Study On The Preparation Of FeCoNiZrSiB Amorphous Alloying Powder And Performance Of Its Coating

Amorphous alloy has high yield strength, large elastic strain limits,good wear and corrosion resistance, good magnetic property. They are widely applied in the fields of sports, electric power and medicine etc, which is a popular research for current material world. A new type of alloy composition was design based on the experienced principles. The effect of Co and Belement on glasses forming ability of(Fe0. 7Ni0. 3)8 0Zr6Si1 4 alloy was studied by Mechanical Alloying(MA). The phase, phase transformation and microstructure of the milled powders were studied by X-Ray Diffractio n(XRD),Scanning Electron Microscope(SEM) and Differential Scanning Calorimetry(DSC). The milled powders which contained a morphous phase were chosen to prepare coating on ZMn13 steel substrate by plasma spraying. The effect of the spraying process parameters on the microhardness and porosity of coating was studied. The wear resistance and wear mechanisms of the coating and the substrate materials were comp ared. The conclusions are as follows:The X-Ray diffraction peak of the milled(Fe0. 6Co0. 1Ni0. 3)8 0Zr6Si1 4 alloying powders is wider than that of the milled(Fe0.7Ni0.3)80Zr6Si14 alloying powders. The particle size of the milled(Fe0.6Co0. 1Ni0.3)80Zr6Si1 4 alloyin g powders is smaller than that of the milled(Fe0. 7Ni0. 3)8 0Zr6Si1 4 alloying powders. It demonstrates that Co elements can improve the glasses forming ability of(Fe0. 7Ni0. 3)8 0Zr6Si14 alloy. The milled(Fe0. 6Co0. 1Ni0. 3)8 0- xZr6Si1 4Bx(x=5,10) alloying powder contains much amorphous phase. The beginning crystal temperature and supercooled liquid region of milled(Fe0. 6Ni0. 3Co0. 1)7 5-Zr6Si1 4B5 are 432℃ and 75℃. Besides, the(Fe0. 6Co0. 1Ni0. 3)7 5Zr6Si1 4B5 amorphous powers is more ther mally steady. The effect of milling time on the phase and microstructure of(Fe0. 6Co0. 1Ni0. 3)7 5Zr6Si1 4B5 alloying powders was studied. The results show that the powders milled for 80 h contains much amorphous and has a nearly-spherical surface morphology.The coatings on ZMn13 steel substrate by air plasmaspray with the mille d powder were prepared. The coatings contain a morphous and crystalline phase at the same ti me. The relationship between spraying process parameters and the microhardness, the porosity of the coating was studied. The results show that the microhardness of the coating reach 599.7HV and the porosity of the coating decrease to 3.9% when the spraying voltage is 70 V, the spraying current is 375 A and the spraying distance is 150 mm. The wear rate of the coatings is lower than that of substrate at different rotation speed. The wear mechanisms of the coatings are fatigue and a little abrasive. The wear mechanisms of the substrate are wear and abrasive.