正交试验法优化SiC增强铝基复合材料的制备工艺

采用搅拌铸造法,以SiC颗粒为增强相,制备铝基复合材料。以所得试样的密度和磨损率为目标函数,以搅拌温度(A)、搅拌速度(B)、搅拌时间(C)为变量进行正交优化设计。结果表明,搅拌因素对复合材料密度的影响顺序为:B>C>A;对磨损率的影响顺序为:B>A>C。制备SiC增强铝基复合材料的最佳工艺参数为:搅拌温度780℃,搅拌速度300 r/min,搅拌时间40 min。

Factors Influencing Droplet Size of Silicone Oil Emulsion with High Solid Content

A silicone oil emulsion with 60% of solid content was prepared with methyl silicone oil used as the main material by means of the emulsifier-in-oil method.The influence of emulsification conditions on the droplet diameter of silicone oil emulsion was discussed.The experimental results showed that the emulsification method,including the quantity of the emulsifier,the time and temperature of emulsification,the emulsifying water dosage,and the stirring speed,had significant impact on the droplet size.The optimal conditions were identified to achieve a smallest droplet diameter of the emulsion at an emulsifier dosage of 6%,an emulsification temperature of 70 ℃,an emulsification time of 30 min,and a stirring speed of 1100 r/min,with water added in two portions at a ratio of 1:1.The high-solid content silicone oil emulsion with a mean droplet diameter of 2.731 μm was prepared under these conditions that could ensure absence of stratification and floating oil under centrifuging at a speed of 3000 r/min for 30 min.