Preparation and properties of SiC or Al2O3 particles/rubber composites applied on functionally graded lapping and polishing plate
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摘要: 以SiC或Al2O3磨粒为颗粒增强相,氯丁橡胶(CR)或丙烯酸酯橡胶(ACM)为基体制备了不同种类、不同质量比的磨粒与橡胶共混的颗粒/橡胶复合材料。当SiC与CR质量比小于50∶100时,同一配比多次重复实验,颗粒/橡胶复合材料杨氏模量值波动不明显,标准差最大值为1.09。针对橡胶的黏弹性导致工件与不同颗粒/橡胶复合材料动静态应力不一致的问题,通过振动测试和动态力学分析(DMA),发现在加工所需温度区间20~50℃,SiC/CR或Al2O3/CR复合材料与SiC/ACM复合材料相比,其动静态应力的最大偏差值分别为2.5%和16%,下降幅度明显,且DMA结果显示,SiC/CR或Al2O3/CR复合材料的损耗因子tanδ小于0.3,因此优选CR为梯度功能研磨抛光盘颗粒/橡胶复合材料的基体。Abstract: The SiC or Al2O3 particles/rubber composites were made by the chloroprene rubber (CR) or acrylic rubber (ACM) as the matrix. When the mass ratio of SiC to CR is less than 50:100, the value fluctuation of Young's modulus for particles/rubber composites by repeated tests several times with the same ratio is not obvious, whose maximum standard deviation is 1.09. Aiming at the inconsistent problem of the dynamic and static stress between the workpiece and different particles/rubber composites because of the viscoelasticity of rubber, the vibration test and dynamic mechanical analysis (DMA) were adopted. The results show that in the temperature range of 20-50°C, the maximum deviation of dynamic and static contact stress of SiC/CR or Al2O3/CR composites is 2.5%, which is obviously lower than that of the SiC/ACM composites (16%). DMA results show that the loss factor tanδ of SiC/CR or Al2O3/CR composites is less than 0.3. Therefore, CR is the optimal matrix for particles/rubber composites applied on functionally graded lapping and polishing plate.
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Key words:
- particle reinforcement /
- rubber /
- composites /
- surface properties /
- mechanical properties
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表 1 颗粒/橡胶复合材料样品质量比
Table 1. Mass ratios of particles/rubber composite samples
Sample CR/g ACM/g SiC/g Al2O3/g ZnO/g MgO/g CH3(CH2)16COOH/g NO/g CR 100 0 0 0 5 4 0.4 7.0 20%SiC/CR 100 0 20 0 5 4 0.4 1.6 50%SiC/CR 100 0 50 0 5 4 0.4 0 20%Al2O3/CR 100 0 0 20 5 4 0.4 1.6 50%Al2O3/CR 100 0 0 50 5 4 0.4 0 ACM 0 100 0 0 5 4 0.4 7.0 20%SiC/ACM 0 100 20 0 5 4 0.4 1.6 50%SiC/ACM 0 100 50 0 5 4 0.4 0 Notes: CR—Chloroprene rubber; ACM—Acrylic rubber; NO—Naphthenic oil. 表 2 不同颗粒/橡胶复合材料邵氏硬度测量数据
Table 2. Measured data of shore hardness of different particles/rubber composites
Sample Hardness HA Standard deviation CR 39.4 0.19 50%SiC/CR 89.2 0.77 50%Al2O3/CR 92.8 0.98 ACM 64.5 0.41 50%SiC/ACM 84.2 0.73 -
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