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Heat and light reflective coating on quartz lamp

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专利汇可以提供Heat and light reflective coating on quartz lamp专利检索,专利查询,专利分析的服务。并且A heat and light reflective coating on a fused silica envelope, as on the ends of a quartz arc tube in a metal halide lamp. The coating comprises a mixture of a reflective metal oxide such as zirconium oxide and 20 to 60 percent by weight of a finely ground up glass substantially free of alkali metal, particularly sodium. The coating is fired on at a temperature in the range from 1,100* to 1,200*C sufficient to soften the glass and cause the oxide particles to be bound to each other and to the quartz. The coatings are white, hard and very scratch resistant and able to withstand thermal cycling throughout lamp life.,下面是Heat and light reflective coating on quartz lamp专利的具体信息内容。

1. AN ELECTRIC LAMP COMPRISING A SEALED QUARTZ ENVELOPE CONTAINING RADIATION GENERATING MEANS, AND A HARD, SCRATCH-RESISTANT HEAT AND LIGHT REFLECTIVE COATING ON A PORTION OF THE OUTSIDE THEREOF, SAID COATING COMPRISING A REFLECTIVE METAL OXIDE POWDER HAVING AN INDEX OF REFRACTION GREATER THAN 1.75, AND 20 TO 60 PERCENT BY WEIGHT OF FINELY GROUND UP GLASS SUBSTANTIALLY FREE OF ALKALI METAL, THE GLASS PARTICLES IN SAID COATING HAVING BEEN HEAT-SOFTENED AND RE-FUSED TO CAUSE THE METAL OXIDE PARTICLES TO BE BOUND TO EACH OTHER AND TO THE QUARTZ IN A LIGHTLY SINTERED PARTICULATE COATING.
2. A lamp as in claim 1 wherein said glass has a softening point between 900* and 1,200*C.
3. A lamp as in claim 1 wherein the reflective metal oxide powder is zirconium oxide.
4. A lamp as in claim 1 wherein the glass is composed of approximately 62% SiO2, 17% Al2O3, 19% BaO, 2% CaO and not more than 0.05% alkali.
5. A lamp as in claim 1 wherein the glass is composed of approximately 80.5% SiO2, 1.5% Al2O3, 17% B2O3 and not more than 0.9% alkali.
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