TY - JOUR
T1 - Gas Pressure and Temperature Dependences of Thermal Conductivity of Porous Ceramic Materials
T2 - Part 1, Refractories and Ceramics with Porosity below 30%
AU - Litovsky, Efim Ya
AU - Shapiro, Michael
PY - 1992/12
Y1 - 1992/12
N2 - A review of experimental results and theoretical models for thermal conductivities of ceramic materials with porosity less than 30% is given. It is shown that the abnormal non‐monotonic pressure and temperature dependences of thermal conductivity arise from the effects of microcracks and porous grain boundaries, characterizing many industrial refractories, and from the competitive influences of classical and novel mechanisms of heat transfer in composite multiphase materials. The latter mechanisms include segregation and surface diffusion of impurities and defects in crystal structure, and the mechanism arising from chemical conversion and gas emission, occurring within pores of ceramic materials. A fractal model of porous materials' structure is proposed and used for analysis, explanation, and classification of thermophysical properties of ceramic materials measured in various thermodynamic conditions.
AB - A review of experimental results and theoretical models for thermal conductivities of ceramic materials with porosity less than 30% is given. It is shown that the abnormal non‐monotonic pressure and temperature dependences of thermal conductivity arise from the effects of microcracks and porous grain boundaries, characterizing many industrial refractories, and from the competitive influences of classical and novel mechanisms of heat transfer in composite multiphase materials. The latter mechanisms include segregation and surface diffusion of impurities and defects in crystal structure, and the mechanism arising from chemical conversion and gas emission, occurring within pores of ceramic materials. A fractal model of porous materials' structure is proposed and used for analysis, explanation, and classification of thermophysical properties of ceramic materials measured in various thermodynamic conditions.
UR - http://www.scopus.com/inward/record.url?scp=65849460197&partnerID=8YFLogxK
U2 - 10.1111/j.1151-2916.1992.tb04445.x
DO - 10.1111/j.1151-2916.1992.tb04445.x
M3 - 文章
AN - SCOPUS:65849460197
SN - 0002-7820
VL - 75
SP - 3425
EP - 3439
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 12
ER -