Pore size control of Al2O3 ceramics using two-step sintering

Isobe, Toshihiro; Ooyama, Asami; Shimizu, M.; Nakajima, Akira

doi:10.1016/j.ceramint.2011.08.005

Cited by 29 publications

(9 citation statements)

References 27 publications

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“…After performing a comparison of the grain sizes in Al 2 O 3 -ZrO 2 (Y 2 O 3 ) ceramics after conventional sintering [14] and grain sizes in 0.50Al 2 O 3 -0.50ZrO 2 (Y 2 O 3 ) ceramics after two stage sintering, it was found that the sizes of the grains in 0.50Al 2 O 3 -0.50ZrO 2 (Y 2 O 3 ) ceramics after two-stage sintering were smaller than in ceramics from conventional sintering. This result agreed with previously published works [7,18,19]. The main reason for the application of two-stage sintering is suppression of grain growth in the final stage sintering by application of the second, low temperature, heating step.…”

Section: Resultssupporting

confidence: 95%

Influence of yttria additives on structural, microstructural and mechanical properties of alumina–zirconia composites prepared by two-stage sintering

Rittidech

Suekwamsue

2015

Ceramics International

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Section: Resultssupporting

confidence: 95%

Influence of yttria additives on structural, microstructural and mechanical properties of alumina–zirconia composites prepared by two-stage sintering

Rittidech

Suekwamsue

2015

Ceramics International

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“…The reason for this difficulty is that densification and grain growth are both driven by diffusive mechanisms, which results in the simultaneous activation of densification and grain growth1112. Two-step sintering (TSS) is a promising approach for simultaneously obtaining high density and nano-grains13. Lukić et al14 applied TSS to sinter HAP powder, which was conducted in a tube furnace.…”

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confidence: 99%

A novel two-step sintering for nano-hydroxyapatite scaffolds for bone tissue engineering

Feng

Niu

Gao

et al. 2014

Sci Rep

134

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In this study, nano-hydroxyapatite scaffolds with high mechanical strength and an interconnected porous structure were prepared using NTSS for the first time. The first step was performed using a laser characterized by the rapid heating to skip the surface diffusion and to obtain the driving force for grain boundary diffusion. Additionally, the interconnected porous structure was achieved by SLS. The second step consisted of isothermal heating in a furnace at a lower temperature (T2) than that of the laser beam to further increase the density and to suppress grain growth by exploiting the difference in kinetics between grain-boundary diffusion and grain-boundary migration. The results indicated that the mechanical properties first increased and then decreased as T2 was increased from 1050 to 1250°C. The optimal fracture toughness, compressive strength and stiffness were 1.69 MPam1/2, 18.68 MPa and 245.79 MPa, respectively. At the optimal point, the T2 was 1100°C, the grain size was 60 nm and the relative density was 97.6%. The decrease in mechanical properties was due to the growth of grains and the decomposition of HAP. The cytocompatibility test results indicated that cells adhered and spread well on the scaffolds. A bone-like apatite layer formed, indicating good bioactivity.

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“…Moreover, rough pore wall surfaces are frequently observed in the micrographs, indicating a high specific surface area facilitating water adsorption on the pore wall (following the penetration and inhibition of water in the open pores). Precise preparation of porous ceramics having various pore size and enhanced porosity with two-step sintering program from Al 2 O 3 powder compact were also reported from other researchers [31]. From a technological point view, such microstructures may be of interest for porous ceramic applications.…”

Section: Resultsmentioning

confidence: 52%

Sintering lignite fly and bottom ashes via two-step versus conventional process

Karayannis¹,

Moutsatsou²,

Katsika³

2016

SCI SINTER

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Lignite combustion class-C (highly-calcareous) fly ash and bottom ash were sintered employing two-step sintering (TSS) and compared to conventionally sintered ones. TSS sintering is a new promising approach mainly used to obtain effectively densified ceramics. This alternative process is generally characterized by the absence of the final stage of grain growth occurring upon conventional sintering and by the development of nanograin microstructure. The ceramic microstructures successfully obtained in the present research were characterized by means of X-ray diffraction and scanning electron microscopy coupled with energy dispersive X-ray analysis as well as by density measurements. The effectiveness of the solidification process was thoroughly studied, and the specific microstructural features attained are compared between each other and evaluated in relation to the sintering method applied. The results show that the valorization of lignite calcareous ashes into ceramic materials is feasible through different sintering techniques.

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Pore size control of Al2O3 ceramics using two-step sintering

Cited by 29 publications

References 27 publications

Influence of yttria additives on structural, microstructural and mechanical properties of alumina–zirconia composites prepared by two-stage sintering

Influence of yttria additives on structural, microstructural and mechanical properties of alumina–zirconia composites prepared by two-stage sintering

A novel two-step sintering for nano-hydroxyapatite scaffolds for bone tissue engineering

Sintering lignite fly and bottom ashes via two-step versus conventional process

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