To develop a suitable production process for fiber reinforced investment casting shell mold,three methods were studied:the traditional method(M_(1)),the method of adding fiber into silica sol with mechanical stirring ...To develop a suitable production process for fiber reinforced investment casting shell mold,three methods were studied:the traditional method(M_(1)),the method of adding fiber into silica sol with mechanical stirring and ultrasonic agitation(M_(2)),and the method of adding fiber into slurry with mechanical stirring and ultrasonic agitation for durations of 3,15,30,and 45 min(M_(3)).The bending strength,high-temperature self-load deformation,and thermal conductivity of the shell molds were investigated.The results reveal that the enhancement of fiber dispersion through ultrasonic agitation improves the comprehensive performance of the shell molds.The maximum green bending strength of the shell mold by M_(2) reaches 3.29 MPa,which is 29% higher than that of the shell mold prepared by M_(1).Moreover,the high-temperature self-load deformation of the shell mold is reduced from 0.62% to 0.44%.In addition,simultaneous ultrasonic agitation and mechanical stirring effectively shorten the slurry preparation time while maintaining comparable levels of fiber dispersion.With the process M_(3)-45 min,the fillers are uniformly dispersed in the slurry,and the fired bending strength and the high-temperature self-load deformation reach 6.25 MPa and 0.41%,respectively.Therefore,the proposed ultrasonic agitation route is promising for the fabrication of fiber-reinforced shell molds with excellent fibers dispersion.展开更多
目前,粘土湿型砂主要用来生产中小铸铁件和铸铝件以及少量小型铸钢件,特别是汽车、拖拉机的关键铸件,如气缸体、气缸盖、曲轴、制动鼓等,其铸件质量往往与湿型砂性能有关。作者根据GB/T2684-2009铸造用砂及混合料试验方法、GB/T212-200...目前,粘土湿型砂主要用来生产中小铸铁件和铸铝件以及少量小型铸钢件,特别是汽车、拖拉机的关键铸件,如气缸体、气缸盖、曲轴、制动鼓等,其铸件质量往往与湿型砂性能有关。作者根据GB/T2684-2009铸造用砂及混合料试验方法、GB/T212-2001煤的工业分析方法、JB/T9221-1999铸造用湿型砂有效膨润土及有效煤粉试验方法、JB/T9222-2008湿型铸造用煤粉、JB/T9227-1999铸造用膨润土和粘土、JB/T9442-1998铸造用硅砂,同时参照了美国砂型和砂芯实验手册(AFS Mold and Core Test Handbook,3rd Edit.),系统地介绍了湿型砂性能检测和湿型砂原材料质量测定方面的国家标准和机械行业标准以及最新的检测仪器,更重要的是还根据其他参考资料以及自己参加的科研和操作实践,以"补充说明"的形式给出了湿型砂性能检测的技巧,并针对国内外相应的检测方法和检测仪器性能提出了自己的见解。"湿型砂性能检测技术"一文包括湿型砂取样方法,含水量检测,紧实率、透气性、湿态强度、韧性、可紧实性和流动性、含泥量、砂粒粒度、有效膨润土量、有效煤粉和发气量、热湿拉强度等型砂性能的测量方法和注意事项共12节内容;"湿型砂原材料质量的测定方法"一文包括原砂、膨润土、煤粉、淀粉等湿型砂原材料的质量判定标准和检测技术共4节内容。两文十分适合铸造工厂型砂实验室主管工程技术人员以及从事造型材料研究、生产和销售的人员阅读。本刊从2010年第1期起连载刊登这两篇文章。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 5186504)the University Science Foundation for Young Science and Technology Talents in Inner Mongolia Autonomous Region of China (Grant No. NJYT22078)+2 种基金the Basic Scientific Research Expenses Program of Universities directly under Inner Mongolia Autonomous Region (Grant No. JY20220059)the Inner Mongolia Autonomous Region ‘Grassland Talent’ project Young Innovative Talent Training Program Level ⅠBasic Research Expenses of Universities directly under the Inner Mongolia Autonomous Region (Grant No. ZTY2023040)。
文摘To develop a suitable production process for fiber reinforced investment casting shell mold,three methods were studied:the traditional method(M_(1)),the method of adding fiber into silica sol with mechanical stirring and ultrasonic agitation(M_(2)),and the method of adding fiber into slurry with mechanical stirring and ultrasonic agitation for durations of 3,15,30,and 45 min(M_(3)).The bending strength,high-temperature self-load deformation,and thermal conductivity of the shell molds were investigated.The results reveal that the enhancement of fiber dispersion through ultrasonic agitation improves the comprehensive performance of the shell molds.The maximum green bending strength of the shell mold by M_(2) reaches 3.29 MPa,which is 29% higher than that of the shell mold prepared by M_(1).Moreover,the high-temperature self-load deformation of the shell mold is reduced from 0.62% to 0.44%.In addition,simultaneous ultrasonic agitation and mechanical stirring effectively shorten the slurry preparation time while maintaining comparable levels of fiber dispersion.With the process M_(3)-45 min,the fillers are uniformly dispersed in the slurry,and the fired bending strength and the high-temperature self-load deformation reach 6.25 MPa and 0.41%,respectively.Therefore,the proposed ultrasonic agitation route is promising for the fabrication of fiber-reinforced shell molds with excellent fibers dispersion.
文摘目前,粘土湿型砂主要用来生产中小铸铁件和铸铝件以及少量小型铸钢件,特别是汽车、拖拉机的关键铸件,如气缸体、气缸盖、曲轴、制动鼓等,其铸件质量往往与湿型砂性能有关。作者根据GB/T2684-2009铸造用砂及混合料试验方法、GB/T212-2001煤的工业分析方法、JB/T9221-1999铸造用湿型砂有效膨润土及有效煤粉试验方法、JB/T9222-2008湿型铸造用煤粉、JB/T9227-1999铸造用膨润土和粘土、JB/T9442-1998铸造用硅砂,同时参照了美国砂型和砂芯实验手册(AFS Mold and Core Test Handbook,3rd Edit.),系统地介绍了湿型砂性能检测和湿型砂原材料质量测定方面的国家标准和机械行业标准以及最新的检测仪器,更重要的是还根据其他参考资料以及自己参加的科研和操作实践,以"补充说明"的形式给出了湿型砂性能检测的技巧,并针对国内外相应的检测方法和检测仪器性能提出了自己的见解。"湿型砂性能检测技术"一文包括湿型砂取样方法,含水量检测,紧实率、透气性、湿态强度、韧性、可紧实性和流动性、含泥量、砂粒粒度、有效膨润土量、有效煤粉和发气量、热湿拉强度等型砂性能的测量方法和注意事项共12节内容;"湿型砂原材料质量的测定方法"一文包括原砂、膨润土、煤粉、淀粉等湿型砂原材料的质量判定标准和检测技术共4节内容。两文十分适合铸造工厂型砂实验室主管工程技术人员以及从事造型材料研究、生产和销售的人员阅读。本刊从2010年第1期起连载刊登这两篇文章。
