MgO-Cr_2O_3系セラミックスの焼結特性と(Mg_<8-x>Cr_x) Cr_<l6>O_<32>(O≦x≦ 2.88)の生成

概要

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MgO and Cr_2O_3 powders were mixed in various ratios and pressed to form compacts. They were heated in the carbon powder bed. Starting compacts containing 53 to 63 mol%. Cr_2O_3 were densely sintered, particularly the sintered compact with 55 mol%. Cr_2O_3 was about 93% in relative density, and composed of (Mg_8-xCrx) Cr_l6O_32 (O≦x≦2.88) . pores with globular shape in the compacts suggested the sintering ill the presence of a liquid. Under reductive atmosphere coexisting with carbon, a liquid of the Cr-Cr_2O_3-MgO system is considered to form due to reduction of the Cr_2O_3 in the compact. During cooling, the (Mg 8-xCrx) Cr_l6O_32 may precipitate from the liquid. When the compound was exposed to air during heating, this phase was unstable and changed to MgCr_2O_4 and Cr_2O_3 at about 300'C.
社団法人日本セラミックス協会の論文
1996-12-01