| 摘要 |
THE INVENTION RELATES TO A GLASS AND A GLASS-CERAMIC COMPRISING BETA-QUARTZ AND/OR KEATITE SOLID SOLUTIONS, AND TO A PROCESS FOR THEIR PRODUCTION, AND TO THEIR USE A S SUBSTRATE MATERIAL FOR COATING. GLASS-CERAMIC COMPRISING BETA-QUARTZ AND/OR KEATITE SOLID SOLUTIONS WITH A SURFACE ROUGHNESS WITHOUT POLISHING OF RA < 50 NM, A THERMAL EXPANSION IN THE TEMPERATURE RANGE BETWEEN 20ºC AND 300ºC OF <1.2 . 10-6/K, A TRANSMISSION IN THE NEAR INFRARED REGION AT 1050 NM OF > 85% FOR A 4 NM THICKNESS , AND A COMPOSITION IN % BY WEIGHT , BASED ON THE TOTAL COMPOSITION, CONTAINING: LI2O 3.0-5.5 NA2O 0-2.5 K2O 0-2.0 ∑ NA2O+K2O 0.5-3.0 ∑ MG0+ZNO <0.3 SRO 0-2.0 BAO 0-3.5 B2O3 0-4.0 A12O3 19.0-27.0 SIO2 55.0-66.0 TIO2 1.0-5.5 ZRO2 0-2.5 ∑ TIO2+ZRO2 3.0-6.0 P2O5 0-8.0 FE2O3< 200PPM F 0-0.6 AS SUBSTITUTE FOR O AND IF APPROPRIATE, AT LEAST ONE REFINING AGENT, SUCH AS AS203, SB2O3, CEO2, SULPHATE AND CHLORIDE COMPOUNDS.(FIGURE 1)
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