Mn^<2+>置換コーディエライト焼結体の作製とその赤外線放射特性

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Mn^<2+>-substituted cordierite solid solutions (Mg_2 _<(1-X)> Mn_<2X>Al_4Si_5O_<18>, X≦0.6) with a hexagonal crystal structure were prepared by solid state reaction. Expansion in the a-axis direction and contraction in the c-axis direction with increasing Mn^<2+>-substitution were caused by flattening deformation of MgO_6 octahedra. The lattice parameters for X=0.6 were a=0.989 nm and c=0.929 nm. The sintering temperature for densification lowered with increasing Mn^<2+>-substitution. Ceramics with 99% relative density were obtained at 1430℃ for X=0, at 1330℃ for X=0.25 and at 1230℃ for X= 0.6. The mean linear thermal expansion coeffiecients were (0.9-1.1)×10^<-6>℃^<-1> (20-800℃). Infrared radiation emissivities of ceramics increased with increasing relative density at surface temperatures 100-400℃ in the wave length range of 2.5-14.5 μm. Thus, the Mn^<2+>-substituted cordierite solid solutions with the theoretical density can be used as infrared radiation ceramics with low thermal expansion coeffiecients.
社団法人日本セラミックス協会の論文
1993-09-01