Photoluminescent vitroceramic nanocrystals based on silica-stabilised zirconium, production method thereof and product based on the nanocrystals, for thermal barrier coatings
AssigneeUniversidad Autonoma De Occidente
InventorsCarlos Eduardo CASTANG MONTIEL, Clara Eugenia GOYES LOPEZ, Juan Ricardo VIDAL MEDINA, Lina María GARCIA CRUZ, Javier Arturo JURADO ROSERO
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Abstract
Photoluminescent vitroceramic nanocrystals based on silica-stabilised zirconium; a method for producing same; and a product based on the nanocrystals, for thermal barrier coatings; a method for obtaining the nanocrystals and a product with photoluminescent properties and high-temperature structural stability, for thermal coatings.
Claims8
A process for the preparation of photoluminescent glass ceramic nanocrystals based on silica-stabilized zirconia, characterized by the process comprising the following steps:
- a) preparing a precursor of SiO2 (tetraethoxysilane TEOS);
- b) preparing ZrO2;
- c) mixing products obtained in steps a) and b) to form SiO2—ZrO2;
- d) adding to step c) a mixture of Erbium to a ratio of 1%;
- e) agitating the mixture obtained in step d) for a period of 10 to 20 hours;
- f) depositing the mixture in a platinum crucible-type container for thermal treatment;
- and
- g) thermally treating the mixture in the platinum crucible-type container with a heating profile wherein the temperature)(T°) is increased from room temperature (18 to 25° C.) to 900° C. at a rate of 18 to 20° C./minute.
Photoluminescent glass ceramic nanocrystals based on silica-stabilized zirconia obtained through a process that contains the following steps:
- a) preparing a precursor of SiO2 (tetraethoxysilane TEOS);
- b) preparing the ZrO2;
- c) mixing the products obtained in steps a) and b) to form SiO2—ZrO2;
- d) adding to step c) a mixture of Erbium at a ratio of 1%;
- e) agitating the mixture obtained in step d) for a period of 10 to 20 hours;
- f) depositing the mixture in a platinum crucible type container for thermal treatment;
- g) Thermally treating the mixture from step f) with a heating profile wherein the temperature)(T°) is increased from room temperature (18 to 25° C.) to 900° C. at a rate of 18 to 20° C./minute;
- wherein said nanocrystals are characterized in that the X-ray diffraction pattern thereof presents with bands 2θ at 30.1, 34.6, 35.1, 42.9, 50.1, 50.5, 59.3, 60.0, 73.0, 74.3, 82.2 and 84.9 and where the nanocrystals have sizes between 7.5 and 12.5 nanometers.
A product with photoluminescent properties and structurally stable under high temperature conditions, characterized in that it comprises photoluminescent glass ceramic nanocrystals based on silica-stabilized zirconia, wherein the crystals present an X-ray diffraction pattern with bands 2θ at 30.1, 34.6, 35.1, 42.9, 50.1, 50.5, 59.3, 60.0, 73.0, 74.3, 82.2 and 84.9 and where the nanocrystals have sizes between 7.5 and 12.5 nanometers.
Dependencies are inferred from the claim text.