チタン酸アルミニウム-粘土複合焼結体による赤外線放射材質の開発

概要

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Sintered aluminum titanate has a very low thermal expansion and an infrared radiative property selectively emitting large amounts of far infrared rays. However, it is weak in mechanical strength. Spectral infrared emittance, thermal expansion coefficient, and mechanical strength of aluminum titanate-clay composites were studied to develop a material for infrared radiators. The composites containing 10 to 50 mass% clay has low spectral emittance in the range of 5000 to 2500 cm^<-1> and high emittance in the range of 1500 to 360 cm^<-1>. The bending strength of the composite increased with increasing clay content. The composite with a clay content of 30 mass% formed by hand pressing using a plaster mold and fired at 1500℃ had a large strength for infrared radiators; 80 MPa. The average linear thermal expansion coefficient from room temperature to 800℃ of the 30 mass% clay-containing composite fired at 1500℃ was lower than 2.5 × 10^<-6>/℃.
社団法人日本セラミックス協会の論文
1997-11-01