Effects of particle classification on colloidal processing of mullite

Hirata, Yoshihiro; Takeshima, Kumiko

doi:10.1016/0167-577x(93)90157-s

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…In colloidal processing it is essential to control the particle size and stability of the particles against settling, which determine the rheological properties of the suspensions and therefore, on the properties of the green bodies and the sintered compacts. [8][9][10] The aim of the present work was to study the stability and rheological properties of mullite powders synthesized by a combustion method using colloidal silica in excess of 20 mol% over the stoichiometric ratio and using two different combustion aids, i.e. ammonium nitrate and hydrogen peroxide.…”

Section: Introductionmentioning

confidence: 99%

Colloidal behaviour of mullite powders produced by combustion synthesis

Burgos-Montes

Moreno

2007

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Colloidal behaviour of mullite powders produced by combustion synthesis

Burgos-Montes

Moreno

2007

Journal of the European Ceramic Society

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“…The properties of mullite filler infiltrated in the Si-Ti-C-O fabric were as follows : chemical composition (mass%)-71.46 Al 2 O 3 , 28.13 SiO 2 , 0.30 ZrO 2 , 0.10 TiO 2 , 0.01 Na 2 O, cumulative particle size distribution (µm)-0.7 (10%)-1.7 (50%)-3.8 (90%). An electrosterically stabilized aqueous mullite suspension of 40 vol% solids at pH 8.5, was prepared by adding polyacrylicammonium (average molecular weight, 10000) of 0.65 mass%, against the mass of mullite [8]. The 13 sheets of a woven fabric of Si-Ti-C-O fibers, 270 µm thick, 20 mm wide, and 90 mm long were laminated together in the mullite suspension.…”

Section: Preparation Of Laminated Porous Compositementioning

confidence: 99%

Comparison of Tensile Fracture Behavior between Si-Ti-C-O Fiber Bundle (Yarn), Woven Fabric of Yarn and Laminated Composite of the Si-Ti-C-O Fabric / Mullite Filler / Polytitanocarbosilane System

Maeda

Hirata

Sugimoto³

et al. 2005

KEM

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A polytitanocarbosilane (20-30 mass%)-xylene solution was infiltrated into a porous laminated composite with 35-40 vol% Si-Ti-C-O fabric of 11 diameter fiber and 15-25 vol% mullite filler, and decomposed at 1000°C in an Ar atmosphere. This polymer impregnation and pyrolysis method was repeated 8 times to produce the composites of 76-82 % theoretical density. The yarn (662-765 filament / yarn), fabric and composite provided the following average strengths : 1240 MPa for the yarn; 768 MPa for the fabric; 117 MPa for the composite. The fracture probability of the yarn, fabric and composite was well fitted by the normal distribution function. The tensile strength of the composite was interpreted by the product of the effective fiber content, the Young's modulus of the fiber and elongation of the composite.

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“…The pH of the suspension was adjusted to 8.5 using an NH 4 OH solution to enhance the dispersion of the negatively charged mullite particles by electrosteric stabilization with PAA. 53 The suspensions were stirred for 24 h at room temperature, after which ultrasonic vibration at 20 kHz was applied for 5 min to disperse the particle agglomerates. Air bubbles in the suspension were eliminated using a vacuum pump.…”

Section: (1) Green Laminated Compositementioning

confidence: 99%

Preparation of Silicon‐Titanium‐Carbon‐Oxygen Fabric/ Mullite Filler/Polytitanocarbosilane Laminates by Polymer Impregnation and Pyrolysis Method

Hirata

Hayata

Maeda

et al. 2004

Journal of the American Ceramic Society

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A polytitanocarbosilane (PTC, 20–50 mass%)–xylene solution was infiltrated into a porous, laminated woven fabric of 21–33 vol% Si‐Ti‐C‐O fibers including 26–46 vol% mullite powder (filler) and decomposed at 1000°C in an argon atmosphere. This polymer impregnation and pyrolysis method (PIP) was repeated eight times to produce a laminated composite of 68%–85% of theoretical density. The effects of the polymer concentration and the fraction of mullite filler on the densification rate and microstructure of the layered composite were studied. The pseudoductility of the densified composite, as measured using four‐point flexural testing, was caused by buckling after the elastic deformation and was followed by delamination along the direction of the layered fabric. The strength and the energy of fracture were enhanced by controlling the incorporation of mullite filler in the filament yarn (formation of a narrow pore‐size distribution) and densification with a low‐viscosity PTC solution. The composite with a higher strength provided a higher energy of fracture. The maximum energy of fracture reached 22 kJ/m2 in the composite with 330 MPa of strength in four‐point flexure.

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Effects of particle classification on colloidal processing of mullite

Cited by 7 publications

References 11 publications

Colloidal behaviour of mullite powders produced by combustion synthesis

Colloidal behaviour of mullite powders produced by combustion synthesis

Comparison of Tensile Fracture Behavior between Si-Ti-C-O Fiber Bundle (Yarn), Woven Fabric of Yarn and Laminated Composite of the Si-Ti-C-O Fabric / Mullite Filler / Polytitanocarbosilane System

Preparation of Silicon‐Titanium‐Carbon‐Oxygen Fabric/ Mullite Filler/Polytitanocarbosilane Laminates by Polymer Impregnation and Pyrolysis Method

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