"浇灌耐火材料" can be translated into English as "casting or pouring refractory materials".
Here, "浇灌" is translated as "casting" or "pouring" depending on the context (if it's about shaping the material by pouring it into a mold, "casting" is more appropriate; if it's simply about pouring the material, "pouring" can be used), and "耐火材料" is translated as "refractory materials," which refers to materials that can withstand high temperatures without melting or deforming.