablete nekoliko višje zelene gostote in jih reakcijsko sintrali pri atmosferskem tlaku v temperaturnem območju 1055-1065 °C, kar je ca. 20-30 °C pod tališčem Mg2Si, 0.5-1h v zaščitni atmosferi argona. Mikrostrukturo in fazno sestavo pripravljenih vzorcev smo analizirali z vrstičnim elektronskim mikroskopom in XRD. Merjenje trdot (HV) smo izvajali s standardnimi metodami pri sobni temperaturi. Rezultati so pokazali, da je in s postopkom infiltracije ter s postopkom reakcijskega sintranja možno dobiti praktično popolnoma goste kompozitne materiale, pri čemer so vrednosti izmerjenih trdot bile v primeru reakcijsko sintranih kompozitov ca. dvakrat višje.Source: Slovenski kemijski dnevi 2009, Maribor, 24. in 25. september 2009 [Elektronski vir] (11 str.)Type of material - conference contributionPublish date - 2009Language - slovenianCOBISS.SI-ID - 13466134
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Kevorkijan, Varužan | 04968 |
Škapin, Srečo D. | 11093 |
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