ホットプレス法によるTiB_2-ZrB_2系セラミックス焼結体の作製とその機械的特性

概要

論文の詳細を見る
The TiB_2-ZrB_2 ceramic system, which has a range of high hardnesses and electrical conductivities, was sintered by the hot-pressing method from mixed powders of TiB_2 and ZrB_2. The mixed powders calcined at 1450℃ for 5.4 ks with compositions from 100 mol% TiB_2 to 100 mol% ZrB_2(20 mol% step)were preformed at a pressure of 98 MPa, and then hot-pressed at 2000℃ for 3.6 ks under a pressure of 31.2 MPa in an ambient Ar gas. The system was found to form solid solutions between TiB_2 and ZrB_2 crystal structures. (TiB_2)_<0.6> (ZrB_2)_<0.4> ceramics, for example, had a relative density of 96.5%, hardness of 30.4 GPa, flexural strength of 354 MPa, fracture toughness(K_<IC>)of 3.87 MPa・M^<1/2> Young's modulus of 449 GPa, fracture energy of 16.5 J・m^<-2> and electrical conductivity of 6.8 MS・m^<-1>. The ceramics is expected to be used as a ceramic mold material that can be machined by electrical discharge and as electro-conductive high-temperature structural materials.
社団法人日本セラミックス協会の論文
1998-12-01