| With the acceleration of industrialization,Single wear-resistant materials are hard to meet the needs of actual production,The composites materials is the inevitable trend of their development.ZTA particles were used to improve the wear resistance of ZG50Cr5 Mo alloy wear-resistant steel,and it's meaningful to discuss the mechanical properties and wear resistance of composite materials.The influence of the mass ratio of the metal matrix and the ceramic particle preform on the composite quality is discussed.The results show that when the relative position of the preform in the cavity wall is definite,the mass ratio of the metal matrix to the ZTA particle preform is greater than 15,higher quality composites can be obtained.16 mesh,36 mesh,60 mesh,90 mesh,120 mesh and 150 mesh ZTA particles were selected as reinforcing phase.The volume fraction of ZTA particles in the composite was adjusted by adding reduced iron powder in the preform.The results show that when the 20%,40%,60%,80% mass fr action iron powder were added in the preform,the volume fraction of the particles in composites prepared by 36 mesh ZTA particles were 15.9%,21.7%,32.3%,37.5%,the volume fraction of the particles in composites prepared by 60 mesh ZTA particles were 12.5%,26.3%,30.1%,37.8%,the volume fraction of the particles in composites prepared by 90 mesh ZTA particles were 12.8%,19.2%,25.7%,31.8%,the volume fraction of the particles in composites prepared by 120 mesh ZTA particles were 13.5%,19.1%,29.5%,30.43%,the volume fraction of the particles in composites prepared by 150 mesh ZTA particles were 13.3%,18.2%,25.1%,31.1%,60 ZTA particles prepared by the volume fraction of particles in the composite were 12.5%,26.3%,30.1%,37.8%,90 ZTA particles prepared by the volume fraction of particles in the composite were 12.8%,19.2%,25.7%,31.8%,120 ZTA particles prepared by the volume fraction of particles in the composite were 13.5%,19.1%,29.5%,30.43%,150 ZTA particles prepared by complex volume fraction of particles in the composite material were 13.3%,18.2%,25.1%,31.1%.XRD results showed that the main phases in the composites were Al 2O3,Zr O2,(Cr,Fe)3C,(Cr,Fe)7C3,Fe(Cr Al)2O4?Fe3+2Al2(Si O4)3?Al0.5 2Zr0.48O1.74?Al9Cr4.The effect of size and volume fraction of ZTA particles on the hardness and compressive strength of the composites were studied.The results show that when the ZTA particle content in the preform is 60%,the hardness of the composites made of 36 mesh,60 mesh,90 mesh,120 mesh and 15 0 mesh ceramic particles are 62.1HRC,60.4HRC,60.2HRC,59.4HRC and 58.7HRC.The compression test results show that when the content of ZTA particles in the preform was 60%,the compressive strength of composites prepared by 60 mesh,90 mesh,120 mesh and 1 50 mesh particles were 1559.3 MPa,1593.9 MPa,1687.5 MPa,1622.4 MPa,compressive strain were 1.2%,1.2%,1.02%,0.42%,elastic modulus were 31.58 GPa,39.4 GPa,39.4 GPa,90 GPa.The composites made of 60,90,120 and 150 mesh ceramics were tested for impact abrasive wear.The results show that when the impact energy is 2 J,60-3,90-3,120-3,150-3 composite impact abrasive wear resistance were 1.9 times,2.9 times,2.8 times and 2.9 times than that of metal matrix.The abrasive wear test results showed that composites prepared by 16 mesh ZTA particles is 4.2 times that of metal matrix;the wear performance of composites prepared by 90 mesh,60 mesh,36 mesh and 16 mesh ZTA particles abrasive were 1.29 times,1.56 times,2 times and 4.2 time that of the metal matrix.The wear of the triad abrasive of the composite is mainly due to the fatigue and shedding of the intergranular metal matrix,accompanied by partial cutting wear.The analysis was made on interface composition and mechanical performance,found that the average levels of Al,O,Si were 16.2%,43.6%,21%;the micro hardness and modulus of the interface were 20 GPa,9.17 GPa,9.17 GPa and 324 GPa,142.25 GPa,136.5GPa. |
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