In-situ pressureless sintering MgAlON-MgO ceramic from spent MgO-C brick towards friction material and refractory applications

MgAlON-MgO ceramic was in-situ synthesized at 1600℃ from spent MgO-C brick by pressureless sintering towards friction material and refractory applications, respectively. The flexural strength of MgAlON-MgO ceramic reaches as high as 172MPa with 11.1% utilization ratio of spent MgO-C brick. Moreover, MgAlON-MgO ceramic still has a good flexural strength up to 46MPa when utilization ratio of spent MgO-C brick increases to 52.9%. The impurities introduced by the spent brick distribute in MgAlON-MgO ceramic in the form of CaMgSiO 4 and MgFe 2 O 4 . CaMgSiO 4 increases the density of MgAlON-MgO ceramic and subsequently enhance its flexural strength, while MgFe 2 O 4 has no more obvious effect on those of the ceramic. Hence, MgAlON-MgO ceramic with different strength can be controllably prepared by simply adjusting utilization ratio of spent MgO-C brick, which maybe use as the friction material and refractory.