4- Sketches are given below for Mgo-graphite brick cross section. Considering the anisotropic property of the graphite crystal, write and explain which Case is better the in terms of materials properties (density, slag corrosion, compressive strength, thermal cond. thermal expansion) for refractory materials ? (20p) Case A) Graphite flakes are perpendicular Case B) Graphite flakes are parallel to pressing direction to the pressing direction Graphite flakes Graphite Makes pressing direction 1 pressing direction 4- Sketches are given below for Mgo-graphite brick cross section. Considering the anisotropic property of the graphite crystal, write and explain which Case is better the in terms of materials properties (density, slag corrosion, compressive strength, thermal cond. thermal expansion) for refractory materials ? (20p) Case A) Graphite flakes are perpendicular Case B) Graphite flakes are parallel to pressing direction to the pressing direction Graphite flakes Graphite Makes pressing direction 1 pressing direction