Health & Environmental Research Online (HERO)


Print Feedback Export to File
7010046 
Journal Article 
Alumina ceramics doped with manganese titanate via applying Mn-Ti-O coatings to corundum micropowder 
Abyzov, AM; Khristyuk, NA; Kozlov, VV; Shakhov, FM; , 
2020 
0 
Journal of the Korean Ceramic Society
ISSN: 1229-7801 
SPRINGER HEIDELBERG 
HEIDELBERG 
57 
6 
692-707 
WOS:000567088900001 
The aim of this work was (i) to develop an untraditional method of alumina doping that ensures low sintering temperature and (ii) to obtain dense engineering ceramics with good mechanical properties by conventional sintering. A nanostructured coating of manganese-titanium oxides was applied to alpha-Al(2)O(3)micropowder particles using liquid-phase synthesis of Mn-Ti-O-C-H xerogel and its annealing. The alumina modified in this way was sintered at 1300-1400 degrees C in air. The sintering process was accompanied by the formation of manganese metatitanate MnTiO3. The sintered samples have the relative density of about 97%, the bending strength of >= 260 MPa, and the Vickers microhardness of >= 16 GPa. The longitudinal and transverse sound velocities were measured, from which the Poisson's ratio of 0.24 and the Young's modulus of >= 360 GPa were calculated. Modification with MnTiO(3)precursors yielded higher mechanical properties of ceramics than modification with a ready MnTiO(3)coating. The results are compared with the properties of Al(2)O(3)doped with Mn-Ti-O formulations in other studies, and of industrial alumina ceramics. 
Alumina ceramics; Sintering additives; Manganese titanate; Nanocoating; Mechanical properties