Deposition of zirconia sols on woven fibre preforms using a dip-coating technique

Gu, Xiaoxiong; Trusty, P. A.; Butler, E.G.; Ponton, C. B.

doi:10.1016/s0955-2219(99)00206-x

Cited by 31 publications

(24 citation statements)

References 19 publications

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“…Previous work by the authors has shown that the type of zirconia sol used in the coating process is of paramount importance to the success of the technique. Several commercial zirconia sols have been investigated during the development of this technique, but it has been found that only the ZrO 2 sols synthesised hydrothermally from zirconium acetate solution have the desired properties for the successful dip-coating of oxide woven ®bre mats [5]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, the ZrO 2 sol used to coat the ®bres was synthesised by a hydrothermal process, as described previously [5]. Brie¯y, zirconium acetate precursor material (ZrO(CH 3 ±COO) 2 , Mel Chemicals, UK) was processed in an autoclave at 2208C under autogenous pressure for 2 h. The resultant product, which remains after autoclaving is a zirconia sol suspended in an acetic acid solution.…”

Section: Zro 2 Sol Coating Proceduresmentioning

confidence: 99%

“…Fibre coatings, which are essentially an interphase between the ®bre and matrix may also be required in some cases to act as reaction barriers or as a protection to ®bre oxidation [4]. Zirconia, which is known to be chemically inert in combination with certain other oxide materials, is an important ceramic coating materials for high-temperature structural applications [5].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural development of woven mullite fibre-reinforced mullite ceramic matrix composites by infiltration processing

Kaya

Al-Dawery

et al. 2002

Science and Technology of Advanced Materials

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Section: Resultsmentioning

confidence: 99%

Section: Zro 2 Sol Coating Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural development of woven mullite fibre-reinforced mullite ceramic matrix composites by infiltration processing

Kaya

Al-Dawery

et al. 2002

Science and Technology of Advanced Materials

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“…General parameters influencing the formation of bridges during the sol–gel coating of fiber mats are given by Gu et al 8 . Even though it is a common observation that the stiffness of the coated tows increases with precursor liquid concentration, 7,9 up to now no systematic studies on the bridging of fiber tows have been reported because of the lack of measuring techniques 7 …”

Section: Introductionmentioning

confidence: 99%

Continuous Sol–Gel Coating of Ceramic Multifilaments: Evaluation of Fiber Bridging by Three‐Point Bending Test

Krüger

Bockmeyer

Dutschke

et al. 2006

Journal of the American Ceramic Society

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Nextel™ 610 multifilaments were continuously coated with aqueous sols of yttria‐stabilized zirconia (8YSZ). For the transformation of the sol–gel precursor to a crystalline oxide coating detailed microstructural characterization is given. The main subject of the study was the bridging of fibers by interphase material, a general phenomenon of sol–gel coatings. A three‐point bending test is proposed as a semi‐quantitative method to determine the characteristic stiffening of bridged fiber bundles. This method is successfully used to evaluate the influence of sol concentration on fiber bridging and to prove the benefit of additional surfactants to aqueous sols. Differences in film formation on the individual fiber surfaces leading to homogeneous or inhomogeneous film thickness and variation in degree of fiber surface coverage are explained with a three‐fiber model. Based on model and experiment it is shown that even surface coverage and homogeneous film thickness can better be accomplished by multiple coatings from low concentrated sols than by single coatings from high concentrated sols. Finally, the three‐point bending test is used to qualitatively investigate the mechanical properties of the material bridges which can be correlated with results from structural investigations.

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“…Employing a fitting layer, including a continuous or discrete layer, between fiber and matrix has been expected to improve the mechanical performances, 7-8 but the short ceramic fibers, such as alumina or SiC short fibers, are in a cotton-like shape and they cannot be introduced easily into the matrix by conventional powder processing techniques, so in recent years a variety of methods for the coating of individual fibers and for the infiltration of fiber preforms have been developed, including sputtering, chemical vapor deposition (CVD), dip-coating, slurry and sol-gel infiltration, electrostatic attraction and electrophoretic deposition (EPD) techniques. [9][10][11][12][13][14][15][16] On the other hand, a variety of ceramic particles as reinforcement phase have been incorporated in metal matrices by the semisolid mechanical stirring method, which is one of the liquid techniques and has received much attention for the low-cost and simple process. [16][17][18][19] In the present work, the semisolid mechanical stirring method was first used to prepare the coating of discrete aluminum particles on SiC short fibers that were cut from SiC continuous fibers; this technique has not been tried before.…”

Section: Introductionmentioning

confidence: 99%

INVESTIGATION OF THE SEMISOLID MECHANICAL STIRRING METHOD TO DEPOSIT AN ALUMINUM PARTICLE COATING ON THE SURFACE OF SiC SHORT FIBERS

2004

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SiC short fibers, with an average diameter of 13 µm and length of 300-500 µm and chopped from SiC continuous fibers, were surface-modified by the semisolid mechanical stirring method to produce a discrete coating of aluminum particles. The SiC short fibers were introduced into semisolid state aluminum to prepare a slurry by the mechanical stirring method. As all of the short fibers were uniformly dispersed in the slurry, the temperature of the slurry was decreased as quickly as possible, but the slurry continued to be stirred until all of it was converted quickly into a powder-like composite. The surface morphology and axial section of the composite fiber and aluminum particles were examined using a scanning electron microscope (SEM) and an optical microscope; the element analysis of particles on the surface of short fibers in nanometer and submicron sizes was performed by Auger electron spectroscopy (AES). The results indicated that the powder-like composite was a mixture of pure aluminum powder and SiC short composite fiber, the surface of the composite fiber was coated by a discrete single layer of aluminum particles with nanometer, submicron and micron sizes, and the surface coverage of the aluminum particles on the surface of the short fibers ranged from 20 to 30%.

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Deposition of zirconia sols on woven fibre preforms using a dip-coating technique

Cited by 31 publications

References 19 publications

Microstructural development of woven mullite fibre-reinforced mullite ceramic matrix composites by infiltration processing

Microstructural development of woven mullite fibre-reinforced mullite ceramic matrix composites by infiltration processing

Continuous Sol–Gel Coating of Ceramic Multifilaments: Evaluation of Fiber Bridging by Three‐Point Bending Test

INVESTIGATION OF THE SEMISOLID MECHANICAL STIRRING METHOD TO DEPOSIT AN ALUMINUM PARTICLE COATING ON THE SURFACE OF SiC SHORT FIBERS

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