Preparation process of dual-metal engine cylinder composite material

Abstract

The invention relates to a preparation process of a dual-metal engine cylinder composite material, the preparation process comprises the following steps of: firstly, acid-washing a HT250 cast iron cylinder liner and carrying out surface degreasing and derusting treatment on the HT250 cast iron cylinder liner; then dipping the HT250 cast iron cylinder liner into a prepared proportional saline solution, so that the surface of the HT250 cast iron cylinder liner is soaked in the saline solution; then drying the HT250 cast iron cylinder liner, and putting the HT250 cast iron cylinder liner in a ZL101A aluminum alloy melt body for hot immersion plating; fixing the immersion-plated HT250 cast iron cylinder liner in a mold cavity of a metal mold casting mold, casting, melting and cooling a ZL101A aluminum alloy, wherein concentration of the saline solution is 100-200g/L, the saline solution is prepared by mixing water together with potassium fluoride KF, potassium chloride KCl, sodium chloride NaCl, calcium fluoride CaF2, and calcium chloride CaC12 according to a mass ratio of 39-46:16-26:15-21:6-15:5-10. According to the preparation process, the engine cylinder composite material is obtained through treating the ZL101A aluminum alloy and HT250 cast iron by a self-prepared surfactant and implementing a dual-metal composite casting process on the ZL101A aluminum alloy and the HT250 cast iron, wherein two metal materials of the ZL101A aluminum alloy and the HT250 cast iron are not mixed and kept with original physical properties; but the ZL101A aluminum alloy and the HT250 cast iron obtain an extremely perfect combination interface, so that casting metallurgical bonding of 99.5 percent and above is achieved.

Description

technical field [0001] The invention relates to a preparation process of a bimetal engine cylinder composite material, belonging to the technical field of metal material preparation. Background technique [0002] As a very potential material that has emerged in the past ten years, bimetallic composites have attracted widespread attention. Many experts and scholars at home and abroad have focused on related research, such as: the surface aluminum-silicon alloy crystallization of gray iron or ductile iron Research on the formation of reaction layer[S.Pietrowski,T.Szymczak.Theoretical basis of Al-Si coat crystallization on gray and nodular cast iron and making the layered items using it[J].Journal of achievements inmaterials and manufacturing engineering,2011(49) 421-439]; H.Springer, A.Kostka and others studied low-carbon steel and industrial pure aluminum composite materials, and used dual-alloy composite casting technology to prepare composite materials from low-carbon steel...

AI Technical Summary

Problems solved by technology

The flux used in the traditional hot-dip plating process mainly contains ZnCl 2 and containing K 2 ZrF 6 A water-soluble flux, here ZnCl 2 It is easy to generate gas, so that castings are prone to defects such as pores; while using K 2 ZrF 6 water-soluble flux, since K 2 ZrF 6 Expensive, which increases production costs

[0003] Aluminum alloy and cast iron engine cylinder composite materials have broad application prospects. Due to the huge difference in physical properties between aluminum alloy and cast iron, it is difficult to form an effective bonding interface, which limits the performance and use of this type of composite material.

However, continuous extrusion coating and other production processes, due to high cost and difficulty, also restrict the production and application of aluminum alloy and cast iron composite materials in engine cylinders

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