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Germanium‐Modified Cordierite Ceramics with Low Thermal Expansion
Author(s) -
AGRAWAL D. K.,
STUBICAN V. S.,
MEHROTRA Y.
Publication year - 1986
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.1151-2916.1986.tb07382.x
Subject(s) - cordierite , germanium , materials science , ionic bonding , thermal expansion , ceramic , mineralogy , scanning electron microscope , silicon , microstructure , chemical engineering , composite material , metallurgy , chemistry , ion , organic chemistry , engineering
Magnesium cordierite ceramics modified by ionic substitution of Ge for Si were synthesized, fabricated, and characterized. The effect of the amount of ionic substitution on thermal expansion was investigated. Ionic substitution of ∼20% germanium for silicon reduces thermal expansion to zero at room temperature. A processing schedule to achieve nearly theoretical densities in germanium cordierite specimens was developed, and the microstructures of sintered samples were examined by scanning electron microscopy. Other thermal properties such as specific heat and thermal conductivity were also measured for the germanium‐modified cordierites.