| Due to its advantages of light specific gravity,corrosion resistance,low sliding noise,small damage to the dual surface,and easy integrated molding,wear-resistant resin-based composites are gradually replacing the traditional metal-based and ceramic-based wear-resistant materials in the fields of aerospace,energy and chemical industry,marine engineering,and automobile transportation.However,it can hardly combine the comprehensive properties of high strength,heat-resistance and wear-resistance.Especially,the wear resistance of resin matrix composites is deteriorated significantly in the high temperature service environment,which,this will limit its application in aerospace,energy and chemical fields.How to improve mechanical,thermal and tribological properties of wear-resistant has become an urgent problem to be solved.Starting from the selection of the components of the composites,the high-performance thermoplastic copoly（phthalazinone ether sulfone）（PPBES）is used as resin matrix,and the high-strength,high-modulus environmentally friendly natural fiber-shorted basalt fiber（SBF）is used as reinforcement,the wear-resistant resin matrix composite（SBF/PPBES）were fabricated.The effects of different SBF contents on the mechanical properties,thermal stability and friction properties of SBF/PPBES composites were studied.The results shown that the mechanical strength,thermal stability and tribological properties of PPBES-based composites were improved by the filling of SBF.The tensile and flexural strengths of 30wt.%SBF/PPBES composites are 126 MPa and 164 MPa,respectively,which are 54%and 50.5%higher than those of pure PPBES.The 5wt%thermal gravimetric decomposition temperature(Td5%)and glass transition temperature（Tg）of SBF/PPBES composites were increased with the increase of SBF content,The Td5%and Tg of 40wt.%SBF/PPBES composites are 521℃and 268℃,respectively,which are higher than those of pure PPBES（503℃,250℃）.,The 10wt.%SBF/PPBES exhibited lowest friction coefficient of 0.437,decreased by 14.1%compared with those of pure PPBES.Furthermore,a novel antifriction and wear resistance filler,nano-Mo S2 modified basalt fiber hybrid（Mo S2-SBF）,was prepared via a simple hydrothermal method,and its micro structure was characterized by XRD,XPS and SEM.To further improve the tribological properties of SBF/PPBES composites,the wear-resistant and self-lubricating resin matrix composite（Mo S2-SBF/PPBES）were fabricated based on PPBES and Mo S2-SBF.And the mechanical properties,thermal properties,the friction and wear properties of composites with different composition were studied.In addition,the effects of different operating temperature,load and sliding speed on the tribological properties of Mo S2-SBF/PPBES composites were discussed.The Rockwell hardness,tensile strength,flexural strength and compressive strength of Mo S2-SBF/PPBES are 125.7,103MPa,145 MPa and 173 MPa,respectively,which are higher than those of Mo S2/PPBES and SBF/PPBES.And the Mo S2-SBF/PPBES composite exhibited the glass transition temperature（Tg）of 264℃,higher than those of Mo S2/PPBES（244℃）and SBF/PPBES（255℃）.Under fixed load（4.5N）and sliding speed（0.3m/s）,Mo S2-SBF/PPBES composite exhibited the lowest friction coefficient and wear rate of 0.335 and2.81?10-6mm3/Nm at room temperature,respectively,23.3%and 66.3%lower than those of SBF/PPBES.Furthermore,due to its excellent thermal property,the friction coefficient and wear rate of Mo S2-SBF/PPBES are 0.357 and 4.17?10-6mm/Nm at 200°C,respectively,decreased by 27.6%and 69.0%compared with those of SBF/PPBES.Moreover,in the face of different loads and sliding speeds,Mo S2-SBF/PPBES exhibited lowest friction coefficient and wear rate of 0.171 and 2.22?10-6mm/Nm under low load（3N）and low sliding speed（0.05m/s）.However,when the load and sliding speed increase,its tribological properties decrease significantly.In addition,in order to improve the tribological properties of Mo S2-SBF/PPBES composites under high load and high sliding speed,the Mo S2-SBF/PPBES composites were reinforced with c-BN,Si C,Ti O2.The effect and mechanism of filling with hard inorganic particles such as c-BN,Si C,Ti O2 on the mechanical,thermal and tribological properties of Mo S2-SBF/PPBES composites were studied.The results show that filling of hard inorganic particles such as c-BN,Si C,Ti O2 improves the hardness and heat resistance of Mo S2-SBF/PPBES composites,but reduces the mechanical properties of the materials.The Rockwell hardness of c-BN,Si C and Ti O2/Mo S2-SBF/PPBES composites exceeds 126,Tg is higher than266℃,and the tensile strengths are 87MPa,91MPa,and 89MPa,respectively,which are lower than those of Mo S2-SBF/PPBES composites（103 MPa）;Compared with Mo S2-SBF/PPBES,the friction coefficient and wear rate of c-BN/Mo S2-SBF/PPBES composites increased slightly.On the contrary,the tribological properties of Si C,Ti O2/Mo S2-SBF/PPBES composites were improved.The friction coefficient and wear rate of Ti O2/Mo S2-SBF/PPBES composites are0.284 and 2.17?10-6mm3/Nm,respectively;In addition,the friction coefficient and wear rate of Si C/Mo S2-SBF/PPBES and Ti O2/Mo S2-SBF/PPBES composites are further reduced under high load（6 N）and high sliding speed（0.5 m/s）,and the friction coefficient of Ti O2/Mo S2-SBF/PPBES composites is low.to 0.219. |
PDF Full Text Request