Getting Aluminum Bronze Castings with SHS-Cast

Author Name(s): Zinnur T. Zagretdinov, Nikolay N. Safronov, Lenar R. Kharisov
Author Email: ln271@mail.ru

Abstract

Aluminum bronzes are used in the automotive, aviation and instrument-making, machine-tool and defense, oil and chemical industries due to the high mechanical and anti-friction properties. The corrosion resistance of the alloy makes it possible to use aluminum bronze parts in seawater, so they are widely used in shipbuilding, and the excellent antifriction properties of the alloy allow it to be used instead of tin bronzes, cheapening the cost of parts and their weight. The high cost of raw materials and electricity, multi-process technology and the complexity of the equipment design causes the high cost of the resulting alloy. A technology is proposed for obtaining bronzes from machine-building enterprises waste by means of self-propagating high-temperature synthesis, which occurs without external heat supply, without complicated machines and units and combines melting and pouring of the casting in one process. It is proposed to use copper scale, blacksmith, and aluminum chips as the starting materials. The technological process is based on a synergistic complex of casting and metallurgical factors affecting the melt in the stages of its melt preparation and crystallization in a mold. The resource-saving and waste-free process is implemented using the process of selfpropagating high-temperature synthesis.

Introduction

The bronze CuAl9Fe3 refers to tinless aluminum bronze, the chemical composition of which is regulated by GOST 18175-78. The main alloying elements in the CuAl9Fe3 brand bronze are aluminum, whose content can reach up to 10%, and iron – up to 4%. In the alloy the presence of a small amount of impurities are allowed.

Conclusion

The advantages of the SHS process before the energy and material-intensive furnace method of melt preparation are: the use of fast-dissipating heat of chemical reactions, the amount of which is sufficient to heat, melt of the charge, division it into two liquid immiscible phases and overheating them; recycling of dispersed waste of engineering in a waste-free mode; the intensity of the thermal processes of converting the charge composition to a highly overheated state and cooling the liquid phases in a form with high thermal activity. These advantages of the SHS process create prerequisites for the synthesis of engineering parts, which are advantageously distinguished by the uniqueness of the obtained characteristics and low cost.

621 total views, no views today

Download PDF File

About the author: admin