摘要
无机盐粘结剂水溶性型芯以其优异的水溶溃散性能及环境友好特性在生产复杂铝合金铸件中有很好的应用前景。在制备此类型芯时,无机盐以溶液形式加入的热捣固成形工艺因其回收工艺简单、成本低廉而具有显著优势。本研究旨在以热捣固法成形一种以高溶解度的水溶性无机盐为粘结剂的水溶性氯化钙砂芯,研究成形工艺参数、氯化钙溶液及膨润土加入量对型芯抗拉强度及发气量的影响。实验结果表明,在加热时间为3 min、溶液加入量为120 m L/kg、膨润土加入量为1 wt%、加热温度为200℃时所制得的型芯以内聚断裂为主,表现出较高的抗拉强度(1.6 MPa),且该型芯发气量较低(11.2 m L/g),水溶溃散性能好。因此,适用于低熔点金属铸件的生产。
Water soluble cores （WSCs）prepared with inorganic salt as binder have promising application to manufacturing complex aluminum alloy castings because of its excellent collapsibility and environment friendly. During these cores＇ preparing, the hot pressing technology adding inorganic salt in the form of solution has significant advantages on account of easy reclamation and low cost. The purpose of this study is to prepare a water-soluble core with a kind of high solubility inorganic salt calcium chloride by the hot tamping method. The effects of technological parameters, addition of solution and bentonite on tensile strength and gas evolution were investigated. Results show that the tensile strength of calcium chloride sand core reaches 1.6 MPa featuring cohesive fracture and the gas evolution is 11.2 mL/g under the condition of heating time 3 min, addition of solution 120 mL/kg, addition of bentonite lwt% and heating temperature 200 ℃, which makes it suitable for casting low melting metal with complex construction.
出处
《铸造》
CAS
CSCD
北大核心
2016年第8期729-733,共5页
Foundry
基金
国家自然科学基金资助项目(51405002)
关键词
水溶性型芯
氯化钙
抗拉强度
粘结机理
正交实验
water-soluble core
calcium chloride
tensile strength
bonding mechanism
orthogonal experiment
