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Effects of Some Additives on Microstructure and Bending Strength of Aluminum Titanate Ceramics

Ohya, Y ; Hamano, K ; Nakagawa, Z-E

Yōgyō Kyōkaishi, 1986-01, Vol.94 (7), p.665-670

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  • Título:
    Effects of Some Additives on Microstructure and Bending Strength of Aluminum Titanate Ceramics
  • Autor: Ohya, Y ; Hamano, K ; Nakagawa, Z-E
  • É parte de: Yōgyō Kyōkaishi, 1986-01, Vol.94 (7), p.665-670
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    content type line 23
    ObjectType-Feature-1
  • Descrição: Effects of four additives on the microstructure and bending strength of aluminum titanate ceramics were investigated. Five wt.% of MgO, Fe sub 2 O sub 3 , Y sub 2 O sub 3 and ZrO sub 2 was added to a synthesized aluminum titanate powder which had a particle size of approx 1 mu m. Firing temperature was 1300, 1350 and 1400 deg C, and firing period was 2 h. The specimens were cooled in the furnace. MgO and Fe sub 2 O sub 3 dissolved into aluminum titanate at MgTi sub 2 O sub 5 and Fe sub 2 TiO sub 5 , respectively. All specimens containing additives had crystalline phases besides aluminum titanate. In the specimens fired at 1300 deg C and containing ZrO sub 2 , Y sub 2 O sub 3 , and no additive, corundum and rutile, decomposition products of aluminum titanate, were observed. Addition of MgO and Fe sub 2 O sub 3 increased the sinterability of aluminum titanate, but addition of ZrO sub 2 decreased it. The grain size of aluminum titanate in fired specimens increased with increasing firing temperature, but decreased with the addition of MgO, Y sub 2 O sub 3 and ZrO sub 2 . Grain boundary microcracking during cooling due to the marked anisotropy of the aluminum titanate crystals increased with increasing firing temperature, and specimens containing MgO showed very little microcracking. Only MgO-containing specimens, especially those fired at high temperatures, exhibited transgranular fracture. These results suggest that the addition of MgO increases fracture surface energy of the grain boundary. Thus, the bending strength of MgO-added specimens was highest, 1850 kgf /cm exp 2 at 1350 deg C. Other specimens containing additives also showed higher bending strengths, approx 500-800 kgf/cm exp 2 higher than blank specimens when fired at 1350 and 1400 deg C. The thermal expansion of fired specimens containing MgO was approx 0.7% at 1000 deg C, which caused very little microcracking during cooling. 20 ref.--AA
  • Idioma: Japonês
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