| 摘要 |
PURPOSE:To prevent deposition of carbon and generation of reducing gas in the case of mixing a binder in sand and producing a molding sand by compounding a specific amt. of an oxidizing agent with the sand and the binder. CONSTITUTION:>=0.3 part oxidizing agent is compounded with 100 parts sand (based on weight) in casting mold which is produced by mixing a binder with the sand. The compounding ratio of the binder and the oxidizing agent is usually preferably >=0.3 part oxidizing agent with 1 part binder. The representative oxidizing agent is nitrate, chlorate and peroxide, among which nitrate is more preferable. The binder may be org. or inorg. A phenolic resin is more preferable. |
