WC基体育器械用复合材料的制备及磨损性能研究

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研究了烧结温度和SiC晶须含量对WC基体育器械用复合材料的显微形貌、抗弯强度、断裂韧性、硬度和摩擦磨损性能的影响,并分析了其作用机理。结果表明,当SiC晶须含量分别为0.4%和0.6%时,WC基复合材料的抗弯强度和断裂韧性都随着烧结温度的提高而呈现先增加而后降低的趋势,在烧结温度为1 400℃时取得最大值;随着SiC晶须含量的增加,SiC晶须改性WC基复合材料的硬度呈现先增加而后降低的趋势,在SiC晶须含量为0.4%时取得硬度最大值;随着载荷的增加,不同SiC晶须含量的WC基复合材料的摩擦系数整体呈现逐渐降低的趋势;在相同的载荷条件下,SiC晶须含量为0.4%时WC基复合材料的摩擦系数最小。 The effects of sintering temperature and SiC whisker content on the microstructure, flexural strength, fracture toughness, hardness and friction and wear properties of WC-based sports equipment composites were investigated. The mechanism of action was also analyzed. The results show that the bending strength and fracture toughness of WC matrix composites increase first and then decrease with the increase of sintering temperature when the content of SiC whiskers is 0.4% and 0.6% respectively. When the sintering temperature is 1 400 ℃. With the increase of SiC whisker content, the hardness of SiC whisker modified WC matrix composites first increased and then decreased, and the maximum hardness was obtained when the content of SiC whisker was 0.4% The friction coefficient of WC matrix composites with different content of SiC whiskers decreases with the increase of load. The friction coefficient of WC matrix composites with the content of SiC whisker 0.4% is the lowest under the same load.
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[一、求值]  例1(2007年·海南)如图1,四个全等的直角三角形与中间的小正方形拼成一个大正方形.如果大正方形的面积是13,小正方形的面积是1,直角三角形的两条直角边长分别为a、b,则(a b)2的值是().  A. 13B. 19C. 25 D. 169  分析:由勾股定理得a2 b2=13,由面积关系得(a-b)2=1,从而建立关于a、b的关系式.  解:由勾股定理,结合题意得a2 b2=