Surface protection of porous ceramic bodies
First Claim
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1. A method for protecting a surface of and increasing the temperature stability of a porous ceramic body, comprising the steps of:
- applying to the surface a slurry composition comprising;
a binding agent;
a ceramic material different from the material of the ceramic body;
at least one boron containing compound;
solvent; and
impregnating the slurry into the pores of the ceramic body wherein the ratio of boron compound to binding agent in the slurry is from 1;
6 to 1;
900, and wherein the method produces a porous ceramic body stable to higher temperatures than a porous ceramic body produced without the at least one boron containing compound.
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Abstract
A porous ceramic body protected by a damage resistant hardened surface, and a method for preparing the surface hardened ceramic body. The ceramic body is protected by applying to the surface a slurry composition containing a binding agent, particles of a ceramic material, at least one boron containing compound, and a solvent. The inclusion of at least one boron containing compound in the slurry provides for hardened surfaces that are stable to higher temperatures as compared to those of the prior art.
35 Citations
25 Claims
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1. A method for protecting a surface of and increasing the temperature stability of a porous ceramic body, comprising the steps of:
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applying to the surface a slurry composition comprising;
a binding agent;
a ceramic material different from the material of the ceramic body;
at least one boron containing compound;
solvent; and
impregnating the slurry into the pores of the ceramic body wherein the ratio of boron compound to binding agent in the slurry is from 1;
6 to 1;
900, and wherein the method produces a porous ceramic body stable to higher temperatures than a porous ceramic body produced without the at least one boron containing compound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for producing a surface protected ceramic body, comprising:
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impregnating a slurry into the pores of a ceramic body; and
drying the slurry in the pores of the ceramic body to produce the surface protected ceramic body;
wherein the slurry comprises a boron-containing compound and further comprises a binding agent, a ceramic material different from the material of the ceramic body, and a solvent, wherein the ratio of boron compound to binding agent in the slurry is from 1;
6 to 1;
900, and wherein the surface protected ceramic body can be healed to 2500°
F. for 20 hours without cracking.- View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of preparing a surface hardened porous ceramic body comprising:
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applying an aqueous slurry comprising boron carbide, silica, and cordierite to the surface of the ceramic body;
impregnating the slurry into the pores of the ceramic;
drying the slurry in the pores of the ceramic body; and
firing the dried slurry in the pores, wherein the ratio of boron carbide to silica in the slurry is from 1;
6 to 1;
900.- View Dependent Claims (24, 25)
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Specification