Paper Title:
Diamond Machinable Sol-Gel Silica Based Hybrid Coatings for High Precision Optical Molds
  Abstract

The demand for high precision optical elements as micro lens arrays for displays increases continually. Economic mass production of such optical elements is done by replication with high precision optical molds. A new approach for manufacturing such molds was realized by diamond machinable and wear resistant sol-gel coatings. Crack free silica based hybrid coatings from base catalyzed sols from tetraethylorthosilicate (TEOS: Si(OC2H5)4) and methyltriethoxysilane (MTES: Si(CH3)(OC2H5)3) precursors were deposited onto pre-machined steel molds by spin coating process followed by a heat treatment at temperatures up to 800°C. Crack-free multilayer coatings with a total thickness of up to 18 µm were achieved. Micro-machining of these coatings was accomplished by high precision fly cutting with diamond tools. Molds with micro-structured coatings were successfully tested for injection molding of PMMA optical components. The wear resistance of the coatings was successfully tested by injection molding of 1000 PMMA lenses. Hardness and elastic modulus of the coatings were measured by nano indentation. The chemical composition was measured by X-ray photo electron spectroscopy (XPS) as a function of the sol-gel processing parameters.

  Info
Periodical
Edited by
M. Merklein, F.-W. Bach, K.-D. Bouzakis, B. Denkena, M. Geiger and H.-K. Toenshoff
Pages
65-72
DOI
10.4028/www.scientific.net/KEM.438.65
Citation
A. Mehner, J. A. Dong, T. Hoja, T. Prenzel, Y. Mutlugünes, E. Brinksmeier, D. Lucca, F. Klaiber, "Diamond Machinable Sol-Gel Silica Based Hybrid Coatings for High Precision Optical Molds", Key Engineering Materials, Vol. 438, pp. 65-72, 2010
Online since
May 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hong Yi Li, Yun Han Ling, Xing Jun Jiang, Xin De Bai
Abstract:TiO2 is one kind of semiconductor-based photocatalyst. TiO2 shows relatively high reactivity and chemical stability under ultraviolet (UV)...
819
Authors: Li Gou, Ji Lei Zhu, Jun Guo Ran, Suang Feng Yan
Abstract:In order to improve the adhesion between diamond coatings and cemented tungsten carbide (WC-Co) substrates, the diamond coatings were...
1889
Authors: Nurot Panich, Surasak Surinphong, D.A. Karpov, Yong Kwang Tan, Chin Foo Goh, Jan Ma
Abstract:The aim of this work is to fabricate and develop the innovative ceramic coatings for protection applications with both high hardness and...
81
Authors: Hsi Hsin Chien, Kung Jeng Ma, Chien Hung Kuo
Chapter 3: Mechanical Engineering and Manufacturing
Abstract:Glass molding process provides a great potential for the production of precise glass optical components at low cost. The platinum-iridium...
533
Authors: Han Lee, Jiunn Der Liao, Minh Hien Ngo Thi, Yu Hui Lin, Pei Lin Shao, Chih Kai Yao, Yang Der Juang
Chapter 5: Bio- and Eco Materials
Abstract:In this research, sol-gel method was utilized to prepare ceramic coating on medical grade 316 L stainless steel with different annealing...
423