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Influence of La 2O 3 addition on hardness, flexural strength and microstructure of hot-pressing sintered WC–MgO bulk composites

Influence of La 2O 3 addition on hardness, flexural strength and microstructure of hot-pressing sintered WC–MgO bulk composites,10.1016/j.matdes.2010.

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Influence of La 2O 3 addition on hardness, flexural strength and microstructure of hot-pressing sintered WC–MgO bulk composites   (Citations: 2)
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A detailed investigation is carried out into the influences of the lanthanum oxide (La2O3) addition upon the microstructural characteristics and the mechanical properties of the WC–MgO composite bulk prepared by hot-pressing sintering. The results indicate that due to the unique properties of rare earth element such as high surface activity and large ionic radius, the addition of trace La2O3 can suppress the decarburization, promote the microstructural refinement and improve the particulate dispersion homogeneity and the particulate/matrix interfacial coherence. Consequently, the relative density of the sintered sample with 0.1wt.% La2O3 addition can be increased by 4.2% as compared with the sample without La2O3 addition. Mechanical properties of bulks were determined by hardness test and flexural strength measurement. The results showed the possibility of preparing high hardness and fracture strength WC–MgO composite materials with the La2O3 added.
Journal: Materials & Design - MATER DESIGN , vol. 32, no. 4, pp. 2125-2129, 2011
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