Low-temperature pressureless sintering of Al2O3-SiC-Ni nanocermets in air environment

Firoozbakht, D.; Sajjadi, Seyed Abdolkarim; Beygi, H.; Sazegaran, Hamid

doi:10.1016/j.ceramint.2018.07.023

Cited by 10 publications

(2 citation statements)

References 30 publications

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“…The compression tests were carried out according to aSTm e9 standard using a zwick machine (z250) with the cross speed of 0.5 mm/min. at room temperature [36]. The compression specimens were cut with the wire-cut machine from the sintered steels (length of 18 mm and diameter of 12 mm).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Archives of Metallurgy and Materials

Sazegaran,

Bahari,

Naserian-Nik

et al. 2021

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And mechAnIcAl ProPerTIes of Powder meTAllurgy sTeelsan experimental study was performed to assess the influences of aluminum content on the porosity, microstructure and mechanical properties of powder metallurgy steels. optical microscope equipped with the image processing software and the scanning electron microscope were employed to study the microstructure of investigated specimens. in order to find mechanical properties of specimens, Vickers hardness and compression tests were conducted. By increasing the aluminum content (from 0 to 4 wt. %), the porosity increases (from 6.01% to 8.43%). The microstructure of specimens contains aluminum phase distributed between the boundaries of agglomerated iron particles, ferrite, and pearlite. By increasing the aluminum content, stress-strain curves shift significantly downwards, and the modulus of elasticity, elongation, yield stress, and Vickers hardness reduce from 1.82 to 0.86 gPa, 32.1 to 17.8%, 138.1 to 28.2 mPa, and 127.7 to 26.8 HV, respectively.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Archives of Metallurgy and Materials

Sazegaran,

Bahari,

Naserian-Nik

et al. 2021

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“…Tufail Mustafa et al prepared aluminum oxide nanosheets with a hardness of 19.23 GPa and a strength of 436.43 MPa using graphene oxide as a template using the colloidal method [ 20 ]. Al 2 O 3 -SiC-Ni composites were prepared using low-temperature pressureless sintering by D. Firoozbakht et al The sintering temperature was only 800 °C, the hardness was 56.8 RA, and the strength was 242.5 MPa [ 21 ]. The main components of red mud are metal oxides and minerals, which makes it possible for red mud to be used as a sintering aid for alumina ceramics.…”

Section: Introductionmentioning

confidence: 99%

Wettability and Mechanical Properties of Red Mud–Al2O3 Composites

Chen,

Li,

Jiang

2024

Materials

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In 2023, the global production of new red mud is expected to reach nearly 200 million tons, but less than 10% of it is currently being utilized in an environmentally friendly manner. To reduce the sintering temperature of alumina ceramics, a sintering aid method is used, as high-purity alumina ceramics require a solid-phase sintering temperature of over 1700 °C. The metal oxides present in red mud are necessary components for high-performance composite alumina ceramics. Composites were obtained by mixing and sintering red mud and Al2O3. This study focused on the mechanical properties and wettability of these composites. The results indicated that the 10% red mud–Al2O3 composite exhibited the highest hardness (20.12 GPa) and flexural strength (346 MPa). This is attributed to the formation of a mineral phase dominated by CaAl12O19, generated by the red mud during the sintering process, which filled the pores and reduced porosity. The surface energy of the red mud–Al2O3 composite was the highest at room temperature and high temperature, reaching 49.60 mJ·m−2 and 1164.7 mJ·m−2, respectively, indicating that it has better stability at both room and high temperatures. This study provides an important fundamental basis for the application of red mud–alumina composites to replace alumina-based composites in the field of construction materials, molten metal filters, ceramic cleavers, etc.

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