Comparative study on performance and microstructure of composite water-soluble salt core material for manufacturing hollow zinc alloy castings

被引：27

作者：

Liu, Fuchu ^{[1
,2
]}

Tu, Suo ^{[2
]}

Gong, Xiaolong ^{[2
]}

Li, Guanjin ^{[2
]}

Jiang, Wenming ^{[2
]}

Liu, Xinwang ^{[2
]}

Fan, Zitian ^{[2
]}

机构：

[1] China Univ Geosci, Sch Mech Engn & Elect Informat, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2020年 / 252卷

基金：

中国博士后科学基金;

关键词：

Composite water-soluble salt core; Green casting; Strengthening-toughening mechanism; Hollow-structure zinc alloy castings; HUMIDITY RESISTANCE; BONDED SAND; ALUMINUM-ALLOY; HIGH-STRENGTH; CARBONATE;

D O I：

10.1016/j.matchemphys.2020.123257

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The water-soluble salt core material has been successfully used for manufacturing hollow aluminum and magnesium alloy castings. However, there is rare report about the water-soluble salt core being used for lower melting point and higher density hollow zinc alloy castings. In order to obtain a high-performance composite water-soluble salt core material (CWSSC) which is suitable for manufacturing hollow-structure zinc alloy castings via high pressure die casting process, the comparative study on performance and microstructure of the salt cores fabricated by gravity casting technology was investigated using KNO3 and KCl as the base salt material with the reinforcements of bauxite or glass-fiber powder. The results show that CWSSC strengthened by reinforcements possesses many advantages of good surface quality and water-solubility rate, high bending strength and impact toughness, low shrinkage and moisture-absorption rate, and CWSSC composed of KNO3-20 mol% KCl with 15 wt % bauxite powder and 15 wt% glass-fiber powder has the better comprehensive performance, whose surface roughness is 0.4758 mu m, bending strength is 46.6 MPa, impact toughness is 21.72 kJ/m(2), and water-solubility rate is 178.21 kg/(min.m(2)) in still water at 80 degrees C with relatively low shrinkage and 24 h moisture-absorption rate. The scanning electron microscope analysis shows that the strengthening-toughening mechanisms of CWSSC mainly include refinement of the grain and deflection of the crack caused by KCl dendritic crystal and the rigid enhanced powders. A practical casting test has been conducted to prove that the developed CWSSC can be used to manufacture hollow-structure zinc alloy castings.

引用

页数：10

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