Free silicon in silicon nitride compacts can act us suitable liquid solveizt,for SilN$ and ussists in the CY to /3 phase transformation. The rate of trun.sformation depends on the size of the added silicon particles. When submicrometer silicon particles are added, the rate of transformation is more rapid than when large particles are added; the complete transformation can be uchieved ut 1700°C in 1 h.
The effects of ZrOZ and Yz03 on the densification of hotpressed Si3N4-Zr(Y)Oz composites have been studied. High density could not be obtained by the addition of pure or 3-mol%-Y2O3-doped ZrO2 in this composite; however, nearly full density (>97%) could be obtained in Si3N4 using 6-and 8-mol%-Y2O3-doped ZrOz. It is concluded that Y z 0 3 diffusing out from the added Zr(Y)Oz promoted the densification and that ZrOz also had some role in the formation of an oxynitride glass. [
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