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Si3N4 porous ceramics with improved mechanical strength were fabricated for the first time by a combined foam-gelcasting and microwave-nitridation method at 1273–1373 K. The Si3N4 porous samples prepared at 1373 K/20 min with the porosity of 68.9% had respectively flexural and compressive strength as high as 8.1 and 20.8 MPa, which values were comparable or even superior to those of Si3N4 porous ceramics...
The porous ceramics were prepared by directly sintering of lead-zinc mine tailings and fly ash as the raw materials without any additional sintering and foaming agent. The effects of fly ash addition on the crystalline phases, pore structure, physical–chemical porosities and mechanical strength were investigated. The results showed that the bulk density decreased firstly and then increased while the...
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