Method of coating an article, paste and plug for preventing hole blockage during coating

US11203693B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Jianzhi ZHAO · Shanghai, CN
• Zhida Pan · Shanghai, CN
• Cem Murat Eminoglu · Simpsonville, US
• Canan Uslu Hardwicke · Greenville, US
• Liming Zhang · Hangzhou City, CN
• Lei Cao · 龙王头村, CN
• Wenqing Peng · Shanghai, CN

Key dates

• Filing date: Sep 15, 2017
• Grant date: Dec 21, 2021
• Expiry date: Apr 22, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/60
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method includes masking at least one hole of an article with a paste, wherein the hole opens onto a surface of the article, applying a coating to the surface of the article, and removing the paste including contacting the paste with water, leaving at least one open hole in the surface of the coated article. The paste includes about 40-80 wt % of a filler material, about 0.5-20 wt % of an inorganic binder, about 0.5-15 wt % of a polyhydroxy compound and about 5-25 wt % of water. The filler material includes a first material which includes alkali metal doped alumina, zirconium oxide, titanium oxide, silicon dioxide, or a combination thereof and a second material which includes a silicate. A weight ratio between the first and second materials is in a range of about 1-10.