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Coatings for glass shaping molds and molds comprising the same

A glass mold and coating technology, applied in glass pressing, glass forming, coating and other directions, can solve the problem of unsuitable surface finish of coating

Active Publication Date: 2018-03-27
ENTEGRIS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, the surface finish of glass handling drop guides and coatings thereon is not suitable for precision glass molding required for applications such as consumer electronic devices, medical devices, optical devices, etc.

Method used

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  • Coatings for glass shaping molds and molds comprising the same
  • Coatings for glass shaping molds and molds comprising the same
  • Coatings for glass shaping molds and molds comprising the same

Examples

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Effect test

example 1

[0079] One and five micron average particle size graphite test pieces measuring 0.25 inches (0.635 cm) thick and 2 inches by 2 inches (5.08 cm by 5.08 cm) were heat-sealed (sealed with pyrolytic carbon coating) and coated with 400 to 500 nm Thick yttrium oxide coating. The one micron average particle size samples were run at 800°C for two 30 minutes, and the five micron average particle size samples were run at 800°C for one 60 minute cycle. Gravimetric measurements were taken before and after each heat treatment and are given in Table 1 below. The weight loss after 60 minutes was the same for the 1 and 5 micron samples. The bottom sample in each case had less weight loss than the top sample because it had less exposure. Both samples exhibited delamination of the yttrium oxide coating. The one-micron samples were more severe, which may be attributed to the additional thermal cycling. Simulations were performed with molding samples of potassium ion-exchanged aluminosilicate...

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Abstract

Precision glass molds are described, which are formed by coating a mold made from high purity, fine grain sized graphite, with a coating including titanium. In various implementations, the titanium coating is overcoated with yttria (Y203) to provide a high precision glass mold of superior performance character. The resultant glass molds can be used to form glass articles having a highly smooth finish, for high precision applications such as consumer electronic device applications, medical instruments, and optical devices. The use of high purity, fine grain size graphite allows molds to be machined at low cost, thereby eliminating the need to fabricate a metal mold that must be coated with multiple layers including metal diffusion barrier layers to meet operational requirements for such precision applications.

Description

[0001] Cross References to Related Applications [0002] This application is asserted under 35 USC 119 filed on July 10, 2015 in the name of Troy Scoggins and Rex Gerald Sheppard as "by US Provisional Patent Application No. 62 / 191,018 for PRECISION GLASS MOLDS MADE FROM COATEDGRAPHITE MOLD BODIES. The disclosure of US Provisional Patent Application No. 62 / 191,018 in its entirety is hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to coatings for glass-shaping molds and glass-shaping molds comprising such coatings, as well as methods of making and using such molds. Background technique [0004] Graphite is used in glassmaking equipment for glass bending and other glass forming operations because glass does not adhere to graphite and graphite is easy to process. However, despite such advantages, graphite is subject to oxidation at the temperatures at which glass bending or other forming operations are performed. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B40/00C04B41/89C04B41/00C04B35/52C04B41/50C04B41/51C04B41/52
CPCC03B40/00C04B41/52C04B41/89C04B41/009C04B35/522C04B41/4529C04B41/5061C04B41/5133C04B41/5041C04B41/5045C03B11/06C03B2215/05C03B2215/11C03B2215/12C03B2215/16C03B2215/31C03B2215/32C23C14/0635C23C14/08C23C16/06C23C16/32C23C16/40C23C16/45525
Inventor T·史考金斯R·G·谢佩德
Owner ENTEGRIS INC