Effect of Ni content and its particle size on electrical resistivity and flexural strength of porous SiC ceramic sintered at low-temperature using clay additive

Controlling the electrical resistivity of porous silicon carbide ceramics and their applications: A review

“…The room‐temperature electrical resistivity of mullite is reported to be ∼10 13 Ω·cm 152,153 . This is the reason why mullite‐bonded porous SiC with controlled electrical resistivity did not receive much attention until recently 33,34 . Mullite‐bonded α‐SiC‐based composite system 34 with relatively low temperature processing (1200°C), good flexural strength (44 MPa), and room temperature electrical resistivity of 8.6 × 10 –1 Ω.cm was successfully designed by utilising kaolin, graphite, and manganese oxide (Mn 3 O 4 ) as additives.…”

“…Effect of reducing the Ni particle size from 3.5 to 0.3 μm: (A) microstructure formation and (B) interface reactions, with SiC particle size = 4.5 μm and kaolin particle size = 2.1 μm (reproduced with the permission from Ref. [33] 2021 Elsevier)…”

“…[34] 2021 Elsevier). In this system, the electrical resistivity was mainly In a different study, 33 the effects of the Ni content and particle size on the electrical resistivity and flexural strength of mullite-bonded porous SiC were investigated. The schematic diagram of the research work is shown in Figure 7 (reproduced with permission from Ref.…”

“…The schematic diagram of the research work is shown in Figure 7 (reproduced with permission from Ref. [33] 2021 Elsevier). It was found that submicron (0.3 μm) Ni was much more effective than micron-sized Ni (3.5 μm) in terms of reducing the electrical resistivity to a minimum of 2.0 × 10 0 Ω⋅cm and increasing the flexural strength to a maximum of 54 MPa for the samples sintered at 1400 • C.…”

“…[1][2][3][4][5][6][7][8] Porous SiC ceramics with excellent mechanical properties, [9][10][11][12][13][14] high chemical stability, [15][16][17][18][19] good permeability, [20][21][22][23][24] and controllable thermal [25][26][27] and electrical properties [28][29][30] have gained immense attention for both structural and functional applications. Although the practical use of SiC has mostly been limited to structural applications, it has been extensively investigated recently [25][26][27][28][29][30][31][32][33][34][35] for advanced functional applications owing to its semiconductivity.…”