R6sum6-Des composites mullite-zircone contenant de 0 B 10 L en masse d'oxyde d'yttrium ont 6t6 synth6tis6s par frittage r6actif. L'augmentation de la tenacit6 de ces materiaux vis-h-vis des mullites classiques est discut6e sur base de la microstructure et des proprietes m6caniques.
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