TiB_2-(2mol%Y_2O_3-ZrO_2)複合材料の力学的性質と焼結性に及ぼすSiC添加の影響

概要

論文の詳細を見る
Ceramic TiB_2-19.0-19.5 wt% (2 mol%Y_2O_3-ZrO_2) composites with 2.5-5.0 wt% SiC were fabricated by hot isostatic pressing (HIP) with and without a glass encapsulation. The effects of SiC addition on the mechanical properties and siterability of TiB_2-20 wt% (2 mol%Y_2O_3-ZrO_2) HIP'ed bodies were investigated. The addition of SiC improved the sinterability of TiB_2-20 % (2 mol%Y_2O_3-ZrO_2) appreciably. Composites of TiB_2-19.0-19.5 wt% (2 mol%Y_2O_3-ZrO_2) with 2.5-5.0 wt% SiC densified up to 96.7% of their theoretical densities by vacuum sintering at 1700℃ for 14.4 ks. These sintered bodies almost fully densified by capsule-free-HIP. On the other hand, TiB_2-20 wt% (2 mol%Y_2O_3-ZrO_2) densified up to 63.7% by the same vacuum sintering. The addition of SiC was also effective in retarding the grain growth of TiB_2 and ZrO_2. The grain sizes of TiB_2 and ZrO_2 of TiB_2-19.0-19.5 wt% (2 mol%Y_2O_3-ZrO_2)-2.5-5.0 wt%SiC HIP'ed bodies were about 1.5 and 1.2 μm, respectively. They were about 2/3 of those of TiB_2-20 wt% (2 mol%Y_2O_3-ZrO_2) HIP'ed bodies. The three-point bending strengths of TiB_2-19.0-19.5 wt% (2 mol%Y_2O_3-ZrO_2)-2.5-5.0 wt%SiC glass-encapsulated-HIP'ed bodies were 1240 MPa, which is slightly higher than that of TiB_2-20 wt% (2 mol%Y_2O_3-ZrO_2) HIP'ed bodies. Vickers hardness and fracture toughness were not affected by the addition of 2.5-5.0 wt% SiC. The mechaical properties of TiB_2-(2 mol%Y_2O_3-ZrO_2) HIP'ed bodies were controlled by the monoclinic ZrO_2 ratio in Zr_2 and monoclinic ZrO_2 content in HIP'ed bodies, as we have reported in the previous paper. The addition of SiC affected them only slightly, so that the mechanical properties were also little affected.
社団法人日本セラミックス協会の論文
1992-05-01

TiB_2-(2mol%Y_2O_3-ZrO_2)複合材料の力学的性質と焼結性に及ぼすSiC添加の影響

スポンサーリンク

概要

著者

関連論文

スポンサーリンク