The Study Of Wear Properties Of ZTA Ceramic Particles Reinforced High Chromium Cast Iron Matrix Composites

At this time, high chromium cast iron as a typical kind of wear-resistant material is usedin many areas such as mining and cement industry. However, its resistance is low becauseresistance is restrained with toughness. And the low resistance has become a key technicalproblem which can constrain the development of this industry. Ceramic particles reinforcedhigh chromium cast iron matrix composites both have the good properties of metal materialand ceramics. They have high strength, good shaping property, good impact toughness, highhardness and high wear resistance. So the composites have broad application prospects.Ceramic particles reinforced high chromium cast iron matrix composites had been preparedsuccessfully with liquid metal infiltration technology and fabrication of porous ceramicpreforms，using ZTA(ZrO2toughened Al2O3) ceramic particles and high chromium cast ironas raw materials. The high temperature abrasive wear resistance of different size of ZTAceramic particle reinforced high chromium cast iron matrix composites at differenttemperatures and under different pressure was studied (by OM\SEM\XRD methods). Inaddition, the erosive wear resistance of different size of ZTA ceramic particle reinforced highchromium cast iron matrix composites was studied in the mud. The results are as follows:(1) After adding ZTA ceramic particles,the high temperature abrasive wearperformances were significantly better than single high chromium cast iron base. Under thesame temperature，the high temperature wear resistance of composites with ZTA ceramicparticles which sizes are between1.7~2.36mm is best. Under the same pressure, the mass lossof the composites in higher temperature is more. Under normal atmospheric pressure，themass loss of composites’ high temperature abrasive wear is less than that in low vacuum. Thehigh temperature abrasive wear mechanism of ZTA ceramic particle reinforced highchromium is mainly abrasive wear，fatigue wear，oxidation wear and adhesive wear.(2) Adding ceramic particle can reduce mass loss of high chromium cast iron. The massloss of composites with1.7~2.36mm size ZTA ceramic particle is lest. The morphologies ofZTA reinforced composites after erosion are corrosion pits. Its mechanisms are cutting wearand plowing abrasion. The percent of corrosive component accounting for mass loss of composites with0.6~0.85mm ZTA particles is most. Thrust reverser，the percent of wearcomponent accounting for mass loss of high chromium cast iron is most. The percent ofcomposites with1.7~2.36mm ZTA particles is second. The percent of composites with0.6~0.85mm ZTA particles is lest.