Reaction bonded and post-sintered silicon nitride ceramics was fabricated using ZrO
2-MgAl
2O
4 as sintering additives. It was clarified that added ZrO
2 was act as nitridation enhanced effect under MgAl
2O
4 coexistence during reaction bonding process, and nitridation of the silicon was also completed lower temperature than that of Silicon without ZrO
2-MgAl
2O
4. The post-sintered specimen had a four-point bending strength of 850 MPa, which was obtained same fracture strength at same additive system prepared using high purity silicon nitride powder as a starting material.
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