JPH064510B

PURPOSE:To obtain the title composite sintered product which contains prescribed amounts of ZrO2, P2O5, and SiO2 respectively, specifies the total amount of resting MgO and Al2O3 below a certain level, and contains zirconyl phosphate as the main crystal phase, and zircon as the second crystal phase,...

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Bibliographic Details
Main Authors WATANABE KEIICHIRO, OOHASHI KUROAKI
Format Patent
LanguageEnglish
Published 19.01.1994
Edition5
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:PURPOSE:To obtain the title composite sintered product which contains prescribed amounts of ZrO2, P2O5, and SiO2 respectively, specifies the total amount of resting MgO and Al2O3 below a certain level, and contains zirconyl phosphate as the main crystal phase, and zircon as the second crystal phase, thus showing excellent thermal shock resistance and heat resistance. CONSTITUTION:The present invention provides a low thermal expansion zirconyl phosphate-zircon composite sintered product with is composed of 58.2-65.3wt.% of ZrO2; 17.4-37.1wt.% of P2O5; 1.6-19.0wt.% of SiO2; and less than 2wt.%, based on the rest amount, of MgO and Al2O3 and has following properties: containing zirconyl phosphate as the main crystal phase and zircon as the second crystal phase, having less than 30X10<-7>/ deg.C heat expansion coefficient from room temperature to 1,400 deg.C and melting over 1,600 deg.C. The composite sintered product according to the present invention has a promising potential to be used widely as a low thermal expansion material with high thermal shock resistance, such as a rotary regeneration type ceramic heat exchanger or transfer type heat exchanger, when it is, for example, extruded in a honeycomb structure.
Bibliography:Application Number: JP19870129873