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Feasibility Study about Zn-22 wt.% Al Eutectoid Alloy Used as Delay Detonator Body

Author: TangWei
Tutor: WangJingTao；BaoGuoGang；ZhangXinPing
School: Nanjing University of Technology and Engineering
Course: Materials Engineering
Keywords: Delay detonator body Zn-22wt.%Al eutectoid alloy porthole die design hot extrusion feasibility study
CLC: TQ565.2
Type: Master's thesis
Year: 2012
Downloads: 21
Quote: 0
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Abstract


A great deal of lead has been used in the production links of Delay detonator body, and it does great harm to natural environment and human health, to solve this problem, this study try to use Zn-22wt.%Al eutectoid alloy with an ultrafine-grained structure at room temperature to replace lead to produce Delay detonator body in a innovative way, thus make Delay detonator body out of lead. This study included with melting alloy, heat treatment, hot extrusion, mechanical properties and microstructure analysis, porthole die design, preparation of Zn-22wt.%A1 alloy pipe, tube drawing, a set of production process.The homogenizing treatment at 360℃for 20h and quenching subsequently can effectively develop an ultrafine-grained structure in Zn-22wt.%Al casting blank, the microstructures had an equiaxed and homogeneously distributed Al-rich and Zn-rich duplex-phase and its average grain size was about 0.5μm. At the same time, the plastic deformation ability at room temperature has been greatly improved.As we know, extrusion temperature and extrusion ratio have an important impact on the properties of materials. In this article, Zn-22wt.%Al alloy samples with different microstructures and mechanical properties were obtained by hot extrusion. From the result,it is concluded that with the rise of extrusion temperature(200、250、300、350℃) and extrusion ratio (8、16、32),the flow stress is increasing while the elongation-to-failure is decreasing. When extrusion temperature is 200℃and extrusion ratio is 8,this alloy exhibited a large elongation of 267% albeit at room temperature and a rate of 10-3s-1.The porthole die of circular tube is designed and the extrusion process is simulated by Deform-3D simulation software. It is concluded that maximum welding pressure on the welding plane increase with respect to chamber height, while it is not much affected by extrusion temperature. When chamber height is 15mm,high quality pipe is prepared out at the temperature of 200℃。Compared with lead, the hardness and flow stress of Zn-22wt.%Al alloy is higher, limited to existing equipment, the drawing process can not be finished normally and confront with some difficulties. To solve this problem, this article brings forward some improvement measures。The experiment also show that Zn-22wt.%Al alloy do not generate too much heat during the drawing process, which is very suitable for producing Delay detonator body, but still need to continue to explore and research.

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CLC: > Industrial Technology > Chemical Industry > Explosives industry, match industry > Ignition point of Explosive Material > Detonator
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