Results 181 to 190 of about 8,938 (232)

Interfacial Chemistry of Mullite-Mullite Composites

2008
Interfacial chemistry of mullite fiber reinforced-mullite matrix composites was examined using SEM/EDX and scanning AES. All the fibers bond strongly to the matrix and exhibit no sliding during afiber push-in test. Ex­cess Si over AI is found at the fiber-matrix interfaces. AES results show the carbon -layer is nonuniform and in some cases less than 30
Ori Yeheskel, Mari Lou Balmer, David C. Cranmer   +2 more
openaire   +1 more source

Coprecipitation-derived mullite and mullite-zirconia composites

Journal of Materials Science, 1991
Precursor powders of mullite-zirconia (0–40 wt% ZrO2) were prepared by a hydroxide coprecipitation method and their behaviour during calcination between room temperature and 1500 °C was studied using thermal analysis, X-ray diffraction and electron microscopy.
S. Rajendran, H. J. Rossell
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Mullite precursor phases

Journal of the European Ceramic Society, 1993
Abstract Admixtures of tetraethoxysilane (TEOS) and aluminium sec.-butylate (AlOBu) with stoichiometric 3Al2O3.2SiO2 mullite composition were used for the syntheses. Depending on the amount of H2O, the velocity of the hydrolysis process and the pH of the solvent, three different types of temperature-induced mullite formation processes are observed ...
Schneider, H., Saruhan, B., Voll, D., Merwin, L., Sebald, A.   +4 more
openaire   +2 more sources

Reactive Coating of Zircon on Mullite and Mullite—Alumina Substrates

Journal of the American Ceramic Society, 1997
A stable zirconia coating of 20–30 pm thickness on a mullite substrate with a different alumina/silica ratio was obtained by reactive coating of zircon. It is shown that the Al 2 O 3 / SiO 2 ratio of the mullite ...
Maria A. Sainz, Angel Caballero, Jos S. Moya   +2 more
openaire   +1 more source

Diffusion bonding of ceramics: mullite, ZrO2-toughened mullite

Journal of Materials Science, 1991
Diffusion bonding of fine-grained mullite and ZrO2-toughened mullite was performed in the temperature range from 1500 to 1550 °C in air. Uniaxial pressure was applied at high temperature during the bonding process. The surface roughness to be bonded (Rmax) was about 3 μm. Bonding strength was measured by four-point bending tests and the strength of the
Takayuki NAGANO, Hidezumi KATO, Fumihiro WAKAI   +2 more
openaire   +1 more source

Fine milling of fused mullite and mullite-corundum

Refractories, 1981
Milling time during the fine grinding of fused mullite and mullite-corundum powders in a vibromill instead of a ballmill can be reduced by a factor of five. The addition of sulfite lye or ethyl silicate in amounts of 0.1% reduces by a factor of 12–18 the vibromilling time, but iron pickup is increased. Grinding in a jet mill causes the specific surface
V. A. Ustichenko, V. S. Shapovalov
openaire   +1 more source

Porous mullite templated from hard mullite beads

Journal of the European Ceramic Society, 2011
Abstract Porous mullite bodies were developed by spark plasma sintering (SPS) amorphous mullite beads of about ∼30 μm in diameter at two temperatures, 950 and 1300 °C. Materials showed a close random stacking of solid spheres that retained their original packing but slightly flattened at the contacts in some cases.
E. Garcia, M.I. Osendi, P. Miranzo
openaire   +1 more source

Fiber-coatings for fiber-reinforced mullite/mullite composites

Le Journal de Physique IV, 2001
Mullite-based fiber-reinforced composites are favorite candidates for the application in combustion chambers of gas turbines. The application requires damage tolerance, temperature and oxidation-resistance at high temperatures (>1200°C) over long terms. In order to realize crack deflection and fiber pull-out, an interphase coating of the mullite fibers
K. Nubian, G. Wahl, B. Saruhan, H. Schneider   +3 more
openaire   +1 more source

Mechanical behaviour of mullite composites reinforced with mullite fibres

Materials Science and Engineering: A, 1995
Abstract Mullite matrix composites uniaxially reinforced with uncoated and BN (0.3 or 1 μm thick) coated mullite fibres were consolidated to 82 to 98% of TD (theoretical density) at 1300 °C by using a colloidal processing route to make mullite matrix.
J.-S. Ha, K.K. Chawla
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Tape Casting and Properties of Mullite and Zirconia–Mullite Ceramics

Journal of the American Ceramic Society, 1991
Mullite and ZrO 2 ‐mullite ceramics have been prepared by tape casting mixtures of Al 2 O 3 , quartz, and ZrO 2 powders and subsequent reaction sintering. Tape casting leads
Phillippe Boch, Thierry Chartier
openaire   +1 more source