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Leadless crystal glass

A crystal glass and oxide technology, applied in the field of environmentally friendly crystal glass, can solve the problems of high price and uneconomical, and achieve good stability

Inactive Publication Date: 2008-07-09
襄阳福迪柯光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to achieve the required optical constants for this glass, the expensive Ta 2 o 5 , so it is uneconomical

Method used

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Examples

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Embodiment Construction

[0039] The present invention provides 5 embodiments and 3 comparative examples. Embodiment 1 to embodiment 5, the glass composition (weight percentage) of comparative example a to comparative example c, optical constant refractive index (n d ), dispersion coefficient (v d ), white light transmission (τ), glass specific gravity (ρ) and acid resistance (DA) properties are listed in Table 1.

[0040] Table 1

[0041]

[0042] In order to melt the glasses of Examples 1 to 5 and the glasses of Comparative Examples a to c, various oxides, nitrates, carbonates, etc. used in this type of glass are formulated into batch materials, and according to the melting characteristics of the glass, Add the chemical materials into the platinum crucible at a temperature of 1200°C to 1300°C, stir at a temperature of 1350°C to 1400°C, clarify for 3 to 4 hours, then lower it to a temperature suitable for molding, and pour it into a preheated mold Subsequent annealing forms the glass into a prod...

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Abstract

The invention relates to lead-free crystal glass, which belongs to the technical field of crystal glasses and mainly resolves the problem that the existing crystal glass contains lead and arsenic which can result in pollution to environment and injury to the human body in the process of manufacture, process and use. The invention is mainly characterized in that the components of the invention percentage by weight of oxide comprise: SiO2 holding 40-60%, B2O3 holding 0-5%, Li2O holding 0-5%, Na2O holding 0-10%, K2O holding 5-15%, TiO2 holding 10-20%, ZnO holding 0-5%, ZrO2 holding 0-5%, the oxide holding 3-10%, Al2O3 holding 1.5-5%, CaO holding 0.5-5% and Sb2O3 holding 0-1%. The glass has optical constants of refractive index (nd) within the range of 1.54-1.61 and dispersion coefficient (vd) within the range of 33-46, and has the advantages of perfect chemical stability and comparatively high white light penetration, further the glass is adaptable to mass production in cell furnaces, mainly used in a plurality of fields of decoration, light-fixture, artware and the like.

Description

technical field [0001] The invention belongs to the technical field of crystal glass, and in particular relates to an environmentally friendly crystal glass without lead and arsenic. The glass has a large dispersion value and its refractive index (n d ) in the range of 1.54 to 1.61 and the dispersion coefficient (v d ) in the range of 33 to 46, and has good chemical stability and high white light transmission, and is suitable for large-scale production in pool furnaces. Background technique [0002] Up to now, crystal glass containing lead and arsenic is still used in many fields such as decoration, lighting and handicrafts. However, this kind of glass all causes environmental pollution and personal injury in the process of production, processing and use. As early as many years ago, Japan and the European Union have issued laws and regulations prohibiting the manufacture and processing of lead glass products. The European Union has banned the import of all conventional lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/093C03C3/091C03C3/087C03C3/078
Inventor 邓和平李克炎张卫戎俊华沈义梅
Owner 襄阳福迪柯光电科技有限公司
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