Effect of temperature and heating rate on the sintering performance of SiC-Al2O3-Dy2O3 and SiC-Al2O3-Yb2O3 systems

Ribeiro, S.; Gênova, Luis A.; Ribeiro, Guilherme Cunha; Oliveira, Marcela Rego de; Bressiani, Ana Helena A.

doi:10.1016/j.ceramint.2017.09.118

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…It is well accepted that the temperature-rise period is very important for the densification of ceramic materials during sintering [20][21][22], and the growing rate of the crystal is accelerated with the proper heating rate. On the other hand, the gas release in sintered samples will become difficult if the heating rate is too high.…”

Section: Heating Ratementioning

confidence: 99%

Sintering mechanism of high-intensity and low-density ceramic proppants prepared by recycling of waste ceramic sands

Chang

Zhu

et al. 2018

Advances in Applied Ceramics

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Waste ceramic sands were effectively used to prepare the high-intensity and low-density ceramic proppants, realising the recycling of the waste ceramic sands. The technology involved the pelletising in an intensive mixer, in which the waste ceramic sands and other starting materials were added, and followed by heat-treatment under different sintering conditions. The sintering temperature, holding time and heating rate were optimised by investigating the crystalline phase, microstructure, density and breakage ratio of the obtained proppants. The results showed that the proppants sintered at 1260°C for 2 h with a heating rate of 5°C min -1 under air atmosphere exhibited high crush resistance and low density, with the breakage ratio of 8.5% under 52 MPa closure pressure and bulk density of 1.65 g cm -3 . The proppants prepared by bauxite, waste ceramic sands and sintering aids are promising candidates as high-intensity and low-density fracturing proppants in future applications.

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Section: Heating Ratementioning

confidence: 99%

Sintering mechanism of high-intensity and low-density ceramic proppants prepared by recycling of waste ceramic sands

Chang

Zhu

et al. 2018

Advances in Applied Ceramics

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“…strength and fracture toughness).Nowadays, silicon carbide (SiC) is a widely used non-oxide ceramic with a global production rate of about 700,000 tons/year. Due to its ultra-high hardness and heat/oxidation resistance, it is employed as an abrasive and raw material for producing parts such as refractory furnaces and heating elements [1][2][3][4][5][6][7][8][9] . SiC has two different crystal structures β-SiC and α-SiC with more than 180 polytypes.…”

mentioning

confidence: 99%

αSiC - βSiC - graphene composites

Razmjoo

Baharvandi

Ehsani

2023

Sci Rep

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In this study, the mechanical properties of the pressureless sintered samples of α-SiC based composite containing 0–3 wt.% graphene and 0–15 wt.% nano β-SiC were investigated. Simultaneous usage of nano β-SiC and graphene and transformation of β-SiC (3C) to α-SiC (6H/4H) resulted in elongation of secondary α-SiC grains, which significantly improved the mechanical properties (e.g. fracture toughness) of SiC ceramics. According to the results, the highest Relative density of 99.04%, Young’s modulus of 537.76 GPa and fracture toughness of 5.73 MPa × m1/2 were obtained in the sample containing 5 wt.% nano β-SiC and 1 wt.% graphene (5B1G). In addition, two methods of measuring bending strength including three-point bending tests and biaxial tests (piston-on-three-ball) were compared. Strip-shaped specimens were prepared for three-point bending test and disc-shaped specimens were prepared for biaxial bending test. Each bending test was evaluated using a universal testing machine. The results showed that the biaxial bending strength is less than the three-point bending strength. Also, the maximum three-point bending strength of 582.01 MPa and biaxial bending of 441.56 MPa were obtained in 5 wt.% Nano β-SiC and 1 wt.% Graphene samples (5B1G). Studies have shown that in addition to the many advantages of using the biaxial bending method, the results have a very similar trend to the three-point bending strength. Also, the most-increased hardnesses of 28.03 GPa and 29.97 GPa were seen in the sample containing 5 wt.% nano β-SiC (5B) with forces of 10 N and 1 N, respectively. One of the effective mechanisms in improving the fracture toughness of α-SiC ceramics is crack deflection/bridging. Also, the difference in thermal expansion of the α-SiC matrix and the reinforcements, leading to the creation of residual stresses between the matrix grains and the reinforcement, is effective in improving the mechanical properties (e.g. strength and fracture toughness).

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B4C-SiC skeleton reinforced graphite composites with excellent mechanical properties

Lin¹,

Zhang²,

Xie³

et al. 2023

J Mater Sci

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Effect of temperature and heating rate on the sintering performance of SiC-Al2O3-Dy2O3 and SiC-Al2O3-Yb2O3 systems

Cited by 9 publications

References 26 publications

Sintering mechanism of high-intensity and low-density ceramic proppants prepared by recycling of waste ceramic sands

Sintering mechanism of high-intensity and low-density ceramic proppants prepared by recycling of waste ceramic sands

αSiC - βSiC - graphene composites

B4C-SiC skeleton reinforced graphite composites with excellent mechanical properties

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