Abstract
In this paper, a two-step method, rapid-flow mixing followed by high-pressure compositing was used to prepare a macro-ZTA (ZrO2-toughened Al2O3) particles reinforced high chromium cast iron (HCCI) matrix composite. The method is based on the squeeze casting process without general casting pollution problems. The microstructure, mechanical properties and dry sliding wear performance of the fabricated composite were investigated. The results showed that the particles were distributed uniformly throughout the iron matrix and a tightly bonded interface was obtained. Under dry sliding wear conditions, the wear resistance of the composite was significantly improved in comparison with the HCCI alloy, and the relative wear resistance was 1.8 and 2.9 times at the applied load of 300 and 900 N, respectively. When the load increased from 300 N to 900 N, the wear characteristics of the composite changed from shallow and narrow grooves and scratches to damages in the form of fragmentation of particles, transfer layer and interface cracking.
Highlights
Iron and steel materials, as one of the dominant materials in industrial applications, play an indispensable role in the process of social development [1,2]
Used sessile drop technique, the results showed that the wetting angle of high chromium cast iron (HCCI) on ZTA basement decreased from 102.3◦ to 88.2◦ after the ceramic was coated a Ni layer
The higher magnification graph of fracture surface (Figure 6b) shows that the fracture mode of the matrix is dominated by a ductile fracture, which is characterized by the existence of shallow dimples
Summary
As one of the dominant materials in industrial applications, play an indispensable role in the process of social development [1,2]. TiC–Stainless steel composite [5,6], WC/Fe composite [7,8], and ZTAp/iron composite [9]. Among these composites, ZTA particle reinforced iron matrix composite is a promising wear-resistant composite material, in which ZTA particle has a high hardness and toughness, thermal shocks resistance, and a relatively close thermal expansion coefficient with iron [10,11]. To solve the problem that particles are difficult to distribute uniformly inside the metal matrix due to the significant difference of density between the ZTA and iron, the composite was prepared by first making the particles into preform and using infiltration casting process
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