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Low‐Thermal‐Expansion Polycrystalline Zirconyl Phosphate Ceramic: Solid‐Solution and Microcracking‐Related Properties
Author(s) -
YAMAI IWAO,
OTA TOSHITAKA
Publication year - 1987
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.1151-2916.1987.tb05711.x
Subject(s) - materials science , thermal expansion , crystallite , grain size , ceramic , sintering , grain growth , composite material , mineralogy , metallurgy , chemistry
The effects of the addition of Ta205 or Nb205 on the sintering and refractory properties of 2ZrO 2 ·P 2 O 5 ‐based ceramics have been investigated. The solid solution with Nb 2 O 5 has a lower average thermal expansion coefficient than the pure phase. The strength of the polycrystalline ceramic is reduced when the grain size exceeds the transition grain size for microcracking. The thermal expansion of the ceramic is abruptly lowered when the grain size exceeds a value which should be termed the “second transition grain size” for additional wider microcracking. SiO 2 was found most effective for inhibiting grain growth to prevent microcracking and for obtaining a strong ceramic.