Effect of hot isostatically pressed sintering on microstructure of translucent alumina compact

Promdej, Chutinan; Pavarajarn, Varong; Wada, Satoshi; Wasanapiarnpong, Thanakorn; Charinpanitkul, Tawatchai

doi:10.1016/j.cap.2008.09.011

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…The slip casting is known as one of the ceramic methods for producing corundum ceramics [9]. Various pressing technologies such as isostatic and magnetic-pulse pressing were applied to com-pact powdered materials [10][11][12]. However, the features of these methods include the difficulty to obtain uniform density and the presence of internal stresses in the material [13].…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders

2021

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The electrophoretic deposition (EPD) of coatings and bulk compacts in a wide range of thicknesses (from 23 to 1800 μm) from stable suspensions of a magnesium-doped aluminum oxide nanopowder with subsequent sintering of samples into dense ceramics was studied. The initial nanopowder was obtained by the method of electric explosion of an Al-Mg alloy wire with a Mg content of 1.3 wt. %. The study of the dispersion composition, kinetics of deaggregation under the ultrasonic treatment and zeta potential in the nanopowder-based suspensions was carried out. It was shown that a nearly linear increase in the deposited mass and thickness of EPD deposits occurred at a constant voltage of 20 V and an average deposition current of approximately 40 μA when the deposition time was varied from 1 to 180 min. Drying of the coatings with a thickness of less than 35 μm led to the formation of a net of small cracks, while drying of the bulk compacts with a thickness of more than 1 mm occurred without cracking. The ceramic bulk sample with a thickness of 1.2 mm and the density of 98.7% TD was successfully obtained by sintering at 1650 °C for 4 h. It was characterized by a dense grain structure with an average grain size of 5 μm and the presence of a small number of closed pores less than 1 μm in size. Sintering of ceramics was revealed to be accompanied by the formation of a MgAl2O4 crystalline spinel phase, localized mainly at grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders

2021

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“…Alumina is used in the fabrication of thin-film coatings via pulsed laser deposition [4,5], chemical vapor deposition [6,7], and the sol-gel process [8]. Alumina powders are compacted using isostatic and magnetic pulse methods [9][10][11] and slip casting [12,13]. Means of uniaxial and isostatic compaction have major drawbacks and call for expensive equipment.…”

Section: Introductionmentioning

confidence: 99%

Formation of Bulk Alumina Ceramics by Electrophoretic Deposition from Nanoparticle Suspensions

Калинина

Rusakova

Kaigorodov

et al. 2021

Russ. J. Phys. Chem.

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“…The alumina with low porosity (<0.05%) and small grain size (<1 μm) microstructure exhibits high transparency . As many researchers reported, hot isostatic pressing (HIP) and spark plasma sintering (SPS) methods are promising routes for preparing transparent ceramic because of their low sintering temperature and high applied pressure. Wang et al .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Transparent Alumina by Rapid Vacuum Pressureless Sintering Technology

Zhang

Zhao

et al. 2012

J. Am. Ceram. Soc.

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Transparent alumina with high transmission has been first successfully prepared by rapid vacuum pressureless sintering processing at lower sintering temperature and reduced soaking time, compared with conventional pressureless sintering. The alumina sintered at 1670°C for 5 min has a residual porosity of 0.002% and a real in-line transmission of 64% for a wavelength of 1100 nm. We show that soaking time has an effect on the densification and transparency of alumina sintered at 1650°C. With increasing sintering temperature and soaking time, densification and grain growth occurred, and above 20 min, grain size increases slowly. The real in-line transmission of alumina increased with the densification and decreased with pore size growth. The light transmission and absorption were greatly affected by the grain size and pore defects.

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Effect of hot isostatically pressed sintering on microstructure of translucent alumina compact

Cited by 9 publications

References 22 publications

Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders

Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders

Formation of Bulk Alumina Ceramics by Electrophoretic Deposition from Nanoparticle Suspensions

Fabrication of Transparent Alumina by Rapid Vacuum Pressureless Sintering Technology

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