Chemically bonded sand systems are an important part of foundry technology and their interactions at the mold-steel interface are of great interest. With today’s emphasis on near-net-shape steel castings and more stringent dimensional requirements, there is a need to characterize as-cast surface quality. Part I of this two-part paper focused on surface quality at uncoated as-cast steel/chemically bonded sand interfaces. The results of Part I suggest that refractory coating (wash) technologies may be required. Therefore, Part II focuses on studying the effects of refractory coating, metal, and chemically bonded sand system on as-cast surface quality. Refractory coatings, designed for steel castings, were applied to disk-shaped specimens by four industrial partners using normal production techniques. A small and practical casting trial, using disk-shaped specimen cores, was developed at Western Michigan University. This trial allows several core specimens to be wetted simultaneously from a known head pressure, temperature, and steel alloy. The casting trials were conducted at Saginaw Valley State University. The results show that various combinations of refractory coatings and chemically bonded sand systems provide different as-cast surface quality. Also, a new refractory coating technology (sol–gel) may provide a superior as-cast surface quality with silica and ceramic sands in a steel casting. Traditional refractory coatings, while still better than no coating, performed worse. Finally, the refractory coatings can affect the shakeout/collapsibility of a chemically bonded sand system. Overall, this indicates that more engineering of these coatings may be required for steel.

化学结合砂系统是铸造技术的重要组成部分，它们在模具-钢界面上的相互作用引起了人们极大的兴趣。随着当今对近净形钢铸件的重视和更严格的尺寸要求，需要表征铸态表面质量。这篇由两部分组成的论文的第一部分侧重于未涂层铸钢/化学结合砂界面的表面质量。第一部分的结果表明，可能需要耐火涂层（清洗）技术。因此，第二部分重点研究耐火涂层、金属和化学结合砂系统对铸态表面质量的影响。四个工业合作伙伴使用正常生产技术将耐火涂层设计为钢铸件，应用于圆盘形试样。一个小而实用的铸造试验，使用圆盘形样品芯，是在西密歇根大学开发的。该试验允许从已知的压头压力，温度和钢合金同时润湿多个岩心样本。铸造试验在萨吉诺谷州立大学进行。结果表明，耐火涂层和化学结合砂系统的各种组合提供了不同的铸态表面质量。此外，一种新的耐火涂层技术（溶胶-凝胶）可以为钢铸件中的硅砂和陶瓷砂提供卓越的铸态表面质量。传统的耐火涂料虽然仍然比没有涂料好，但表现更差。最后，耐火涂层会影响化学结合砂系统的落砂/塌陷性。总的来说，这表明钢可能需要对这些涂层进行更多的工程设计。