Method of reducing porosity in thermal spray coated and sintered articles
This invention relates to an article having a reduced porosity and a method for sealing porosity of at least a portion of an outer porous surface of an article, said method comprising (i) applying a sealant solution on the outer porous surface of said article, (ii) infiltrating at least a portion of the outer porous surface with said sealant solution, and (iii) allowing the infiltrated sealant solution to react, thereby forming an infiltrated solid precipitate, said infiltrated solid precipitate sealing the porosity of at least a portion of the outer porous surface of said article. The method is useful, for example, in the protection of integrated circuit manufacturing equipment, internal chamber components, and electrostatic chuck manufacture.
1. An article having an outer porous surface in which at least a portion of said outer porous surface is sealed with a sealant comprising the reaction product of a metal salt and a base to form an infiltrated solid precipitate having a porosity of not greater than about 5.0%, wherein the infiltrated solid precipitate comprises yttrium hydroxy nitrate, cerium hydroxy nitrate or lanthanum hydroxy nitrate.
2. The article of claim 1 wherein the metal salt is selected from yttrium nitrate, cerium nitrate or lanthanum nitrate and the base is selected from ammonium hydroxide, potassium hydroxide or sodium hydroxide.
3. The article of claim 1 , comprising a sintered article or a metallic article with a thermally sprayed coating that is coated onto the outer porous surface of the article.
4. The article of claim 1 comprising a chamber or a component of said chamber used in the production of an integrated circuit component.
5. The article of claim 1 which comprises a sintered article or a thermally sprayed coating that is coated on the outer porous surface of the article.
6. The article of claim 5 , wherein the thermally spray coated article is selected from the group consisting of yttrium oxide, zirconium oxide, magnesium oxide, cerium oxide, aluminum oxide, and oxides of Group 2A to 8B inclusive of the Periodic Table and the Lanthanide elements.
7. The article of claim 1 further comprising a thermally sprayed coating of nanoparticles or slurries bonded to the sealant, the sealant sealing the porosity of at least a portion of the outer porous surface of said article.