后处理对磷酸盐干态覆膜砂性能影响及机理分析  

Effect and Mechanism Analysis of Post-Treatment on Properties of Dry Phosphate Coated Sand

作　　者：胡汉基 夏露 张友寿 罗圆圆 HU Han-ji;XIA Lu;ZHANG You-shou;LUO Yuan-yuan(School of Materials and Chemical Engineering,Hubei University of Technology,Wuhan 430068,Hubei,China;Hubei Provincial Key Laboratory of Green Light Industrial Materials,Wuhan 430068,Hubei,China)

机构地区：[1]湖北工业大学材料与化学工程学院,湖北武汉430068 [2]绿色轻工材料湖北省重点实验室,湖北武汉430068

出　　处：《铸造》2024年第12期1667-1673,共7页Foundry

摘　　要：基于单因素试验和正交试验,研究了磷酸盐干态覆膜砂后处理工艺,探究装炉方式、加热温度、保温时间及冷却方式对试样性能的影响,建立及验证了加热温度、保温时间、冷却方式与发气量之间的数学模型;借助TG-DSC、SEM-EDS等表征技术对影响机理进行了分析。结果表明,加热后处理工艺优化方案为随炉加热120℃×10 min,空冷;所得试样的发气量为15.9 mL/g,降低了15.0%;抗拉强度达1.91 MPa,提升了18.6%。多元线性回归模型与试验结果吻合,试验值与预测值误差率在5%以内;显微分析表明,适当的后处理可促使覆膜砂粘结膜中残留的水合物进一步放水,形成水蒸气逸出,部分水分子润湿周围粘结膜,在降低试样发气量的同时,提高覆膜砂的粘结强度。Based on single-factor and orthogonal tests,the post-treatment process of dry phosphate coated sand was studied to investigate the effects of furnace loading method,heating temperature,holding time and cooling mode on the properties of the samples,a mathematical model between heating temperature,holding time,cooling method and gas revolution was established and validated,and the mechanism was analyzed with the help of characterization techniques such as TG-DSC,SEM-EDS.The results showed that the optimization scheme of the post-treatment process was 120℃×10 min with furnace heating and air cooling,the gas volume of the sample reduced to 15.9 mL/g by 15.0%,and the tensile strength could be up to 1.91 MPa by 18.6%.The multiple linear regression model matched the experiments results,and the error rate between the experimental value and the predicted value was within 5%.Microscopic analysis showed that appropriate post-treatment could prompt the residual hydrate in the bonding film of the coated sand to further release water,part was formed water vapor and emitted,and the other water molecules wetted the surrounding bonding film,which improved the bonding strength of the coated sand while reducing the gas evolution in the samples.

关 键 词：磷酸盐干态覆膜砂 加热后处理 正交试验 发气量 抗拉强度 

分 类 号：TG221[金属学及工艺—铸造]