Surface Modification of Silicon Nitride Powder with Aluminum

Han, Kyoung Ran; Lim, Chang Sup; Hong, Mee-Jeong; Choi, S. K.; Kwon, Soon‐Hyung

doi:10.1111/j.1151-2916.1996.tb08174.x

Cited by 17 publications

(5 citation statements)

References 9 publications

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“…From the viewpoint of colloidal processing, multicomponents could be distributed evenly when they possess similar surface properties. Successful surface modification of silicon nitride powder with aluminum or other colloidal sintering agent proved more homogeneity in the green compacts compared with that of conventionally prepared samples. In this paper, we attempt to coat the surface of CNTs with alumina, which will not only improve the homogeneous distribution of CNTs in the ceramic matrix, but also make the binding between two phases more tight after sintering.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Processing of Carbon Nanotube/Alumina Composites

2002

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Preparation of carbon nanotube (CNT)/alumina composites by a simple colloidal processing method has been reported in this paper. The surface modification process of carbon nanotubes was characterized by means of zeta potential measurements and TEM microscopy. The addition of only 0.1 wt % carbon nanotubes in the alumina composite increases the fracture toughness from 3.7 to 4.9 MPa·m1/2. Microstructure characterization, performed by SEM, showed that the bridging effect on cracks, the tight bonding between CNTs and alumina matrix, and the pullout of CNTs from matrix are possible mechanisms leading to the improvement of the fracture toughness.

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Section: Introductionmentioning

confidence: 99%

Colloidal Processing of Carbon Nanotube/Alumina Composites

2002

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“…In one method, the Si 3 N 4 powder is coated with an oxide layer (such as SiO 2 or Al 2 O 3 ); thus, the powder behaves in a manner similar to such oxides, for which dispersion and consolidation behavior have been well studied and are well understood. [2][3][4][5][6] In the other method, Si 3 N 4 powder dispersions are stabilized by selecting the proper dispersants, which react with Si 3 N 4 surface groups in a controlled manner.…”

Section: Introductionmentioning

confidence: 99%

Systematic Approach for Dispersion of Silicon Nitride Powder in Organic Media: II, Dispersion of the Powder

Wang

Sigmund

Aldinger

2000

Journal of the American Ceramic Society

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A novel dispersant-O-(2-aminopropyl)-O-(2-methoxyethyl)-polypropylene glycol (AMPG)-was developed to disperse submicrometer-sized Si 3 N 4 powder in nonaqueous media, based on the surface chemistry of the powder. The dispersing phenomena and mechanisms have been studied systematically, both in model systems (using atomic force microscopy and ellipsometry) and in powder systems (using rheological behavior and adsorption isotherms). The results from the model systems correlated well with those from wet powder systems. It is demonstrated that highly concentrated (with a solids volume fraction of >0.50) and colloidally stable nonaqueous Si 3 N 4 suspensions can be realized using AMPG.

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“…The addition of a few drops of the Al sol to a thick ␥-alumina slurry resulted in a slip with low viscosity; a similar phenomenon was observed for Si 3 N 4 when the Al sol was added to a thick Si 3 N 4 slurry, where a coating layer of Al 2 O 3 was observed on a Si 3 N 4 particle via TEM. 18 The Al sol seemed to coat the surface of the ␥-alumina grains and act as a dispersant. The phase transformation of the Al sol occurs at 1081°C, which is a temperature at which ␥-alumina does not transform to ␣-alumina.…”

Section: Resultsmentioning

confidence: 99%

Preparation Method of Submicrometer‐Sized α‐Alumina by Surface Modification of γ‐Alumina with Alumina Sol

Han

Lim

Hong

et al. 2000

Journal of the American Ceramic Society

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A method is introduced to prepare almost-spherical submicrometer-sized ␣-alumina via surface modification of ␥-alumina with an alumina sol. Milled ␥-alumina, in the presence of 3 wt% of ␣-alumina with a median particle size (d 50 ) of 0.32 m (AKP-30), produced irregularly shaped ␣-alumina with d 50 Ϸ 0.3 m after heat treatment at 1100°C for 1 h. ␥-alumina that had been surface-modified by milling in the presence of 3 wt% of the alumina sol resulted in almostmonosized, spherical ␣-alumina ϳ0.3 m in size after heat treatment at 1100°C for 1 h. Furthermore, almost-spherical ␣-alumina 0.1-0.2 m in size was obtained by milling ␥-alumina with 3 wt% of AKP-30 alumina in the presence of 3 wt% of the alumina sol, followed by heat treatment at 1100°C for 1 h. The alumina sol that has been introduced in this work seems to act as a dispersant, in addition to helping to form a spherical shape.

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Surface Modification of Silicon Nitride Powder with Aluminum

Cited by 17 publications

References 9 publications

Colloidal Processing of Carbon Nanotube/Alumina Composites

Colloidal Processing of Carbon Nanotube/Alumina Composites

Systematic Approach for Dispersion of Silicon Nitride Powder in Organic Media: II, Dispersion of the Powder

Preparation Method of Submicrometer‐Sized α‐Alumina by Surface Modification of γ‐Alumina with Alumina Sol

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