Ceramizable silicone rubber composite tape is a new type of functional material that has attracted much attention in the fields of high temperature protection,power insulation,and special engineering in recent years due to its unique properties.This material combines the flexibility of silicone rubber with the high-temperature resistance of ceramicizable fillers,exhibiting excellent processing performance at room temperature,and can be converted into a ceramic protective layer in high temperature or flame environments,while maintaining structural integrity and functionality.Its mechanical strength and electrical insulation properties,as core performance indicators,directly affect the reliability and service life of materials in practical applications.

 

 

　　From the perspective of mechanical strength,the design of ceramicizable silicone rubber composite tape fully considers the mechanical performance of the material under normal and extreme conditions.At room temperature,the silicone rubber matrix endows the material with good flexibility and tensile properties.Its tensile strength can usually reach 5-10 MPa,and the elongation at break exceeds 300%,which can adapt to the complex shape of the coating requirements.When exposed to high temperature environments,ceramic fillers(such as silicates,borates,etc.)in the material react with the decomposition products of silicone rubber,forming a three-dimensional network structure of ceramic layers in the temperature range of 600-1000℃.This transformation process significantly improves the material's resistance to thermal shock and high-temperature strength.The bending strength of the ceramicized material can reach 15-30MPa,which can effectively resist high-temperature airflow erosion and mechanical stress.It is worth noting that the particle size distribution,interfacial compatibility,and dispersion state of fillers in composite tapes have a decisive impact on their mechanical properties.By optimizing the filler ratio and surface modification techniques,ceramic products can form a dense and uniform microstructure,thereby avoiding crack propagation or structural collapse at high temperatures.

 

　　The electrical insulation performance is another important characteristic of this composite tape.Silicone rubber itself has excellent dielectric properties,with a volume resistivity of up to 10^14-10^15Ω·cm and a dielectric strength exceeding 20kV/mm.In the process of ceramicization,although the matrix material undergoes phase transition,the formed ceramic layer still maintains stable insulation properties.Experimental studies have shown that after high-temperature treatment at 1000℃,the surface resistivity of composite tapes can still be maintained at the level of 10^8-10^9Ω·cm,which can effectively prevent current leakage.This high-temperature insulation characteristic originates from the continuous silicon oxygen network structure formed in the ceramic layer,which not only has a high melting point but also effectively blocks the migration of free charges.In addition,the insulation stability of composite tapes in harsh environments such as wet heat aging and chemical corrosion is significantly better than that of traditional rubber materials,thanks to the hydrophobicity of the silicone rubber matrix and the chemical inertness of the ceramic layer.

 

　　Mechanical strength and electrical insulation exhibit a synergistic enhancement effect in ceramicizable silicone rubber composite tapes.In high-temperature scenarios,the improvement of mechanical strength ensures the integrity of the insulation structure and prevents electrical failures caused by material deformation or damage;The stable electrical insulation performance provides a safety guarantee for materials that can withstand mechanical stress.For example,in the fire protection of power cables,composite tapes can withstand the high temperature impact generated by short-circuit arcs while maintaining the insulation barrier function continuously.This dual protection mechanism is difficult to achieve with traditional materials.The current research focus is shifting towards nanocomposite technology and multi-scale structural design,by introducing reinforcing phases such as silicon carbide whiskers and boron nitride nanosheets,to further enhance the mechanical and dielectric properties of materials.With the continuous optimization of the preparation process,the application prospects of ceramicizable silicone rubber composite tapes in new energy equipment,aerospace and other fields will be even broader.