CH4-sensing and high-temperature mechanical properties of porous CaZrO3/MgO composites with three-dimensional network structure

Uniformly open-porous CaZrO3/MgO composites were prepared by pressureless r eactive sintering of CaMg (CO3)(2) and ZrO2 with 0.5 mass% LiF additive, an d their gas sensing properties to CH4 were investigated at 700-900 degreesC . At > 800 degreesC, the porous composites showed rapid responses (similar to1 min) to 1000 ppm CH4 with sensitivities (R-0/R) of similar to1.7. In ad dition, the fracture strength (of) of the porous composites was kept consta nt up to 1300 degreesC (sigma (f) similar to 35 MPa for porosity of 47%), w hich demonstrated their high structural stability. The results suggest the feasibility of the porous composites as multi-functional filter materials, i.e., simultaneous hot gas-filtering and gas-sensing in one component.