| 摘要 |
A dense, self-reinforced Si3N4 ceramic body and a method of making such body. The body has a composition that includes: (a) Si3N4; (b) a glassy grain boundary phase containing oxygen, nitrogen, Mg, Y, Si, Zr, and at least one of Ti and Al; and (c) a second crystalline phase containing ZrO2; and (d) crystalline phases of metal zirconium silicide and/or metal zirconium silicon nitride. The ceramic exhibits high fracture toughness and high fracture strength and has a density at least 98 % of theoretical. |
