Abstract
The characteristics and formation mechanisms of microstructure imperfections in two sets of submicron WC–10wt.%Co cemented carbides, which are fabricated by vacuum and low-pressure sintering, respectively, are deeply analyzed. Main imperfections are pore-Co-pool in the vacuum-sintered samples. The number of pore-Co-pool is obviously reduced by low-pressure sintering, but many porous microstructures with poor-Co or Co-free are easily introduced; the impurity segregation is also easily formed. Transverse rupture strength (TRS) of samples is strongly affected by the characteristics and size of imperfections. Two linear relationships between TRS and pore size are experimentally established, and a critical pore size has been calculated to be 28.8μm.
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