Ceramic powders coated with a nanoparticle layer and process for obtaining thereof
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C04B-041/45
C01G-003/02
C01G-009/02
C01G-023/047
C04B-035/628
C04B-035/634
C04B-041/00
C04B-041/85
C09C-001/36
C09C-001/40
C09C-003/06
출원번호
US-0120036
(2008-10-13)
등록번호
US-9512043
(2016-12-06)
국제출원번호
PCT/PT2008/000040
(2008-10-13)
§371/§102 date
20110321
(20110321)
국제공개번호
WO2010/059070
(2010-05-27)
발명자
/ 주소
Calado Da Silva, João Manuel
Dos Santos Antunes, Elsa Marisa
출원인 / 주소
INNOVNANO-MATERIAIS AVANCADOS, S.A.
대리인 / 주소
White, John P.
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
Ceramic powders are coated with a layer of nanoparticles of multiple crystalline structures. These coatings can be obtained by means of the introduction of precursors in water in oil emulsions, which upon decomposition during its detonation, form the nanoparticles that adhere to the surface of the c
Ceramic powders are coated with a layer of nanoparticles of multiple crystalline structures. These coatings can be obtained by means of the introduction of precursors in water in oil emulsions, which upon decomposition during its detonation, form the nanoparticles that adhere to the surface of the ceramic powder intended to coat. The later base ceramic powder can be synthesized during the emulsion detonation (W/O) or simply be directly placed in its composition. The properties of the obtained coating, such as thickness, adhesion, porosity and coated surface percentage, can be adjusted.
대표청구항▼
1. Process for preparing a ceramic powder coated with a nanoparticle layer comprising: introducing in a water-in-oil (W/O) emulsion at least a precursor that is either in a solid state or dissolved in the W/O emulsion, and thendetonating the W/O emulsion such that during the detonation stage, the pr
1. Process for preparing a ceramic powder coated with a nanoparticle layer comprising: introducing in a water-in-oil (W/O) emulsion at least a precursor that is either in a solid state or dissolved in the W/O emulsion, and thendetonating the W/O emulsion such that during the detonation stage, the precursor decomposes to synthesize nanoparticles (b), which are deposited on a base ceramic particle (A), forming a coating layer of nanoparticles (b), wherein the base ceramic particle (A) is either synthesized during the W/O emulsion detonation stage or added and homogenized in the W/O emulsion prior to the detonation stage,wherein a detonation temperature of the detonation stage is less than 800° C. 2. The process according to claim 1, wherein the W/O emulsion comprises an internal aqueous phase and an external insoluble phase, wherein the internal aqueous phase and the external insoluble phase are linked under action of a surfactant. 3. The process according to claim 2, wherein the at least a precursor of the nanoparticles (b) is added in the solid state to the W/O emulsion and both the base ceramic particles (A) and the nanoparticles (b) are synthesized during the detonation of the W/O emulsion. 4. The process according to claim 2, wherein the at least a precursor further comprises a precursor of the base ceramic particles (A) and wherein the precursor of the base ceramic particles (A) and the precursor of the nanoparticles (b) have different reaction kinetics during the detonation of the W/O emulsion, wherein the precursor of the base ceramic particles (A) precedes and supports the advance of the shock wave (Taylor zone), and the precursor of the nanoparticles (b) reacts in a subsequent phase of the Taylor zone. 5. The process according to claim 2, wherein the base ceramic particles (A) are added directly to the W/O emulsion and homogenized in the internal phase of the W/O emulsion. 6. The process according to claim 1, wherein the at least a precursor of the nanoparticles (b) is added in the solid state to the W/O emulsion and both the base ceramic particles (A) and the nanoparticles (b) are synthesized during the detonation of the W/O emulsion. 7. The process according to claim 6, wherein the at least a precursor further comprises a precursor of the base ceramic particles (A) and wherein the precursor of the base ceramic particles (A) and the precursor of the nanoparticles (b) have different reaction kinetics during the detonation of the W/O emulsion, wherein the precursor of the base ceramic particles (A) has faster reaction kinetics than the precursor of the nanoparticles (b), and wherein the precursor of the base ceramic particles (A) reacts inside or behind the reaction zone in a zone that precedes and supports the advance of the shock wave (Taylor zone), and the precursor of the nanoparticles (b) reacts in a subsequent phase of the Taylor zone. 8. The process according to claim 1, wherein the at least a precursor further comprises a precursor of the base ceramic particles (A) and wherein the precursor of the base ceramic particles (A) and the precursor of the nanoparticles (b) have different reaction kinetics during the detonation of the W/O emulsion, wherein the precursor of the base ceramic particles (A) has faster reaction kinetics than the precursor of the nanoparticles (b), and wherein the precursor of the base ceramic particles (A) reacts inside or behind the reaction zone in a zone that precedes and supports the advance of the shock wave (Taylor zone), and the precursor of the nanoparticles (b) reacts in a subsequent phase of the Taylor zone. 9. The process according to claim 1, wherein the base ceramic particles (A) are added directly to the W/O emulsion and homogenized in the internal phase of the W/O emulsion. 10. The process according to claim 9, wherein the forming of the coating layer is controlled by the detonation temperature of the W/O emulsion and wherein the detonation temperature of the W/O emulsion is below the decomposition temperature of the base ceramic particle (A) and below the reaction temperature in the solid state between the base ceramic particle (A) and the nanoparticles (b). 11. The process according to claim 9, wherein forming the ceramic powder is controlled by the detonation temperature of the W/O emulsion, and wherein the detonation temperature of the W/O emulsion is higher than the reaction temperature in the solid state between the base ceramic particle (A) and the nanoparticles (b).
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이 특허에 인용된 특허 (2)
Yadav, Tapesh; Pfaffenbach, Karl, Nano-dispersed powders and methods for their manufacture.
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