Mechanical Properties of Borosilicate Glass Coated with Two-layered Ceramics by Sputtering

Hoshide, Toshihiko; Otomo, Takafumi

doi:10.1007/s11665-007-9152-x

Cited by 2 publications

(2 citation statements)

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“…Previous studies have shown that sputtered ceramic coatings can be applied to metallic or ceramic substrates to increase their mechanical and physical properties, and potentially the useful lifespan of these materials [5][6][7]. Hoshide and Akamatsu [6] looked at the effect of RF magnetron sputtered *Corresponding author: Department of General Dentistry, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas 78229, USA.…”

Section: Introductionmentioning

confidence: 99%

“…email: teixeirae@uthscsa.edu alumina coatings (5-10 mm thick) on the strength of a borosilicate glass, reporting increases in the strength of the materials. Hoshide and Otomo also evaluated borosilicate glass coated with two-layer ceramic laminates using the same methodology [7]. Alumina (Al 2 O 3 ) of 99.99 per cent purity and silicon carbide (SiC) of 99.8 per cent purity were adopted in their study as deposition (sputter target) materials, and they reported that the strength of the glass substrate was improved by the ceramic coating [7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Zirconia–parylene multilayer thin films for enhanced fracture resistance of dental ceramics

Teixeira

Piascik

Stoner

et al. 2009

Proc Inst Mech Eng H

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Recent research has shown that the application of specific thin films can enhance the material properties of a laminate construct. In this study, the effect of different mono/multilayered films on the strength of a ceramic specimen is demonstrated. It is well established that cracks can initiate and/or propagate from the internal surfaces of all-ceramic dental restorations. Modifying that surface by thin-film deposition might help increase clinical longevity and applicability. Specimens were divided into the following groups according to different surface treatments received: uncoated (control group), 10 microm yttria-stabilized zirconia (YSZ) thin film, 10 microm parylene thin film, 9.75 microm YSZ + 0.25 microm parylene film, and a multilayered film (five layers of 1.25 microm YSZ + 0.75 microm parylene). Depositions were performed using a radio-frequency magnetron sputter system (working pressure 15 mT, 150 degrees C, 30:1 Ar/O2 gas ratio) to produce the YSZ layers, and a vapour deposition process was used to produce the parylene layers. Flexural strength measurements were carried out by three-point bending (span = 10 mm) in a servo-electric material testing system in deioinized (DI) water (37 degrees C). The results showed that the strength of the specimen significantly increased with the deposition of all types of coating, showing the greatest increase with the multilayered film (approximately 32 per cent). It is hypothesized that a multilayer thin film (brittle/ductile) can promote crack deflection, causing strength enhancement of the brittle construct.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Zirconia–parylene multilayer thin films for enhanced fracture resistance of dental ceramics

Teixeira

Piascik

Stoner

et al. 2009

Proc Inst Mech Eng H

View full text Add to dashboard Cite

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Fatigue Properties of Borosilicate Glass Coated with Two-Layered Ceramic Thin Films

Hoshide

Tanaka

Tsujiai

2012

J. of Materi Eng and Perform

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The long-term durability of ceramics coated glass with high performance should be appropriately evaluated prior to their applications. Fatigue properties of such materials should be clarified to ensure the long-term durability. In this work, a borosilicate glass was coated with single-and two-layered ceramic thin films by a sputtering method. Fatigue tests of coated glass were conducted under bending mode, and fatigue properties of coated glass were investigated. It was revealed that the fatigue life of glass coated with two-layered film became longer compared with those of glass substrate and glass coated single-layered film. Hardness as surface characteristics of coated films, and bending strength as bulk property of coated glass were correlated with the average fatigue life, though no good correlation was found between them. Fatigue resistance strength was proposed as another strength parameter. It was found that the average fatigue life was adequately expressed by a power function of fatigue resistance strength.static strength and fatigue tests were conducted under bending mode, instead of axial loading tests. Fatigue life distributions for various thicknesses of coated ceramic film were statistically discussed. It is convenient that fatigue characteristics obtained by long-time tests can be evaluated by using static strength properties given in short-time tests. In this work, the average fatigue life was correlated with some static strength parameters, and resultant correlations were discussed. Finally, a new strength parameter, "fatigue resistance strength," was proposed to get a better correlation with the average fatigue life. Experimental Procedures Material processingA commercial borosilicate glass was used as a substrate material. The geometry of glass substrate was a disk type with a diameter of 100mm and a thickness of 2mm. An oxide ceramics Al2O3 of 99.99% purity and a carbide ceramics SiC of 99.8% purity were selected as target materials. In the present work, Al2O3 or SiC film of single-layer was coated by sputtering procedure as mentioned below. Glass coated with single-layered ceramic film for tests to get static strength properties was prepared so that the film thickness tf of single-layered ceramics should be 1µm, 3µm or 5µm. In addition, glass coated with two-layered ceramic film was also produced for static and fatigue tests. In coating two-layered films, Al2O3 film was first coated on the substrate glass, and afterward SiC film was coated on Al2O3-coated glass. This layer order of coating films has an advantage in tribological aspect because SiC is harder than Al2O3. In two-layer coated glass, the thickness tf of Al2O3 film as the first layer was set to be 3µm, and SiC film in the second layer was coated to be 1µm, 3µm or 5µm in its thickness.An RF magnetron sputtering apparatus of upper deposit type was used in the coating process. The distance between substrate and target material was fixed to be 40mm in this apparatus. Substrate and target materials were being water-cooled during the proc...

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Mechanical Properties of Borosilicate Glass Coated with Two-layered Ceramics by Sputtering

Cited by 2 publications

References 10 publications

Zirconia–parylene multilayer thin films for enhanced fracture resistance of dental ceramics

Zirconia–parylene multilayer thin films for enhanced fracture resistance of dental ceramics

Fatigue Properties of Borosilicate Glass Coated with Two-Layered Ceramic Thin Films

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