Abstract: A refractory tile system is provided that includes a plurality of tiles adapted for assembly to cover the wall of the boiler. Each tile includes a main body has a front surface and a back surface and includes silicon carbide and a metallic phase including silicon. Each tile also includes an engagement structure with an engagement void for receiving a complementary stud structure extending from the wall of the boiler. Each tile also includes a void plane defined by a plurality of points within the engagement void that are closest to the front surface, and a hot face plane parallel to the void plane defined by a plurality of points on the front surface closest to the void plane, and Ds?0.25 Ta, where Ds is the shortest distance between the void plane and the hot face plane and Ta is the average thickness of the main body.