Ceramic nanocomposite material and method of manufacturing thereof
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C04B-035/64
C04B-035/117
C04B-035/119
C04B-035/563
C04B-035/565
C04B-035/584
C04B-035/10
출원번호
US-0456473
(2014-08-11)
등록번호
US-9227877
(2016-01-05)
발명자
/ 주소
Kaplan, Wayne David
Gluzer, Gali
Katz, Moshe
Perlberg, Gil
출원인 / 주소
TECHNION RESEARCH & DEVELOPMENT FOUNDATION LIMITED
대리인 / 주소
Pearl Cohen Zedek Latzer Baratz LLP
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
Ceramic nanocomposites and methods for manufacturing the ceramic nanocomposites are disclosed. One method includes introducing to a fired green ceramic body having a ceramic matrix submicron particles having coefficient of thermal expansion lower than the coefficient of thermal expansion of the cera
Ceramic nanocomposites and methods for manufacturing the ceramic nanocomposites are disclosed. One method includes introducing to a fired green ceramic body having a ceramic matrix submicron particles having coefficient of thermal expansion lower than the coefficient of thermal expansion of the ceramic matrix and at least one type of location-controlling dopant at an amount that is sufficient to cover the majority of the ceramic matrix grain boundaries. One ceramic nanocomposite includes a ceramic matrix with submicron particles dispersed in the ceramic matrix, the submicron particles having a coefficient of thermal expansion lower than the coefficient of thermal expansion of the ceramic matrix and at least one dopant that covers the majority of the ceramic matrix grain boundaries, at a concentration that does not exceed the bulk solubility limit of the dopant in the ceramic matrix at the ceramic nanocomposite sintering temperature.
대표청구항▼
1. A method for manufacturing a ceramic nanocomposite, comprising: receiving a fired green ceramic body comprising a ceramic matrix;introducing to the fired green ceramic body submicron particles having coefficient of thermal expansion lower than the coefficient of thermal expansion of the ceramic m
1. A method for manufacturing a ceramic nanocomposite, comprising: receiving a fired green ceramic body comprising a ceramic matrix;introducing to the fired green ceramic body submicron particles having coefficient of thermal expansion lower than the coefficient of thermal expansion of the ceramic matrix;introducing at least one type of location-controlling dopant at an amount that is sufficient to cover the majority of the ceramic matrix grain boundaries; anddrying the fired green ceramic body after introducing the submicron particles and the location-controlling dopant. 2. The method of claim 1, wherein the amount of the at least one type of location-controlling dopant does not result in a concentration that exceeds the bulk solubility limit of the location-controlling dopant ions in the ceramic matrix, at the ceramic nanocomposite sintering temperature. 3. The method of claim 1, introducing to the fired green ceramic body the submicron particles is done by infiltration of a solution containing compounds that form the submicron particles. 4. The method of claim 1, further comprising sintering the fired green ceramic body after the step of drying the fired green ceramic body. 5. The method of claim 1, wherein the volumetric concentration of the submicron particles is between 0.5 vol. % and 10 vol. %. 6. The method of claim 1, wherein the amount of the at least one type of location-controlling dopant is sufficient to create an intergranular film (IGF) that covers the majority of the ceramic matrix grain boundaries and the majority of the submicron particles. 7. A ceramic nanocomposite comprising: a ceramic matrix with submicron particles dispersed in the ceramic matrix, the submicron particles having a coefficient of thermal expansion lower than the coefficient of thermal expansion of the ceramic matrix; andat least one dopant that covers the majority of the ceramic matrix grain boundaries, at a concentration that does not exceed the bulk solubility limit of the dopant in the ceramic matrix at the ceramic nanocomposite sintering temperature, wherein a majority of the submicron particles are occluded in the ceramic matrix grains. 8. The ceramic nanocomposite of claim 7, wherein the at least one dopant is characterized by its ability to affect the location of the submicron particles within the ceramic matrix during the manufacturing process of the ceramic nanocomposite. 9. The ceramic nanocomposite of claim 7, wherein the at least one dopant is silica (Si) or Calcium (Ca). 10. The ceramic nanocomposite of claim 7, wherein the ceramic matrix is alumina. 11. The ceramic nanocomposite of claim 7, wherein the ceramic matrix is selected from a group of SiC, Si3N4 and B4C, and the at least one dopant is oxygen. 12. The ceramic nanocomposite of claim 7, wherein the submicron particles are selected from W, Mo, SiC, Si3N4, mullite, TiO2, ZrSiO4, TiC, B4C or any combination thereof. 13. The ceramic nanocomposite of claim 7, wherein the at least one dopant being at an amount that is sufficient to cover the majority of the ceramic matrix grain boundaries and the majority of interfaces between the submicron particles and the ceramic matrix grains. 14. The ceramic nanocomposite of claim 7, wherein the at least one dopant being at an amount that is sufficient to create an equilibrium excess of the dopant at the ceramic matrix grain boundaries and at interfaces between the submicron particles and the ceramic matrix grains, without exceeding a bulk solubility limit of the dopant in the ceramic matrix at a ceramic nanocomposite sintering temperature. 15. The ceramic nanocomposite of claim 7, wherein the at least one dopant being at an amount that is sufficient to create an intergranular film that covers the majority of the ceramic matrix grain boundaries and the majority of the submicron particles. 16. The ceramic nanocomposite of claim 7, wherein the intergranular film thickness is between 0.5 and 3 nanometer. 17. An article comprising the ceramic nanocomposite of claim 7. 18. The article of claim 17, wherein the article is a cutting tool, a dental prosthesis, a ceramic armor, a friction component or a medical device. 19. An article comprising a ceramic nanocomposite manufactured according to claim 1. 20. The article of claim 19, wherein the article is a cutting tool, a dental prosthesis, a ceramic armor, a friction component or a medical device.
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이 특허에 인용된 특허 (6)
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