Aluminum Company of America

George H Armstrong

Willy M Balaba

Suzanne Kauffman

Princewill N Anyalebechi

Susanne Marie Opalka

Frankie E Phelps

Anthony A Parker

Todd T Stanzione

A novel polymer-coated carbon, metal, or ceramic substrate is coated with an aromatic polysiloxane liquid coating solution polymerized to have non-linear, ladder silicon to oxygen bonding. A carbon, metal, or ceramic layer or substrate coated with the aromatic polysiloxane liquid polymer provides enhanced thermal protection and oxidative stability. The novel aromatic polysiloxane liquid polymer-coated carbon, metal, or ceramic substrate preferably includes a non-linear, ladder aromatic polysiloxane polymer-coated carbon, metal, or ceramic substrate such as provided by polyphenylsiloxane polymer having the general formula R.sub.n SiO.sub.(4-n)/2, wherein R comprises phenyl radical, and n has an average value of about 0.95 to 1.05.

Siloxane coating process for metal or ceramic substrates

A polymer-coated carbon is coated with an aromatic polysiloxane liquid coating solution polymerized to have non-linear, ladder-like silicon to oxygen bonding. Carbon fiber or fabric coated with aromatic polysiloxane liquid polymer provides enhanced thermal protection and oxidative stability. The aromatic polysiloxane liquid polymer-coated carbon preferably includes a non-linear, ladder-like aromatic polysiloxane polymer-coated carbon such as provided by polyphenyl-siloxane polymer having the general formula R.sub.n SiO.sub.(4-n)/2, wherein R comprises phenyl radical, and n has an average value of about 0.95 to 1.05.

Siloxane coating process for carbon or graphite substrates

When a dispersion of oxide ceramic particles in certain volatile organic solvents is mixed with less than about 2 percent by weight (based on the weight of particles) of an oligomeric polysiloxanol dispersant, and the dispersion allowed to settle, the oligomer provides a multiplicity of OH groups, many of which are available for interactive bonding to the surfaces of the particles. The net result is that the particles settle more slowly; also, the sediment has a density higher than that of sediment from a dispersion of the same particles in the same solvent mixed with the monomeric silane from which the oligomer was formed. Exceptionally dense and strong 'tape', for making sintered circuitized multilayered ceramic structures, is produced by capitalizing on this phenomenon. The effectiveness of the oligomer is predicated upon the prehydrolysis of the siloxane, prior to forming the dispersion. In a stable suspension with the binder, the slip viscosity is lowered compared to that of a slip containing no dispersant, or the siloxane monomer as dispersant, at dynamic shear rates in the range of 5-70 sec.sup.-1. Green cards cut from the tape have greater pull strength, higher Young's modulus, higher stress at break, higher adhesion to each other in a stack, and higher strain at break than green cards made from a slip containing no polysiloxanol oligomer.

Densified ceramic green sheet and stack having conductors therein

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New Kensington, PA, United States of America

George H Armstrong