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Preparation of High‐Purity ZrSiO 4 Powder Using Sol–Gel Processing and Mechanical Properties of the Sintered Body
Author(s) -
Mori Toshiyuki,
Yamamura Hiroshi,
Kobayashi Hidehiko,
Mitamura Takashi
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb05594.x
Subject(s) - materials science , calcination , hydrolysis , crystallization , microstructure , phase (matter) , chemical engineering , composite material , chemistry , biochemistry , catalysis , organic chemistry , engineering
Effects of the concentration of ZrOCl 2 , calcination temperature, heating rate, and the size of secondary particles after hydrolysis on the preparation of high‐purity ZrSiO 4 fine powders from ZrOCl 2 .8H 2 O (0.2 M to 1.7 M ) and equimolar colloidal SiO 2 using sol–gel processing have been studied. Mechanical properties of the sintered ZrSiO 4 from the high‐purity ZrSiO 4 powders have been also investigated. Single‐phase ZrSiO 4 fine powders were synthesized at 1300°C by forming ZrSiO 4 precursors having a Zr–O–Si bond, which was found in all the hydrolysis solutions, and by controlling a secondary particle size after hydrolysis. The conversion rate of ZrSiO 4 precursor gels to ZrSiO 4 powders from concentrations other than 0.4 M ZrOCl 2 .8H 2 O increased when the heating rate was high, whereupon the crystallization of unreacted ZrO 2 and SiO 2 was depressed and the propagation and increase of ZrSiO 4 nuclei in the gels were accelerated. The density of the ZrSiO 4 sintered bodies, manufactured by firing the ZrSiO 4 compacts at 1600° to 1700°C, was more than 95% of the theoretical density, and the grain size ranged around 2 to 4 μm. The mechanical strength was 320 MPa (room temperature to 1400°C), and the thermal shock resistance was superior to that of mullite and alumina, with fairly high stability at higher temperatures.