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- W2792392550 abstract "A novel forming method for preparing Si3N4 foams by DCC method via dispersant reaction combined with protein-gelling was proposed. Si3N4 foams were fabricated through temperature-induced hydrolysis of sodium tripolyphosphate (STPP) dispersant and simultaneous thermal gelling of ovalbumin binder at elevated temperature above 75 °C, with subsequent pressureless sintering at 1700 °C for 2 h. Stable Si3N4 suspension of 35 vol% solid loading with 0.5–2.0 wt% ovalbumin addition was obtained by adding 0.2 wt% STPP at alkaline region and room temperature. The controlled coagulation of the suspension could be realized after treating at 75 °C for around 1 h. Homogeneous composition distribution of Y and Al elements in EDS result indicated the uniform dispersion of sintering additives in green bodies, which was beneficial for the liquid phase sintering at high temperature. Typical spherical pore structure ranging from 110 to 320 μm formed due to the ovalbumin foaming capability and elongated β-Si3N4 crystalline grains generally over 3 μm were observed in sintered Si3N4 ceramic foams. Finally, Si3N4 ceramic foams with porosities ranging from 65.5 ± 1.5% to 80.8 ± 1.0% and compressive strength from 9.7 ± 0.9 MPa to 17.5 ± 1.2 MPa were obtained. The result indicated that the novel preparation approach in combination with DCC method and protein-gelling could be a convenient and environmentally friendly route to prepare various ceramic foams with high porosity and excellent material homogeneity." @default.
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- W2792392550 date "2018-05-01" @default.
- W2792392550 modified "2023-10-15" @default.
- W2792392550 title "Preparation of Si3N4 foams by DCC method via dispersant reaction combined with protein-gelling" @default.
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- W2792392550 doi "https://doi.org/10.1016/j.jallcom.2018.02.238" @default.
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