초록 ▼

Silicon nitride sintered bodies are disclosed herein which each contain an intergranular phase. The intergranular phase contained in the sintered body is crystallized into diopside structure type crystals and apatite structure type crystals. The silicon nitride sintered bodies have excellent density

Silicon nitride sintered bodies are disclosed herein which each contain an intergranular phase. The intergranular phase contained in the sintered body is crystallized into diopside structure type crystals and apatite structure type crystals. The silicon nitride sintered bodies have excellent density and mechanical strength as well as extremely excellent static fatigue characteristics, and therefore are applicable as various mechanical structural parts such as engine parts, gas turbine parts, etc.

대표청구항 ▼

A silicon nitride sintered body containing an intergranular phase, said intergranular phase being substantially crystallized into diopside structure type crystals and apatite structure type crystals, wherein the diopside structure is M1M2M32M46 in which M1 is at least one element selected from the g

A silicon nitride sintered body containing an intergranular phase, said intergranular phase being substantially crystallized into diopside structure type crystals and apatite structure type crystals, wherein the diopside structure is M1M2M32M46 in which M1 is at least one element selected from the group consisting of Ca, Y, a rare earth element, Mg, Fe and Ni; M2 is at least one element selected from the group consisting of Mg, Al, Fe, Ni and Si; M3 is at least one element selected from the group consisting of Si and Al; and M4 is at least one element selected from the group consisting of O and N, while the apatite structure is M5(M6M74)3M8 in which M5 is at least one element selected from the group consisting of Ca, Y, a rare earth element, Mg, Fe and Ni; M6 is at least one element selected from the group consisting of Si and Al; M7 is at least one element selected from the group consisting of O and N; and M8 is at least one element selected from the group consisting of O and N.