Ceramic heat-insulating layers with club-structure

US6063435A · kind A · utility

Assignee

• DLR Deutsches Zentrum für Luft- und Raumfahrt e.V. · DE

Inventors

• Uwe Schulz · Neunkirchen, DE
• Claus Kroder · Sankt Augustin, DE
• Jorg Brien · Wuppertal, DE
• Hartmut Schurmann · Neunkirchen, DE
• Klaus Fritscher · Cologne, DE

Key dates

• Filing date: Apr 10, 1998
• Grant date: May 16, 2000
• Expiry date: Apr 10, 2018

Classification

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

Abstract

The present invention relates to a process for vapor-depositing zirconium dioxide on ceramic or metallic substrates, and the heat-insulating layers obtainable by such process. In particular, the invention relates to a process for vapor-depositing zirconium dioxide, optionally doped with rare-earth metal oxides or mixtures of such oxides, on ceramic or metallic substrates in a range of substrate temperatures of from 600 to 1550.degree. C. while the substrate is continuously rotated at a speed in the range of from 1 to 300 rpm, characterized in that, following the nucleation phase, the rotational speed and the temperature are adjusted to a range defined by the equations: ##EQU1## where T represents the substrate temperature in .degree. K, and .omega. represents the rotational speed of the substrate in rpm, wherein the rotational speed is varied continuously or discontinuously, or alternatively in alternating senses of rotation.