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The feasibility of joining porous alumina (Al₂O₃) bodies to monolithic Al₂O₃ using Ag‐CuO and Ag‐V₂O₅ alloys via reactive air brazing (RAB) was examined for a nanoporous filter application. Brazing for these systems is complicated by the conflicting requirements of satisfactory wetting to fill the braze gap, while minimising the infiltration of the porous body. By varying the firing time, temperature, and initial powder size, porous bodies with a range of pore microstructures were fabricated. The wettability was evaluated via sessile drop testing on monolithic substrates and porous body infiltration. Porous Al₂O₃/monolithic Al₂O₃ brazed samples were fabricated, and the microstructures were evaluated. Both systems exhibited satisfactory wetting for brazing, but two unique types of brazing behavior were observed. In the Ag‐CuO system, the braze alloy infiltrated a short distance into the porous body. For these systems …