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US 4,710,227 AGranted
Dispersion process for ceramic green body
AssigneeThe Dow Chemical Company
InventorsA. Dale Harley, Lawrence G. Duquette, Issam A. Khoury, Iwao Kohatsu
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Abstract
Preparation of a ceramic green body by hydrolyzing two groups of alkoxides to form a dispersion of their reaction product, concentrating the dispersion to a sediment without drying it, and admixing a binder solution, plasticizer and release agent with the sediment to make a ceramic slip formulation. The slip formulation is then cast as a ceramic green body. The proportions of alkoxides can be adjusted to produce a ceramic green body which is dielectric and useful for microcapacitors.
Claims63
A process comprising:
- (a) forming a hydrolyzable solution of a first group of alkoxides comprising at least one compound characterized as A(OR).sub.x,
- wherein A is at least one metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, Ge, Pb, Sb and Bi,
- a second group of alkoxides comprising at least one compound characterized as B(OR).sub.x,
- wherein B is at least one metal selected from the group consisting of Ti, Zr, Sc, Y, La, Nb, Fe, Ta, W, Mn, Sn, Mg, and Zn, and
- wherein R is a compound characterized as C.sub.y H.sub.z wherein y is an integer from 1 to 10,
- z is an integer selected from the group consisting of 2y, 2y+1 and 2y-1, and
- x is an integer from 1 to 7,
- such that said first and second groups of alkoxides are suitable to be hydrolyzed to form a compound characterized as ABO.sub.3,
- and an alcohol suitable to dissolve said first and second groups of alkoxides;
- (b) hydrolyzing said hydrolyzable solution to form a hydrolyzed dispersion of said compound characterized as ABO.sub.3 in said alcohol;
- (c) concentrating at least a portion of said dispersion to a sediment;
- (d) admixing a binder solution, a plasticizer, and a release agent with said sediment to make a ceramic slip formulation;
- and
- (e) preparing a ceramic green body from said slip formulation.
11 more elements
A ceramic green body prepared by a process comprising:
- (a) forming a hydrolyzable solution of a first group of alkoxides comprising at least one compound characterized as A(OR).sub.x,
- wherein A is at least one metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, Ge, Pb, Sb and Bi,
- and a second group of alkoxides comprising at least one compound characterized as B(OR).sub.x,
- wherein B is at least one metal selected from the group consisting of Ti, Zr, Sc, Y, La, Nb, Fe, Ta, W, Mn, Sn, Mg, and Zn, and
- wherein R is a compound characterized as C.sub.y H.sub.z wherein y is an integer from 1 to 10,
- z is an integer selected from the group consisting of 2y, 2y+1 and 2y-1, and
- x is an integer from 1 to 7,
- such that said first and second groups of alkoxides are suitable to be hydrolyzed to form a compound characterized as ABO.sub.3, and an alcohol suitable to dissolve said first and second groups of alkoxides;
- (b) hydrolyzing said hydrolyzable solution to form a hydrolyzed dispersion of said compound characterized as ABO.sub.3 in an alcohol;
- (c) concentrating at least a portion of said dispersion to a sediment;
- (d) admixing a binder solution, a plasticizer and a release agent with said sediment to make a ceramic slip formulation;
- and
- (e) preparing a ceramic green body from said slip formulation.
10 more elements
A process comprising:
- (a) forming a hydrolyzable solution comprising an alcohol from about 80 to about 99 percent by weight of said hydrolyzable solution, a first group of alkoxides and a second group of alkoxides, said groups of alkoxides combined being from about 1 percent to about 20 percent by weight of said hydrolyzable solution with said first group of alkoxides comprising at least one compound characterized as A(OR).sub.x,
- wherein A is at least one metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, Ge, Pb, Sb and Bi,
- and said second group of alkoxides comprising at least one compound characterized as B(OR).sub.x,
- wherein B is at least one metal selected from the group consisting of Ti, Zr, Sc, Y, La, Nb, Fe, Ta, W, Mn, Sn, Mg, and Zn, and
- wherein R is a compound characterized as C.sub.y H.sub.z wherein y is an integer from 1 to 10,
- z is an integer selected from the group consisting of 2y, 2y+1 and 2y-1, and
- x is an integer from 1 to 7,
- such that said first and second groups of alkoxides suitable to be hydrolyzed to form a compound characterized as ABO.sub.3,
- (b) hydrolyzing said hydrolyzable solution to form a hydrolyzed dispersion of said compound characterized as ABO.sub.3 in an alcohol;
- (c) substantially concentrating said dispersion to a sediment;
- (d) admixing a binder from about 0.1 percent to about 5 percent by weight of said hydrolyzed dispersion dissolved in a binder solvent from about 1 percent to about 6 percent by weight of said hydrolyzed dispersion, a plasticizer from about 0.01 percent to about 5 percent by weight of said hydrolyzed dispersion, and a release agent from about 0.01 percent to about 5 percent by weight of said hydrolyzed dispersion with said sediment to make a ceramic slip formulation;
- and
- (e) preparing a ceramic green body from said slip formulation.
10 more elements
Dependencies are inferred from the claim text.