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Si3N4 ceramics with high thermal conductivity and outstanding mechanical properties were prepared by adding β‐Si3N4 seeds and nanophase α‐Si3N4 powders as modifiers. The introduction of β‐Si3N4 seeds enhanced the growth of β‐Si3N4 grains. Owing to the interlocked structure induced by the β‐Si3N4 grains, the fracture toughness of Si3N4 ceramics reached a high value of 7.6 MPa·m1/2; also, the large‐sized...
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