Study On Heat Treatment Process Of Zirconia Corundum / High Chromium Cast Iron Honeycomb Composites

With the continuous development of modern industry, consumption of wear-resistant material increase every day, traditional iron material could not meet the demand of wear-resistant material. Not only does ceramic-metal composite own the high hardness and good wear resistance. But also it unites the good toughness of metal matrix. It solves the contradiction of traditional iron material between high hardness and good toughness. At present, researches on the preparation of ceramic-metal composite are increasingly deep. Heat treatment technology is the key of composite performing its max potential. Owning the different properties of physical and chemistry between ceramic and metal. Composite is tended to crack during heat treating. Method of acquiring excellent wear-resistant composite part is the focus of heat treatment.On the basis of preparing the zirconia corundum/high chromium cast iron successfully, this article took a series of exploration on the chemistry composition of matrix, tempering and quenching temperature to enhance its wear-resistant property. And made test on composite treated by different technology, The result shows that when Cr26 high chromium cast iron was selected as matrix and added the right amount of Mo, Ni, Cu and other alloying element to adjust its properties, and combining the proper heat treatment process, cracking during heat treatment can be avoided. According to the test result of hardness and analysis of residual austenite XRD, it can be concluded that when composite was quenched at 1030 ℃ and tempered at 530℃, hardness of high chromium cast iron was 62.2HRC, and it satisfied the demand for hardness of composite.Combining with the element distribution within interface and the morphology of interfacial transition layer. This article theoretically analyzes the formation mechanism of interfacial transition layer and its role in binding interface, based on which the variation of interfacial transition layer during heat treatment process was studied. The result show that under the condition of high temperature, part B4C of the particle cladding layer reacted with the molten metal liquid directly and formed the iron boron phase. Which could make metal of interface turn to cermet, and weakened physical performance between ceramic and metal. And The other B4C of the particle cladding layer was oxidized as B2O3, combing with Al2O3, SiO2 coming from binder it turned as oxide melt which combined with phases of ceramic and migrated to each other. The two effect enhanced the binding interface and reduced the tendency of cracking when preparing composite and heat treating. And with rising of quenching temperature. The interfacial bonding of composite was more closely, and intermediate phase of interfacial layer became more uniform and compact.The three-body wear test results of composites heat treated by different methods show that property of wear-resistant is positively correlated with the hardness of metal matrix when ceramic particle volume fraction were similar. And the property of wear-resistant of composite after heat treatment was around 7 times of high chromium cast iron with the same method of heat treatment.