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Properties of Mullite Powder Prepared by Coprecipitation and Microstructure of Fired Bodies

Hamano, K ; Sato, T ; Nakagawa, Z-E

Yōgyō Kyōkaishi, 1986-01, Vol.94 (8), p.818-822

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Title:
Properties of Mullite Powder Prepared by Coprecipitation and Microstructure of Fired Bodies
Author: Hamano, K ; Sato, T ; Nakagawa, Z-E
Is Part Of: Yōgyō Kyōkaishi, 1986-01, Vol.94 (8), p.818-822
Notes: ObjectType-Article-2
SourceType-Scholarly Journals-1
content type line 23
ObjectType-Feature-1
Description: A mullite powder was prepared from aluminum isopropoxide and methyl silicate by coprecipitation using a dilute ammonium aqueous solution. Properties and microstructure of fired bodies were examined. The results were compared with those from a sol mixture (SM) and oxide mixture (OX). The coprecipitated powder (Cp), the primary particle size of which was approx 200 A, was amorphous by X-ray diffraction analysis. On heating, the amorphous phase changed into spinel phase at approx 980 deg C, and then into mullite phase at approx 1250 deg C. Mullite specimens calcined at 800 or 1000 deg C and fired at 1780 deg C for 1 h showed a high bulk density of 3.14 g/cm exp 3 (relative density 99%). Lattice parameters, a sub 0 and b sub 0 , of mullite decreased with increasing firing temperature from 1500-1690 deg C, but a sub 0 increased at 1780 deg C. Cp specimens contained the smallest amount of glass phase in the three specimens fired at 1780 deg C. 16 ref.--AA
Language: Japanese

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