Environmental barrier

US11390532B2 · kind B2 · utility

Assignee

• SAINT-GOBAIN CENTRE DE RECHERCHES ET D'ETUDES EUROPEEN · FR

Inventors

• Alain Allimant · Caumont-sur-Durance, FR
• Howard Wallar · Shrewsbury, US

Key dates

• Filing date: Jan 31, 2019
• Grant date: Jul 19, 2022
• Expiry date: Feb 12, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/9669
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A powder formed of fused particles. More than 95% by number of the feed particles exhibiting a circularity of greater than or equal to 0.85. The powder contains more than 88% of a silicate of one or more elements chosen from Zr, Hf, Y, Ce, Sc, In, La, Gd, Nd, Sm, Dy, Er, Yb, Eu, Pr, Ho and Ta, less than 10% of a dopant, as percentage by weight based on the oxides. The powder has a median particle size D50 of less than 15 μm, a 90 percentile particle size, D90, of less than 30 μm, and a size dispersion index (D90-D10)/D10 of less than 2. The powder has a relative density of greater than 90%. The Dn percentiles of the powder are the particle sizes corresponding to the percentages, by number, of n %, on the cumulative distribution curve of the size of the particles of the powder. The particle sizes are classified in increasing order.