Optimization of preparation process for AlNBN/silicone rubber composites based on orthogonal experimental design

High voltage and miniaturization are the development trend of X-ray high voltage power supply. The problem of insulation and heat conduction has became the bottleneck of the miniaturization of X-ray high voltage power supply voltage doubling rectifying module. Liquid silicone rubber is widely used in the field of electronic packaging due to its excellent performance. In order to study the influence of preparation process (stirring time, curing time, ratio of silicon to hydrogen and mass ratio of AlN to BN) on the thermal conductivity and insulation properties of AlN-BN/silicone rubber composites, this paper discusses an orthogonal experimental method to solve the optimal process of AlN-BN/silicone rubber composites. In the experiment, vinyl silicone oil, and hydrogen-containing silicone oil were used as the base material, and AlN and BN were used as fillers to study the optimal process of AlN-BN/silicone rubber composites. 16 kinds of AlN-BN/silicone rubber composites samples were prepared by mechanical blending method for testing. The mass fraction is 10%. The test results show that the stirring time and the mass ratio of AlN to BN have significant effects on the volume resistivity, and the mass ratio of AlN to BN factors have a significant effect on thermal conductivity. And determined the optimization process for preparing composite materials. The volume resistivity of the test was 5.32×10
¹⁶
Ω·cm and the thermal conductivity was 0.1919W/(m·K). The experimental results show that when the filler content is increased to 30wt%, the volume resistivity maintains a high growth rate (67%), and the thermal conductivity increases by 38%.