This paper investigates the direct reaction between aluminum and silica (Al-SiO_2) or aluminum and silicon oxycarbide (AlSiOC) as a potential approach for joining alumina. A polymer blend containing polycarbosilane and polymethylphenylsiloxane was suitable for the surface modification of alumina to yield silicon oxycarbide. In the case of a reaction between Al and SiO_2, the joining layer was transformed to uniform alumina silicate and the average bending strength was ~177 MPa. In the case of Al-SiOC, a transformation into two different types of joining layer could be achieved. One was a metal-silicon layer whose average bending strength was ~252 MPa, while the other was a carbon-substance layer whose average bending strength was ~58 MPa. The metal-silicon layer was obtained by the completion of the reduction reaction between the metallic Al and the SiOC layer, and the carbon-substance layer was obtained as a by-product of the abovementioned reduction reaction.
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