采用成本低廉的纺织废料纤维作为组成原料制备环保型无石棉有机物(NAO)刹车片,研究了不同纺织废料纤维含量对刹车片的结构与摩擦磨损性能的影响。结果表明:纺织边角料复合NAO刹车片结构均匀致密,主要含有SiO_(2)、CaCO_(3)、BaSO_(4)3...采用成本低廉的纺织废料纤维作为组成原料制备环保型无石棉有机物(NAO)刹车片,研究了不同纺织废料纤维含量对刹车片的结构与摩擦磨损性能的影响。结果表明:纺织边角料复合NAO刹车片结构均匀致密,主要含有SiO_(2)、CaCO_(3)、BaSO_(4)3种晶相。在钢球作为摩擦对偶件往复摩擦条件下,随着w纺织纤维从0增加到6%,刹车片的摩擦系数从0.52降低到0.33,磨损速率从0.787 mm 3·m^(-1)·kN^(-1)降低到0.233 mm 3·m^(-1)·kN^(-1),耐磨性提高,磨损机制主要是疲劳磨损;刹车片的硬度从34 HR增加到57 HR,抗弯强度从21.85 MPa增加到51.76 MPa,从纺织纤维复合NAO刹车片断口中可以看出,韧性纺织纤维的加入改善了刹车片各组分界面结合,提高了强度,从而表现出更优异的耐磨性能。展开更多
In the present study,high-zirconium ternary Zr-Al-Fe bulk metallic glasses(BMGs) with low Young's modulus and good plasticity were developed.Zr75 Al7.5 Fe17.5 BMG exhibits a low Young's modulus of 70 GPa and h...In the present study,high-zirconium ternary Zr-Al-Fe bulk metallic glasses(BMGs) with low Young's modulus and good plasticity were developed.Zr75 Al7.5 Fe17.5 BMG exhibits a low Young's modulus of 70 GPa and high Poisson's ratio of 0.403.Pronounced plasticity was demonstrated under both compression and bending conditions for the BMGs.Furthermore,the alloys show high corrosion resistance in phosphate buffered solution.The combination of desirable mechanical and chemical properties implies potential for biomedical applications.展开更多
In this paper, high-zirconium Zr66＋2xAl9-x（Ni1/3Cu2/3）25-x （x=0,1,2 at.%） bulk metallic glasses with high strength and large duc- tility were fabricated by copper mould casting. The effects of zirconium content o...In this paper, high-zirconium Zr66＋2xAl9-x（Ni1/3Cu2/3）25-x （x=0,1,2 at.%） bulk metallic glasses with high strength and large duc- tility were fabricated by copper mould casting. The effects of zirconium content on the glass-forming ability （GFA）, thermal properties and mechanical properties were investigated using X-ray diffractometer （XRD）, differential scanning calorimeter （DSC）, and mechanical testing system in compressive and three-point bending modes, respectively. The high-zirconium BMGs show the critical diameters of 3-5 ram, the supercooled liquid region ranging from 70 K to 99 K, and the yield strength of over 1700 MPa. The Zr70Al7（Ni1/3Cu2/3）23 BMG exhibits a large compressive plastic strain up to 21% and a high notch toughness value of 60.6 MPa m1/2. The increase in Zr content results in the decrease in GFA and thermostability, and in the improvement of plasticity under compressive and three-point bending conditions. The superior plasticity of high-zirconium BMGs is at- tributed to their high Poisson＇s ratio and small elastic modulus ratioμl/B.展开更多
文摘采用成本低廉的纺织废料纤维作为组成原料制备环保型无石棉有机物(NAO)刹车片,研究了不同纺织废料纤维含量对刹车片的结构与摩擦磨损性能的影响。结果表明:纺织边角料复合NAO刹车片结构均匀致密,主要含有SiO_(2)、CaCO_(3)、BaSO_(4)3种晶相。在钢球作为摩擦对偶件往复摩擦条件下,随着w纺织纤维从0增加到6%,刹车片的摩擦系数从0.52降低到0.33,磨损速率从0.787 mm 3·m^(-1)·kN^(-1)降低到0.233 mm 3·m^(-1)·kN^(-1),耐磨性提高,磨损机制主要是疲劳磨损;刹车片的硬度从34 HR增加到57 HR,抗弯强度从21.85 MPa增加到51.76 MPa,从纺织纤维复合NAO刹车片断口中可以看出,韧性纺织纤维的加入改善了刹车片各组分界面结合,提高了强度,从而表现出更优异的耐磨性能。
基金supported by the National Natural Science Foundation of China (Grant No. 51071008,51131002 and 51161130526)
文摘In the present study,high-zirconium ternary Zr-Al-Fe bulk metallic glasses(BMGs) with low Young's modulus and good plasticity were developed.Zr75 Al7.5 Fe17.5 BMG exhibits a low Young's modulus of 70 GPa and high Poisson's ratio of 0.403.Pronounced plasticity was demonstrated under both compression and bending conditions for the BMGs.Furthermore,the alloys show high corrosion resistance in phosphate buffered solution.The combination of desirable mechanical and chemical properties implies potential for biomedical applications.
文摘In this paper, high-zirconium Zr66＋2xAl9-x（Ni1/3Cu2/3）25-x （x=0,1,2 at.%） bulk metallic glasses with high strength and large duc- tility were fabricated by copper mould casting. The effects of zirconium content on the glass-forming ability （GFA）, thermal properties and mechanical properties were investigated using X-ray diffractometer （XRD）, differential scanning calorimeter （DSC）, and mechanical testing system in compressive and three-point bending modes, respectively. The high-zirconium BMGs show the critical diameters of 3-5 ram, the supercooled liquid region ranging from 70 K to 99 K, and the yield strength of over 1700 MPa. The Zr70Al7（Ni1/3Cu2/3）23 BMG exhibits a large compressive plastic strain up to 21% and a high notch toughness value of 60.6 MPa m1/2. The increase in Zr content results in the decrease in GFA and thermostability, and in the improvement of plasticity under compressive and three-point bending conditions. The superior plasticity of high-zirconium BMGs is at- tributed to their high Poisson＇s ratio and small elastic modulus ratioμl/B.
