Joints between reaction bonded silicon carbide and recrystallized silicon carbide have been prepared by a reaction forming method. The microstructure in the joint area and the fracture morphology were observed by optical microscopy and scanning electron microscopy respectively. The mechanical and electrical properties of the reaction formed joints were evaluated. This study suggested that a good contact interlayer could be formed between the joint and monolithic material by the described method. The flexural strength and electrical resistivity of the silicon/ silicon carbide bulk material were not affected significantly by the presence of the reaction formed joints. It is important to optimize the joining layer microstructure and composition in order to obtaining high performance joints.