Forming method for glass and glass-ceramic

A glass-ceramic and quartz glass-ceramic technology, which is applied in the field of mold preparation and lens matrix preparation, can solve the problems of inability to produce, small size, and high production cost of quartz molds, and achieves simplified production methods, easy polishing, high temperature resistance, etc. receptive effect

Inactive Publication Date: 2004-05-12
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] On the other hand, it is not possible to produce large-sized sintered ceramic molds with the necessary molding precision and precision (eg, no holes)
[0012] However, quartz molds are expensive to produce and limited to smaller sizes

Method used

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  • Forming method for glass and glass-ceramic
  • Forming method for glass and glass-ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0122]The fused base glass contains the following ingredients (% by weight):

[0123] SiO 2 55.50

[0124] Al 2 o 3 25.30

[0125] P 2 o 5 7.90

[0126] Li 2 O 3.70

[0127] Na 2 O 0.50

[0128] MgO 1.00

[0129] ZnO 1.40

[0130] TiO 2 2.30

[0131] ZrO 2 1.90

[0132] As 2 o 3 0.50

[0133] The base glass may be comparable in composition to the applicant's commercially available glass-ceramic Zerodur(R). The base glass produced in this way is refined and cast into gobs of blank glass, which are subsequently vitrified using a controlled crystallization process through a temperature program. For this reason, start heating to 730°C at a heating rate of 0.1K / min, and keep it warm for 24 hours, then heat it to 850°C at a heating rate of 0.1K / min, and then keep it for 48 hours, and then slowly at a speed of 0.1K / min Cool to...

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Abstract

Production of a mold for hot deformation of glass or glass ceramics comprises producing the mold as a glass ceramic mold from a starting glass by casting and converting into a keatite glass ceramic with a predominant keatite mixed crystal phase by heat treatment. Independent claims are also included for the following: (1) process for molding glass or glass ceramic; (2) mold produced by the above method; and (3) molded body made from a glass or glass ceramic.

Description

technical field [0001] The present invention relates to a method of forming glasses and glass ceramics, especially for the production of lens substrates, in which a blank is sunk under the action of gravity into a mold to produce a shaped body. [0002] The invention further relates to a suitable mold preparation method. Background technique [0003] German patent DE 199 38 811 A1 discloses a method for forming glass-ceramic components, according to which the blank is sagged under the influence of infrared radiation while possibly applying a vacuum or overpressure. [0004] This molding method is suitable for forming a large number of three-dimensional blanks. Thus, if grooved or grooved parts can be produced, the cross-section of such parts can be circle segments, rectangles, rhomboids or other shapes. [0005] The precision of the parts produced therefrom naturally depends on the precision of the molds used. So far, only series-produced components have been produced acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/02C03B19/02C03B23/00C03B23/025C03B23/035C03B32/02C03B40/00C03C10/00C03C10/12C03C10/14
CPCC03B23/0357C03B23/0252C03B32/02C03C10/0027C03B40/00C03B23/025G21K1/06C03B19/02G21K1/067G21K2201/064G21K2201/067
Inventor 索尔斯滕·德林拉尔夫·叶达姆兹克豪克·埃塞曼埃娃·赫尔策尔
Owner SCHOTT AG
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