Feasibility study on cubic boron nitride coated glass press molds

Kungen Tsutsui, Seiichiro Matsumoto

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Abstract

We report the feasibility of glass press molds using high-quality, thick cubic boron nitride (cBN) films prepared in a plasma jet by chemical vapor deposition. A press test using a cBN film for an optical glass is carried out at a high temperature (650 °C), above the glass transition temperature. Surface morphology, chemical composition, and optical transparency of the glass after a press test are examined by atomic force microscopy, X-ray photoelectron spectroscopy, energy dispersion X-ray spectroscopy, and ultraviolet-visible- near-infrared (UV-VIS-near-IR) and IR spectroscopy. The B and N concentrations at the top several nanometers of the glass increase by several at.% after a press test. This is attributed to diffusion of B and N from the film into the glass. The UV-VIS-near-IR transparency of the glass in a short wavelength range (≤ 900 nm) decreases by several % due to light scattering at the roughened glass surface. In contrast, the IR transparency of the glass remains constant despite an increase in the surface roughness.

Original languageEnglish
Pages (from-to)1415-1418
Number of pages4
JournalDiamond and Related Materials
Volume19
Issue number11
DOIs
Publication statusPublished - Nov 1 2010

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Chemistry(all)

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