Effect of Pore Characteristics in Slip Cast Alumina on Glass Infiltration and Mechanical Properties of the Composites

Bajpai, Preeti; Bhargava, Parag

doi:10.1111/j.1744-7402.2011.02691.x

Cited by 4 publications

(3 citation statements)

References 30 publications

(39 reference statements)

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“…Alumina clay slurry with 26 vol% solid loading (35 wt% alumina HIM30, Hindalco, Hindalco Industries, Mumbai, India, 65 wt% clay, English India Clay, Kerala, India) was made in PVA (SD fine-Chem. Ltd., Mumbai, India, molecular weight 125,000) solution (1 wt%) [38]. Sodium polyacrylate (M-65, Aquapharm Pvt.…”

Section: Methodsmentioning

confidence: 99%

In situ-growth of silica nanowires in ceramic carbon composites

Kumar

Bhargava

2017

Journal of Asian Ceramic Societies

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An understanding of the processing and microstructure of ceramic-carbon composites is critical to development of these composites for applications needing electrically conducting, thermal shock resistant ceramic materials. In the present study green compacts of carbon ceramic composites were prepared either by slurry processing or dry powder blending of one or more of the three-clay, glass, alumina and carbon black or graphite. The dried green compacts were sintered at 1400 • C in flowing argon. The ceramic carbon composites except the ones without clay addition showed formation of silica nanowires. The silica nanowire formation was observed in both samples prepared by slip casting and dry powder compaction containing either carbon black or graphite. TEM micrographs showed presence of carbon at the core of the silica nanowires indicating that carbon served the role of a catalyst. Selected area electron diffraction (SAED) suggested that the silica nanowires are amorphous. Prior studies have reported formation of silica nanowires from silicon, silica, silicon carbide but this is the first report ever on formation of silica nanowires from clay.

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Section: Methodsmentioning

confidence: 99%

In situ-growth of silica nanowires in ceramic carbon composites

Kumar

Bhargava

2017

Journal of Asian Ceramic Societies

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“…Porous alumina preforms were prepared by slip casting followed by sintering at 1200°C for 2 h. The detailed process to prepare the alumina samples and glass composition used for infiltration has been mentioned elsewhere . Earlier experiments carried out on infiltration of porous alumina preforms (CT850, prepared by alumina powder blend having 50:50 wt% of finer ( D 50 ~ 0.7 μm) and coarser alumina ( D 50 ~ 3 μm) powder), with a heating rate of 5°C/min showed poor infiltration and residual glass on the top after infiltration.…”

Section: Methodsmentioning

confidence: 99%

Effect of Heat Treatment Schedules and Glass Powder Particle Size on Glass Infiltration in Porous Alumina Preforms

Bajpai

Bhargava

2013

Int J Applied Ceramic Tech

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Glass infiltrated alumina is one of the popular materials for fabrication of dental prostheses. Achieving complete and uniform glass infiltration is important to achieve desired properties in dental prostheses. This study examined the role of various factors on glass infiltration in sintered porous alumina preforms (porosity ~ 27%). Observations on infiltration in porous alumina samples at a heating rate of 3°C/min at 1100°C for 2 h showed residual glass on the surfaces of the samples indicating incomplete infiltration. Rapid heating of the samples to the peak infiltration temperature by introducing the samples into a preheated furnace resulted in complete infiltration of glass into the samples in <90 min. In addition to heating rate during infiltration, influence of soaking duration and the particle size of glass powder on glass infiltration were also examined.

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“…For the fabrication of glass-infi ltrated ceramics of spinel (MgAl 2 O 4 ), alumina and ceria-stabilised ZrO 2 /Al 2 O 3 nanocomposite, a process involving slip-casting, sintering and infi lling is used (Bajpai and Bhargava, 2012;Della Bona et al ., 2008). Slip-casting is fi rst used to produce a highly porous three-dimensional structure from the aforementioned crystalline materials, which are then sintered at the temperatures appropriate for the chosen crystalline phase to produce a highly stable crystalline network.…”

Section: Techniques For the Fabrication Of Bioinert Ceramic Implantsmentioning

confidence: 99%