Influence of Texture Orientation of CVD Al2O3 Coating on Microstructure and Properties
The chemical vapor deposition(CVD)Al2O3 coating possesses high hardness,good toughness,as well as excellent wear resistance,heat resistance,oxidation resistance,and chemical stability.It is a cutting tool coating material with excellent comprehensive properties.In this paper,the MT-TiCN/Al2O3/TiN coatings with(104),(0012),and(012)texture orientations of α-Al2O3 were prepared by CVD.The microstructures,texture orientations,and coating properties were studied by using X-ray diffraction(XRD)and scanning electron microscope(SEM).The experimental results show that the columnar grains of the α-Al2O3 coating with high(0012)texture orientation are more complete.The texture orientation of the α-Al2O3 coating will affect the morphology and texture orientation of the surface TiN.The surface TiN of the α-Al2O3 coating with a high(0012)texture orientation exhibits a high(111)texture orientation.The surface TiN of the α-Al2O3 coating with a(104)texture orientation shows a weak(111)+(331)mixed texture orientation.The surface TiN of the α-Al2O3 coating with a(012)texture orientation presents a weak(220)+(420)mixed texture orientation.The results of the cutting experiment on 42CrMo indicate that the wear resistance of the α-Al2O3 coating with a high(0012)texture orientation is superior to that of the coatings with(104)and(012)texture orientations,mainly manifested in that both the rake face and the flank face of the α-Al2O3 coating with a high(0012)texture orientation have better wear resistance.
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