Ultralow expansion titania-silica glass. The glass has high hydroxyl content and optionally include one or more dopants. Representative optional dopants include boron, alkali elements, alkaline earth elements or metals such as Nb, Ta, Al, Mn, Sn Cu and Sn. The glass is prepared by a process that inc
Ultralow expansion titania-silica glass. The glass has high hydroxyl content and optionally include one or more dopants. Representative optional dopants include boron, alkali elements, alkaline earth elements or metals such as Nb, Ta, Al, Mn, Sn Cu and Sn. The glass is prepared by a process that includes steam consolidation to increase the hydroxyl content. The high hydroxyl content or combination of dopant(s) and high hydroxyl content lowers the fictive temperature of the glass to provide a glass having a very low coefficient of thermal expansion (CTE), low fictive temperature (Tf), and low expansivity slope.
대표청구항▼
1. A glass comprising: 9.0 wt % to 16.0 wt % TiO2;84.0 wt % to 91.0 wt % SiO2;900 ppm to 3000 ppm OH; anda combined concentration of 0.1 wt % to 7.0 wt % of one or more dopants selected from the group consisting of B, Al, Li, Na, K, Mg, Ca, Nb, Ta, Mn, Cu and Sn. 2. The glass of claim 1, wherein the
1. A glass comprising: 9.0 wt % to 16.0 wt % TiO2;84.0 wt % to 91.0 wt % SiO2;900 ppm to 3000 ppm OH; anda combined concentration of 0.1 wt % to 7.0 wt % of one or more dopants selected from the group consisting of B, Al, Li, Na, K, Mg, Ca, Nb, Ta, Mn, Cu and Sn. 2. The glass of claim 1, wherein the glass comprises 9.5 wt % to 16.0 wt % TiO2 and 84.0 wt % to 90.5 wt % SiO2. 3. The glass of claim 2, wherein the glass comprises 1000 ppm to 2000 ppm OH. 4. The glass of claim 2, wherein the glass comprises 1150 ppm to 1700 ppm OH. 5. The glass of claim 1, wherein the glass has a fictive temperature of less than 825° C., a crossover temperature between 0° C. and 100° C., an expansivity slope equal to zero at a temperature between 10° C. and 95° C., and an expansivity slope at 20° C. less than 1.2 ppb/K2. 6. The glass of claim 1, wherein the glass has a fictive temperature of less than 750° C., a crossover temperature between 0° C. and 80° C., an expansivity slope equal to zero at a temperature between 10° C. and 60° C., and an expansivity slope at 20° C. less than 0.7 ppb/K2. 7. The glass of claim 1, wherein the glass has a fictive temperature of less than 700° C., a crossover temperature between 0° C. and 60° C., an expansivity slope equal to zero at a temperature between 10° C. and 45° C., and an expansivity slope at 20° C. less than 0.4 ppb/K2. 8. The glass of claim 1, wherein the glass comprises 10.0 wt % to 15.0 wt % TiO2 and 85.0 wt % to 90.0 wt % SiO2. 9. The glass of claim 8, wherein the glass comprises 1000 ppm to 2000 ppm OH. 10. The glass of claim 8, wherein the glass comprises 1150 ppm to 1700 ppm OH. 11. The glass of claim 8, wherein the glass has a fictive temperature of less than 825° C., a crossover temperature between 0° C. and 100° C., an expansivity slope equal to zero at a temperature between 10° C. and 95° C., and an expansivity slope at 20° C. less than 1.2 ppb/K2. 12. The glass of claim 8, wherein the glass has a fictive temperature of less than 750° C., a crossover temperature between 0° C. and 80° C., an expansivity slope equal to zero at a temperature between 10° C. and 60° C., and an expansivity slope at 20° C. less than 0.7 ppb/K2. 13. The glass of claim 8, wherein the glass has a fictive temperature of less than 700° C., a crossover temperature between 0° C. and 60° C., an expansivity slope equal to zero at a temperature between 10° C. and 45° C., and an expansivity slope at 20° C. less than 0.4 ppb/K2. 14. The glass of claim 1, wherein the glass comprises 11.0 wt % to 14.0 wt % TiO2 and 86.0 wt % to 89.0 wt % SiO2. 15. The glass of claim 14, wherein the glass comprises 1000 ppm to 2000 ppm OH. 16. The glass of claim 14, wherein the glass comprises 1150 ppm to 1700 ppm OH. 17. The glass of claim 14, wherein the glass has a fictive temperature of less than 825° C., a crossover temperature between 0° C. and 100° C., an expansivity slope equal to zero at a temperature between 10° C. and 95° C., and an expansivity slope at 20° C. less than 1.2 ppb/K2. 18. The glass of claim 14, wherein the glass has a fictive temperature of less than 750° C., a crossover temperature between 0° C. and 80° C., an expansivity slope equal to zero at a temperature between 10° C. and 60° C., and an expansivity slope at 20° C. less than 0.7 ppb/K2. 19. The glass of claim 14, wherein the glass has a fictive temperature of less than 700° C., a crossover temperature between 0° C. and 60° C., an expansivity slope equal to zero at a temperature between 10° C. and 45° C., and an expansivity slope at 20° C. less than 0.4 ppb/K2.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (8)
Ellison, Adam James Gillmar, Alkali-free glasses containing iron and tin as fining agents.
Koike, Akio; Iwahashi, Yasutomi; Kikugawa, Shinya; Tachibana, Yuko, TiO2-containing silica glass and optical member for EUV lithography using the same.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.