TY - JOUR
T1 - Pore formation in the pyrolysis of polymers to ceramics
AU - Yao, Horran
AU - Kovenklioglu, Suphan
AU - Kalyon, Dilhan M.
PY - 1990/10/1
Y1 - 1990/10/1
N2 - Fabrication of a nonoxide ceramic SIC from pyrolysis of a polymer precursor, i.e. poly(carbosilane) was investigated. During pyrolysis the generation of small molecules such as hydrogen and methane results in the formation of pores. A mathematical model was developed to study the nucleation and growth of gas bubbles which lead to such pore formation. The mathematical model has the capability of predicting porosity and its distribution which is influenced by temperature, pressure, as well as the thickness, chemistry, and physical properties of the pyrolyzing object. Thermogravimetric analysis and scanning electron microscopy were used to study the pore formation and possible cracking during pyrolysis. Submicron pores were observed in the thicker fibers. Based on the best estimate of physical properties, the mathematical model is capable of predicting the critical thickness of the pyrolyzing object for which there will be pore formation.
AB - Fabrication of a nonoxide ceramic SIC from pyrolysis of a polymer precursor, i.e. poly(carbosilane) was investigated. During pyrolysis the generation of small molecules such as hydrogen and methane results in the formation of pores. A mathematical model was developed to study the nucleation and growth of gas bubbles which lead to such pore formation. The mathematical model has the capability of predicting porosity and its distribution which is influenced by temperature, pressure, as well as the thickness, chemistry, and physical properties of the pyrolyzing object. Thermogravimetric analysis and scanning electron microscopy were used to study the pore formation and possible cracking during pyrolysis. Submicron pores were observed in the thicker fibers. Based on the best estimate of physical properties, the mathematical model is capable of predicting the critical thickness of the pyrolyzing object for which there will be pore formation.
KW - Ceramics
KW - Polymers
KW - Pore formation
KW - Pyrolysis
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U2 - 10.1080/00986449008911489
DO - 10.1080/00986449008911489
M3 - Article
AN - SCOPUS:0003728845
SN - 0098-6445
VL - 96
SP - 155
EP - 175
JO - Chemical Engineering Communications
JF - Chemical Engineering Communications
IS - 1
ER -