Figure 3 Focuses on a similar region in the copper shaft furnace immediately after two½ decades of operation with the improved silicon carbide bricks (aside from the damaged region in the top segment on the photograph, which was where the common silicon carbide bricks have been used for comparison on https://www.quora.com/profile/Trevor-Flatcher-2/Advantages-and-Challenges-of-Silicon-Carbide-Specialty-Ceramics-Macrocosm-Materials-Company-Overview-Founded-in-2016