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Demonstration of SiO 2 /SiC‐based protective coating for dental ceramic prostheses
Author(s) -
Chen Zhiting,
Fares Chaker,
Elhassani Randy,
Ren Fan,
Kim Mijin,
Hsu Shu-Min,
Clark Arthur E.,
EsquivelUpshaw Josephine F.
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16525
Subject(s) - refractive index , molar absorptivity , materials science , wavelength , analytical chemistry (journal) , ceramic , chemical vapor deposition , annealing (glass) , optics , composite material , chemistry , optoelectronics , physics , chromatography
SiO 2 /SiC coatings were deposited onto ceramics disks using plasma‐enhanced chemical vapor deposition. The effects of deposition pressure and gas‐flow ratio on the refractive index, extinction coefficient, and SiC composition were studied. For the highest studied SiH 4 to CH 4 gas‐flow ratio of 1.5, the refractive index increased by 17% from 2.53 (at the wavelength of 845 nm) to 2.96 (at the wavelength of 400 nm). For the lowest studied SiH 4 to CH 4 gas‐flow ratio of 0.5, the refractive index only increased by 4% from 2.11 (at the wavelength of 845 nm) to 2.20 (at the wavelength of 400 nm). At higher deposition pressures, the variation in refractive index of the SiC coatings was significantly lower showing a slight increase from 1.93 (at a wavelength of 845 nm) to 1.96 at a wavelength of 400 nm. Except for the case of a low SiH 4 to CH 4 gas‐flow ratio of 0.5, for light with wavelengths ≤650 nm, the extinction coefficient of the SiC coatings increased significantly. Light with a wavelength >650 nm had an extinction coefficient near 0 in all cases. After annealing the sample at 400°C for 4 hours, hydrogen‐related bonds broke and the stress of the film was reduced from −245 to −71 MPa. By utilizing different thicknesses of SiC, the full standard dental shade guide was matched with the ΔE of each coated disk being less than 3.3 compared to the shade guide.