Development of High-Performance Enamel Coating on Grey Iron by Low-Temperature Sintering.

Dan Song,Dan Song,Yanxin Qiao,Jiapeng Sun,Jinghua Jiang,Aibin Ma,Aibin Ma,Falin Yang,Ren Tang

doi:10.3390/ma11112183

Abstract

In this study, we report on a low-temperature sintered enamel coating with a high-strength bonding and wear-resistance that protected a grey cast iron substrate. The SiO2–Al2O3–B2O3 composited prescription for the enamel coating was modified by the partial substitutions of SiO2 for B2O3 and alkali metals for Li2O. The optimized enamel coating was prepared by sintering at a relatively low temperature (730 °C) for seven minutes. Due to the composition of both the amorphous and crystalline phases, the enamel coating presented sufficient hardness and excellent wear resistance. The wear volume loss and the specific wear rate of the enamel coating were obviously lower than that of the metal substrate. The enamel coating can effectively improve the service life of the grey cast iron substrate in a complex frictional environment.

Highlights

Cast-iron overflow components, which are one of the most important pieces of hydraulic equipment, have been widely applied in the industrial field
By covering the enamel coating, both the strength and toughness of the metallic substrate as well as the advantages of the chemical stability and mechanical properties of the enamel coating can be simultaneously achieved by the cast iron overflow component
Will cause a much larger thermal expansion coefficient of the enamel coating than that of the metal substrate, which results in large areas of flaking and voiding in the coating during the cooling phase

Summary

Introduction

Cast-iron overflow components, which are one of the most important pieces of hydraulic equipment, have been widely applied in the industrial field. The overflow component suffers both corrosion and strong erosion damage, as well as interaction damage. These factors promote the destruction of the overflow component, leading to tremendous loss [1,2,3,4,5]. By covering the enamel coating, both the strength and toughness of the metallic substrate as well as the advantages of the chemical stability and mechanical properties of the enamel coating can be simultaneously achieved by the cast iron overflow component. An enamel coating will greatly improve the surface performance and extend the service life of a cast-iron overflow component

Methods

Results

Conclusion