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...Materials science forum vol pp online available since nov at www scientific net trans tech publications switzerland doi msf m montoya davila a pech canul b i c cinvestav saltillo carr mty km coah mexico merida antigua carretera progreso apdo postal cordemex yuc miguel edu mx max mda cmartin the effect of particle size distribution and ratio sic in sio p preforms on microstructure microhardness reinforcements modulus rupture superficial hardness al composites produced by pressureless infiltration has been investigated form plates cm x have o infiltrated alloy mg si wt for min under inert atmosphere powders with average are mixed porosity unimodal bimodal trimodal distributions prepared uniaxial compaction small large medium different ratios following levels results from characterization xrd sem energy dispersive ray spectrometry show that typical contains mgal spinel aln mgo phases formed during processing as well partially reacted silica it is found density reinforcement increase all w...