Processing and mechanical properties of laminated composites of mullite/woven fabrics of SiTiCO fibers

Hirata, Yoshihiro; Matsuda, Manabu; Takeshima, Kumiko; Yamashita, Ryoko; Shibuya, Masaki; Schmücker, Martin; Schneider, Hartmut

doi:10.1016/0955-2219(96)82836-6

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…M ULLITE (3Al 2 O 3 ⅐2SiO 2 ) is an often-studied material, because of its high melting point (1830°C), low coefficient of thermal expansion (CTE ϭ 4.4 ϫ 10 Ϫ6 -5 ϫ 10 Ϫ6 /°C), low thermal conductivity, high chemical stability, high thermal shock resistance, and excellent creep resistance. [1][2][3][4][5][6][7][8][9] All these factors contribute to good high-temperature mechanical properties, especially in composites where mullite serves as the matrix material. 4 For example, SiC-fiber-reinforced mullite composites offer bend strengths of 800 MPa and toughnesses of 29 MPa⅐m 0.5 , in comparison with values of 330 MPa and 1-2 MPa⅐m 0.5 for monolithic mullite.…”

Section: Introductionmentioning

confidence: 99%

“…4 For example, SiC-fiber-reinforced mullite composites offer bend strengths of 800 MPa and toughnesses of 29 MPa⅐m 0.5 , in comparison with values of 330 MPa and 1-2 MPa⅐m 0.5 for monolithic mullite. 4,5 The low thermal conductivity, low density, and low CTE of mullite make it useful for optical applications, e.g., as mid-infrared (3-5 m) windows. 6,8 Its low dielectric constant (6 -6.7), coupled with a smaller CTE mismatch to silicon (4.4 ϫ 10 Ϫ6 -5 ϫ 10 Ϫ6 /°C) than Al 2 O 3 (7.2 ϫ 10 Ϫ6 -8.8 ϫ 10 Ϫ6 /°C) also make it a valuable material for use in microelectronics packaging and substrates.…”

Section: Introductionmentioning

confidence: 99%

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Flame Spray Pyrolysis of Precursors as a Route to Nano‐mullite Powder: Powder Characterization and Sintering Behavior

Baranwal

Villar

Garcı́a

et al. 2001

Journal of the American Ceramic Society

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The flame spray pyrolysis of alcohol-soluble precursors allows the synthesis of mullite-composition nanopowders (average size of ϳ60 -100 nm) that, when annealed carefully, provide processable nano-mullite powders. The powders have been characterized using several spectroscopic and microscopy methods, including thermal gravimetric analysis, differential thermal analysis, diffuse reflectance infrared Fourier transform spectroscopy, and transmission electron microscopy. Preliminary studies on the pressureless-sintering behavior of these powders are presented. Without additives or any efforts to optimize the process, powder compacts could be sintered to relative densities of >90%, with grain sizes of <500 nm at 1600°C.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flame Spray Pyrolysis of Precursors as a Route to Nano‐mullite Powder: Powder Characterization and Sintering Behavior

Baranwal

Villar

Garcı́a

et al. 2001

Journal of the American Ceramic Society

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“…Typically, two fibre mats were sandwiched between layers of the soda-lime glass matrix powder in a die (24 mm diameter) to form the green bodies (see Figure 2). Similar laminated composites, but containing woven fabrics of Si-Ti-C-O fibres sandwiched between thin mullite layers have been reported also [31 ]. Uniaxial pressures of 90 MPa were employed to obtain samples of sufficient strength to be handled.…”

Section: (Ii) Forming Of Green Bodies and Composite Consolidationmentioning

confidence: 98%

Fabrication of woven metal fibre reinforced glass matrix composites

1997

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Abstract. A processing route has been developed for the fabrication of metallic fibre mat reinforced glass matrix composites. For the model experiments reported here, a commercially available satin woven stainless steel 316L fibre mat was used as the reinforcement and soda-lime glass as the matrix. The process involves two steps: (1) the infiltration of the intra-and inter-tows regions of the fibre mats with silica sol using electrophoretic deposition and (2) the fabrication of a composite by cold uniaxiat pressing and pressureless sintering of impregnated fibre mats sandwiched between layers of the matrix glass powder. The sintering took place in air at 670 ~ and composite materials of sufficient integrity could be obtained without damaging the fibres. The deposited silica remained amorphous at the processing temperature providing a porous interface between the glass matrix and the metallic reinforcement. Observation of fracture surfaces revealed that both fibre pull-out and fibre deformation occur, which should lead to a significant toughness enhancement. The presence of the interfacial silica layer, deposited using electrophoresis, is thought to be responsible for this behaviour.

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“…R & D work on oxidic CMCs with a porous matrix are accomplished mainly in the United States (University of Santa Barbara CA, General Electric, COI), in Japan (Kagoshima University), and in Germany (DLR, Cologne) [25,26] .…”

Section: Three -Dimensional Woven Structuresmentioning

confidence: 99%