Improving Crack Resistance of Glass using Atomic Layer Deposition (ALD) by Beneq

Topics Covered

Overview
Invisible Coating on Glass
Higher Crack Resistance with Atomic Layer Deposition
Improvement in Strength with ALD Coating
ALD-Based Strengthened Glass Technology from Beneq

Overview

Beneq Oy, based in Finland, is a supplier of equipment and coating technology for global markets. Beneq turns innovations into success by developing applications and equipment for cleantech and renewable energy fields, especially in glass, solar and emerging thin film markets. Coating applications include optics, barriers and passivation layers, as well as energy generation and conservation. Beneq also offers complete coating services. Beneq's coating applications are based on two enabling nanotechnology platforms: Atomic Layer Deposition (ALD) and aerosol coating (nHALO® and nAERO®).

Strengthened Glass - Beneq ALD for better glass crack resistance

Invisible Coating on Glass

Beneq has developed an invisible coating on glass that increases the damage resistance, literally making it stronger and less prone to breakage upon surface depression. This technology is now available for the glass and display industry.

Higher Crack Resistance with Atomic Layer Deposition

An ALD coating has many properties that makes it suitable for glass crack resistance improvement. It is completely conformal, accurate down to the nanometer scale and free from pinholes. When coating glass with ALD, the resulting thin film covers the top surface, but also the walls of the intrinsic nano-scale cracks. By coating the crack walls, the coating partially or completely fills the original flaws, but also smoothens the crack tip, increasing the tip radius. Basic fracture mechanics proves that an increase in crack tip radius leads to decreased local stress at the tip and this causes an increase in the material’s ability to resist cracking.

Improvement in Strength with ALD Coating

To prove the effect of ALD coating on the crack resistance of glass, Beneq measured the flexural strength of different glasses and glass assemblies. The flexural strength (bending strength) represents the highest stress experienced within the material at its moment of rupture. According to the results, ALD coating has a profound effect on the flexural strength of the tested glasses, at best increasing it by 89%. Preliminary tests carried out on ready-made TFT LCD panels show an increase in flexural strength of up to 40%.

ALD-Based Strengthened Glass Technology from Beneq

Beneq is a leader in ALD coating equipment for industry and demanding applications. We can offer suitable units for research, corporate R&D and full-scale industrial production, depending on the specific needs of our customers. We also provide full coating service possibilities, for development and concept confirmation, as well as small-scale pilot production. Beneq is now offering ALD-based Strengthened Glass technology as a competitive application for glass and display manufacturers.

Source: Beneq

For more information on this source please visit Beneq

Date Added: Jan 14, 2011 | Updated: Jun 11, 2013
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