Abstract
Basing on the systematical research of the powder properties of calcined dolomite mineral (CM) obtained from raw dolomite mineral (RDM), a novel Al2O3-CA6-MA/Ni multi-phase composite was developed using the in-situ generated strengthening-toughening phases of calcium hexaluminate (CA6) and magnesium aluminate spinel (MA) being introduced into an Al2O3-Ni system by regulating the reaction between CM and Al2O3. Under the anisotropic growth behaviour of CA6, the composite obtained a unique “ring” microstructure, while the mechanical properties were improved. In addition, the strengthening-toughening mechanisms related to this modification and improvement were studied in depth, that is, the pull out and fracture behaviours of CA6 and MA grains promoted crack deflection, bridging and branching, and the nano precipitation behaviour of metal Ni particles at the boundaries between CA6 and Al2O3 grains realized the bonding effect. This finding has important practical significance and economic value for the deep processing and application of RDM.
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