| According to the special requirements of friction material for offshore Wind Turbines, this paper takes brass powder and brass fiber as new type matrix for Cu-based P/M friction material. By means of metallographic microscope, SEM, MM-1000-type tribo-tester and electrochemical workstation, the effects of different brass matrixes on physical, mechanical, tribological and anti-corrosion performances of material were studied. The optimum composition of material was confirmed by adjusting zinc content in the matrix, with excellent tribological performances and corrosion resistance. The conclusions can be drawn as the following:(1) At different braking speeds, different brass substrates had the same influence on tribological properties of materials:with the addition of brass powder and brass fiber, the wear-resistance of materials was obviously improved at low braking speeds; under the high velocity conditions as the content of zinc increased, the wear-resistance of materials decreased, and then increased. The friction coefficient and wear rate increased with the increase of braking speed. It was found that the material with different brass substrate mainly occurred adhesive wear.(2) In artificial seawater, The influence of brass matrixes on corrosion resistance were similar: With the increment of Zn content, anti-corrosion performances increased firstly and then decreased. When the Zn content reached 9%, material possessed best corrosion resistance. Both group shown the same corrosion mechanism:zinc was dissolved firstly and passivation existed in the corrosion process; Corrosion forms were intergranular corrosion and interface corrosion.(3) With the same Zn content, samples which contain brass fiber have better wear resistance and worse corrosion resistance than that contain brass powder.(4) Considering the tribological and anti-corrosion properties, as the content of Zn is 9%, synthesis performances of both group materials reach best. |
PDF Full Text Request